---
name: "topic_solar"
section: "1grass"
platform: "linux"
package: "grass-doc"
version: "8.4.1-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/topic_solar"
---

# topic\_solar(1grass)

## 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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