Terrain-derived analysis
Free. Two computations derived from the Copernicus DEM GLO-30, both returned from a single read. operation=sar_geometry over a bbox, with incidence_deg and look_azimuth_deg, returns the share of the area lost to LAYOVER and SHADOW, the share merely foreshortened, and the mean local incidence angle — the arithmetic behind whether radar can actually use that ground, which changes with the pass direction and must not be assumed. operation=profile between two points returns the ground along the line and a LINE-OF-SIGHT verdict including Earth curvature: where the terrain first rises above the sight line, and by how much at worst. Both state the sample spacing they were computed at, because a coarser grid reads flatter and therefore more observable than the ground is. A SURFACE model, so canopy and buildings are included. Cite the returned attribution.
Request
- Base URL: https://offnadir-delta.com
- URL: https://offnadir-delta.com/api/v1/terrain
- Auth: one of:
- HTTP bearer
- API key in header X-API-Key
Query parameters
Which computation to run.
For sar_geometry: area as "lon_min,lat_min,lon_max,lat_max" (WGS84).
For sar_geometry: sensor incidence angle. Sentinel-1 IW spans roughly 29-46 degrees.
For sar_geometry: compass bearing the sensor looks along the ground range. A right-looking descending pass looks roughly west (270).
For profile: latitude of the observer end.
For profile: longitude of the observer end.
For profile: latitude of the far end.
For profile: longitude of the far end.
For profile: eye height above the ground, default 2 m. Use the real mast or tower height when that is the question.
Response
The requested terrain computation.
Changes
No recorded changes to this operation across all 1 revision of this API.