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I ended up solving this problem after I migrated to Postgres and had some more powerful tools at hand. My solution was to simply delete extra features with identical GEOM fields - leaving one of course, and then recalculate the values from the other data was collected during fieldwork. This gave me a dataset with no spatially coincident features and ...


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Why don't you: Select the two polygons you want to intesect Enable Editing Edit-> Merge Selected Features Save edits


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When you use combine you use the binary predicate union (topological relationships). gLine = QgsGeometry.fromPolyline( [ QgsPoint(1,1), QgsPoint(2,2) ] ) gLine2 = QgsGeometry.fromPolyline( [ QgsPoint(2,3), QgsPoint(5,5) ] ) union = gLine.combine(gLine2) # union print union.exportToGeoJSON() { "type": "MultiLineString", "coordinates": [ [ [1, 1], [2, 2] ], [ ...


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I may have found why the call to SAGA:MERGESHAPESLAYERS is not working in ubuntu from QGis Regardless of my 2.0.8 syntax setting QGis generates the following line of shell script shapes_tools "Merge Shapes Layers" -MAIN "/tmp/vlayer_01.shp" -LAYERS "/tmp/vlayer_01.shp;/tmp/vlayer_02.shp" -OUT "/tmp/output.shp" When run it generates the following error: ...


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Suggest you try building a virtual raster from the DEM TIFFs: Raster -> Miscellaneous -> Build Virtual Raster (Catalog). It seems to work with your sample data. Sorry, I just had to put some hillshade on the result. N.


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It seems that there are two things going on here. First, your tiles are not seamless, in that in the areas of overlap at the edges of the tiles, the elevations are not identical. I can confirm this as I digitized several points along the overlapping area and extracted the elevations in both raster DEMs and found this: In the case of the two tiles that you ...



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