Paul wrote >- So you can do raster analysis in the database? I can see the validity >in this, for the same reason doing vector analysis in the database is >powerful. The database serves as an integration point between vector, >raster, and attribute processing functionality.
I think even this is marginal. To efficiently do raster analysis the image file (or database) structure must be of fixed length. This is the ESRI grid format. That way you can directly calculate the values adjacent to the cell of interest(add or subtract exactly the length of one row from your file pointer to get the cell above or below). You cannot do this with a typical compressed image format. Bruce _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
