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Geographic Information Systems

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  • Which polygon in that file is it? And how did you create those lines? Commented Jan 14, 2021 at 18:08
  • The folder contains shapefile of the polygons. In the attribute table, the main_angle field is calculated using main_angle function in QGIS 3.16. The line is drawn using centroid of each polygon and the main angle. main_angle Returns the main angle of a geometry (clockwise, in degrees from North), which represents the angle of the oriented minimal bounding rectangle which completely covers the geometry Commented Jan 14, 2021 at 18:16
  • You may use principal component analysis (PCA). Scikit-learn Python package has a PCA function. See: doc.ic.ac.uk/~dfg/ProbabilisticInference/old_IDAPILecture14.pdf Commented Jan 15, 2021 at 7:38
  • @Zoltan The final results I am seeking is the average main angle of orientation of the polygons collectively which visually approximates to 30 degrees. Commented Jan 15, 2021 at 7:50
  • The first eigenvector gives the direction of the first principal direction. See: scikit-learn.org/stable/auto_examples/cross_decomposition/… Commented Jan 15, 2021 at 8:16