Update README.md

README.md

@@ -36,6 +36,12 @@ Contains a global coverage of Sentinel-2 (Level 1C) patches, each of size 1,068
 | B12 | SWIR, 2202.4 nm (S2A), 2185.7 nm (S2B) | 20m | 
 | thumbnail | RGB composite [B04, B03, B02] saved as png | 10m | 
 
+## Spatial Coverage
+This is a global monotemporal dataset. Nearly every piece of Earth captured by Sentinel-2 is contained at least once in this dataset (and only once, excluding some marginal overlaps).
+
+The following figure demonstrates the spatial coverage (only black pixels are absent):
+![image/png](https://cdn-uploads.huggingface.co/production/uploads/6304c06eeb6d777a838eab63/2KTarfsM0a1dNYEbXriUH.png)
+
 ## Example Use
 
 Interface scripts will be released soon.