Update README.md

README.md

@@ -13,4 +13,8 @@ The dataset is released under [CC BY 4.0](https://creativecommons.org/licenses/b
 - [Landsat 8/9 OLI-TIRS imagery](https://www.usgs.gov/centers/eros/science/usgs-eros-archive-landsat-archives-landsat-8-oli-operational-land-imager-and) from NASA/USGS, [public domain](https://www.usgs.gov/centers/eros/data-citation?qt-science_support_page_related_con=0#qt-science_support_page_related_con)
 - The [USDA Cropland Data Layer](https://www.nass.usda.gov/Research_and_Science/Cropland/SARS1a.php) from USDA, public domain
 - [ERA5 monthly reanalysis data from ECMWF](https://cds.climate.copernicus.eu/datasets/reanalysis-era5-single-levels-monthly-means), available under [CC-BY](https://spdx.org/licenses/CC-BY-4.0)
-- [OpenStreetMap vector data](https://www.openstreetmap.org/), available under [ODbL](https://www.openstreetmap.org/copyright)
+- [OpenStreetMap vector data](https://www.openstreetmap.org/), available under [ODbL](https://www.openstreetmap.org/copyright)
+- [Shuttle Radar Topography Mission (SRTM)](https://www.usgs.gov/centers/eros/science/usgs-eros-archive-digital-elevation-shuttle-radar-topography-mission-srtm-1) Digital Elevation from USGS, public domain.
+- [WorldCereal 2021](https://esa-worldcereal.org/en/products/global-maps) cropland map from ESA, available under [Creative Commons Attribution 4.0 International](https://creativecommons.org/licenses/by/4.0/).
+- [WorldCover 2021](https://esa-worldcover.org/) land cover map from ESA, available under [Creative Commons Attribution 4.0 International](https://creativecommons.org/licenses/by/4.0/).
+- [WRI Canopy Height Maps](https://dataforgood.facebook.com/dfg/tools/canopy-height-maps) from World Resources Institute and Meta, available under [Creative Commons Attribution 4.0 International](https://creativecommons.org/licenses/by/4.0/).