public override bool process(string url, string filename, string source)
{
bool ret = true;
LibSys.StatusBar.Trace("IP: FileNmeaLog:process() filename=" + filename);
int wpCount = 0;
int lineno = 0;
int packetsCount = 0;
Cursor.Current = Cursors.WaitCursor;
try
{
string line;
double zoneShift = 0.0d;
NmeaPacketReceived packetIn = null;
CreateInfo createInfo = new CreateInfo(); // we will recycle it in place, filling every time.
double lat = 0.0d;
double lng = 0.0d;
// we allow elev and dateTime to stay in the cycle and be promoted/inherited to points that do not have this data in NMEA sentence.
double elev = 0.0d; // alt above mean sea level
DateTime dateTime = DateTime.Now;
StreamReader stream = new StreamReader(filename);
while ((line = stream.ReadLine()) != null)
{
lineno++;
// we are in a VERY long cycle here, need to make sure Windows events and memory are managed
Application.DoEvents();
if (lineno % 1000 == 0)
{
GC.Collect();
}
line = line.Trim();
if (string.IsNullOrEmpty(line))
{
continue;
}
try
{
// first see if that was a proprietary, non-NMEA packet:
if (line.IndexOf("*") < 0)
{
LibSys.StatusBar.Trace("proprietary packet: " + line);
if (packetIn != null && packetIn.isGood)
{
LibSys.StatusBar.Trace("last good NMEA packet: " + packetIn);
}
if (line.StartsWith("$ADVER,"))
{
Project.trackId++;
createInfo.init("trk");
createInfo.id = Project.trackId;
createInfo.source = source;
createInfo.name = "GPS NMEA Log";
insertWaypoint(createInfo);
}
}
else
{
packetIn = new NmeaPacketReceived();
packetIn.isGood = false;
packetIn.m_string = line;
if (!NmeaPacket.checksumVerify(packetIn.m_string))
{
packetIn.isGood = false;
LibSys.StatusBar.Error("bad checksum, line " + lineno + " bad packet: " + line);
}
else
{
packetIn.isGood = packetIn.basicParse(packetIn.m_string);
// packet is good and parsed, so the fields array is filled
//LibSys.StatusBar.Trace("NMEA packet: " + packetIn);
if (packetIn.header.EndsWith("GGA")) // NMEA GGA expected for location
{
//LibSys.StatusBar.Trace("process: " + packetIn.header + " packet, count=" + packetsCount + " content=" + packetIn);
try
{
NmeaPacket pvt = packetIn.fromString();
/*
* $GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47
*
* Where:
* GGA Global Positioning System Fix Data
* 0 123519 Fix taken at 12:35:19 UTC
* 1 4807.038,N Latitude 48 deg 07.038' N
* 3 01131.000,E Longitude 11 deg 31.000' E
* 5 1 Fix quality: 0 = invalid
* 1 = GPS fix
* 2 = DGPS fix
* 6 = estimated (2.3 feature)
* 6 08 Number of satellites being tracked
* 7 0.9 Horizontal dilution of position
* 8 545.4,M Altitude, Meters, above mean sea level
* 10 46.9,M Height of geoid (mean sea level) above WGS84
* ellipsoid
* 12 (empty field) time in seconds since last DGPS update
* 13 (empty field) DGPS station ID number
* 47 the checksum data, always begins with *
*/
lat = pvt.parseLat(1);
lng = pvt.parseLng(1);
elev = pvt.parseElev(8); // alt above mean sea level
// time component (don't know the date):
dateTime = pvt.parseNmeaTime(0, dateTime); // UTC
dateTime = dateTime.AddHours(-zoneShift);
// errors and velocity:
double posError = 0;
double posErrorH = 0;
double posErrorV = 0;
double fix = 0; // failed integrity check
switch ((string)pvt.fields[5])
{
case "0": // invalid
fix = 1; // invalid
break;
case "1": // GPS fix
fix = 2; // two dimensional
break;
case "2": // DGPS fix
fix = 4; // two dimensional differential
break;
case "6": // estimated
fix = 6; // estimated
break;
}
string comment = "received " + packetIn.header;
//realtimeCallback(pvtData);
createInfo.init("trkpt");
createInfo.id = Project.trackId; // relate waypoint to track
createInfo.dateTime = dateTime;
createInfo.lat = lat;
createInfo.lng = lng;
createInfo.elev = elev;
createInfo.source = source;
insertWaypoint(createInfo);
wpCount++;
packetsCount++;
}
catch (Exception ee)
{
LibSys.StatusBar.Error("StartRealTime: " + ee.Message);
}
}
else if (packetIn.header.EndsWith("RMC")) // NMEA RMC may come
{
//LibSys.StatusBar.Trace("process: " + packetIn.header + " packet, count=" + packetsCount + " content=" + packetIn);
try
{
NmeaPacket pvt = packetIn.fromString();
// $GPRMC,052458.73,V,3334.6441,N,11739.6622,W,00.0,000.0,290103,13,E*4F
/*
* see http://www.gpsinformation.org/dale/nmea.htm for NMEA reference
*
* RMC - NMEA has its own version of essential gps pvt (position, velocity, time) data.
* It is called RMC, The Recommended Minimum, which might look like:
*
* $GPRMC,123519,A,4807.038,N,01131.000,E,022.4,084.4,230394,003.1,W*6A
* $GPRMC,050821.000,A,3334.5551,N,11739.7705,W,0.00,,251006,,,A*67
*
* Where:
* RMC Recommended Minimum sentence C
* 0 123519 Fix taken at 12:35:19 UTC
* 1 A Status A=active or V=Void.
* 2 4807.038,N Latitude 48 deg 07.038' N
* 4 01131.000,E Longitude 11 deg 31.000' E
* 6 022.4 Speed over the ground in knots
* 7 084.4 Track angle in degrees True
* 8 230394 Date - 23rd of March 1994
* 9 003.1,W Magnetic Variation
* 6A The checksum data, always begins with *
*
* Note that, as of the 2.3 release of NMEA, there is a new field in the RMC sentence
* at the end just prior to the checksum. The value of the entry is
* A=autonomous, D=differential, E=estimated, N=Data not valid.
*/
bool status = "A".Equals(pvt.fields[1]);
if (status)
{
lat = pvt.parseLat(2);
lng = pvt.parseLng(2);
//double elev = 0.0d; // inherit elevation from a GGA
//LibSys.StatusBar.Trace("coord=" + pvtData.location);
// time component (only time part):
dateTime = pvt.parseNmeaDateTime(0, 8); // UTC
dateTime = dateTime.AddHours(-zoneShift);
//if (!"".Equals(pvt.fields[6]))
//{
// double knots = Convert.ToDouble(pvt.fields[6]);
// pvtData.velocity = knots * Distance.METERS_PER_NAUTICAL_MILE / 3600.0d;
// // calculate velocity vector based on track angle:
// if (!"".Equals(pvt.fields[7]))
// {
// double trackAngleRad = Convert.ToDouble(pvt.fields[7]) * Math.PI / 180.0d;
// pvtData.velocityNorth = pvtData.velocity * Math.Cos(trackAngleRad);
// pvtData.velocityEast = pvtData.velocity * Math.Sin(trackAngleRad);
// }
//}
//pvtData.fix = 2; // assume two-dimensional
//pvtData.comment = "received " + received.header;
createInfo.init("trkpt");
createInfo.id = Project.trackId; // relate waypoint to track
createInfo.dateTime = dateTime;
createInfo.lat = lat;
createInfo.lng = lng;
createInfo.elev = elev;
createInfo.source = source;
insertWaypoint(createInfo);
wpCount++;
}
packetsCount++;
}
catch (Exception ee)
{
LibSys.StatusBar.Error("StartRealTime: " + ee.Message);
}
}
else if (packetIn.header.EndsWith("WPL")) // NMEA WPL may come as a result of manually marking a location
{
//LibSys.StatusBar.Trace("process: " + packetIn.header + " packet, count=" + packetsCount + " content=" + packetIn);
try
{
NmeaPacket pvt = packetIn.fromString();
// $GPWPL,3334.7038,N,11739.7796,W,00001*61
/*
* see http://www.gpsinformation.org/dale/nmea.htm for NMEA reference
*
* WPL - Waypoint Location data provides essential waypoint data. It is output when navigating to indicate data about the destination
* and is sometimes supported on input to redefine a waypoint location. Note that waypoint data as defined in the standard
* does not define altitude, comments, or icon data. When a route is active, this sentence is sent once for each waypoint in
* the route, in sequence. When all waypoints have been reported, the RTE sentence is sent in the next data set.
* In any group of sentences, only one WPL sentence, or an RTE sentence, will be sent.
*
* $GPWPL,4807.038,N,01131.000,E,WPTNME*5C
*
* With an interpretation of:
*
* WPL Waypoint Location
* 0 4807.038,N Latitude
* 1 01131.000,E Longitude
* 2 WPTNME Waypoint Name
* 5C The checksum data, always begins with *
*
*/
lat = pvt.parseLat(0);
lng = pvt.parseLng(0);
//elev = 0.0d; // inherit elevation
//LibSys.StatusBar.Trace("coord=" + pvtData.location);
createInfo.init("wpt");
createInfo.lat = lat;
createInfo.lng = lng;
createInfo.elev = elev;
createInfo.dateTime = dateTime;
createInfo.name = "" + pvt.fields[4];
createInfo.source = source;
insertWaypoint(createInfo);
wpCount++;
packetsCount++;
}
catch (Exception ee)
{
LibSys.StatusBar.Error("StartRealTime: " + ee.Message);
}
}
//else if (packetIn.header.EndsWith("GLL")) // NMEA GLL may come
//{
// LibSys.StatusBar.Trace("process: " + packetIn.header + " packet, count=" + packetsCount + " content=" + packetIn);
// try
// {
// NmeaPacket pvt = packetIn.fromString();
// // $GPGLL,3334.6464,N,11739.6583,W,052707.129,A*29
// /*
// * see http://www.gpsinformation.org/dale/nmea.htm for NMEA reference
// *
// GLL - Geographic Latitude and Longitude is a holdover from Loran data and some old units
// may not send the time and data valid information if they are emulating Loran data.
// If a gps is emulating Loran data they may use the LC Loran prefix instead of GP.
// $GPGLL,4916.45,N,12311.12,W,225444,A,*31
// Where:
// GLL Geographic position, Latitude and Longitude
// 0 4916.46,N Latitude 49 deg. 16.45 min. North
// 2 12311.12,W Longitude 123 deg. 11.12 min. West
// 4 225444 Fix taken at 22:54:44 UTC
// 5 A Data valid or V (void)
// *31 checksum data
// */
// bool status = "A".Equals(pvt.fields[5]);
// if (status)
// {
// double lat = pvt.parseLat(0);
// double lng = pvt.parseLng(0);
// double elev = 0.0d;
// // time component (only time part):
// //pvtData.time = pvt.parseNmeaTime(4); // UTC
// //pvtData.fix = 2; // assume two-dimensional
// //pvtData.comment = "received " + received.header;
// createInfo.init("trkpt");
// createInfo.id = Project.trackId; // relate waypoint to track
// //createInfo.dateTime = dateTime;
// createInfo.lat = lat;
// createInfo.lng = lng;
// createInfo.elev = elev;
// createInfo.source = source;
// insertWaypoint(createInfo);
// wpCount++;
// }
// packetsCount++;
// }
// catch (Exception ee)
// {
// LibSys.StatusBar.Error("StartRealTime: " + ee.Message);
// }
//}
else if (packetIn.header.EndsWith("GSV")) // NMEA GSV may come for satellite reception status
{
//LibSys.StatusBar.Trace("process: " + packetIn.header + " packet, count=" + packetsCount + " content=" + packetIn);
// /*
// * see http://www.gpsinformation.org/dale/nmea.htm for NMEA reference
// *
// $GPGSV,3,1,08,14,69,204,,15,57,105,36,18,45,047,36,03,42,263,36*71
// $GPGSV,2,1,08,01,40,083,46,02,17,308,41,12,07,344,39,14,22,228,45*75
// Where:
// GSV Satellites in view
// 0 2 Number of sentences for full data
// 1 1 sentence 1 of 2
// 2 08 Number of satellites in view
// for up to 4 satellites per sentence {
// 3 01 Satellite PRN number
// 4 40 Elevation, degrees
// 5 083 Azimuth, degrees
// 6 46 Signal strength - higher is better
// }
// *75 the checksum data, always begins with *
// */
// //MPacket pvt = received.fromString();
// //pvtData.comment = "received";
// //realtimeCallback(pvtData);
packetsCount++;
}
else if (packetIn.header.EndsWith("VTG")) // NMEA GSA may come
{
//LibSys.StatusBar.Trace("process: " + packetIn.header + " packet, count=" + packetsCount + " content=" + packetIn);
// $GPVTG,309.62,T,,M,0.13,N,0.2,K*6E
/*
* VTG - Course Over Ground and Ground Speed
*
* Name Example Units Description
* Message ID $GPVTG VTG protocol header
* Course 309.62 degrees Measured heading
* Reference T True
* Course degrees Measured heading
* Reference M Magnetic
* Speed 0.13 knots Measured horizontal speed
* Units N Knots
* Speed 0.2 Km/hr Measured horizontal speed
* Units K Kilometers per hour
*/
packetsCount++;
}
else if (packetIn.header.EndsWith("GSA")) // NMEA GSA may come
{
//LibSys.StatusBar.Trace("process: " + packetIn.header + " packet, count=" + packetsCount + " content=" + packetIn);
// $GPGSA,A,2,15,18,14,31,,,,,,,,,05.6,05.6,*17
/*
* see http://www.gpsinformation.org/dale/nmea.htm for NMEA reference
*
* GSA - GPS DOP and active satellites. This sentence provides details on the nature of the
* fix. It includes the numbers of the satellites being used in the current solution and
* the DOP. DOP (dilution of precision) is an indication of the effect of satellite geometry
* on the accuracy of the fix. It is a unitless number where smaller is better. For 3D fixes
* using 4 satellites a 1.0 would be considered to be a perfect number. For overdetermined
* solutions it is possible to see numbers below 1.0. There are differences in the way the
* PRN's are presented which can effect the ability of some programs to display this data.
* For example, in the example shown below there are 5 satellites in the solution and
* the null fields are scattered indicating that the almanac would show satellites in
* the null positions that are not being used as part of this solution. Other receivers
* might output all of the satellites used at the beginning of the sentence with the
* null field all stacked up at the end. This difference accounts for some satellite
* display programs not always being able to display the satellites being tracked.
*
* $GPGSA,A,3,04,05,,09,12,,,24,,,,,2.5,1.3,2.1*39
*
* Where:
* GSA Satellite status
* A Auto selection of 2D or 3D fix (M = manual)
* 3 3D fix - other values include: 1 = no fix
* 2 = 2D fix
* 04,05... PRNs of satellites used for fix (space for 12)
* 2.5 PDOP (dilution of precision)
* 1.3 Horizontal dilution of precision (HDOP)
* 2.1 Vertical dilution of precision (VDOP)
* 39 the checksum data, always begins with *
*
*/
packetsCount++;
}
else
{
LibSys.StatusBar.Trace("StartRealTime: good other (unrecognized) packet received, count=" + packetsCount + " content=" + packetIn);
}
}
}
}
catch (Exception ee)
{
LibSys.StatusBar.Error("FileNmeaLog:process(): file=" + filename + " line=" + lineno + " " + ee.Message);
}
}
}
catch (Exception eee)
{
LibSys.StatusBar.Error("FileNmeaLog:process(): " + eee.Message);
ret = false;
}
finally
{
Cursor.Current = Cursors.Default;
Application.DoEvents();
}
LibSys.StatusBar.Trace("OK: FileNmeaLog:process() filename=" + filename + " lines=" + lineno + ", packets=" + packetsCount + " waypoints=" + wpCount);
return(ret);
}
public override bool process(string url, string filename, string source)
{
bool ret = true;
LibSys.StatusBar.Trace("IP: FileNmeaLog:process() filename=" + filename);
int wpCount = 0;
int lineno = 0;
int packetsCount = 0;
Cursor.Current = Cursors.WaitCursor;
try
{
string line;
double zoneShift = 0.0d;
NmeaPacketReceived packetIn = null;
CreateInfo createInfo = new CreateInfo(); // we will recycle it in place, filling every time.
double lat = 0.0d;
double lng = 0.0d;
// we allow elev and dateTime to stay in the cycle and be promoted/inherited to points that do not have this data in NMEA sentence.
double elev = 0.0d; // alt above mean sea level
DateTime dateTime = DateTime.Now;
StreamReader stream = new StreamReader(filename);
while ((line = stream.ReadLine()) != null)
{
lineno++;
// we are in a VERY long cycle here, need to make sure Windows events and memory are managed
Application.DoEvents();
if (lineno % 1000 == 0)
{
GC.Collect();
}
line = line.Trim();
if (string.IsNullOrEmpty(line))
{
continue;
}
try
{
// first see if that was a proprietary, non-NMEA packet:
if (line.IndexOf("*") < 0)
{
LibSys.StatusBar.Trace("proprietary packet: " + line);
if (packetIn != null && packetIn.isGood)
{
LibSys.StatusBar.Trace("last good NMEA packet: " + packetIn);
}
if (line.StartsWith("$ADVER,"))
{
Project.trackId++;
createInfo.init("trk");
createInfo.id = Project.trackId;
createInfo.source = source;
createInfo.name = "GPS NMEA Log";
insertWaypoint(createInfo);
}
}
else
{
packetIn = new NmeaPacketReceived();
packetIn.isGood = false;
packetIn.m_string = line;
if (!NmeaPacket.checksumVerify(packetIn.m_string))
{
packetIn.isGood = false;
LibSys.StatusBar.Error("bad checksum, line " + lineno + " bad packet: " + line);
}
else
{
packetIn.isGood = packetIn.basicParse(packetIn.m_string);
// packet is good and parsed, so the fields array is filled
//LibSys.StatusBar.Trace("NMEA packet: " + packetIn);
if (packetIn.header.EndsWith("GGA")) // NMEA GGA expected for location
{
//LibSys.StatusBar.Trace("process: " + packetIn.header + " packet, count=" + packetsCount + " content=" + packetIn);
try
{
NmeaPacket pvt = packetIn.fromString();
/*
$GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47
Where:
GGA Global Positioning System Fix Data
0 123519 Fix taken at 12:35:19 UTC
1 4807.038,N Latitude 48 deg 07.038' N
3 01131.000,E Longitude 11 deg 31.000' E
5 1 Fix quality: 0 = invalid
1 = GPS fix
2 = DGPS fix
6 = estimated (2.3 feature)
6 08 Number of satellites being tracked
7 0.9 Horizontal dilution of position
8 545.4,M Altitude, Meters, above mean sea level
10 46.9,M Height of geoid (mean sea level) above WGS84
ellipsoid
12 (empty field) time in seconds since last DGPS update
13 (empty field) DGPS station ID number
*47 the checksum data, always begins with *
*/
lat = pvt.parseLat(1);
lng = pvt.parseLng(1);
elev = pvt.parseElev(8); // alt above mean sea level
// time component (don't know the date):
dateTime = pvt.parseNmeaTime(0, dateTime); // UTC
dateTime = dateTime.AddHours(-zoneShift);
// errors and velocity:
double posError = 0;
double posErrorH = 0;
double posErrorV = 0;
double fix = 0; // failed integrity check
switch ((string)pvt.fields[5])
{
case "0": // invalid
fix = 1; // invalid
break;
case "1": // GPS fix
fix = 2; // two dimensional
break;
case "2": // DGPS fix
fix = 4; // two dimensional differential
break;
case "6": // estimated
fix = 6; // estimated
break;
}
string comment = "received " + packetIn.header;
//realtimeCallback(pvtData);
createInfo.init("trkpt");
createInfo.id = Project.trackId; // relate waypoint to track
createInfo.dateTime = dateTime;
createInfo.lat = lat;
createInfo.lng = lng;
createInfo.elev = elev;
createInfo.source = source;
insertWaypoint(createInfo);
wpCount++;
packetsCount++;
}
catch (Exception ee)
{
LibSys.StatusBar.Error("StartRealTime: " + ee.Message);
}
}
else if (packetIn.header.EndsWith("RMC")) // NMEA RMC may come
{
//LibSys.StatusBar.Trace("process: " + packetIn.header + " packet, count=" + packetsCount + " content=" + packetIn);
try
{
NmeaPacket pvt = packetIn.fromString();
// $GPRMC,052458.73,V,3334.6441,N,11739.6622,W,00.0,000.0,290103,13,E*4F
/*
* see http://www.gpsinformation.org/dale/nmea.htm for NMEA reference
*
RMC - NMEA has its own version of essential gps pvt (position, velocity, time) data.
It is called RMC, The Recommended Minimum, which might look like:
$GPRMC,123519,A,4807.038,N,01131.000,E,022.4,084.4,230394,003.1,W*6A
$GPRMC,050821.000,A,3334.5551,N,11739.7705,W,0.00,,251006,,,A*67
Where:
RMC Recommended Minimum sentence C
0 123519 Fix taken at 12:35:19 UTC
1 A Status A=active or V=Void.
2 4807.038,N Latitude 48 deg 07.038' N
4 01131.000,E Longitude 11 deg 31.000' E
6 022.4 Speed over the ground in knots
7 084.4 Track angle in degrees True
8 230394 Date - 23rd of March 1994
9 003.1,W Magnetic Variation
*6A The checksum data, always begins with *
Note that, as of the 2.3 release of NMEA, there is a new field in the RMC sentence
at the end just prior to the checksum. The value of the entry is
A=autonomous, D=differential, E=estimated, N=Data not valid.
*/
bool status = "A".Equals(pvt.fields[1]);
if (status)
{
lat = pvt.parseLat(2);
lng = pvt.parseLng(2);
//double elev = 0.0d; // inherit elevation from a GGA
//LibSys.StatusBar.Trace("coord=" + pvtData.location);
// time component (only time part):
dateTime = pvt.parseNmeaDateTime(0, 8); // UTC
dateTime = dateTime.AddHours(-zoneShift);
//if (!"".Equals(pvt.fields[6]))
//{
// double knots = Convert.ToDouble(pvt.fields[6]);
// pvtData.velocity = knots * Distance.METERS_PER_NAUTICAL_MILE / 3600.0d;
// // calculate velocity vector based on track angle:
// if (!"".Equals(pvt.fields[7]))
// {
// double trackAngleRad = Convert.ToDouble(pvt.fields[7]) * Math.PI / 180.0d;
// pvtData.velocityNorth = pvtData.velocity * Math.Cos(trackAngleRad);
// pvtData.velocityEast = pvtData.velocity * Math.Sin(trackAngleRad);
// }
//}
//pvtData.fix = 2; // assume two-dimensional
//pvtData.comment = "received " + received.header;
createInfo.init("trkpt");
createInfo.id = Project.trackId; // relate waypoint to track
createInfo.dateTime = dateTime;
createInfo.lat = lat;
createInfo.lng = lng;
createInfo.elev = elev;
createInfo.source = source;
insertWaypoint(createInfo);
wpCount++;
}
packetsCount++;
}
catch (Exception ee)
{
LibSys.StatusBar.Error("StartRealTime: " + ee.Message);
}
}
else if (packetIn.header.EndsWith("WPL")) // NMEA WPL may come as a result of manually marking a location
{
//LibSys.StatusBar.Trace("process: " + packetIn.header + " packet, count=" + packetsCount + " content=" + packetIn);
try
{
NmeaPacket pvt = packetIn.fromString();
// $GPWPL,3334.7038,N,11739.7796,W,00001*61
/*
see http://www.gpsinformation.org/dale/nmea.htm for NMEA reference
WPL - Waypoint Location data provides essential waypoint data. It is output when navigating to indicate data about the destination
and is sometimes supported on input to redefine a waypoint location. Note that waypoint data as defined in the standard
does not define altitude, comments, or icon data. When a route is active, this sentence is sent once for each waypoint in
the route, in sequence. When all waypoints have been reported, the RTE sentence is sent in the next data set.
In any group of sentences, only one WPL sentence, or an RTE sentence, will be sent.
$GPWPL,4807.038,N,01131.000,E,WPTNME*5C
With an interpretation of:
WPL Waypoint Location
0 4807.038,N Latitude
1 01131.000,E Longitude
2 WPTNME Waypoint Name
*5C The checksum data, always begins with *
*/
lat = pvt.parseLat(0);
lng = pvt.parseLng(0);
//elev = 0.0d; // inherit elevation
//LibSys.StatusBar.Trace("coord=" + pvtData.location);
createInfo.init("wpt");
createInfo.lat = lat;
createInfo.lng = lng;
createInfo.elev = elev;
createInfo.dateTime = dateTime;
createInfo.name = "" + pvt.fields[4];
createInfo.source = source;
insertWaypoint(createInfo);
wpCount++;
packetsCount++;
}
catch (Exception ee)
{
LibSys.StatusBar.Error("StartRealTime: " + ee.Message);
}
}
//else if (packetIn.header.EndsWith("GLL")) // NMEA GLL may come
//{
// LibSys.StatusBar.Trace("process: " + packetIn.header + " packet, count=" + packetsCount + " content=" + packetIn);
// try
// {
// NmeaPacket pvt = packetIn.fromString();
// // $GPGLL,3334.6464,N,11739.6583,W,052707.129,A*29
// /*
// * see http://www.gpsinformation.org/dale/nmea.htm for NMEA reference
// *
// GLL - Geographic Latitude and Longitude is a holdover from Loran data and some old units
// may not send the time and data valid information if they are emulating Loran data.
// If a gps is emulating Loran data they may use the LC Loran prefix instead of GP.
// $GPGLL,4916.45,N,12311.12,W,225444,A,*31
// Where:
// GLL Geographic position, Latitude and Longitude
// 0 4916.46,N Latitude 49 deg. 16.45 min. North
// 2 12311.12,W Longitude 123 deg. 11.12 min. West
// 4 225444 Fix taken at 22:54:44 UTC
// 5 A Data valid or V (void)
// *31 checksum data
// */
// bool status = "A".Equals(pvt.fields[5]);
// if (status)
// {
// double lat = pvt.parseLat(0);
// double lng = pvt.parseLng(0);
// double elev = 0.0d;
// // time component (only time part):
// //pvtData.time = pvt.parseNmeaTime(4); // UTC
// //pvtData.fix = 2; // assume two-dimensional
// //pvtData.comment = "received " + received.header;
// createInfo.init("trkpt");
// createInfo.id = Project.trackId; // relate waypoint to track
// //createInfo.dateTime = dateTime;
// createInfo.lat = lat;
// createInfo.lng = lng;
// createInfo.elev = elev;
// createInfo.source = source;
// insertWaypoint(createInfo);
// wpCount++;
// }
// packetsCount++;
// }
// catch (Exception ee)
// {
// LibSys.StatusBar.Error("StartRealTime: " + ee.Message);
// }
//}
else if (packetIn.header.EndsWith("GSV")) // NMEA GSV may come for satellite reception status
{
//LibSys.StatusBar.Trace("process: " + packetIn.header + " packet, count=" + packetsCount + " content=" + packetIn);
// /*
// * see http://www.gpsinformation.org/dale/nmea.htm for NMEA reference
// *
// $GPGSV,3,1,08,14,69,204,,15,57,105,36,18,45,047,36,03,42,263,36*71
// $GPGSV,2,1,08,01,40,083,46,02,17,308,41,12,07,344,39,14,22,228,45*75
// Where:
// GSV Satellites in view
// 0 2 Number of sentences for full data
// 1 1 sentence 1 of 2
// 2 08 Number of satellites in view
// for up to 4 satellites per sentence {
// 3 01 Satellite PRN number
// 4 40 Elevation, degrees
// 5 083 Azimuth, degrees
// 6 46 Signal strength - higher is better
// }
// *75 the checksum data, always begins with *
// */
// //MPacket pvt = received.fromString();
// //pvtData.comment = "received";
// //realtimeCallback(pvtData);
packetsCount++;
}
else if (packetIn.header.EndsWith("VTG")) // NMEA GSA may come
{
//LibSys.StatusBar.Trace("process: " + packetIn.header + " packet, count=" + packetsCount + " content=" + packetIn);
// $GPVTG,309.62,T,,M,0.13,N,0.2,K*6E
/*
VTG - Course Over Ground and Ground Speed
Name Example Units Description
Message ID $GPVTG VTG protocol header
Course 309.62 degrees Measured heading
Reference T True
Course degrees Measured heading
Reference M Magnetic
Speed 0.13 knots Measured horizontal speed
Units N Knots
Speed 0.2 Km/hr Measured horizontal speed
Units K Kilometers per hour
*/
packetsCount++;
}
else if (packetIn.header.EndsWith("GSA")) // NMEA GSA may come
{
//LibSys.StatusBar.Trace("process: " + packetIn.header + " packet, count=" + packetsCount + " content=" + packetIn);
// $GPGSA,A,2,15,18,14,31,,,,,,,,,05.6,05.6,*17
/*
* see http://www.gpsinformation.org/dale/nmea.htm for NMEA reference
*
GSA - GPS DOP and active satellites. This sentence provides details on the nature of the
fix. It includes the numbers of the satellites being used in the current solution and
the DOP. DOP (dilution of precision) is an indication of the effect of satellite geometry
on the accuracy of the fix. It is a unitless number where smaller is better. For 3D fixes
using 4 satellites a 1.0 would be considered to be a perfect number. For overdetermined
solutions it is possible to see numbers below 1.0. There are differences in the way the
PRN's are presented which can effect the ability of some programs to display this data.
For example, in the example shown below there are 5 satellites in the solution and
the null fields are scattered indicating that the almanac would show satellites in
the null positions that are not being used as part of this solution. Other receivers
might output all of the satellites used at the beginning of the sentence with the
null field all stacked up at the end. This difference accounts for some satellite
display programs not always being able to display the satellites being tracked.
$GPGSA,A,3,04,05,,09,12,,,24,,,,,2.5,1.3,2.1*39
Where:
GSA Satellite status
A Auto selection of 2D or 3D fix (M = manual)
3 3D fix - other values include: 1 = no fix
2 = 2D fix
04,05... PRNs of satellites used for fix (space for 12)
2.5 PDOP (dilution of precision)
1.3 Horizontal dilution of precision (HDOP)
2.1 Vertical dilution of precision (VDOP)
*39 the checksum data, always begins with *
*/
packetsCount++;
}
else
{
LibSys.StatusBar.Trace("StartRealTime: good other (unrecognized) packet received, count=" + packetsCount + " content=" + packetIn);
}
}
}
}
catch (Exception ee)
{
LibSys.StatusBar.Error("FileNmeaLog:process(): file=" + filename + " line=" + lineno + " " + ee.Message);
}
}
}
catch (Exception eee)
{
LibSys.StatusBar.Error("FileNmeaLog:process(): " + eee.Message);
ret = false;
}
finally
{
Cursor.Current = Cursors.Default;
Application.DoEvents();
}
LibSys.StatusBar.Trace("OK: FileNmeaLog:process() filename=" + filename + " lines=" + lineno + ", packets=" + packetsCount + " waypoints=" + wpCount);
return ret;
}
