MISR Regional SAMUM File Format

The MISR regional products are in HDF-EOS format. Tools and other information about HDF-EOS are available from the Hierarchial Data Format page.

Detailed information about the format of the MISR Regional files can be found in the Data Products Specifications document. However, if you are using a HDF-EOS aware tool (e.g., IDL, HDF-EOS library), you will need to know little more than the HDF-EOS grid and HDF-EOS field names.

Note that the MISR Regional data are map projected as described on the Map Projection page.

**Brief Regional Product Descriptions** (See Data Products Specifications for complete details.)
Component Global Georectified Radiance Product (CGGRP): MI3DRDR, MI3MRDR, MI3QRDR
Grid	Field	Data type	Description
GeorectifiedRadianceAverage	Average	FLOAT32 -9999 = fill	This is the average radiance value, in W m^-2 sr^-1 µm^-1. This is indexed by y, x, camera, band. Camera has 0 = DF, 1 = CF, 2 = BF, 3 = AF, 4 = AN, 5 = AA, 6 = BA, 7 = CA, 8 = DA. Band is 0 = Blue (443 nm), 1 = Green (555 nm), 2 = Red (670 nm), 3 = Infrared (865 nm).
GeorectifiedRadianceAverage	Average count	INT32	This is the count of radiances used in the Average field. This has the same indices as Average.
GeorectifiedRadianceCovariance	Covariance	FLOAT32 0 = fill	This is the variance and covariance between the radiances, in the units W² m^-4 sr^-2 µm^-2. This contains only the lower triangular part of the symmetric covariance matrix. This is indexed by x, y, and a covariance index. For the covariance index, 0 = Variance of the DF Blue, 1 = Covariance of the DF Blue and DF Green, 2 = Variance of DF Green, and so on.
GeorectifiedRadianceCovariance	Covariance count	INT32	This is the count of the radiance pairs that are used in the Covariance. This has the same indices as Covariance.
Component Global Aerosol Product (CGAS): MI3DAER, MI3MAER, MI3QAER
Grid	Field	Data type	Description
AerosolParameterAverage	Optical depth average	FLOAT32 -9999 = fill	Average of the aerosol optical depth. This is for the green (555 nm) band. This is indexed by y, x.
AerosolParameterAverage	Optical depth average count	INT32	Count of optical depths used in the Optical depth average.
Component Global Land Surface Product (CGLS): MI3DLSR, MI3MLSR, MI3QLSR
Grid	Field	Data type	Description
LandParameterAverage	DHR average	FLOAT32 -9999 = fill	Average of DHR (Directional Hemispheric Reflectance). Defined as radiance exitance divided by irradiance under illumination from a single direction. Also know as the "black sky" albedo. This is indexed by y, x, and band. Band is 0 = Blue (443 nm), 1 = Green (555 nm), 2 = Red (670 nm), 3 = Infrared (865 nm).
	DHR average count	INT32	Count of DHR values used in DHR average. Same indices as DHR average.
	DHRPAR average	FLOAT32 -9999 = fill	Average of DHR integrated over the Photosynthetically Active Radiation (PAR) band.
	DHRPAR average count	INT32	Count of DHRPAR values used in DHRPAR average. Same indices as DHRPAR average.
	DHR Shortwave approximation average	FLOAT32 -9999 = fill	Average of DHR for a broad shortwave band (400 - 2500 nm), approximated from visible bands. This is indexed by y, x.
	DHR Shortwave approximation average count	INT32	Count of DHR Shortwave approximation values used in DHR Shortwave approximation average. Same indices as DHR Shortwave approximation average.
	FPAR average	FLOAT32 -9999 = fill	Average of Fractional absorbed Photosynthetically Active Radiation (FPAR). Defined as PAR irradiance absorbed by live vegetation divided by incident PAR irradiance. This is indexed by y, x.
	FPAR average count	INT32	Count of FPAR values used in FPAR average. Same indices as FPAR average.
	LAI average	FLOAT32 -9999 = fill	Average of Leaf Area Index (LAI). This is indexed by y, x.
	LAI average count	INT32	Count of LAI values used in LAI average. Same indices as LAI average.
	NDVI average	FLOAT32 -9999 = fill	Average of Normalized Difference Vegetation Index (NDVI). This is indexed by y, x.
	NDVI average count	INT32	Count of NDVI values used in NDVI average. Same indices as NDVI average.