VISIBILITY
STREAM is viewshed analysis software that computes visibility directly on your DEM. Place an observer and see exactly which ground is visible and which is hidden, or check whether an obstacle blocks the line of sight between two points.
A viewshed is the area of terrain visible from a given observer point, computed from the elevation surface. Line-of-sight is the related question of whether two specific points can see each other.
Both are essential for telecom siting, surveillance, planning, and any task where visibility over terrain matters.
See visible and hidden ground from a selected observer, as a clear color overlay on the terrain. Set the observer's height above ground (1–30 m) and an optional maximum search radius.
Check instantly whether an obstacle blocks the line between two points, with independent observer and target height offsets and an earth-curvature-and-refraction correction for long lines of sight.
Visibility is computed from the real elevation surface you loaded, at the DEM's own resolution, so results reflect the actual terrain.
Keep the viewshed as a live overlay or export it as raster or vector.
Draw or select the area the visibility is computed inside.
Put the observer point on the terrain and enter its height above the ground — a camera mast, a tower, or eye height.
Enter the radius the analysis reaches and the target height that has to be visible.
Visible and hidden ground is painted over the terrain. For a single pair of points, the line-of-sight profile shows exactly where the obstruction is.
Add the viewshed as a layer, or export it as a raster or a vector for the report.
See which ground is visible or hidden from an observer point, and check line-of-sight between two points — computed directly on the DEM.
Yes. Viewshed and line-of-sight are standard tools for antenna siting, surveillance coverage and planning over terrain.
Yes. Results can be kept as a live overlay or exported as raster or vector for reports and GIS.
Free beta for Windows x64. Works fully offline with GeoTIFF, LAS/LAZ and DXF.
Download STREAM free