Superset & DECK.GL -- cannot display shaded polygons - gis

Question

I want to visualize Zip3 polygons, shaded by the population. I have GeoJSON formatted as text strings in a Snowflake table, and am able to visualize them using the "Deck.GL GEOJSON" map type, but not "Deck.GL Polygon", which is what I need.
I have tested the GeoJSON with geojson.io and they are valid.
This is a "Deck.GL Polygon" type and does not work (showing up blank, but with the Legend correctly displaying):
This is a "Deck.GL GEOJSON" type and which DOES work (but does not allow me to color it by population):
Any ideas how to shade these polygons in Superset?

Answer 1

Why do you need PolygonLayer instead of GeoJsonLayer? At the end GeoJsonLayer renders a SolidPolygonLayer
So, GeoJsonLayer = SolidPolygonLayer
One of the differences between rendering a GeoJsonLayer or SolidPolygonLayer is that, if your data is already a geojson format, you don't need to specify an accessor to tell deck.gl where your data coordinates are located (because internally interprets where those are => feature => geometry => coordinates)
I would go using a GeoJsonLayer, and then, for styling polygons, you will need to use getFillColor accessor like:
new GeoJsonLayer({
...,
getFillColor: ({ properties }) => {
if (properties.population > 1_000_000) {
return [255, 0, 0]
}
return [0, 255, 0]
}
})