I have digital elevation models (DEM) of an area and want to calculate habitat openness.
Can anyone help calculating habitat openness from a digital elevation models (DEM)?
I tried the Package 'horizon' - cran.r (R: The R Project for Statistical Computing), but got some strange results. I'm not familiar with this type of analysis, hence I do not know the scale. I'm about to analyse habitat selection in a owl inhabiting coastal and maritime heath habitats. I have GPS-positions and want to check if the owl are more likely to stay at elevations in the terrain (place with a good overview of the landscape). The owl has a home-range of about 30 to 50 km2, the accuracy of each owl GPS position is about +/- 25 m
The two DEM files could be downloaded here: https://www.dropbox.com/sh/ct02cns54c9i1wo/AAAaAT-h-F8L-FA8npm6flFoa?dl=0