>Not sure where Paul is lurking these days, but I wanted to throw out >the name of an application that can already do half of what Pierre is >looking for: StarSpan. > >http://starspan.casil.ucdavis.edu/doku/doku.php > >This is the tool I use when ever I need to fuse raster with vector >data. Since it can use GDAL/OGR datatypes, it is possible to run >against PostGIS data directly. I commonly use it to cross postgis data >with rasters stored in GRASS.
Thanks for the suggestion Dylan. I didn't really consider StarSpan for some reasons: -I must run it as a (web) server. I could fork a new instance of it for each query but I don't really like that. -I must also "extract" information from vector layer. I don't like the idea of having one piece of (C?) code for vector/raster extraction and another one (SQL) for vector/vector extraction (using PostGIS). Vector/vector extraction is commonly done with intersection. The only piece missing was vector/raster intersection. This is why I came with the conclusion that I need raster integration in PostGIS. This is without speaking about the solution this bring to other raster/vector analysis problems. -Could StarSpan do it on a Canada wide tiled landsat coverage? I would probably have to write indexing code to avoid that StarSpan tries to extract pixel where vector do not intersect. The strenght of doing this in PostGIS is that it has all the stuff needed to implement large indexed/tiled coverage. It can do the job little by little without having to load a 2 GB raster... -Unfortunately, as you said, it would not do all the other interesting raster operations. Pierre _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
