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Ok, thanks. I've provided a screenshot of a GPX file converted to KML using GPSVisualizer -
The settings are as per the link -
The problem I have is the current data loggers don't output in GPX (SkyTraq Venus format). Is GPSVisualizer doing something only available within GPX format? I should add I don't need a 'shadow' in the sense of sun-position, just ground-track.
--- On Mon, 25/4/11, Robert Lipe
From: Robert Lipe <robertlipe@...>
Subject: Re: [Gpsbabel-misc] Feature Suggestion - Shadow on ground (KML Export)
To: "TiC" <hellotic2003@...>
Received: Monday, 25 April, 2011, 1:05 AM
On Sun, Apr 24, 2011 at 9:34 AM, Robert Lipe <robertlipe@...> wrote:
On Sun, Apr 24, 2011 at 7:32 AM, TiC <hellotic2003@...> wrote:
The feature `Draw extrusion line from trackpoint to ground` is a bit unwieldy for aviation use because it blocks out lots of detail when examining a flight.
An alternative - `Draw shadow on ground` provides much of the 3D perspective without the bulk of a wall in the sky. The ground track position is still very valuable for debriefing when looking at the flight side-on.
What you're asking for can't be easily done in native KML. An additional point could be added that's clamped to ground and is a circle with a low opacity, but it would bloat the KML a LOT. Perhaps just changing the alpha channel (opacity) of the extrusion of the generated KML will give you the custom feature you're looking for.
Low-rent hack that's not quite a shadow but gives a similar visual effect: in Earth copy the LineString (Track), then edit the propoerties to set altitude to be clamped to ground and perhaps set the color different than the one hanging in the sky.
It won't animate "right" and it doesn't account for the position of the sun but it's something you can do in just a few seconds and get an effect similar to a shadow.