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CNES / slurp

Smart Land Use Reconstruction Pipeline. Various algorithms to perform land use / land cover classification
Apache License 2.0
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what‘s HAND maps? #1

Open manyy opened 1 month ago

manyy commented 1 month ago

Water model is learned from Peckel (Global Surface Water) reference data and is based on NDVI/NDWI2 indices. Then the predicted mask is cleaned with Peckel, possibly with HAND maps and post-processed to clean artefacts. what's HAND maps?

ytanguy commented 3 weeks ago

Hi,

HAND stands for "Height Above Nearest Drainage" : each pixel is a relative altitude to the nearest drainage (river,etc.). It helps the water mask algorithm to choose water (or non-water) pixels, or to clean water pixels when they are too high above the closest drainage. I use HAND MERIT maps, but you can find other maps like "Global 30-m HAND" : https://storymaps.arcgis.com/stories/fcd5cba6104645349f59e504042bacd6

In a few weeks, I'll try to push a true "getting started" section with some minimal dataset and more explanations about the algorithms.

Thanks for your interest, hope that helps !

Yannick