GSW LEGENDS
Transitions
Permanent
New Permanent
Lost Permanent
Seasonal
New Seasonal
Lost Seasonal
Seasonal to Permanent
Permanent to Seasonal
Ephemeral to Permanent
Permanent to Ephemeral
Occurance
The frequency (% of months) with which water was present on the surface from March 1984 to October 2015
100%
1%
Change
Where surface water occurrence increased, decreased or remained the same between 1984-1999 and 2000-2015.
-100% loss
No change
100% increase
Seasonality
The number of months that water was present from October 2014 to October 2015
12 months of water
1 month of water
Recurrence
The frequency with which water returns from years to year expressed as a percentage
100% recurrence
1% recurrence
Extent
Maximum Water Extent, water detected between 1984 and 2015
Water detected
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DATA
NGD Orthophotos
Global Surface Water
Global Forest Cover
Cropland Extent 2015
IUCN
CAWA, WWF + WCS