image processing
3 articlesGeometric 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
SAR Speckle Noise: What It Is and How to Filter It Without Losing Information
Understanding the granular noise pattern in SAR imagery, why it exists, and practical filtering approaches including Lee, Frost, and multi-temporal averaging. When to filter and when speckle carries useful signal.
2026-02-01 · 7 min read
Pansharpening: How to Get High-Resolution Multispectral Imagery
Pansharpening combines a high-resolution panchromatic band with lower-resolution multispectral bands to produce sharp, colorful satellite imagery. Covers Brovey, IHS, PCA, and Gram-Schmidt methods.
2026-01-13 · 8 min read