Using 'Select By Attributes' how can I select records from a shapefile database table where a numeric field contains the largest value. Need to use MAX function or something like that but can't get the syntax right.
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Im having a problem toggling the visibility of map layers in pyqgis (2.4). I have a simple interface, just the map canvas, no legend, and ba...
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I have a single table of over 1000 polygons in postgreSQL (with PostGIS), and I have a field "evaluation_type" that only receives ...
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I want to create a center line for a river (polygon). I thought about simply creating a new line manually, but it would be a long and imperf...
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