Changes between Version 13 and Version 14 of WKTRasterGSoC
- Timestamp:
- 03/24/11 12:52:55 (14 years ago)
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WKTRasterGSoC
v13 v14 32 32 1) '''ST_AsRaster''' takes a geometry and converts it to a raster. 33 33 34 2) '''ST_ AsDensity''' takes a point or line geometry coverage and first assign a count of those features to every pixels of a raster coverage and then apply a smoothing filter (using the existing one raster version of neighbour ST_MapAlgebra). Density functions allow summarizing or simplifying a point or line dataset.34 2) '''ST_Interpolate''' takes a point (e.g. filtered lidar points) or line geometry (e.g. digitized topo lines) coverage to interpolate pixels values between geometries. There are numerous methods of interpolation and it would nice to have a generic method so we can use all of them, but we’re first targeting bilinear interpolation, which will fill most needs and lay the ground for other methods. 35 35 36 3) '''ST_ Interpolate''' takes a point (e.g. filtered lidar points) or line geometry (e.g. digitized topo lines) coverage to interpolate pixels values between geometries. There are numerous methods of interpolation and it would nice to have a generic method so we can use all of them, but we’re first targeting bilinear interpolation, which will fill most needs and lay the ground for other methods.36 3) '''ST_AsDensity''' takes a point or line geometry coverage and first assign a count of those features to every pixels of a raster coverage and then apply a smoothing filter (using the existing one raster version of neighbour ST_MapAlgebra). Density functions allow summarizing or simplifying a point or line dataset. 37 37 38 38 Want more details? Write to the [http://postgis.refractions.net/mailman/listinfo/postgis-devel PostGIS developer list].
