AW: [postgis-users] How to access raster data?

[Düster Horst]

Convert raster to point vector data and import these point vector data to
PostGIS and create spatial index. To get height information relating to a
point of interest (POI) search all height points from your raster within a
search radius and calculate an inverse distance interpolation. The result is
the interpolated height of your POI.

Regards
Horst

---------------------------------
 
Dr. Horst Düster 
GIS-Koordinator /Amtschef Stv.

Kanton Solothurn 
Amt für Geoinformation
Abteilung SO!GIS Koordination
Werkhofstr. 65
CH-4509 Solothurn 

Tel.: ++41 (0)32 627 25 32 
Fax: ++41 (0)32 627 22 14

horst.duester at bd.so.ch 
www.sogis.so.ch



-----Ursprüngliche Nachricht-----
Von: Vortex [mailto:vortex25 at gmx.de]
Gesendet am: Donnerstag, 28. April 2005 10:05
An: postgis-users at postgis.refractions.net
Betreff: [postgis-users] How to access raster data?

Hello!

Is gdal_contour the only way to access raster data
within postgis? 
I need height information for single points and
i think GTOPO30 raster data would be sufficient.

Why does gdal_contour produces non-closed linestrings?
Are they at the border? I suppose i have to convert
the linestrings to polygons to search for matching
contour lines (planes in this case)?

Klaus
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