Table 5 Elevation accuracy from spot height checks, resampling to 10×10 km grid, and mean horizontal displacement magnitude from the ICESat co-registration
From: Digital elevation model and orthophotographs of Greenland based on aerial photographs from 1978–1987
Regions by campaign year | 1978 | 1981 | 1985 | 1987 |
|---|---|---|---|---|
ATM samples | 263,725 | 138,924 | 720,788 | 37,106 |
ATM samples (<3σ) | 262,910 | 130,000 | 717,067 | 35,537 |
ATM mean (m) | 1.6 | −0.2 | 1.1 | −1.5 |
ATM median (m) | 2.0 | 0.2 | 1.0 | −2.0 |
ATM SD (SDATM) (m) | 5.1 | 10.3 | 5.4 | 8.9 |
ATM mean (m) (slope<20°) | 1.7 | −0.4 | 1.1 | −1.6 |
ATM median (m) (slope<20°) | 2.1 | 0.1 | 1.1 | −2.3 |
ATM SD (m) (slope<20°) | 4.6 | 8.8 | 4.8 | 7.8 |
10×10 km mean (m) (slope<20°) | 0.8 | 1.3 | 0.9 | −0.8 |
10×10 km median (m) (slope<20°) | 1.2 | 0.8 | 0.7 | −1.0 |
10×10 km SD (m) (slope<20°) | 4.1 | 7.8 | 4.5 | 6.6 |
