[Freegis-list] Newbie Question

[Frank Warmerdam]

Nico de Haen wrote:
> Hi Frank,
> 
> Thanks for your infos. I want to implement a tool for websites, using 
> the google map API for planing bycicle tours and storing them. I can 
> calculate the distance of points, but it would of course be nice, also 
> to include the elevation (especially for biker ;-)
> 
> What I don't understand: Where does your server get the data from? Do 
> you store it on your server? That must be a pretty big amount of data, 
> if it includes the elevation of all points of the world in a grid of 
> let's say 100 meters.

Nico,

In my case, the SRTM30 data is on 30second postings.  I elieve that
works out to a roughly 1km grid.  So only 100th the data of 100m
spacing.  It is still a 2GB file uncompressed and with overviews built.

> These WCS servers cannot be queried for single points?

They can be queried for single pixels but will return the result as
a raster file, as I mentioned before.

Best regards,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent