NISAR
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
When Can a Satellite Next Image This Place? Pass Prediction, Explained
How satellite access windows are predicted from public orbital elements, why a predicted window is not a guaranteed image, and how to decide between waiting for a free systematic pass and paying to task a commercial one.
2026-08-23 · 7 min read
NISAR L-Band SAR vs Sentinel-1 C-Band: When Does Wavelength Decide the Answer?
NISAR's L-band radar has a 24 cm wavelength against Sentinel-1's 5.55 cm. That single difference changes what the radar sees under vegetation, how coherence behaves, and which sensor answers your question.
2026-08-03 · 8 min read