[postgis-users] Geoprocessing & BigData

[Ravi Pavuluri]

Felix,Thanks for the tip and  I am kind of doing the same way. An intersect or union would help me test and compare my result with other GIS software. Also, thanks for the mapbutcher link on union. I will look into it.

Steve, 
Thanks for the tiles approach, I am going to to give it a try. 

Pierre,Thanks for the postgis addon link. I will look into it.
-Ravi.
 

    On Tuesday, January 19, 2016 10:30 AM, Pierre Racine <Pierre.Racine at sbf.ulaval.ca> wrote:
 

 > @Vincent : For ArcGIS Union, please see here.
> http://resources.esri.com/help/9.3/arcgisengine/java/gp_toolref/analysis_
> tools/union_analysis_.htm

ArcGIS Union resume to removing overlaps from the union of two tables. Look at the ST_DifferenceAgg() example in the PostGIS Addons:

https://github.com/pedrogit/postgisaddons/blob/master/postgis_addons.sql

This  produce a clean table (layer) without overlaps from the union of two (polygon) tables (layers).

Pierre


  
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