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if the feature that need to be merged have a common attribute value (or if they all need to be merged), then you can use the dissolve tool (exists both in ArcGIS Data management -> Generalization -> Dissolve) and QGIS vector ->geoprocessing tools --> dissolve). In ArcGIS, there is an option to create (or not) multipart polygons. In QGIS you get multipart ...


3

You could use the arcpy.Geometry() object's .union() method: >>> g1, g2 = [f[0] for f in arcpy.da.SearchCursor("BufferedPoints","SHAPE@")] >>> g1 <Polygon object at 0x1929f830[0x1929f920]> >>> g2 <Polygon object at 0x1929f730[0x1929f440]> >>> g3 = g1.union(g2) >>> ...


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I spend a lot of time working on fantasy maps, currently I am working on several large shapefiles/geodatabases which in combination cover the whole of northern Africa. I have had a lot of trouble running that much data in ArcGIS Pro, but ArcMap on the other hand, gives me no trouble at all working on such a large dataset. I would suggest working with ArcMap ...



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