I’m trying to plot an interpolated heatmap of RSSI (received signal strength indication) point values on a static map with Python and Seaborn.
The data is in a local InfluxDB but for the sake of this question, I exported them as CSV. The CSV file and the additionally used shape file are available here: https://cloud.gofferje.net/s/BT7bJaS7ybtP8zn

I have the following code which is working well, but as all correlations in the heatmap are whole numbers, I would like the legend on the right to not be a spectrum, but just to have 4 distinct colors, matching that of the heat map.

I have a dataframe with datetime and ‘active_status’ columns.
How can I realize an heatmap with status flag on it as this image does?