Geographic Information Systems Asked on March 5, 2021
I have a csv file with the positions (x and y) outlining multiple complex polygons. Each point is numbered in a separate field and each polygon is numbered in a separate field. I can load those points into QGIS easily but I cant convert them into distinct polygons. I know there are multiple similar questions but nothing works – convex hull crashes and minimum bounding geometry is too basic. I havent found a distinct package either (im using QGIS 3.14.16).
I dont know. I can I transform a list of points into multiple polygons ? Should be easy but its not.
Import your points using Import -> Delimted text option. Then run Vector Creation -> Points to path using your point id field for the "Order field" and your polygon id field as the "Group field". You can check "close path" if you wish. Then run Vector -> Geometry tools -> Lines to polygons, which will create a separate polygon from each line. You may, of course, find that some of the generated polygons are invalid geometries with overlapping sides, in which case you can run the Check Validity tool in the Processing toolbox.
Correct answer by Leigh Bettenay on March 5, 2021
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