[postgis-users] contains function with complex polygons

[Gilbert, Antoine]

Hi

 

I have special case problem with the contains SQL function if I use
polygons with "island in a hole"

 

For example I have a polygon, with a lake in it (hole) and an island in
the middle of the lake, all these as a whole polygon.

 

I have a point location standing on the island.

 

Why the contains SQL function contains(myPolygon,myPoint) dosen't return
true for my point

 

I verified my geometries using JUMP and everything seems ok

 

Here is the point: POINT (-68.5167 63.7500)

 

Here is my complex polygon (multipolygon in fact)

 

MULTIPOLYGON(((-128.74153099999998 66.42965, -106.554262 32.849587,
-130.846486 40.578899, -152.378198 61.006418999999994,
-128.74153099999998 66.42965)),((-64.841883 75.565074, -48.866971
72.139282, -39.750806 62.662659999999995, -27.604758 32.297475999999996,
-77.997723 27.889585999999998, -96.791707 62.14741, -64.841883
75.565074),(-57.793946999999996 70.71189, -64.841883 72.710258,
-85.985179 63.860305999999994, -70.11599 56.037586999999995,
-54.035098999999995 59.578098, -57.793946999999996 70.71189),(-41.407126
47.204051, -49.688469999999995 39.474706999999995, -34.781974
36.162130999999995, -41.407126 47.204051),(-65.311643 60.434546,
-72.82933899999999 60.720017999999996, -76.11817099999999 65.28773,
-71.419803 67.000626, -64.371867 68.428018, -61.552794999999996
64.431282, -65.311643 60.434546)))

 

Formatted version:

 

MULTIPOLYGON (((

            -128.74153099999998 66.42965, 

            -106.554262 32.849587, 

            -130.846486 40.578899, 

            -152.378198 61.006418999999994, 

            -128.74153099999998 66.42965

        )), ((

            -64.841883 75.565074, 

            -48.866971 72.139282, 

            -39.750806 62.662659999999995, 

            -27.604758 32.297475999999996, 

            -77.997723 27.889585999999998, 

            -96.791707 62.14741, 

            -64.841883 75.565074

        ), (

            -57.793946999999996 70.71189, 

            -64.841883 72.710258, 

            -85.985179 63.860305999999994, 

            -70.11599 56.037586999999995, 

            -54.035098999999995 59.578098, 

            -57.793946999999996 70.71189

        ), (

            -41.407126 47.204051, 

            -49.688469999999995 39.474706999999995, 

            -34.781974 36.162130999999995, 

            -41.407126 47.204051

        ), (

            -65.311643 60.434546, 

            -72.82933899999999 60.720017999999996, 

            -76.11817099999999 65.28773, 

            -71.419803 67.000626, 

            -64.371867 68.428018, 

            -61.552794999999996 64.431282, 

            -65.311643 60.434546

        )))

 

 

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