Changes between Initial Version and Version 1 of UsersWikiGenerateHexagonalGrid

Timestamp:

04/14/09 11:02:13 (16 years ago)

Author:

pierre

Comment:

--

UsersWikiGenerateHexagonalGrid

@@ +1 @@
+= Generate Hexagonal Grid =
+
+
+The following SQL generates a table containing a set of polygons forming
+a grid of hexagonal cells.
+
+Substitute the values in the generate_series calls with the desired min/max X/Y extents.
+
+ 
+{{{
+CREATE TABLE hex_grid (gid serial not null primary key, the_geom geometry not null);
+
+ INSERT INTO hex_grid (the_geom)
+ SELECT translate(the_geom, x_series, y_series)
+ from generate_series(0 - 128, 10000 + 128, 128) as x_series,
+ generate_series(0 - 128, 10000 + 128, 256) as y_series,
+ (
+   SELECT 'POLYGON((0 0,64 64,64 128,0 192,-64 128,-64 64,0 0))'::geometry as the_geom
+   UNION
+   SELECT translate('POLYGON((0 0,64 64,64 128,0 192,-64 128,-64 64,0  0))'::geometry, 64, 128)  as the_geom
+ ) as one_hex
+
+}}}