Two products were used to classify Water (i.e., lakes, large rivers,
and ocean). First, Fmask layers for all Landsat 7 scenes obtained
(1999–2013) were utilized, andWater was classified ifwater was present
in any one of the input layers. Also, we generated a custom NDWI
based on Eq. (2),where Green=band 2 reflectance and NIR=near-infrared
(band 4) reflectance.