Inland surface water
Areas of permanent and seasonal surface inland water and their changes over time (1984 - 2018) are expressed in km2 and percentages.
| Area (km2) of permanent surface water (2018) |
Area (km2) of seasonal inland water (2018) |
Net change (km2) of permanent surface water (2018 – 1984) |
Net change (km2) of seasonal inland water |
Net change (%) of permanent surface water (2018 – 1984) |
Net change (%) in surface area of seasonal inland water |
Water Occurrence (1984-2018)
>0%
100%
Sometimes Water
Always Water
The Water Occurrence dataset shows where surface water occurred between 1984 and 2018 and provides information concerning overall water dynamics. This product captures both the intra and inter-annual variability and changes. The occurrence is a measurement of the water presence frequency (expressed as a percentage of the available observations over time actually identified as water). The provided occurrence accommodates for variations in data acquisition over time (i.e. temporal deepness and frequency density of the satellite observations) in order to provide a consistent characterization of the water dynamic over time.
Water Occurrence Change Intensity (1984-1999 to 2000-2018)
Decrease
No Change
Increase
The Water Occurrence Change Intensity product shows where surface water occurrence increased, decreased or remained invariant between 1984 and 2018. Both the direction of change (i.e. increase, decrease or no change) and its intensity are documented. The occurrence change accommodates for variations in data acquisition over time (i.e. temporal deepness and frequency density of the satellite observations) in order to provide a consistent occurrence change measurement.
Water Transitions (1984-2018)
| Permanent |
|
| New Permanent |
|
| Lost Permanent |
|
| Seasonal |
|
| New Seasonal |
|
| Lost Seasonal |
|
| Seasonal to Permanent |
|
| Permanent to Seasonal |
|
| Ephemeral Permanent |
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| Ephemeral Seasonal |
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The Water Transitions map documents changes in water state between the first year and the last year of observation.
