[postgis-devel] [PostGIS] #1176: [raster] Two raster ST_Intersects

[PostGIS]

#1176: [raster] Two raster ST_Intersects
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 Reporter:  dustymugs       |       Owner:  dustymugs    
     Type:  enhancement     |      Status:  assigned     
 Priority:  medium          |   Milestone:  PostGIS 2.0.0
Component:  postgis raster  |     Version:  trunk        
 Keywords:                  |  
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Comment(by dustymugs):

 I don't believe your algorithm provides for the situation where two pixels
 (one from each raster) touch, such as when two rasters are next to one
 another.  In addition, if the two rasters only intersect at one pixel,
 looping over every pixel to find that one pixel may take far longer than
 need be.

 By using the grid lines of each raster in an every third line pattern and
 determining their intersection points, I can test for overlap, within and
 touches quickly and in one pass.

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/1176#comment:8>
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