@incollection{huldGRASSGISManual2013,
  title = {{{GRASS GIS}} Manual: R.Horizon},
  booktitle = {{{GRASS}}\hspace{0.6em}{{Development}}\hspace{0.6em}{{Team}}, 2013. {{GRASS GIS}} 6.4.3svn {{Reference Manual}}},
  author = {Huld, Thomas and Cebecauer, Tomas and Hofierka, Jaroslav and Suri, Marcel},
  date = {2013},
  publisher = {{Open Source Geospatial Foundation}},
  location = {{USA}},
  url = {http://grass.osgeo.org/grass64/manuals/r.horizon.html},
  abstract = {r.horizon - Horizon angle computation from a digital elevation model. Computes horizon angle height from a digital elevation model. The module has two different modes of operation: 1. Computes the entire horizon around a single point whose coordinates are given with the 'coord' option. The horizon height (in radians). 2. Computes one or more raster maps of the horizon height in a single direction. The input for this is the angle (in degrees), which is measured counterclockwise with east=0, north=90 etc. The output is the horizon height in radians.},
  keywords = {*imported-from-citeulike-INRMM,~INRMM-MiD:c-13366801,computational-science,free-scientific-software,free-software,gis,grass-gis,grass-gis-manual,gridded-data,spatial-spread}
}

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