Digital Elevation Models
ELVIS Elevation Data: How to Get Australian LiDAR and DEMs
ELVIS elevation data explained: what Australia's national portal holds, how to order LiDAR and DEMs, which states charge, and the AHD datum trap.
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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.
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.