Rockfall Simulator

Lumped-mass trajectory analysis over a DTM

1 · Digital terrain model

or reuse an already-uploaded DTM

Nodata value

Blank auto-detects an undeclared fill plateau — a constant value covering much of the grid, far below any real ground. Set it explicitly if the guess is wrong, or type the real elevation of a genuinely flat area to keep it.

Grid resolution (px) 3D mesh detail (px)

Grid resolution sets the simulation cell size — your DTM is resampled to it, it is not the file's native pixel size. Scar depth is block volume ÷ cell area, so halving the cell size quadruples it. Cost rises roughly with the square.

2 · Area of interest

Click on the terrain to place polygon corners around the unstable face. Rocks are released only inside it — they still run out beyond it.

Defaults are literature placeholders — replace with site-specific values (field survey, back-analysis) when available.

Orbit

Choose a DTM GeoTIFF to begin.