IMERG Land-Sea Mask Binary
This file is the percent water surface coverage file used for the IMERG products in binary format. It is on a 0.1°x0.1° grid as REAL*4 (3600,1800). The orientation is the same as the IMERG data. The file displays percent water surface coverage with 100% = all water and 0% = all land.
Land sea is also called land ocean or land water. Typical percentage thresholds used to define sea are 100% (strictly open water) or 75% (including sea-ward coast areas). Typical percentages used to define strictly land are 25% or 15%; too low a percentage masks out humid regions that have many lakes and reservoirs. Users should inspect the resulting masks to check that they correspond to the expected map.
Binary file written in Fortran as IEEE big-endian REAL*4 (3600,1800). The upper left-hand corner of the first grid box is at (90°N , 0°E) with longitude being the most rapidly varying index.
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