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Jan 22, 2019 at 23:43 comment added Gabriel De Luca The solution will be in the correct method (or methods) applied in v.clean, necessary to comply with GRASS topological rules (for example, are you breaking the lines at each intersection?). The second error seems to be related to the script. Best find all the necessary steps for the recognition of the polygons (in any dxf file) by GRASS and once you get it re-write the script.
Jan 22, 2019 at 19:05 comment added csk Ian is referring to invalid geometry, which is a concept you should read up on if you're not familiar with it. One example of invalid geometry (for a polygon feature) would be a self-intersecting polygon. It's possible that QGIS is being more particular about its geometry validity requirements, or perhaps ArcGIS is automatically correcting an invalid geometry.
Jan 22, 2019 at 18:56 history edited PolyGeo CC BY-SA 4.0
added 7 characters in body; edited title
Jan 22, 2019 at 18:22 comment added Shanaka Herath can you please explain further?
Jan 22, 2019 at 17:15 comment added Shanaka Herath what do you mean by valid?
Jan 22, 2019 at 17:00 comment added Ian Turton if your process works for most dxf files but not this one, there must be something wrong with this one. Is the polygon valid?
Jan 22, 2019 at 16:54 history edited Vince CC BY-SA 4.0
naming
Jan 22, 2019 at 16:48 comment added Shanaka Herath but a polygon was created in ArcGIS using the same dxf?
Jan 22, 2019 at 16:46 history edited Shanaka Herath CC BY-SA 4.0
added 19 characters in body; edited title
Jan 22, 2019 at 16:31 comment added Ian Turton sounds like there is a problem with that file
Jan 22, 2019 at 16:29 history edited Ian Turton CC BY-SA 4.0
formatting
Jan 22, 2019 at 16:19 history asked Shanaka Herath CC BY-SA 4.0