Understanding the World Pixel by Pixel
summary
GeoTrellis is a Scala library for low‑latency, distributed raster processing that powers interactive web services and batch pipelines; it handles a 2M×1M National Elevation Dataset (~6 TB NED) and parallelizes operations across machines. The code implements kernel density updates with caching and decay (multiply old raster by 0.9), supports map algebra (add/multiply hazard layers), uses type‑class driven data sources for metadata propagation, and underpins a travel‑time transit demo that runs in real time.
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