What’s the “Bottom Line” for SRTM? (1)
SRTM = most complete, most accurate, and most detailed
SRTM = 80% of Earth’s landmass = home of 95% of Earth’s population
- GTOPO 30 ~100%, DTED 1 ~ 70%, DTED 2 < 5%
SRTM = more information:
- ~900X more posts DTED 2 vs. GTOPO 30 [30 vs 900 meters]
- ~100X more posts DTED 1 vs. GTOPO 30 [90 vs 900 meters]
- ~ 9X more posts DTED 2 vs. DTED 1 [30m vs 90 meters]
SRTM = improved quality
- Horizontal accuracy improved ~ 2X DTED 2 vs. DTED 1[~ 20 vs 50 meters]
- Vertical accuracy improved ~ 2X DTED 2 vs. DTED 1[~ 16 vs 30 meters]
SRTM = 2 complete sets of 30 m SAR orthoimage mosaics
- Ascending and descending / guaranteed “cloud free”
“Snapshot of Earth at start of 21st Century”