Estimates of Local Sky Obstruction (Regions of Problematic GPS Reception)

Some possible approaches

  • (see image below and attached script)
       r.mapcalc "$GIS_OPT_output = atan( ($GIS_OPT_elev - $z) / sqrt( (x() - $x)^2 + (y() - $y)^2) )"

Angle Map: Vertical angle (degrees) from starting point (yellow point) to each cell.

  • Compute percent of visible terrain that is above 10 degrees vertical elevation at each cell, using r.los.


Percent of visible terrain obscuring the sky above 10 degrees