Changes between Version 2 and Version 3 of UsersWikiCascadeUnion


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Timestamp:
Apr 15, 2009, 8:26:23 AM (15 years ago)
Author:
pracine
Comment:

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  • UsersWikiCascadeUnion

    v2 v3  
    99In general I have found it to be 5-10 times faster than the built-in ST_Union aggregate function and also it finishes to completion in many cases where the built-in one runs out of memory.
    1010
    11 The code can be downloaded from [http://www.bostongis.com/downloads/upgis_cascadeunion_functions_plpgsql.zip | http://www.bostongis.com/downloads/upgis_cascadeunion_functions_plpgsql.zip]
     11The code can be downloaded from [http://www.bostongis.com/downloads/upgis_cascadeunion_functions_plpgsql.zip]
    1212
    1313It is loosely based on the concepts used in JTS 1.9 Union Operator (aka Cascaded Union) which is described at
    1414
    15 [http://lin-ear-th-inking.blogspot.com/2007/11/fast-polygon-merging-in-jts-using.html | http://lin-ear-th-inking.blogspot.com/2007/11/fast-polygon-merging-in-jts-using.html]
     15[http://lin-ear-th-inking.blogspot.com/2007/11/fast-polygon-merging-in-jts-using.html]
    1616
    1717Example use: