[Qgis-user] Geometry errors while polygonizing raster data

[Atharva Raykar]

Hello,

I have been trying to convert this raster data using QGIS's Polygonize
function: https://daac.ornl.gov/VEGETATION/guides/Decadal_LULC_India.html

The converted geopackage is returning many geometries with negative areas.
So much so that the data is highly inaccurate, and some categories are
having negative areas with x^10 sq. meters in magnitude.

The features basically resemble the ones I found in this stack overflow
answer: https://gis.stackexchange.com/a/243707/161470 , where the holes are
located outside the geometry and are larger than the geometry itself.

How do I troubleshoot this? Is this a bug with QGIS?

I'm using QGIS 3.14 LTS.
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