Christian Mayer wrote:
> Norman Vine schrieb:
>> Why not just store the Elevation data in a mixed record type of a
>> Polygon with a BLOB field ?
>
> I wouldn't store contour lines as you'll allways loose precision by
> converting the data (DEM -> contour lines -> triangle mesh).
Oh, I still believe that hand-crafted contour lines give us some of the
highest precision we can get. If you force the triangulator to let the
contour lines lie precisely in the triangulated surface (without any
weighing), then you'll inevitably get the desired result.
"Norman Vine" wrote:
> I agree you don't have to but there are advantages to doing so, the way you
> do this is to store the DEM as a BLOB whose polygon is a PostGIS object.
>
> Note this allows you to use PostGIS spatial functions
>
> Any way just a suggestion for a way to bring TerraGear into the world
> of the main stream Open Source GIS standards
Just for the understanding: Does this mean you are going to define an
area via the polygon and store the DEM as a BLOB that fits exactly into
this polygon ? I didn't realize that this was already common use ....
does todays OpenSource GIS software really handle DEM's this way ?
Cheers,
Martin.
--
Unix _IS_ user friendly - it's just selective about who its friends are !
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