Activate elevation data
Use HGT, DEM GeoTIFF, ASC or DTED data that covers the observation point and radius. A normal base map is not enough, and GeoPackage DEM is not supported as a terrain source.
Manual
ViewRange and terrain visibility
ViewRange calculates which terrain within a selected radius may be visible from an observation point. It evaluates a full circle, not one chosen direction.
Workflow
Calculate and store a ViewRange
An active, supported elevation source is required in the current map context.
Choose settings
Open Tools → ViewRange and select a radius from 1 to 10 km, Fast, Standard or High quality and a display colour.
Set the observation point
Tap the map or use the current GPS position. The calculation samples terrain rays in every direction.
Watch progress
MapTools prepares elevation cells and sight rays. When cancelling, an available partial result can be retained or the temporary ViewRange deleted.
Inspect the result
Check origin elevation, visible sectors and elevation coverage. Partial elevation coverage means that the result is incomplete.
Save or export
Save the result as an editable project object, adjust the observer height from the 1.7 m default when needed, recalculate it or export a PNG.
Accuracy and limits
Terrain data is not real-world visibility
Vegetation, buildings, weather, observer height and the resolution or age of elevation data can change what is actually visible.
ViewRange is an orientation aid, not an official or safety-critical line-of-sight certificate. Higher quality and larger radii also require more time, memory and battery.
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