Shows the percentage of time surface water was detected at each location over the period 1984-2021. The layer is derived from the JRC Global Surface Water dataset (Pekel et al. 2016) served on Google Earth Engine at 30 m native resolution. Values range from 0% (water rarely or never observed) to 100% (permanent water), so higher values mark stable water bodies while intermediate values indicate seasonal or intermittent water.
This layer quantifies how frequently surface water was present at each pixel across nearly four decades of satellite observation. It reads the occurrence band of the JRC Global Surface Water image, a single pre-computed layer built from the full Landsat archive (1984-2021), where each pixel stores the fraction of valid observations in which water was detected, expressed as a continuous value from 0 to 100%.
| Code | Provider | Resolution | Year |
|---|---|---|---|
| JRC/GSW1_4/GlobalSurfaceWater | JRC (EC) via Google Earth Engine | 30 m | 1984-2021 |
The occurrence band is loaded from Google Earth Engine, clipped to the area of interest and downloaded as a raster; pixels are then rendered on a continuous yellow-to-blue gradient (0% = no/rare water, 100% = permanent water). For each area, the layer reports the minimum, maximum and mean occurrence over valid pixels.