Merge remote-tracking branch 'upstream/master' into dev

.gitattributes

@@ -0,0 +1 @@
+*.xz binary

Makefile

@@ -28,6 +28,7 @@ UNAME := $(shell uname)
 
 ifeq ($(UNAME), Linux)
 LIBS+=-lrt
+CFLAGS+=-std=c11 -D_DEFAULT_SOURCE
 endif
 ifeq ($(UNAME), Darwin)
 # TODO: Putting GCC in C11 mode breaks things.

demod_2400.c

@@ -58,6 +58,7 @@ static inline int slice_phase4(uint16_t *m) {
 //
 void demodulate2400(struct mag_buf *mag)
 {
+    static struct modesMessage zeroMessage;
     struct modesMessage mm;
     unsigned char msg1[MODES_LONG_MSG_BYTES], msg2[MODES_LONG_MSG_BYTES], *msg;
     uint32_t j;
@@ -70,7 +71,6 @@ void demodulate2400(struct mag_buf *mag)
 
     uint64_t sum_scaled_signal_power = 0;
 
-    memset(&mm, 0, sizeof(mm));
     msg = msg1;
 
     for (j = 0; j < mlen; j++) {
@@ -297,6 +297,7 @@ void demodulate2400(struct mag_buf *mag)
         msglen = modesMessageLenByType(bestmsg[0] >> 3);
 
         // Set initial mm structure details
+        mm = zeroMessage;
         mm.timestampMsg = mag->sampleTimestamp + (j*5) + bestphase;
 
         // compute message receive time as block-start-time + difference in the 12MHz clock

dump1090.c

@@ -711,7 +711,7 @@ void showHelp(void) {
 "--stats-every <seconds>  Show and reset stats every <seconds> seconds\n"
 "--onlyaddr               Show only ICAO addresses (testing purposes)\n"
 "--metric                 Use metric units (meters, km/h, ...)\n"
-"--hae                    Show altitudes as HAE (with H suffix) when available\n"
+"--gnss                   Show altitudes as HAE/GNSS (with H suffix) when available\n"
 "--snip <level>           Strip IQ file removing samples < level\n"
 "--debug <flags>          Debug mode (verbose), see README for details\n"
 "--quiet                  Disable output to stdout. Use for daemon applications\n"
@@ -1018,7 +1018,7 @@ int main(int argc, char **argv) {
             Modes.onlyaddr = 1;
         } else if (!strcmp(argv[j],"--metric")) {
             Modes.metric = 1;
-        } else if (!strcmp(argv[j],"--hae")) {
+        } else if (!strcmp(argv[j],"--hae") || !strcmp(argv[j],"--gnss")) {
             Modes.use_hae = 1;
         } else if (!strcmp(argv[j],"--aggressive")) {
 #ifdef ALLOW_AGGRESSIVE

dump1090.h

@@ -167,6 +167,8 @@ typedef struct rtlsdr_dev rtlsdr_dev_t;
 #define MODES_ACFLAGS_LLBOTH_VALID   (MODES_ACFLAGS_LLEVEN_VALID | MODES_ACFLAGS_LLODD_VALID)
 #define MODES_ACFLAGS_AOG_GROUND     (MODES_ACFLAGS_AOG_VALID    | MODES_ACFLAGS_AOG)
 
+#define INVALID_ALTITUDE (-9999)
+
 #define MODES_NON_ICAO_ADDRESS       (1<<24) // Set on addresses to indicate they are not ICAO addresses
 
 #define MODES_DEBUG_DEMOD (1<<0)

mode_ac.c

@@ -39,9 +39,10 @@ int ModeAToModeC(unsigned int ModeA)
   unsigned int FiveHundreds = 0;
   unsigned int OneHundreds  = 0;
 
-  if (  (ModeA & 0xFFFF8889)         // check zero bits are zero, D1 set is illegal
+  if ((ModeA & 0xFFFF8889) != 0 ||         // check zero bits are zero, D1 set is illegal
-    || ((ModeA & 0x000000F0) == 0) ) // C1,,C4 cannot be Zero
+      (ModeA & 0x000000F0) == 0) { // C1,,C4 cannot be Zero
-    {return -9999;}
+      return INVALID_ALTITUDE;
+  }
 
   if (ModeA & 0x0010) {OneHundreds ^= 0x007;} // C1
   if (ModeA & 0x0020) {OneHundreds ^= 0x003;} // C2
@@ -51,8 +52,9 @@ int ModeAToModeC(unsigned int ModeA)
   if ((OneHundreds & 5) == 5) {OneHundreds ^= 2;}
 
   // Check for invalid codes, only 1 to 5 are valid 
-  if (OneHundreds > 5)
+  if (OneHundreds > 5) {
-    {return -9999;} 
+      return INVALID_ALTITUDE;
+  }
 
 //if (ModeA & 0x0001) {FiveHundreds ^= 0x1FF;} // D1 never used for altitude
   if (ModeA & 0x0002) {FiveHundreds ^= 0x0FF;} // D2

mode_s.c

@@ -111,8 +111,6 @@ static int decodeID13Field(int ID13Field) {
     return (hexGillham);
 }
 
-#define INVALID_ALTITUDE (-9999)
-
 //
 //=========================================================================
 //
@@ -355,6 +353,13 @@ int scoreModesMessage(unsigned char *msg, int validbits)
     case 5: // surveillance, altitude reply
     case 16: // long air-air surveillance
     case 24: // Comm-D (ELM)
+    case 25: // Comm-D (ELM)
+    case 26: // Comm-D (ELM)
+    case 27: // Comm-D (ELM)
+    case 28: // Comm-D (ELM)
+    case 29: // Comm-D (ELM)
+    case 30: // Comm-D (ELM)
+    case 31: // Comm-D (ELM)
         return icaoFilterTest(crc) ? 1000 : -1;
 
     case 11: // All-call reply
@@ -462,6 +467,13 @@ int decodeModesMessage(struct modesMessage *mm, unsigned char *msg)
     case 5: // surveillance, altitude reply
     case 16: // long air-air surveillance
     case 24: // Comm-D (ELM)
+    case 25: // Comm-D (ELM)
+    case 26: // Comm-D (ELM)
+    case 27: // Comm-D (ELM)
+    case 28: // Comm-D (ELM)
+    case 29: // Comm-D (ELM)
+    case 30: // Comm-D (ELM)
+    case 31: // Comm-D (ELM)
         // These message types use Address/Parity, i.e. our CRC syndrome is the sender's ICAO address.
         // We can't tell if the CRC is correct or not as we don't know the correct address.
         // Accept the message if it appears to be from a previously-seen aircraft

net_io.c

@@ -716,6 +716,7 @@ static int decodeBinMessage(struct client *c, char *p) {
     int  j;
     char ch;
     unsigned char msg[MODES_LONG_MSG_BYTES];
+    static struct modesMessage zeroMessage;
     struct modesMessage mm;
     MODES_NOTUSED(c);
     memset(&mm, 0, sizeof(mm));
@@ -732,6 +733,8 @@ static int decodeBinMessage(struct client *c, char *p) {
     }
 
     if (msgLen) {
+        mm = zeroMessage;
+
         // Mark messages received over the internet as remote so that we don't try to
         // pass them off as being received by this instance when forwarding them
         mm.remote      =    1;
@@ -810,8 +813,10 @@ static int decodeHexMessage(struct client *c, char *hex) {
     int l = strlen(hex), j;
     unsigned char msg[MODES_LONG_MSG_BYTES];
     struct modesMessage mm;
+    static struct modesMessage zeroMessage;
+
     MODES_NOTUSED(c);
-    memset(&mm, 0, sizeof(mm));
+    mm = zeroMessage;
 
     // Mark messages received over the internet as remote so that we don't try to
     // pass them off as being received by this instance when forwarding them

public_html/index.html

@@ -16,6 +16,7 @@
 		<script type="text/javascript" src="config.js"></script>
 		<script type="text/javascript" src="markers.js"></script>
 		<script type="text/javascript" src="dbloader.js"></script>
+		<script type="text/javascript" src="registrations.js"></script>
 		<script type="text/javascript" src="planeObject.js"></script>
 		<script type="text/javascript" src="formatter.js"></script>
 		<script type="text/javascript" src="flags.js"></script>

public_html/layers.js

@@ -66,6 +66,27 @@ function createBaseLayers() {
                 }
         }
 
+        var nexrad = new ol.layer.Tile({
+                name: 'nexrad',
+                title: 'NEXRAD',
+                type: 'overlay',
+                opacity: 0.5,
+                visible: false
+        });
+        us.push(nexrad);
+
+        var refreshNexrad = function() {
+                // re-build the source to force a refresh of the nexrad tiles
+                var now = new Date().getTime();
+                nexrad.setSource(new ol.source.XYZ({
+                        url : 'http://mesonet{1-3}.agron.iastate.edu/cache/tile.py/1.0.0/nexrad-n0q-900913/{z}/{x}/{y}.png?_=' + now,
+                        attributions: 'NEXRAD courtesy of <a href="http://mesonet.agron.iastate.edu/">IEM</a>'
+                }));
+        };
+
+        refreshNexrad();
+        window.setInterval(refreshNexrad, 5 * 60000);
+
         if (world.length > 0) {
                 layers.push(new ol.layer.Group({
                         name: 'world',

public_html/markers.js

@@ -58,43 +58,194 @@ var _beechcraft_svg =
 var _heavy_svg =
         "m28.64874,12.035023l0,8.801421l-4.585627,3.066495c0.126825,-0.257055 0.094102,-0.531839 0.095802,-0.802796l-0.015437,-3.087446l-2.230453,-0.012673l0.019009,3.599141c0.000513,0.577993 0.076338,0.923195 0.589296,1.241956l-5.533809,3.630512c0.166511,-0.256275 0.153699,-0.551367 0.153699,-0.841892l-0.005929,-3.270195l-2.160751,-0.012672l-0.006337,3.637159c0.016349,0.5301 0.096662,1.090947 0.576623,1.419379l-11.976014,7.825597c-2.106287,1.48859 -1.705322,3.044253 -1.56512,4.587637l26.645047,-9.048544l0,13.750239l0.722364,5.062875l-8.681027,6.387208c-1.239945,1.059417 -1.080616,2.171837 -0.842757,3.256969l11.278998,-2.946479c0.130159,3.116897 1.559821,3.171571 1.780561,0.006336l11.278998,2.94648c0.23786,-1.085133 0.397189,-2.197552 -0.842756,-3.256969l-8.681026,-6.387207l0.722362,-5.062875l0,-13.750239l26.645048,9.042207c0.140203,-1.543381 0.541167,-3.092711 -1.56512,-4.581301l-11.976015,-7.825597c0.47996,-0.328434 0.553938,-0.889279 0.570286,-1.419379l0,-3.63716l-2.160751,0.012673l-0.005378,3.328244c-0.002334,0.294243 0.007077,0.545056 0.178191,0.817583l-5.565189,-3.664251c0.512962,-0.318761 0.59512,-0.663963 0.595633,-1.241956l0.019009,-3.599141l-2.230454,0.012673l-0.015793,3.100403c0.001462,0.282341 -0.019949,0.535579 0.124839,0.794638l-4.614307,-3.071294l0,-8.801421c-1.111672,-11.152869 -5.489391,-11.217579 -6.735717,-0.006336z";
 
-var MarkerIcons = {
+// From https://discussions.flightaware.com/ads-b-flight-tracking-f21/some-custom-svg-plane-icons-t37783.html
-        generic : {
+// by Peter Lowden
-                scale : 0.4,
+// licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/)
+
+// NB: scaled so that 1 pixel is about 1.33m (0.75px = 1m)
+var _a320 = {
+        key: "a320",
+        scale: 0.60 * 0.75,
+        size: [64, 64],
+        anchor: [32, 28],
+        path: "m 32,1 2,1 2,3 0,18 4,1 0,-4 3,0 0,5 17,6 0,3 -15,-2 -9,0 0,12 -2,6 7,3 0,2 -8,-1 -1,2 -1,-2 -8,1 0,-2 7,-3 -2,-6 0,-12 -9,0 -15,2 0,-3 17,-6 0,-5 3,0 0,4 4,-1 0,-18 2,-3 2,-1z"
+};
+
+var _b777 = {
+        key: "b777",
+        scale: 1.15 * 0.75,
         size: [64, 64],
         anchor: [32, 32],
-                path : _generic_plane_svg
+        path: "m 32,1 2,1 1,2 0,20 4,4 0,-4 3,0 0,4 -1,2 17,12 0,2 -16,-5 -7,0 0,13 -1,5 7,5 0,2 -8,-2 -1,2 -1,-2 -8,2 0,-2 7,-5 -1,-5 0,-13 -7,0 -16,5 0,-2 17,-12 -1,-2 0,-4 3,0 0,4 4,-4 0,-20 1,-2 2,-1z"
-        },
+};
 
-        light : {
+var _dash8 = {
-                scale : 0.4,
+        key: "dash8",
+        scale: 0.52 * 0.75,
+        size: [64, 64],
+        anchor: [32, 30],
+        path: "m 32,1 3,4 0,20 4,0 0,-5 1,-1 1,1 0,5 17,2 0,3 -17,2 0,3 -1,1 -1,-1 0,-3 -4,0 0,15 -1,8 6,0 1,1 0,3 -8,0 -1,1 -1,-1 -8,0 0,-3 1,-1 6,0 -1,-8 0,-15 -4,0 0,3, -1,1 -1,-1 0,-3 -17,-2 0,-3 17,-2 0,-5 1,-1 1,1 0,5 4,0 0,-20 3,-4z"
+};
+
+var _b200 = {
+        key: "b200",
+        scale: 0.31 * 0.75,
+        size: [64, 64],
+        anchor: [32, 19],
+        path: "m 32,1 1,0 1,2 1,4 0,5 5,0 0,-5 -1,-1 2,-2 2,2 -1,1 0,5 17,2 0,3 -17,3 0,1 -2,0 0,-1 -5,0 0,5 -2,8 6,3 0,2 -6,-1 -1,0 -6,1 0,-2 6,-3 -2,-8 0,-5 -5,0 0,1, -2,0 0,-1 -17,-3 0,-3 17,-2 0,-5 -1,-1 2,-2 2,2 -1,1 0,5 5,0 0,-5 1,-4 1,-2 z"
+};
+
+var _g650 = {
+        key: "g650",
+        scale: 0.58 * 0.75,
+        size: [64, 64],
+        anchor: [32, 26],
+        path: "m 32,1 1,0 1,2 1,4 0,10 21,17 0,5 -2,-2 -16,-8 -3,0 0,3 2,0 1,1 0,5 -1,1 0,3 -2,0 0,1 7,5 0,3 -9,-3 -1,0 -9,3 0,-3 7,-5 0,-1 -2,0 0,-3 -1,-1 0,-5 1,-1 2,0 0,-3 -3,0 -16,8 -2,2 0,-5 21,-17 0,-10 1,-4 1,-2z"
+};
+
+var _c130 = {
+        key: "c130",
+        scale: 0.75 * 0.75,
+        size: [64, 64],
+        anchor: [32, 17],
+        path: "m 31,1 1,0 1,1 1,2 0,8 3,0 0,-3 1,-1 1,1 0,3 6,0 0,-3 1,-1 1,1 0,3 10,1 0,2 -1,1 -17,3 -5,0 0,10 -1,1 8,2 0,1 -1,1 -8,0 -1,1 -1,-1 -8,0 -1,-1 0,-1 8,-2 -1,-1 0,-10 -5,0 -17,-3 -1,-1 0,-2 10,-1 0,-3 1,-1 1,1 0,3 6,0 0,-3 1,-1 1,1 0,3 3,0 0,-8 1,-2 1,-1 z"
+};
+
+var _balloon = {
+        key: "balloon",
+        scale: 0.50,
+        size: [64, 64],
+        anchor: [32, 32],
+        path: "m 27,1 10,0 3,1 3,1 1,1 2,1 6,6 1,2 1,1 1,3 1,3 0,10 -1,3 -1,3 -1,1 -1,2 -6,6 -2,1 -1,1 -2,1 -2,1 -2,8 -1,0 2,-8 -3,1 -6,0 -3,-1 2,8 9,0 0,6 -10,0 0,-6 -2,-8 -2,-1 -2,-1 -1,-1 -2,-1 -6,-6 -1,-2 -1,-1 -1,-3 -1,-3 0,-10 1,-3 1,-3 1,-1 1,-2 6,-6 2,-1 1,-1 3,-1 3,-1 z",
+        noRotate: true,
+        markerRadius: 32
+};
+
+
+// by Oliver Jowett <oliver@mutability.co.uk>
+// licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/)
+var _a380 = {
+        key: "a380",
+        scale: 1.26 * 0.75,
+        size: [64, 64],
+        anchor: [32, 30],
+        path: "m 32,59 -1,-4 -4,1 -7,3 -1,0 1,-3 1,-1 7,-6 2,-2 -1,-5 0,-9 -1,-2 -2,0 -6,2 -5,2 -5,2 -9,4 0,1 0,-3 1,-2 9,-7 -1,-1 0,-4 1,-1 1,0 1,1 0,3 1,0 5,-4 0,-5 1,-1 1,0 1,1 0,3 6,-5 1,-2 0,-7 1,-5 1,-2 1,-1 1,1 1,2 1,5 0,7 1,2 6,5 0,-3 1,-1 1,0 1,1 0,5 5,4 1,0 0,-3 1,-1 1,0 1,1 0,4 -1,1 9,7 1,2 0,3 0,-1 -9,-4 -5,-2 -5,-2 -6,-2 -2,0 -1,2 0,9 -1,5 2,2 7,6 1,1 1,3 -1,0 -7,-3 -4,-1 -1,4 z"
+};
+
+var _b738 = {
+        key: "b738",
+        scale: 0.63 * 0.75,
+        size: [64, 64],
+        anchor: [32, 32],
+        path: "m 32,61 -1,-1 -9,2 -2,1 0,-2 9,-6 1,-1 -1,-9 0,-11 -7,0 -1,1 0,-1 -3,1 -1,1 0,-1 -3,1 -9,3 -1,1 0,-2 1,-2 17,-9 1,-1 -1,-2 0,-3 1,-1 2,0 1,1 0,3 3,-2 0,-13 1,-5 1,-3 1,-1 1,1 1,3 1,5 0,13 3,2 0,-3 1,-1 2,0 1,1 0,3 -1,2 1,1 17,9 1,2 0,2 -1,-1 -9,-3 -3,-1 0,1 -1,-1 -3,-1 0,1 -1,-1 -7,0 0,11 -1,9 1,1 9,6 0,2 -2,-1 -9,-2 -1,1 z"
+};
+
+var TypeIcons = {
+        'A318': _a320, // shortened a320
+        'A319': _a320, // shortened a320
+        'A320': _a320,
+        'A321': _a320, // stretched a320
+
+        'A388': _a380,
+
+        // dubious since these are old-generation 737s
+        // but the shape is similar
+        'B731': _b738,
+        'B732': _b738,
+        'B733': _b738,
+        'B734': _b738,
+        'B735': _b738,
+
+        // these probably need reworking
+        // since they vary in length
+        'B736': _b738,
+        'B737': _b738,
+        'B738': _b738,
+        'B739': _b738,
+
+        'B772': _b777, // all pretty similar except for length
+        'B77W': _b777,
+        'B773': _b777,
+        'B77L': _b777,
+
+        'DH8A': _dash8,
+        'DH8B': _dash8,
+        'DH8C': _dash8,
+        'DH8D': _dash8,
+
+        'BE20': _b200,
+
+        'GLF5': _g650, // close enough
+        'GLF6': _g650,
+
+        'C130': _c130,
+        'C30J': _c130
+};
+
+var CategoryIcons = {
+        "A1" : {
+                key : "A1",
+                scale : 0.30,
                 size : [64, 64],
                 anchor : [32, 25],
                 path : _beechcraft_svg
         },
 
-        medium : {
+        "A2" : {
-                scale : 0.4,
+                key : "A2",
+                scale : 0.35,
                 size : [64, 64],
                 anchor : [32, 32],
                 path : _generic_plane_svg
         },
 
-        heavy : {
+        "A3" : {
-                scale : 0.6,
+                key : "A3",
+                scale : 0.40,
+                size : [64, 64],
+                anchor : [32, 32],
+                path : _generic_plane_svg
+        },
+
+        "A5" : {
+                key : "A5",
+                scale : 0.73,
                 size : [64, 64],
                 anchor : [32, 32],
                 path : _heavy_svg
         },
 
-        rotorcraft : {
+        "A7" : {
-                scale : 0.5,
+                key : "A7",
+                scale : 0.50,
                 size : [64, 64],
                 anchor : [22, 32],
                 path : _rotorcraft_svg
-        }
+        },
+
+        "B2" : _balloon
 };
 
+var DefaultIcon = {
+        key : "default",
+        scale : 0.4,
+        size : [64, 64],
+        anchor : [32, 32],
+        path : _generic_plane_svg
+};
+
+function getBaseMarker(category, type) {
+        if (type in TypeIcons) {
+                return TypeIcons[type];
+        }
+
+        if (category in CategoryIcons) {
+                return CategoryIcons[category];
+        }
+
+        return DefaultIcon;
+}
+
 function svgPathToSvg(path, size, stroke, width, fill) {
         var svg = '<svg width="' + size[0] + 'px" height="' + size[1] + 'px" version="1.1" xmlns="http://www.w3.org/2000/svg">';
         svg += '<path d="' + path + '"';

public_html/planeObject.js

@@ -39,12 +39,17 @@ function PlaneObject(icao) {
         this.marker = null;
         this.markerStyle = null;
         this.markerIcon = null;
+        this.markerStaticStyle = null;
+        this.markerStaticIcon = null;
         this.markerStyleKey = null;
         this.markerSvgKey = null;
 
-        // request metadata
+        // start from a computed registration, let the DB override it
-        this.registration = null;
+        // if it has something else.
+        this.registration = registration_from_hexid(this.icao);
         this.icaotype = null;
+
+        // request metadata
         getAircraftData(this.icao).done(function(data) {
                 if ("r" in data) {
                         this.registration = data.r;
@@ -178,22 +183,6 @@ PlaneObject.prototype.clearLines = function() {
         }
 };
 
-PlaneObject.prototype.getMarkerIconType = function() {
-        var lookup = {
-                'A1' : 'light',
-                'A2' : 'medium',
-                'A3' : 'medium',
-                'A5' : 'heavy',
-                'A7' : 'rotorcraft'
-
-        };
-
-        if (this.category === null || !(this.category in lookup))
-                return 'generic'
-        else
-                return lookup[this.category];
-}
-
 PlaneObject.prototype.getMarkerColor = function() {
         // Emergency squawks override everything else
         if (this.squawk in SpecialSquawks)
@@ -269,35 +258,71 @@ PlaneObject.prototype.updateIcon = function() {
         var col = this.getMarkerColor();
         var opacity = (this.position_from_mlat ? 0.75 : 1.0);
         var outline = (this.position_from_mlat ? OutlineMlatColor : OutlineADSBColor);
-        var type = this.getMarkerIconType();
+        var baseMarker = getBaseMarker(this.category, this.icaotype);
-        var weight = ((this.selected ? 2 : 1) / MarkerIcons[type].scale).toFixed(1);
+        var weight = ((this.selected ? 2 : 1) / baseMarker.scale).toFixed(1);
         var rotation = (this.track === null ? 0 : this.track);
 
-        var svgKey = col + '!' + outline + '!' + type + '!' + weight;
+        var svgKey = col + '!' + outline + '!' + baseMarker.key + '!' + weight;
         var styleKey = opacity + '!' + rotation;
 
         if (this.markerStyle === null || this.markerIcon === null || this.markerSvgKey != svgKey) {
                 //console.log(this.icao + " new icon and style " + this.markerSvgKey + " -> " + svgKey);
 
-                this.markerIcon = new ol.style.Icon({
+                var icon = new ol.style.Icon({
-                        anchor: MarkerIcons[type].anchor,
+                        anchor: baseMarker.anchor,
                         anchorXUnits: 'pixels',
                         anchorYUnits: 'pixels',
-                        scale: MarkerIcons[type].scale,
+                        scale: baseMarker.scale,
-                        imgSize: MarkerIcons[type].size,
+                        imgSize: baseMarker.size,
-                        src: svgPathToURI(MarkerIcons[type].path, MarkerIcons[type].size, outline, weight, col),
+                        src: svgPathToURI(baseMarker.path, baseMarker.size, outline, weight, col),
-                        rotation: rotation * Math.PI / 180.0,
+                        rotation: (baseMarker.noRotate ? 0 : rotation * Math.PI / 180.0),
-                        opacity: opacity
+                        opacity: opacity,
+                        rotateWithView: (baseMarker.noRotate ? false : true)
                 });
 
-                this.markerStyleKey = styleKey;
+                if (baseMarker.noRotate) {
-                this.markerSvgKey = svgKey;
+                        // the base marker won't be rotated
+                        this.markerStaticIcon = icon;
+                        this.markerStaticStyle = new ol.style.Style({
+                                image: this.markerStaticIcon
+                        });
+
+                        // create an arrow that we will rotate around the base marker
+                        // to indicate heading
+
+                        var offset = baseMarker.markerRadius * baseMarker.scale + 6;
+                        var size = offset * 2;
+
+                        var arrowPath = "M " + offset + ",0 m 4,4 -8,0 4,-4 z";
+                        this.markerIcon = new ol.style.Icon({
+                                anchor: [offset, offset],
+                                anchorXUnits: 'pixels',
+                                anchorYUnits: 'pixels',
+                                scale: 1.0,
+                                imgSize: [size, size],
+                                src: svgPathToURI(arrowPath, [size, size], outline, 1, outline),
+                                rotation: rotation * Math.PI / 180.0,
+                                opacity: opacity,
+                                rotateWithView: true
+                        });
                         this.markerStyle = new ol.style.Style({
                                 image: this.markerIcon
                         });
+                } else {
+                        this.markerIcon = icon;
+                        this.markerStyle = new ol.style.Style({
+                                image: this.markerIcon
+                        });
+                        this.markerStaticIcon = null;
+                        this.markerStaticStyle = new ol.style.Style({});
+                }
+
+                this.markerStyleKey = styleKey;
+                this.markerSvgKey = svgKey;
 
                 if (this.marker !== null) {
                         this.marker.setStyle(this.markerStyle);
+                        this.markerStatic.setStyle(this.markerStaticStyle);
                 }
         }
 
@@ -305,6 +330,9 @@ PlaneObject.prototype.updateIcon = function() {
                 //console.log(this.icao + " new rotation");
                 this.markerIcon.setRotation(rotation * Math.PI / 180.0);
                 this.markerIcon.setOpacity(opacity);
+                if (this.staticIcon) {
+                        this.staticIcon.setOpacity(opacity);
+                }
                 this.markerStyleKey = styleKey;
         }
 
@@ -385,8 +413,9 @@ PlaneObject.prototype.updateTick = function(receiver_timestamp, last_timestamp)
 PlaneObject.prototype.clearMarker = function() {
 	if (this.marker) {
                 PlaneIconFeatures.remove(this.marker);
+                PlaneIconFeatures.remove(this.markerStatic);
                 /* FIXME google.maps.event.clearListeners(this.marker, 'click'); */
-		this.marker = null;
+                this.marker = this.markerStatic = null;
 	}
 };
 
@@ -401,12 +430,18 @@ PlaneObject.prototype.updateMarker = function(moved) {
         if (this.marker) {
                 if (moved) {
                         this.marker.setGeometry(new ol.geom.Point(ol.proj.fromLonLat(this.position)));
+                        this.markerStatic.setGeometry(new ol.geom.Point(ol.proj.fromLonLat(this.position)));
                 }
         } else {
                 this.marker = new ol.Feature(new ol.geom.Point(ol.proj.fromLonLat(this.position)));
                 this.marker.hex = this.icao;
                 this.marker.setStyle(this.markerStyle);
                 PlaneIconFeatures.push(this.marker);
+
+                this.markerStatic = new ol.Feature(new ol.geom.Point(ol.proj.fromLonLat(this.position)));
+                this.markerStatic.hex = this.icao;
+                this.markerStatic.setStyle(this.markerStaticStyle);
+                PlaneIconFeatures.push(this.markerStatic);
 	}
 };
 

public_html/registrations.js

@@ -0,0 +1,315 @@
+// Various reverse-engineered versions of the allocation algorithms
+// used by different countries to allocate 24-bit ICAO addresses based
+// on the aircraft registration.
+//
+// These were worked out by looking at the allocation patterns and
+// working backwards to an algorithm that generates that pattern,
+// spot-checking aircraft to see if it worked.
+// YMMV.
+
+registration_from_hexid = (function () {
+        // hide the guts in a closure
+
+        var limited_alphabet = "ABCDEFGHJKLMNPQRSTUVWXYZ"; // 24 chars; no I, O
+        var full_alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";  // 26 chars
+
+        // handles 3-letter suffixes assigned with a regular pattern
+        //
+        // start: first hexid of range
+        // s1: major stride (interval between different first letters)
+        // s2: minor stride (interval between different second letters)
+        // prefix: the registration prefix
+        //
+        // optionally:
+        //   alphabet: the alphabet to use (defaults full_alphabet)
+        //   first: the suffix to use at the start of the range (default: AAA)
+        //   last: the last valid suffix in the range (default: ZZZ)
+
+        var stride_mappings = [
+                { start: 0x008011, s1: 26*26, s2: 26, prefix: "ZS-" },
+
+                { start: 0x390000, s1: 1024, s2:  32, prefix: "F-G" },
+                { start: 0x398000, s1: 1024, s2:  32, prefix: "F-H" },
+
+                { start: 0x3C4421, s1: 1024,  s2: 32, prefix: "D-A", first: 'AAA', last: 'OZZ' },
+                { start: 0x3C0001, s1: 26*26, s2: 26, prefix: "D-A", first: 'PAA', last: 'ZZZ' },
+                { start: 0x3C8421, s1: 1024,  s2: 32, prefix: "D-B", first: 'AAA', last: 'OZZ' },
+                { start: 0x3C2001, s1: 26*26, s2: 26, prefix: "D-B", first: 'PAA', last: 'ZZZ' },
+                { start: 0x3CC000, s1: 26*26, s2: 26, prefix: "D-C" },
+                { start: 0x3D04A8, s1: 26*26, s2: 26, prefix: "D-E" },
+                { start: 0x3D4950, s1: 26*26, s2: 26, prefix: "D-F" },
+                { start: 0x3D8DF8, s1: 26*26, s2: 26, prefix: "D-G" },
+                { start: 0x3DD2A0, s1: 26*26, s2: 26, prefix: "D-H" },
+                { start: 0x3E1748, s1: 26*26, s2: 26, prefix: "D-I" },
+
+                { start: 0x448421, s1: 1024,  s2: 32, prefix: "OO-" },
+                { start: 0x458421, s1: 1024,  s2: 32, prefix: "OY-" },
+                { start: 0x460000, s1: 26*26, s2: 26, prefix: "OH-" },
+                { start: 0x468421, s1: 1024,  s2: 32, prefix: "SX-" },
+                { start: 0x490421, s1: 1024,  s2: 32, prefix: "CS-" },
+                { start: 0x4A0421, s1: 1024,  s2: 32, prefix: "YR-" },
+                { start: 0x4B8421, s1: 1024,  s2: 32, prefix: "TC-" },
+                { start: 0x740421, s1: 1024,  s2: 32, prefix: "JY-" },
+                { start: 0x760421, s1: 1024,  s2: 32, prefix: "AP-" },
+                { start: 0x768421, s1: 1024,  s2: 32, prefix: "9V-" },
+                { start: 0x778421, s1: 1024,  s2: 32, prefix: "YK-" },
+                { start: 0xC00001, s1: 26*26, s2: 26, prefix: "C-F" },
+                { start: 0xC044A9, s1: 26*26, s2: 26, prefix: "C-G" },
+                { start: 0xE01041, s1: 4096,  s2: 64, prefix: "LV-" }
+        ];
+
+        // numeric registrations
+        //  start: start hexid in range
+        //  first: first numeric registration
+        //  count: number of numeric registrations
+        //  template: registration template, trailing characters are replaced with the numeric registration
+        var numeric_mappings = [
+                { start: 0x140000, first: 0,    count: 100000, template: "RA-00000" },
+                { start: 0x0B03E8, first: 1000, count: 1000,   template: "CU-T0000" }
+        ];
+
+        // fill in some derived data
+        for (var i = 0; i < stride_mappings.length; ++i) {
+                var mapping = stride_mappings[i];
+
+                if (!mapping.alphabet) {
+                        mapping.alphabet = full_alphabet;
+                }
+
+                if (mapping.first) {
+                        var c1 = mapping.alphabet.indexOf(mapping.first.charAt(0));
+                        var c2 = mapping.alphabet.indexOf(mapping.first.charAt(1));
+                        var c3 = mapping.alphabet.indexOf(mapping.first.charAt(2));
+                        mapping.offset = c1 * mapping.s1 + c2 * mapping.s2 + c3;
+                } else {
+                        mapping.offset = 0;
+                }
+
+                if (mapping.last) {
+                        var c1 = mapping.alphabet.indexOf(mapping.last.charAt(0));
+                        var c2 = mapping.alphabet.indexOf(mapping.last.charAt(1));
+                        var c3 = mapping.alphabet.indexOf(mapping.last.charAt(2));
+                        mapping.end = mapping.start - mapping.offset +
+                                c1 * mapping.s1 +
+                                c2 * mapping.s2 +
+                                c3 - mapping.offset;
+                } else {
+                        mapping.end = mapping.start - mapping.offset +
+                                (mapping.alphabet.length - 1) * mapping.s1 +
+                                (mapping.alphabet.length - 1) * mapping.s2 +
+                                (mapping.alphabet.length - 1);
+                }
+        }
+
+        for (var i = 0; i < numeric_mappings.length; ++i) {
+                numeric_mappings[i].end = numeric_mappings[i].start + numeric_mappings[i].count - 1;
+        }
+
+        function lookup(hexid) {
+                var hexid = +("0x" + hexid);
+
+                reg = n_reg(hexid);
+                if (reg)
+                        return reg;
+
+                reg = ja_reg(hexid);
+                if (reg)
+                        return reg;
+
+                reg = hl_reg(hexid);
+                if (reg)
+                        return reg;
+
+                reg = numeric_reg(hexid);
+                if (reg)
+                        return reg;
+
+                reg = stride_reg(hexid);
+                if (reg)
+                        return reg;
+
+                return null;
+        }
+
+        function stride_reg(hexid) {
+                // try the mappings in stride_mappings
+                var i;
+                for (i = 0; i < stride_mappings.length; ++i) {
+                        var mapping = stride_mappings[i];
+                        if (hexid < mapping.start || hexid > mapping.end)
+                                continue;
+
+                        var offset = hexid - mapping.start + mapping.offset;
+
+                        var i1 = Math.floor(offset / mapping.s1);
+                        offset = offset % mapping.s1;
+                        var i2 = Math.floor(offset / mapping.s2);
+                        offset = offset % mapping.s2;
+                        var i3 = offset;
+
+                        if (i1 < 0 || i1 >= mapping.alphabet.length ||
+                            i2 < 0 || i2 >= mapping.alphabet.length ||
+                            i3 < 0 || i3 >= mapping.alphabet.length)
+                                continue;
+
+                        return mapping.prefix + mapping.alphabet.charAt(i1) + mapping.alphabet.charAt(i2) + mapping.alphabet.charAt(i3);
+                }
+
+                // nothing
+                return null;
+        }
+
+        function numeric_reg(hexid) {
+                // try the mappings in numeric_mappings
+                var i;
+                for (i = 0; i < numeric_mappings.length; ++i) {
+                        var mapping = numeric_mappings[i];
+                        if (hexid < mapping.start || hexid > mapping.end)
+                                continue;
+
+                        var reg = (hexid - mapping.start + mapping.first) + "";
+                        return mapping.template.substring(0, mapping.template.length - reg.length) + reg;
+                }
+        }
+
+        //
+        // US N-numbers
+        //
+
+        function n_letters(rem) {
+                if (rem == 0)
+                        return "";
+
+                --rem;
+                return limited_alphabet.charAt(Math.floor(rem / 25)) + n_letter(rem % 25);
+        }
+
+        function n_letter(rem) {
+                if (rem == 0)
+                        return "";
+
+                --rem;
+                return limited_alphabet.charAt(rem);
+        }
+
+        function n_reg(hexid) {
+                var offset = hexid - 0xA00001;
+                if (offset < 0 || offset >= 915399) {
+                        return null;
+                }
+
+                var digit1 = Math.floor(offset / 101711) + 1;
+                var reg = "N" + digit1;
+                offset = offset % 101711;
+                if (offset <= 600) {
+                        // Na, NaA .. NaZ, NaAA .. NaZZ
+                        return reg + n_letters(offset);
+                }
+
+                // Na0* .. Na9*
+                offset -= 601;
+
+                var digit2 = Math.floor(offset / 10111);
+                reg += digit2;
+                offset = offset % 10111;
+
+                if (offset <= 600) {
+                        // Nab, NabA..NabZ, NabAA..NabZZ
+                        return reg + n_letters(offset);
+                }
+
+                // Nab0* .. Nab9*
+                offset -= 601;
+
+                var digit3 = Math.floor(offset / 951);
+                reg += digit3;
+                offset = offset % 951;
+
+                if (offset <= 600) {
+                        // Nabc, NabcA .. NabcZ, NabcAA .. NabcZZ
+                        return reg + n_letters(offset);
+                }
+
+                // Nabc0* .. Nabc9*
+                offset -= 601;
+
+                var digit4 = Math.floor(offset / 35);
+                reg += digit4.toFixed(0);
+                offset = offset % 35;
+
+                if (offset <= 24) {
+                        // Nabcd, NabcdA .. NabcdZ
+                        return reg + n_letter(offset);
+                }
+
+                // Nabcd0 .. Nabcd9
+                offset -= 25;
+                return reg + offset.toFixed(0);
+        }
+
+        // South Korea
+        function hl_reg(hexid) {
+                if (hexid >= 0x71BA00 && hexid <= 0x71bf99) {
+                        return "HL" + (hexid - 0x71BA00 + 0x7200).toString(16);
+                }
+
+                if (hexid >= 0x71C000 && hexid <= 0x71C099) {
+                        return "HL" + (hexid - 0x71C000 + 0x8000).toString(16);
+                }
+
+                if (hexid >= 0x71C200 && hexid <= 0x71C299) {
+                        return "HL" + (hexid - 0x71C200 + 0x8200).toString(16);
+                }
+
+                return null;
+        }
+
+        // Japan
+        function ja_reg(hexid) {
+                var offset = hexid - 0x840000;
+                if (offset < 0 || offset >= 229840)
+                        return null;
+
+                var reg = "JA";
+
+                var digit1 = Math.floor(offset / 22984);
+                if (digit1 < 0 || digit1 > 9)
+                        return null;
+                reg += digit1;
+                offset = offset % 22984;
+
+                var digit2 = Math.floor(offset / 916);
+                if (digit2 < 0 || digit2 > 9)
+                        return null;
+                reg += digit2;
+                offset = offset % 916;
+
+                if (offset < 340) {
+                        // 3rd is a digit, 4th is a digit or letter
+                        var digit3 = Math.floor(offset / 34);
+                        reg += digit3;
+                        offset = offset % 34;
+
+                        if (offset < 10) {
+                                // 4th is a digit
+                                return reg + offset;
+                        }
+
+                        // 4th is a letter
+                        offset -= 10;
+                        return reg + limited_alphabet.charAt(offset);
+                }
+
+                // 3rd and 4th are letters
+                offset -= 340;
+                var letter3 = Math.floor(offset / 24);
+                return reg + limited_alphabet.charAt(letter3) + limited_alphabet.charAt(offset % 24);
+        }
+
+        return lookup;
+})();
+
+// make nodejs happy:
+if (typeof module !== 'undefined') {
+        module.exports = registration_from_hexid;
+}

public_html/script.js

@@ -369,12 +369,48 @@ function initialize_map() {
         // Initialize OL3
 
         var layers = createBaseLayers();
+
+        var iconsLayer = new ol.layer.Vector({
+                name: 'ac_positions',
+                type: 'overlay',
+                title: 'Aircraft positions',
+                source: new ol.source.Vector({
+                        features: PlaneIconFeatures,
+                })
+        });
+
+        layers.push(new ol.layer.Group({
+                title: 'Overlays',
+                layers: [
+                        new ol.layer.Vector({
+                                name: 'site_pos',
+                                type: 'overlay',
+                                title: 'Site position and range rings',
+                                source: new ol.source.Vector({
+                                        features: StaticFeatures,
+                                })
+                        }),
+
+                        new ol.layer.Vector({
+                                name: 'ac_trail',
+                                type: 'overlay',
+                                title: 'Selected aircraft trail',
+                                source: new ol.source.Vector({
+                                        features: PlaneTrailFeatures,
+                                })
+                        }),
+
+                        iconsLayer
+                ]
+        }));
+
         var foundType = false;
 
         ol.control.LayerSwitcher.forEachRecursive(layers, function(lyr) {
-                if (lyr.get('type') !== 'base')
+                if (!lyr.get('name'))
                         return;
 
+                if (lyr.get('type') === 'base') {
                         if (MapType === lyr.get('name')) {
                                 foundType = true;
                                 lyr.setVisible(true);
@@ -387,6 +423,17 @@ function initialize_map() {
                                         MapType = localStorage['MapType'] = evt.target.get('name');
                                 }
                         });
+                } else if (lyr.get('type') === 'overlay') {
+                        var visible = localStorage['layer_' + lyr.get('name')];
+                        if (visible != undefined) {
+                                // javascript, why must you taunt me with gratuitous type problems
+                                lyr.setVisible(visible === "true");
+                        }
+
+                        lyr.on('change:visible', function(evt) {
+                                localStorage['layer_' + evt.target.get('name')] = evt.target.getVisible();
+                        });
+                }
         })
 
         if (!foundType) {
@@ -400,34 +447,6 @@ function initialize_map() {
                 });
         }
 
-        var iconsLayer = new ol.layer.Vector({
-                title: 'Aircraft positions',
-                source: new ol.source.Vector({
-                        features: PlaneIconFeatures,
-                })
-        });
-
-        layers.push(new ol.layer.Group({
-                title: 'Overlays',
-                layers: [
-                        new ol.layer.Vector({
-                                title: 'Site position and range rings',
-                                source: new ol.source.Vector({
-                                        features: StaticFeatures,
-                                })
-                        }),
-
-                        new ol.layer.Vector({
-                                title: 'Selected aircraft trail',
-                                source: new ol.source.Vector({
-                                        features: PlaneTrailFeatures,
-                                })
-                        }),
-
-                        iconsLayer
-                ]
-        }));
-
         OLMap = new ol.Map({
                 target: 'map_canvas',
                 layers: layers,

tools/README.aircraft-db

@@ -0,0 +1,40 @@
+The dump1090 webmap uses a static database of json files to provide aircraft
+information.
+
+This directory has some tools to turn a CSV file with aircraft data into
+the json format that the dump1090 map expects.
+
+The default data comes from a database kindly provided by VRS (unfortunately
+no longer updated). This data is in vrs.csv. It was extracted by:
+
+  $ wget http://www.virtualradarserver.co.uk/Files/BasicAircraftLookup.sqb.gz
+  $ gunzip BasicAircraftLookup.sqb.gz
+  $ tools/vrs-to-csv.py BasicAircraftLookup.sqb >tools/vrs.csv
+
+You can modify vrs.csv (or build a new CSV entirely) and update the database.
+
+First, as an optional step, you can prune out all registrations which match
+what the in-browser hexid-to-registration logic would generate anyway. This
+requires nodejs, see the comments in filter-regs.js
+
+  $ nodejs tools/filter-regs.js <tools/vrs.csv >tools/vrs-pruned.csv
+
+Next, turn the pruned CSV into a set of json files:
+
+  $ tools/csv-to-json.py tools/vrs-pruned.csv public_html/db
+
+The contents of public_html/db should be installed where the webmap can find
+them; the Debian packaging puts these in
+/usr/share/dump1090-mutability/html/db
+
+The CSV format is very simple. The first line must be a header line that names
+the columns. These columns are understood:
+
+ icao24: the 6-digit hex address of the aircraft
+ r: the registration / tail number of the aircraft
+ t: the ICAO aircraft type of the aircraft, e.g. B773
+
+Any other columns are put into the json DB under the name you give them, but
+the standard map code won't do anything special with them. You can pick these
+columns up in the PlaneObject constructor (see planeObject.js where it calls
+getAircraftData()) for later use.

tools/csv-to-json.py

@@ -5,28 +5,40 @@
 # into a bunch of json files suitable for use by the webmap
 #
 
-import sqlite3, json, sys
+import sqlite3, json, sys, csv
 from contextlib import closing
 
-def extract(dbfile, todir, blocklimit, debug):
+def readcsv(name, infile, blocks):
-    ac_count = 0
+    print >>sys.stderr, 'Reading from', name
-    block_count = 0
 
-    blocks = {}
+    if len(blocks) == 0:
         for i in xrange(16):
             blocks['%01X' % i] = {}
 
-    print >>sys.stderr, 'Reading', dbfile
+    ac_count = 0
-    with closing(sqlite3.connect(dbfile)) as db:
+
-        with closing(db.execute('SELECT a.Icao, a.Registration, m.Icao FROM Aircraft a, Model m WHERE a.ModelID = m.ModelID')) as c:
+    reader = csv.DictReader(infile)
-            for icao24, reg, icaotype in c:
+    if not 'icao24' in reader.fieldnames:
+        raise RuntimeError('CSV should have at least an "icao24" column')
+    for row in reader:
+        icao24 = row['icao24']
+
+        entry = {}
+        for k,v in row.items():
+            if k != 'icao24' and v != '':
+                entry[k] = v
+
+        if len(entry) > 0:
+            ac_count += 1
+
             bkey = icao24[0:1].upper()
             dkey = icao24[1:].upper()
-                blocks[bkey][dkey] = {}
+            blocks[bkey].setdefault(dkey, {}).update(entry)
-                if reg: blocks[bkey][dkey]['r'] = reg
+
-                if icaotype: blocks[bkey][dkey]['t'] = icaotype
+    print >>sys.stderr, 'Read', ac_count, 'aircraft from', name
-                ac_count += 1
+
-    print >>sys.stderr, 'Read', ac_count, 'aircraft'
+def writedb(blocks, todir, blocklimit, debug):
+    block_count = 0
 
     print >>sys.stderr, 'Writing blocks:',
 
@@ -83,8 +95,20 @@ def extract(dbfile, todir, blocklimit, debug):
 
 if __name__ == '__main__':
     if len(sys.argv) < 3:
-        print >>sys.stderr, 'Syntax: %s <path to BasicAircraftLookup.sqb> <path to DB dir>' % sys.argv[0]
+        print >>sys.stderr, 'Reads a CSV file with aircraft information and produces a directory of JSON files'
+        print >>sys.stderr, 'Syntax: %s <path to CSV> [... additional CSV files ...] <path to DB dir>' % sys.argv[0]
+        print >>sys.stderr, 'Use "-" as the CSV path to read from stdin'
+        print >>sys.stderr, 'If multiple CSV files are specified and they provide conflicting data'
+        print >>sys.stderr, 'then the data from the last-listed CSV file is used'
         sys.exit(1)
+
+    blocks = {}
+    for filename in sys.argv[1:-1]:
+        if filename == '-':
+            readcsv('stdin', sys.stdin, blocks)
         else:
-        extract(sys.argv[1], sys.argv[2], 1000, False)
+            with closing(open(filename, 'r')) as infile:
+                readcsv(filename, infile, blocks)
+
+    writedb(blocks, sys.argv[-1], 1000, False)
     sys.exit(0)

tools/filter-regs.js

@@ -0,0 +1,38 @@
+//
+// This script processes a CSV file that contains
+// ICAO addresses (column 'icao24') and registrations
+// (column 'r')
+//
+// It removes all registration entries that exactly match
+// what dump1090 would have computed from the hexid anyway,
+// reducing the size of the CSV in the cases where the
+// two approaches match.
+//
+// Any additional columns are passed through unchanged.
+//
+// To run it:
+//
+//   sudo apt-get install nodejs
+//   sudo apt-get install npm
+//   npm install csv     # must be done in the same dir as this script
+//   nodejs filter-regs.js <input.csv >output.csv
+
+var reglookup = require('../public_html/registrations.js');
+var csv = require('csv');
+
+var parser = csv.parse({columns: true});
+var writer = csv.stringify({header: true});
+var transformer = csv.transform(function (record, callback) {
+        if (('icao24' in record) && ('r' in record)) {
+                var computed = reglookup(record.icao24);
+                if (computed === record.r) {
+                        record.r = '';
+                } else if (computed !== null) {
+                        console.warn(record.icao24 + " computed " + computed + " but CSV data had " + record.r);
+                }
+        }
+
+        callback(null, record);
+});
+
+process.stdin.pipe(parser).pipe(transformer).pipe(writer).pipe(process.stdout);

tools/vrs-to-csv.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python2
+
+#
+# Converts a Virtual Radar Server BasicAircraftLookup.sqb database
+# to a CSV file suitable for feeding to csv-to-json.py
+#
+
+import sqlite3, csv, sys
+from contextlib import closing
+
+def extract(dbfile):
+    writer = csv.DictWriter(sys.stdout,
+                            fieldnames=['icao24', 'r', 't'])
+    writer.writeheader()
+    with closing(sqlite3.connect(dbfile)) as db:
+        with closing(db.execute('SELECT a.Icao, a.Registration, m.Icao FROM Aircraft a, Model m WHERE a.ModelID = m.ModelID')) as c:
+            for icao24, reg, icaotype in c:
+                writer.writerow({
+                    'icao24': icao24,
+                    'r': reg,
+                    't': icaotype
+                })
+
+if __name__ == '__main__':
+    if len(sys.argv) < 2:
+        print >>sys.stderr, 'Reads a VRS sqlite database and writes a CSV to stdout'
+        print >>sys.stderr, 'Syntax: %s <path to BasicAircraftLookup.sqb>' % sys.argv[0]
+        sys.exit(1)
+    else:
+        extract(sys.argv[1])
+        sys.exit(0)

track.c

@@ -112,16 +112,24 @@ struct aircraft *trackFindAircraft(uint32_t addr) {
 // (but we don't use it in situations where that matters)
 static double greatcircle(double lat0, double lon0, double lat1, double lon1)
 {
+    double dlat, dlon;
+
     lat0 = lat0 * M_PI / 180.0;
     lon0 = lon0 * M_PI / 180.0;
     lat1 = lat1 * M_PI / 180.0;
     lon1 = lon1 * M_PI / 180.0;
 
-    // avoid NaN
+    dlat = fabs(lat1 - lat0);
-    if (fabs(lat0 - lat1) < 0.0001 && fabs(lon0 - lon1) < 0.0001)
+    dlon = fabs(lon1 - lon0);
-        return 0.0;
 
-    return 6371e3 * acos(sin(lat0) * sin(lat1) + cos(lat0) * cos(lat1) * cos(fabs(lon0 - lon1)));
+    // use haversine for small distances for better numerical stability
+    if (dlat < 0.001 && dlon < 0.001) {
+        double a = sin(dlat/2) * sin(dlat/2) + cos(lat0) * cos(lat1) * sin(dlon/2) * sin(dlon/2);
+        return 6371e3 * 2 * atan2(sqrt(a), sqrt(1.0 - a));
+    }
+
+    // spherical law of cosines
+    return 6371e3 * acos(sin(lat0) * sin(lat1) + cos(lat0) * cos(lat1) * cos(dlon));
 }
 
 static void update_range_histogram(double lat, double lon)
@@ -293,6 +301,8 @@ static int doLocalCPR(struct aircraft *a, struct modesMessage *mm, uint64_t now,
 
         if (a->pos_nuc < *nuc)
             *nuc = a->pos_nuc;
+
+        range_limit = 50e3;
     } else if (!surface && (Modes.bUserFlags & MODES_USER_LATLON_VALID)) {
         reflat = Modes.fUserLat;
         reflon = Modes.fUserLon;
@@ -306,7 +316,9 @@ static int doLocalCPR(struct aircraft *a, struct modesMessage *mm, uint64_t now,
         // at 200NM distance, this may resolve to a position
         // at (200-360) = 160NM in the wrong direction)
 
-        if (Modes.maxRange <= 1852*180) {
+        if (Modes.maxRange == 0) {
+            return (-1); // Can't do receiver-centered checks at all
+        } else if (Modes.maxRange <= 1852*180) {
             range_limit = Modes.maxRange;
         } else if (Modes.maxRange < 1852*360) {
             range_limit = (1852*360) - Modes.maxRange;

view1090.c

@@ -69,6 +69,7 @@ void view1090InitConfig(void) {
     Modes.interactive_rows        = getTermRows();
     Modes.interactive_display_ttl = MODES_INTERACTIVE_DISPLAY_TTL;
     Modes.interactive             = 1;
+    Modes.maxRange                = 1852 * 300; // 300NM default max range
 }
 //
 //=========================================================================
@@ -130,6 +131,7 @@ void showHelp(void) {
   "--net-bo-port <port>     TCP Beast output listen port (default: 30005)\n"
   "--lat <latitude>         Reference/receiver latitide for surface posn (opt)\n"
   "--lon <longitude>        Reference/receiver longitude for surface posn (opt)\n"
+  "--max-range <distance>   Absolute maximum range for position decoding (in nm, default: 300)\n"
   "--no-crc-check           Disable messages with broken CRC (discouraged)\n"
   "--no-fix                 Disable single-bits error correction using CRC\n"
   "--fix                    Enable single-bits error correction using CRC\n"
@@ -192,6 +194,8 @@ int main(int argc, char **argv) {
             Modes.nfix_crc = 0;
         } else if (!strcmp(argv[j],"--aggressive")) {
             Modes.nfix_crc = MODES_MAX_BITERRORS;
+        } else if (!strcmp(argv[j],"--max-range") && more) {
+            Modes.maxRange = atof(argv[++j]) * 1852.0; // convert to metres
         } else if (!strcmp(argv[j],"--help")) {
             showHelp();
             exit(0);