DEM
3 articlesLayover and Shadow: How Much of a SAR Scene Is Actually Usable?
In relief, a large share of a SAR scene can be unmeasurable before you look at it. The geometry is arithmetic — slope against incidence angle — so it can be computed for a specific pass instead of guessed at.
2026-08-23 · 6 min read
Orthorectification & Geometric Correction, Explained
What orthorectification and geometric correction do to satellite images, why terrain causes distortion, and how DEMs and ground control points fix it.
2026-02-06 · 7 min read
DEM Comparison: SRTM vs ALOS vs Copernicus DEM
SRTM, NASADEM, ALOS World 3D and Copernicus DEM compared: resolution, vertical accuracy, coverage and artifacts, and which free global DEM suits each task.
2025-11-16 · 8 min read