guide:help:tools:viewshed
Table of Contents
Viewshed
Documentation | Help File | Plugins | Viewshed
Viewshed analysis for grid layer with given observers.
Precaution
- There has to be at least one grid layer in project
- There has to be at least one vector layer which contains points in project
Parameters
| Parameter | Description |
|---|---|
| Terrain layer | Terrain model as a grid layer. |
| Observer layer | Layer containing observer locations; layer is expected to contain one or more points; only first 50 points will be used. |
| Radius | Specifies the maximum distance (in meters) between the observer and the cell for the analysis to be performed; greater distance implies no visibility. |
| Terrain offset | Fixed terrain elevation offset in meters to e.g. |
| Observer offset field | Attribute field defining observers elevation offset; field value must be expressed in meters. |
| Refractivity | Specifies the refractivity coefficient of light; default is 0.13. |
| Observer offset | Fixed observers elevation offset in meters. |
| Elevation coordinate | Specifies coordinate used as elevation of the observers; default is DEM. |
| Viewshed output | Output path for viewshed analysis with default .grd extension. |
| AGL output | Output path for AGL analysis with default .grd extension. |
| Include earth curvature | If checked then the elevation of input data will be corrected for Earth curvature and refraction. |
| Fill with zeros | If checked then output is initially filled with zeros instead of NoData (default). |
| Apply default coloring | If checked then output will be colorized with default ramp |
Example of input data
Example of output data
2018/05/10 12:29