Hydros SiteReview

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As part of the internal HYDROS site review, datasets and information were determined to estimate statistics in order to evaluate the region of the globe where HYDROS would be most applicable.

The two images below are global maps of vegetation water content (kg/m2) for both maximum and minimum times of the year via satellite estimates of leaf area index (LAI). The LAI data was derived from AVHRR NDVI measurements developed at Boston University. The maps mask out land ice, water, and mountainous topography. The mountaineous topography was defined as having a slope of greater than 0.15.

The table below illustrates some of the statistics calculated during this process.

Description	Land Area (km2)	Land Area (%)
Total land area:	130282432	100.0
Maximum land area below 5kg/m2:	92262016	70.8
Minimum land area below 5kg/m2:	117930816	90.5
Non ice and water land area:	127589808	100.0
Maximum land area below 5kg/m2:	89569232	70.2
Minimum land area below 5kg/m2:	115238192	90.3
Non ice, water, and mountain land area:	112412304	100.0
Maximum land area below 5kg/m2:	77989168	69.4
Minimum land area below 5kg/m2:	100839296	89.7
Non ice and water land area:	127589808	100.0
Maximum land area below 5kg/m2 AND slope < 15% :	77989168	61.1
Minimum land area below 5kg/m2 AND slope < 15% :	100839296	79.0

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LDAS Web Page Developed and Maintained at NASA/GSFC

Matthew Rodell: Matthew.Rodell-at-nasa.gov Brian Cosgrove: Brian.Cosgrove-at-gsfc.nasa.gov