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Using H3-py's h3_to_geo_boundary a WKT linestring (via shapley polygons) can be generated.

When later visualizing the hexagons, why are they distorted? How can this be fixed?

enter image description here

To my best knowledge, H3 works in EPSG:4326. As you can see on the plot, the base-map coordinate system is also set to 4326. And QGIS also interprets the CSV of WKT strings as 4326.

Why do I see the distortion? How can it be fixed?

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  • what projection did the hexagons come with or what did you set the projection of the hexagons to?
    – Ian Turton
    Nov 25 '19 at 9:13
  • I kept the default output of H3. When loading it from QGIS it was interpreted as 4326. Nov 25 '19 at 9:15
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The definition of EPSG:4326 is simply just a representation of the WGS84 coordinate system which is a 1:1 mapping from the spheroid to an XY plane.
And, while WGS84 is the correct spheroid for h3 geometries, you need a conformal map projection if you want to preserve the hexagon shapes.

Shown below is a reference image taken from QGIS using EPSG:3857.

enter image description here

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