PostGIS
Name
ST_Touches — Return true if raster rastA and rastB have at least one point in common but their interiors do not intersect.
Synopsis
boolean +`*`+ST_Touches*( raster rastA , integer nbandA
, raster rastB , integer nbandB );
boolean +`*`+ST_Touches*( raster rastA , raster rastB
);
Description
Return true if raster rastA spatially touches raster rastB. This means that rastA and rastB have at least one point in common but their interiors do not intersect. If the band number is not provided (or set to NULL), only the convex hull of the raster is considered in the test. If the band number is provided, only those pixels with value (not NODATA) are considered in the test.
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Availability: 2.1.0
Examples
SELECT r1.rid, r2.rid, ST_Touches(r1.rast, 1, r2.rast, 1) FROM dummy_rast r1 CROSS JOIN dummy_rast r2 WHERE r1.rid = 2;
rid | rid | st_touches
-----+-----+------------
2 | 1 | f
2 | 2 | f