Topic: solar
| Tool | Description |
|---|---|
| r.horizon | 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. |
| r.sun | Computes direct (beam), diffuse and reflected solar irradiation raster maps for given day, latitude, surface and atmospheric conditions. Solar parameters (e.g. sunrise, sunset times, declination, extraterrestrial irradiance, daylight length) are saved in the map history file. Alternatively, a local time can be specified to compute solar incidence angle and/or irradiance raster maps. The shadowing effect of the topography is optionally incorporated. |
| r.sunhours | Solar elevation: the angle between the direction of the geometric center of the sun's apparent disk and the (idealized) horizon. Solar azimuth: the angle from due north in clockwise direction. |
| r.sunmask | Either exact sun position (A) is specified, or date/time to calculate the sun position (B) by r.sunmask itself. |
See also the corresponding keyword for additional references:
solar
- r.sun - Computes direct (beam), diffuse and reflected solar irradiation raster maps for given day, latitude, surface and atmospheric conditions. Solar parameters (e.g. sunrise, sunset times, declination, extraterrestrial irradiance, daylight length) are saved in the map history file. Alternatively, a local time can be specified to compute solar incidence angle and/or irradiance raster maps. The shadowing effect of the topography is optionally incorporated.
- r.sun.daily - Runs r.sun for multiple days in loop (mode 2)
- r.sun.hourly - Runs r.sun in loop for given time range within one day (mode 1 or 2)
- r.sunmask - Either exact sun position (A) is specified, or date/time to calculate the sun position (B) by r.sunmask itself.