Update README.md

README.md

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 IceCube Neutrino Observatory
 https://dataverse.harvard.edu/dataset.xhtml?persistentId=doi:10.7910/DVN/U20MMB 
 
+James Web
+https://outerspace.stsci.edu/display/MASTDATA/JWST+AWS+Bulk+Download+Scripts#JWSTAWSBulkDownloadScripts-BulkDownloads 
+
+
+from gem 
+
+General Datasets
+
+    Google Earth Engine: https://developers.google.com/earth-engine/datasets
+    NASA Earthdata Search: https://search.earthdata.nasa.gov/
+    USGS EarthExplorer: https://earthexplorer.usgs.gov/
+    European Space Agency (ESA) Earth Observation Portal: https://www.esa.int/Applications/Observing_the_Earth
+    Radiant MLHub: https://mlhub.earth/
+
+Specific Datasets
+
+    Sentinel-2: High-resolution multi-spectral imagery from the European Space Agency's Sentinel-2 mission.   
+
+Landsat: Long-term, multi-spectral satellite imagery from NASA and the USGS.  
+MODIS: Moderate Resolution Imaging Spectroradiometer data from NASA.  
+Planet Labs Skysat: High-resolution daily imagery from Planet Labs.  
+DigitalGlobe WorldView: High-resolution imagery from DigitalGlobe.  
+RADARSAT-2: Synthetic Aperture Radar (SAR) imagery from the Canadian Space Agency.  
+
+    ALOS PALSAR: SAR imagery from the Japanese Aerospace Exploration Agency (JAXA).
+
+Data Catalogs and Platforms
+
+    AWS Registry of Open Data: https://registry.opendata.aws/
+    Microsoft Planetary Computer Data Catalog: https://planetarycomputer.microsoft.com/catalog
+    STAC Index: https://stacindex.org/
+