The author of FS Global (mesh software) writes that “…. due to the nature of SRTM in flat areas high buildings can be mistaken for hills. It is impossible to solve this issue by reworking SRTM data using a special algorithm. We therefore decided to switch data sources for North America. Instead of SRTM we will be using alternative data in future versions of FS Global. SP1Â addresses obvious issues of this nature in the area of Florida. SP1 is a free update for registered users. It can be obtained via our website …..”.