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
Geometric Correction and Orthorectification of Satellite Imagery
Why raw satellite images are geometrically distorted and how orthorectification corrects them using sensor models, ground control points, and digital elevation models. Covers the difference between georeferencing, geocoding, and orthorectification.
2026-02-06 · 7 min read
Digital Elevation Models Compared: SRTM, ALOS, Copernicus DEM, and When to Use Each
A practical comparison of freely available global DEMs — SRTM, ALOS World 3D, Copernicus DEM, and NASADEM. Covers resolution, accuracy, artifacts, and which DEM suits which application.
2025-11-16 · 8 min read