If you have access to the Map 3D toolset, this is the typical workflow for a population density map:
She uses Transparency (Property: 50%) so the Red Heat layer shows through the Green Canopy layer. Where Red and Green overlap, it turns Brown—visualizing "Hot zones with old trees" vs. "Hot zones with no trees." thematic maps autocad
Lena saves the file: City_Climate_Diagnostic_vFINAL.dwg If you have access to the Map 3D