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HEC-HMS part 4/8 Finding the Land Cover and estimating the Curve Number for each subbassin

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Andrea Cippa / Siteplanner / WASH

Links:
Land Cover for Europe, Corine Land Cover
https://land.copernicus.eu/paneurope...

Land Cover for the whole world, Esri 2020 Land cover downloader, based on Sentinel2
https://www.arcgis.com/apps/instant/m...

Land Cover based on the European Space Agency (ESA) release (October 2021) a freely accessible global land cover product at 10 m resolution for 2020, based on both Sentinel1 and Sentinel2
https://esaworldcover.org/en
Web Map Services
WMTS: https://services.terrascope.be/wmts/v2
WMS: https://services.terrascope.be/wms/v2
Layer: WORLDCOVER_2020_MAP


CN table:
https://www.hec.usace.army.mil/conflu...

Script for creation of column in qGis
For soil type column
CASE WHEN DN = 1 THEN 'Water'
WHEN DN = 2 THEN 'Trees'
WHEN DN = 3 THEN 'Grassland'
WHEN DN = 4 THEN 'Wetland'
WHEN DN = 5 THEN 'Crops'
WHEN DN = 6 THEN 'Scrubland'
WHEN DN = 7 THEN 'Urban'
WHEN DN = 8 THEN 'Bare ground'
WHEN DN = 9 THEN 'SnowIce'
ELSE 'Cloud' END

For CN column
CASE WHEN DN = 1 THEN 100
WHEN DN = 2 THEN 73
WHEN DN = 3 THEN 79
WHEN DN = 4 THEN 80
WHEN DN = 5 THEN 74
WHEN DN = 6 THEN 70
WHEN DN = 7 THEN 79
WHEN DN = 8 THEN 91
WHEN DN = 9 THEN 100
ELSE '100' END

You need to adapt the CN based on your area/condition/soil type

If you prefer to develop the land cover map on your own, you can use the powerful qGis plugin "Mapflow" that will help you to identify different land cover typologies.
https://plugins.qgis.org/plugins/mapf...

posted by ldebbola8