The night pictures taken from the International Space Station (ISS) and other NASA missions as DMSP can be used to compute light emission from ground based locations. We need a complete GIS toolkit to study correlations among the satellite images and light sources. So we can get information about individual buildings or geographical areas.
We need also a tool which can use standard OGC services to access Geographic information and Layers from other SDI (Spatial Data Infrastructure), as IDEE. The connection to spatial databases, as PostGIS, would be the last requirement.