SRTM | C Band (3 arc second)

SRTM C Band (3 arc second)

Free

Provider: NASA / USGS
Mission Date: February 11–22, 2000
Instrument: C-band Interferometric Synthetic Aperture Radar (InSAR)

Specification

Coverage Area Global (between ~60°N to 56°S)

Spatial Resolution 3 arc-second (~90 meters at the equator)

Vertical Accuracy ±16 m (absolute), ±6 m (relative); varies by terrain and vegetation

Horizontal Datum WGS 84 (EPSG:4326)

Vertical Datum EGM96 geoid

File Format GeoTIFF, HGT (raw), BIL, or ASCII Grid

Tile Size 1° x 1°

Depth/Elevation Units Meters above mean sea level (positive values only)

Data Type 16-bit signed integer

Acquisition Method Interferometric SAR using dual antennas aboard Space Shuttle Endeavour

Data Voids Present in steep or heavily vegetated terrain (patched in post-processing)

Data Sources Raw radar interferometry from C-band (5.6 cm wavelength)

Access / Licensing Public domain, available via USGS EarthExplorer and NASA portals