[Requests] OGC - Public comment on KML 2.3 standard

gary silva garyjamessilva at gmail.com
Sun Jan 11 19:59:26 EST 2015


PART A

1. Evaluator:

garyjamessilva at gmail.com

2. Submission:

http://www.opengis.net/doc/kml/2.3

Version: 1.0.0

PART B

1. Requirement:

Curently kml:Track & kml:MultiTrack only support a single color & width
style element for the line string drawn for entire Tracks.

Please consider adding support for multiple color & width style
elements/attributes to each individual kml:Track & kml:MultiTrack
(coordinate) segment or section.

2. Implementation Specification Section number:

10.15 kml:Track & 10.16 kml:MultiTrack

3. Criticality: [Major, Minor, Editorial, etc.]

Minor

4. Comments/justifications for changes:

Currently kml:Track & kml:MultiTrack only support a single color & width
style element for the line string drawn for entire tracks.

It is desirable to be able to (optionally) specify multi colored
coordinate segments
or sections along individual tracks, using different colors to more easily
denote visually different attributes associated with activities along a
track.

See for example the attached PNG image which shows individually (multi)
colored sections along a (single) track where different colors are used to
denote variable attributes of interest of some activity conducted along the
track - in this case changing ground speed and acceleration.

This example was achieved by drawing individual (colored) KML line strings
between every coordinate point pair along a track. But this approach has
the disadvantage of making the KML/KMZ very large for long duration / long
distance tracks, leading to lengthy KML load times in Google Earth as well
as 'crashes' in Google Earth when playing back long duration 'virtual' KML
Tour(s).

My request would be better achieved if it were somehow possible to add
individual color & width as Style elements within the Track element.

Thanks for your consideration, any questions please ask.

Regards Gary Silva
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