The Global Surface Water dataset was developed by the European Commission's Joint Research Centre in the framework of the Copernicus Programme. It maps the location and temporal distribution of water surfaces at the global scale over the past 3.8 decades and provides statistics on their extent and change. It is provisioned as a global tiled raster resource available for all land areas. The reported data represent aggregated observations between 1984 - 2021.
Details
GSW transition data contains information about the type of surface water
change for each pixel. The raster files have integer cell values between
[0, 10] that code for different transition classes:
| Value | Transition Class |
| 1 | Permanent |
| 2 | New Permanent |
| 3 | Lost Permanent |
| 4 | Seasonal |
| 5 | New Seasonal |
| 6 | Lost Seasonal |
| 7 | Seasonal to Permanent |
| 8 | Permanent to Seasonal |
| 9 | Ephemeral Permanent |
| 10 | Ephemeral Seasonal |