[Gpsbabel-misc] converting to KML with speed coded as color?

[Udo van den Heuvel]

Hello,

I use a GPSport 245 to log data during cycling.
Using gpsbabel I can download the data [1] and convert to gpx in one go.
Next step is to convert to KML [2] to put the track in google maps.

Could I use gpsbabel 1.5.2 to color code the track with the speed that
is in the gpx?

Kind regards,
Udo


gpsbabel-1.5.2-1.fc20.x86_64
1 gpsbabel -D 4 -t -r -w -i m241 -f /dev/ttyUSB1 -o gpx -F `date
+'%F-%H-%M'`.gpx

2 gpsbabel -t -i gpx -f *.gpx -x nuketypes,waypoints,routes -x
simplify,count=500 -o
kml,points=0,labels="",lines="",trackdata="",units="m",line_color="990f0cf9"
-F `basename *gpx .gpx`".kml"

[Udo van den Heuvel]

Post by Udo van den Heuvel
Could I use gpsbabel 1.5.2 to color code the track with the speed that
is in the gpx?

At
http://stackoverflow.com/questions/11874858/colorise-single-track-in-kml-file
I read:

As previous answer says, you have to split track into segments and color
each segment individually. There is no other way to do this using KML.
But remember that this can create very large KML files for long tracks!
So try to save some space by using shared styles.


but also:

I would recommend creating one "gx:track" with low "draworder" for whole
track and collection of placemarks with different colors and high
"draworder" for every small segment of track.


Would this approach be doable with gpsbabel?

Kind regards,
Udo

[Robert Lipe]

GPSBabel doesn't have code for this for the very kinds of reasons hinted by
Udo. Given how KML styling works, you'd have to style each segment of the
track and my experiments doing that resulted in very large KML and poor
rendering in Earth. I've also not really figured out a very usable way to
present the data; make the top third speed green, the middle third yellow
and the bottom third red?

It's also not clear if Earth's Elevation Profile tool (which can do more
than just elevation) might not be a better vehicle for this.

Post by Udo van den Heuvel

Post by Udo van den Heuvel
Could I use gpsbabel 1.5.2 to color code the track with the speed that
is in the gpx?

At
http://stackoverflow.com/questions/11874858/colorise-single-track-in-kml-file
As previous answer says, you have to split track into segments and color
each segment individually. There is no other way to do this using KML.
But remember that this can create very large KML files for long tracks!
So try to save some space by using shared styles.
I would recommend creating one "gx:track" with low "draworder" for whole
track and collection of placemarks with different colors and high
"draworder" for every small segment of track.
Would this approach be doable with gpsbabel?
Kind regards,
Udo
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