Satellite Imagery
Ground Sample Distance: What GSD Does and Doesn't Tell You
Ground sample distance explained: what GSD measures, how off-nadir angle stretches it, and why the pixel size says nothing about where the pixel sits.
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Satellite Imagery
How to Buy Hyperspectral Satellite Imagery in 2026
How to buy hyperspectral satellite imagery in 2026: what is for sale, at what resolution and band count, what it costs, and what actually arrives.
Satellite Imagery
High-Resolution Satellite Imagery: What You Can See in 2026
High-resolution satellite imagery explained: what 30 cm, 50 cm, 1 m and 10 m pixels actually show, which satellites deliver each, and what it costs.
Remote Sensing Research
Backpropagating Through a Flood
We calibrated the sediment physics of our Bhote Koshi flood model by gradient descent through the full shallow-water solver, against terrain change measured from stereo satellite imagery. It worked, after three instructive failures.