An RF heatmap is a graphical representation of RF wireless data where the values taken by variables are represented in maps as colors.
The current heatmap is computed based on the RSSI prediction model, Antenna Orientation, and AP transmit power.
https://www.cisco.com/c/en/us/td/docs/net_mgmt/prime/infrastructure/3-
0/user/guide/pi_ug/wireless-map s.html