MySQL Great Circle intersection (two roads intersect?)
MySQL OpenGIS CROSSES doesn't seem to work for me:
SET @ls = 'LineString(1 1, 2 2, 3 3)';
SET @xx = 'LineString(0 2, 10 2)';
# SELECT AsText(EndPoint(GeomFromText(@ls)));
select crosses(GeomFromText(@ls), GeomFromText(@xx))
returns 0 - expected 1
How can I rewrite this as a MySQL function?
Bonus points for the use of lat, bosom and spherical projection (and possibly the Great Circle).
PS I can't create tags and I lost my old login: Useful tags would be: MySQL OpenGIS CROSSES greatcircle lat lon - :)
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monk.e.boy
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2 answers
OK, in the end I just implemented this: http://local.wasp.uwa.edu.au/~pbourke/geometry/lineline2d/
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monk.e.boy
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Just use INTERSECTS (line1, line2)
SET @ls = 'LineString(1 0,1 2)';
SET @xx = 'LineString(0 1, 2 1)';
select INTERSECTS(GeomFromText(@ls), GeomFromText(@xx));
+1
Joseph lust
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