The light pollution map has two base layers (road and hybrid Bing maps), light pollution overlays and the user light pollution measurements overlay.
To add your SQM measurements turn on the "User SQM data" layer and click on the pencil icon. You can also display only measurements within a specified date range using the date selector bar.

The light pollution 2010 overlay was made from "Version 4 DMSP-OLS Stable Lights Coverage".
The light pollution 2014, 2015, 2016 overlays were made from "VIIRS DNB Cloud Free Composites".
Data from 2010 and 2014/2015/2016 is not comparable (different satellite systems)!!!

Data courtesy of Earth Observation Group, NOAA National Geophysical Data Center.
For more info view the FAQ. Send comments about the map to Jurij Stare