[Freegis-list] how to visualise GPS data ?

[Maciek Sieczka]

On Tue, 7 Feb 2006 12:19:10 +0000 (GMT)
"Philipp H. Mohr" <phm4 at kent.ac.uk> wrote:

<snip>

> Insted of just plotting the points in 2D, I would like to plot the
> density of the points in the 3rd dimension. In the 2D map the points
> are just drawn above each other and it is not possible to see how
> many there are. What I am after is some thing that partitions the
> grid into cells and represents the number of point which fall into
> every cell in the 3rd dimension. Hope this makes sense.

Sounds like Grass should be able to do the job:
- import GPS points into points vector layer: v.in.garmin (if using
Garmin) / other v.in.* module (depending on how your GPS points are
stored)
- convert into raster grid layer storing the number of points in given
vicinity as each cell value: v.neighbors
- visualize the raster: nviz

More: http://grass.itc.it/gdp/manuals.php.

Good luck
Maciek

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