Heatmap is a graphical representation of the density of selected phenomenon. Heatmap aggregates point data, such as customers, households, POIs, etc. into visual clusters of cold and hot spots. Hotspots indicate locations where selected phenomenon has the highest values.
It also means that it is not possible to visualise some indicators using heatmap. E.g. number of purchase or atmospheric pressure.
Once you change the visualization type to Heatmap, mouse icon switches from "hand" to "target". Hover across the heatmap displays the value of selected indicator in that specific spot in legend.
Click in the heatmap to get the value of indicator for that specific spot and its sourrounding of certain perimeter.
Click on any marker to display just the data related to it.