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I'm trying to create a heatmap on a shapefile of numerous points based on a single field in their attribute table.

The header of the attribute table is this:

Attribute table header

... and I want to make a heatmap weighted on the "frp" field from the attribute table. However, in the Heatmap (Kernel Density Estimation) settings, I cannot see the "frp" field - only the "longitude" and "latitude" values appear:

Weight from field issue

What could be wrong here?

emil
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    It looks like most of your attributes are strings not numbers, how did you import it? – Ian Turton Apr 20 '21 at 10:44
  • It was initially a CSV spreadsheet that I converted to shapefile using ogr2ogr. – emil Apr 20 '21 at 10:47
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    Does https://gis.stackexchange.com/questions/29606/changing-csv-layer-attribute-value-from-text-to-number-in-qgis help? – Ian Turton Apr 20 '21 at 10:49
  • Yep, thank you for the help. They're indeed in string format, which I overlooked, so I'll convert the data types. – emil Apr 20 '21 at 10:53

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