You can do this kind of thing yourself with a $10 rtlsdr dvbt dongle, NMEA GPS, laptop and various software. The most commonly used is Eartoearoak's rtlsdr-scanner: http://eartoearoak.com/software/rtlsdr-scanner

NW0W has also done a lot of work on mapping powerline interference with rtlsdr dongles in multiple blog posts. An older represenative example is at: http://blog.dxers.info/2015/01/driveby-system-live-on-road.h...

tautology2 showed his visualization implementation + code over at: https://www.reddit.com/r/RTLSDR/comments/2hbjyt/gsm_heatmap_...