KML Generator Help
GENERAL GUIDELINES
1. This utility has been designed to convert GPS log files containing NMEA formated
strings into Google Earth (TM) compatible KML files.
2. This utility uses only the NMEA formatted strings with the prefix "GPRMC"
or "GPGGA".
The definition of these NMEA strings is as follows:
$GPRMC Sentence (Position and time)
Example (signal not acquired): $GPRMC,235947.000,V,0000.0000,N,00000.0000,E,,,041299,,*1D
Example (signal acquired): $GPRMC,092204.999,A,4250.5589,S,14718.5084,E,0.00,89.68,211200,,*25
Field Example Comments
Sentence ID $GPRMC
UTC Time 092204.999 hhmmss.sss
Status A A = Valid, V = Invalid
Latitude 4250.5589 ddmm.mmmm
N/S Indicator S N = North, S = South
Longitude 14718.5084 dddmm.mmmm
E/W Indicator E E = East, W = West
Speed over ground 0.00 Knots
Course over ground 0.00 Degrees
UTC Date 211200 DDMMYY
Magnetic variation Degrees
Magnetic variation E = East, W = West
Checksum *25
Terminator CR / LF
$GPGGA Sentence (Fix data)
Example (signal not acquired): $GPGGA,235947.000,0000.0000,N,00000.0000,E,0,00,0.0,0.0,M,,,,0000*00
Example (signal acquired): $GPGGA,092204.999,4250.5589,S,14718.5084,E,1,04,24.4,19.7,M,,,,0000*1F
Field Example Comments
Sentence ID $GPGGA
UTC Time 092204.999 hhmmss.sss
Latitude 4250.5589 ddmm.mmmm
N/S Indicator S N = North, S = South
Longitude 14718.5084 dddmm.mmmm
E/W Indicator E E = East, W = West
Position Fix 1 0 = Invalid, 1 = Valid SPS, 2 = Valid DGPS, 3 = Valid PPS
Satellites Used 04 Satellites being used (0-12)
HDOP 24.4 Horizontal dilution of precision
Altitude 19.7 Altitude in meters according to WGS-84 ellipsoid
Altitude Units M M = Meters
Geoid Seperation Geoid seperation in meters according to WGS-84 ellipsoid
Seperation Units M = Meters
DGPS Age Age of DGPS data in seconds
DGPS Station ID 0000
Checksum *1F
Terminator CR / LF
3. REVISION HISTORY
1.01 Initial release.
1.23 1) Added the data point display option.
- This feature allows for individual data points to be displayed.
- You can view specific GPS data for each data point by clicking on the icon.
- The data point icons are color-coded according to the speed at that point.
2) Added the max speed point display option.
3) Added the start/end point display option.
4) Added the ignore altitude display option.
- Previously altitude was ignored by default.
- When altitude is not ignored Google Earth will automatically zoom
to the starting point at an angle in order to view the altitude.
5) Added the max altitude point display option.
6) Added the option to save the GPS data to a comma separated value (csv) formatted file.
- This allows the user to view and analyze the GPS data in a spreadsheet editor
such as Open Office Calc or Microsoft Excel.
1.26 1) Modified the number printing format to force "." for the decimal separator.
- Google Earth will not recognize numbers with a "," for the decimal separator.
2) Added the ability to graphically edit data points.
3) Removed the "Fix Quality" item from the data point information.
- The GPS data is only used if the fix quality is "1".
4) Added an automatic bearing calculation when the
bearing information is not included in the GPS log file.
5) Fixed slight misplacement of 'Start', 'Stop' and 'Max' points.
6) Added an options for displaying/hiding the speed and altitude graphs.
7) Added a hidden option to load data from the GPS log even if it is invalid.
- To show this option hold the CTRL key and click the picture in the "Options" tab.
8) Added the ability to resize and minimize the application.
4. I have had limited access to GPS log files so if you find that this application
does not function correctly please email me with a description of the error and
a copy of your GPS log file.
5. Feel free to contact me with any suggestions, comments or errors that you may have.
Jacob C Madsen
KMLGenerator@MadsenCircuits.com
If you find this software useful and would like to make a contribution to
support further software development please send it via PayPal to
payments@madsencircuits.com. Thanks!
Jacob Madsen
KMLGenerator@MadsenCircuits.com
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