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NAME

i.modis.qc - Extract quality control parameters from Modis QC layers

KEYWORDS

QC, Quality Control, Surface Reflectance, Land Surface Temperature, Vegetation, Modis

SYNOPSIS

i.modis.qc
i.modis.qc help
i.modis.qc productname=string qcname=string input=name [band=integer] output=name [--overwrite] [--verbose] [--quiet]

Flags:

--overwrite
Allow output files to overwrite existing files
--verbose
Verbose module output
--quiet
Quiet module output

Parameters:

productname=string
Name of MODIS product type
Default: mod13A2
qcname=string
Name of QC type to extract
Default: modland_qa
input=name
Name of the input QC layer [bit array]
band=integer
Band number of Modis product mod09Q1=[1,2],mod09A1=[1-7], mcd43B2q=[1-7]
output=name
Name of the output QC type classification layer
Default: qc

DESCRIPTION

i.modis.qc Extracts Requested Quality Assessment flags from the following Modis products: MOD09A1, MOD09Q1, MOD11A1, MOD11A2, MOD13A2, MCD43B2. This does include MOD09A1 QA_state_500m layer (see Notes).
MOD09A1/Q1: MODLAND QA Bits. bits=[0-1]
MOD09Q1: Cloud State. bits=[2-3] 
MOD09Q1: Band-wise Data Quality 250m bits=[4-7][8-11]
MOD09A1: Band-wise Data Quality 500m bits=[2-5][6-9][10-13][14-17][18-21][22-25][26-29]
MOD09A1/Q1: Atmospheric correction bit=[12]/[30]
MOD09A1/Q1: Adjacency correction bit=[13]/[31]
MOD09Q1: Different orbit from 500m product, bit=[14]
MOD11A1: Mandatory QA Flags bits=[0-1]
MOD11A1: Data Quality Flag bits=[2-3]
MOD11A1: Emis Error Flag bits=[4-5]
MOD11A1: LST Error Flag bits=[6-7]

MOD11A2: Mandatory QA Flags bits=[0-1]
MOD11A2: Data Quality Flag bits=[2-3]
MOD11A2: Emis Error Flag bits=[4-5]
MOD11A2: LST Error Flag bits=[6-7]
MOD09A1s: Cloud State bits=[0-1]
MOD09A1s: Cloud shadow bits=[2]
MOD09A1s: Land/Water Flag bits=[3-5]
MOD09A1s: Aerosol Quantity bits=[6-7]
MOD09A1s: Cirrus detected bits=[8-9]
MOD09A1s: Internal Cloud Algorithm Flag bits=[10]
MOD09A1s: Internal Fire Algorithm Flag bits=[11]
MOD09A1s: MOD35 snow/ice flag bits=[12]
MOD09A1s: Pixel adjacent to cloud bits=[13]
MOD09A1s: BRDF correction performed bits=[14]
MOD09A1s: Internal Snow Mask bits=[15]
MOD13A2: Mandatory QA Flags 1Km bits[0-1]
MOD13A2: VI Usefulness Flag bits[2-5]
MOD13A2: Aerosol quantity Flags 1Km bits[6-7]
MOD13A2: Adjacent cloud detected 1Km bit[8]
MOD13A2: Atmosphere BRDF correction performed 1Km bit[9]
MOD13A2: Mixed clouds 1Km bit[10]
MOD13A2: Land/Water Flags 1Km bits[11-13]
MOD13A2: Possible Snow/Ice 1Km bits[14]
MOD13A2: Possible Shadow 1Km bits[15]
MCD43B2: Albedo Quality Ancillary Platform Data 1Km bits[0-3]
SDS: BRDF_Albedo_Ancillary
MCD43B2: Albedo Quality Ancillary Land/Water Data 1Km bits[4-7]
SDS: BRDF_Albedo_Ancillary
MCD43B2: Albedo Quality Ancillary Sun Zenith Angle at Local Solar Noon Data 1Km bits[8-14]
SDS: BRDF_Albedo_Ancillary
MCD43B2: Band-wise Albedo Quality Data 1Km
SDS: BRDF_Albedo_Band_Quality
bits[0-3][4-7][8-11][12-15][16-19][20-23][24-27]

NOTES

In MOD09A1: It seems that cloud related info is not filled properly in the standard QC (MOD09A1 in this module) since version 3, State-QA 500m images (MOD09A1s in this module) should be used (see Vermote et al., 2008).

TODO

Add one Day products.

SEE ALSO


MODIS Products

Vermote E.F., Kotchenova S.Y., Ray J.P.
MODIS Surface Reflectance User's Guide.
Version 1.2. June 2008.
MODIS Land Surface Reflectance Science Computing Facility.
Homepage
i.vi

AUTHORS

Yann Chemin

Last changed: $Date: 2011-01-14 14:11:41 -0800 (Fri, 14 Jan 2011) $


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