Chris, I presume you are looking for a command-line solution given the examples you provided below?
I've been using OpenJump a lot lately - mostly for ad-hoc PostGIS queries, but it does support ESRI shape files as well and cursory glance of the menu options seems to suggest it fits your below requirements, but its a cross platform desktop open source tool (not a command-line tool). Things like Transfer Attributes, various functions - Union, Union by attribute,Aggregate, Intersection you can apply against 2 datasets. It is based on JTS code which GEOS is a port of, so at the very least looking at the code base may give you some ideas on how to leverage GEOS in Python to do what you are looking for. Hope that helps, Regina -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Wednesday, September 10, 2008 8:05 AM To: PostGIS Users Discussion Subject: [postgis-users] [OT] Extract data from within polygons - not inPostgis Hi list, apologies for an off-topic question, but some of you osgeo wizards might know an answer for my question. I need some help to do some geoprocessing _outside_ PostGIS using available open source tools. I have two shapefiles - the first one containing 'master' polygons, the second one can contain random features (lines, polygons or points). I now want to iterate through all polygons of the first shapefile and extract the features from the second file which are located within a given master polygon. The extracted features should also get some a new attribute based on which master polygon they are located in. So essentially it is a simple iteration over a 'within' query. Can this be done without converting the shapefiles to a different format using any of the existing open source tools (ogr2ogr, geos, shapely)? I would prefer to use Python, and if possible, the solution needs to be cross-platform (OS X, Win). If not, what would be the best way to do this, preserving the attributes of the shapefiles? Any pointers greatly appreciated. TIA, Chris _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users ----------------------------------------- The substance of this message, including any attachments, may be confidential, legally privileged and/or exempt from disclosure pursuant to Massachusetts law. It is intended solely for the addressee. If you received this in error, please contact the sender and delete the material from any computer. _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
