Hello, Thanks for your answer.
If some functions can't handle all the pixels, this is a big limit for the use of tiled rasters if some function can't handle all the pixels although tiling and indexing raster is a major improvement (thanks to postgis).It's going to be tricky if we need to have both tiled and untiled version for the same raster. Hugues. -------- Message d'origine-------- De: postgis-users-boun...@postgis.refractions.net de la part de Pierre Racine Date: mer. 13/06/2012 21:13 À: PostGIS Users Discussion Objet : Re: [postgis-users] How does ST_Slope works ? > 1. To know which Pixeltype I had to use, I tried to use st_bandpixeltype which > told me my pixels were 32BSI type but my results using this type are 0 or 1 > and if > I try another type like 32BF, results seems to be more useful. Does someone > have an explanation about this weird difference ? What is the unit used by > st_slope ? The results are in radian so rounded to 0 or 1 when the pixel type is integer. > 2. My raster is a tiled one and as you can see on both pictures, ST_Slope > gives no > results for pixels located at the border of each tile. I can understand it is > impossible to find the slope for the pixels which make the border of the > raster, > but is there not a way to have complete results for the tile in the middle of > the > raster and thus use the neighboring tiles. Not yet. The only way is to load the raster untiled or to ST_Union them which might be slow. Pierre _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
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