Changes between Version 31 and Version 32 of PostGIS_Raster_SoC_Idea_2012/Distance_Analysis_Tools/document

Timestamp:

Jul 15, 2012, 8:17:08 PM (12 years ago)

Author:

qliu

Comment:

—

PostGIS_Raster_SoC_Idea_2012/Distance_Analysis_Tools/document

@@ -98 +98 @@
 {{{
 Comments from Mentor:
-Right, ST_Within(raster, geometry) does not exist. But you would work with the centroid of the pixel, which is a point and the triangle of the TIN which are polygons and there is no problem doing that with ST_Within. If you would include the pixel centroid in the TIN as stated above, you would nort even have to do that as the centroid and the points would all be in the same TIN structure allowing fast find of neighbors.
+Right, ST_Within(raster, geometry) does not exist. But you would work with the centroid of the pixel, 
+which is a point and the triangle of the TIN which are polygons and there is no problem doing that 
+with ST_Within. If you would include the pixel centroid in the TIN as stated above, you would not 
+even have to do that as the centroid and the points would all be in the same TIN structure allowing 
+fast find of neighbors.
 }}}
  * Might be very inefficient and a waste of computing TIN in case there is only one point in the source table (Constraint 1) or there are very small number of source points and the requested raster is relatively small too (Constraint 5).