Topic: solar

       r.horizon                                                    Computes  horizon  angle  height  from  a  digital elevation
                                                                    model.

       r.sun                                                        Solar irradiance and irradiation model.

       r.sunhours                                                   Calculates solar elevation, solar azimuth, and sun hours.

       r.sunmask                                                    Calculates cast shadow areas from sun position and elevation
                                                                    raster map.

       See also the corresponding keyword solar for additional references.

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       © 2003-2018 GRASS Development Team, GRASS GIS 7.4.0 Reference Manual