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Grids & Mapping

Product Grid 

The MODIS Water Vapor (MOD05_L2) product contains data that has a spatial resolution (pixel size) of 1 x 1 kilometers (at nadir) or 5 x 5 kilometers (at nadir). Each MOD05_L2 product file covers a five-minute time interval (based on the start time of each MODIS Level-1B granule), which means the MOD05_L2 output grid is 1350 1-km pixels in width and 2030 1-km pixels in length (or 270 by 406 5-km pixels) for nine consecutive granules. Every tenth granule has an output grid size of 1350 by 2040 pixels (or 270 by 408).

Granule Coverage 

The image below depicts MODIS Level-2 granule coverage during a single simulated orbit. Twenty consecutive granules are depicted. It should be noted that a granule of Level-2 MODIS data is defined as a single Level-2 MODIS product HDF file.


MODIS Level-2 Granule Coverage
MODIS level 2 granule coverage GIF animation
Created by Li & Hubanks

Computation of Geolocation in 5-km L2 Products

The geolocation in the 05_L2 MODIS product is at 5-km resolution. This geolocation is generated from 5x5 1-km L1B input and is copied from center (3,3) 1-km L1B input pixel in each 5x5-km area.

5-km geolocation computation image