Quickdraw

Emergency landing site analysis

D= m
Max slope °
Min area m²
Power-line buffer m
Swaps only the vector features (roads, water, land-cover, hedges, sites). Terrain (LIDAR), NDVI and the drive leg (OSM both) are unchanged — an A/B on the feature source.
Click map or enter coordinates. D value entered in metres. Max search radius 2500 m; night-mode D max 30 m.
Data pipeline
Landable (2D clear) Too close to obstacle Steep (>7°) Obstacle >1m (trees/buildings) Restricted zone Water Power line
Download KMZ
Published for EFB
Barb shaft points into the wind (°T). Half barb 5 kt, full barb 10 kt, pennant 50 kt. Sun and Moon sit on their true bearing round each site, labelled with height above the horizon; faded means below it.
Candidates