MYD13C1 Product File Specification

Version:	V6.0.0
Revision:	1.1.0
Date:		13 January 2005
ESDT:		MYD13C1
Product name:	MODIS/Aqua Vegetation Indices 16-Day L3 Global 0.05 Deg CMG
Product level:	3
PGE:		27

Point of Contact:	Andree Jacobson
                	Senior Application Systems Analyst
  			MODIS Land Team
                	Terrestrial Biophysics and Remote Sensing Group (TBRS)
  			1200 E. South Campus Drive, 429 Shantz Bldg. #38, 
                	Department of Soil, Water and Environmental Science
                	University of Arizona, Tucson, AZ 85721-0038, USA
                	Office 520-626-2086; Fax 520-621-1797
                	Andree@Ag.Arizona.EDU
	
Principal Investigator:	Alfredo Huete
			Terrestrial Biophysics and Remote Sensing Group (TBRS)
			1200 E South Campus Drive, Room 429, Shantz Bldg. #38,
			Department of Soil, Water and Environmental Science,
			University of Arizona, Tucson, AZ 85721, USA
			Office 520 621 3228; Fax 520 621 5401
			ahuete@ag.arizona.edu

Description:

This is the file specification for the 16 day MODIS VI CMG Product. The output
product have datafields for the NDVI, EVI, VI QA, reflectance data, angular
information, and spatial statistics such as mean, standard deviation, and number
of used input pixels at the 0.05 degree CMG resolution. The prodcut is produced
with the MOD13A2 (1km) product as input.  Nominally each input consists of 286
tiles which are reprojected into the geographic projection and spatially
averaged and QA filtered. This version of the algorithm works for both Terra
(MOD) and Aqua (MYD) processing, with suitable changes in the pcf files.

Descriptions of metadata attributes and SDSs are given.

Contents:

SDSs always produced:
	CMG 0.05 Deg 16 days NDVI
	CMG 0.05 Deg 16 days EVI
	CMG 0.05 Deg 16 days VI Quality
	CMG 0.05 Deg 16 days red reflectance
	CMG 0.05 Deg 16 days NIR reflectance
	CMG 0.05 Deg 16 days blue reflectance
	CMG 0.05 Deg 16 days MIR reflectance 
	CMG 0.05 Deg 16 days Avg sun zen angle
	CMG 0.05 Deg 16 days NDVI std dev
	CMG 0.05 Deg 16 days EVI std dev
	CMG 0.05 Deg 16 days #1km pix used
	CMG 0.05 Deg 16 days #1km pix +-30deg VZ
	CMG 0.05 Deg 16 days pixel reliability

ECS Metadata:
	CoreMetadata.0
	ArchiveMetadata.0
	StructMetadata.0

Notes:	(A) implies that multiple values are stored within a single array.
	A value of "Variable" indicates that this value will vary according to the granule being processed.
	"M" mean class M.
	
Name:					Data Type:	# values:	Source:		Value:
------------------------------------------------------------------------------------------------
CoreMetadata.0				PVL-STRING	1		SDPTK		Variable
LOCALGRANULEID				STRING		1		PGE		Variable
SIZEMBECSDATAGRANULE			FLOAT		1		DSS		Variable
PRODUCTIONDATETIME			DATETIME	1		PGE		Variable
DAYNIGHTFLAG				STRING		1		PGE		Variable
REPROCESSINGPLANNED			STRING		1		PGE		"further update is anticipated"
REPROCESSINGACTUAL			STRING		1		PGE		"processed once"
LOCALVERSIONID				STRING		1		PGE		Variable
SCIENCEQUALITYFLAG              	STRING		1		PGE		"Not Investigated"
SCIENCEQUALITYFLAGEXPLANATION   	STRING		1		PGE		"See http://landweb.nascom.nasa.gov/cgi-bin/QA_WWW/qaFlagPage.cgi?sat=aqua for the product Science Quality status"
AUTOMATICQUALITYFLAG			STRING		1		PGE		"Pass"
AUTOMATICQUALITYFLAGEXPLANATION		STRING		1		PGE		"No automatic quality assessment is performed in the PGE"
OPERATIONALQUALITYFLAG          	STRING		1		PGE		"being investigated"
OPERATIONALQUALITYFLAGEXPLANATION 	STRING		1		PGE		Variable
QAPERCENTMISSINGDATA			INTEGER		1		PGE		Variable
QAPERCENTOUTOFBOUNDSDATA		INTEGER		1		PGE		Variable
QAPERCENTCLOUDCOVER			INTEGER		1		PGE		Variable
QAPERCENTINTERPOLATEDDATA		INTEGER		1		PGE		Variable
PARAMETERNAME				STRING		1		PGE		Variable
VERSIONID				STRING		1               MCF		"6"
SHORTNAME				STRING		1		MCF		"MOD13C1"
INPUTPOINTER				STRING		< 460		PGE		Variable (A)
WESTBOUNDINGCOORDINATE			DOUBLE		1		PGE		-180.0
NORTHBOUNDINGCOORDINATE			DOUBLE		1		PGE		  90.0
EASTBOUNDINGCOORDINATE			DOUBLE		1		PGE		 180.0
SOUTHBOUNDINGCOORDINATE			DOUBLE		1		PGE		 -90.0
RANGEBEGINNINGDATE			DATE		1		PGE		Variable
RANGEBEGINNINGTIME			TIME		1		PGE		Variable
RANGEENDINGDATE				DATE		1		PGE		Variable
RANGEENDINGTIME				TIME		1		PGE		Variable	
PGEVERSION				STRING		1		PGE		"6.0.0" or Variable

ASSOCIATEDSENSORSHORTNAME		STRING		1		MCF		"MODIS"
ASSOCIATEDPLATFORMSHORTNAME		STRING 		1		MCF		"Aqua"
ASSOCIATEDINSTRUMENTSHORTNAME		STRING 		1		MCF		"MODIS"

**Product Specific Attributes (PSA)**
ADDITIONALATTRIBUTENAME.1 		M		1		PGE		QAPERCENTGOODQUALITY
PARAMETERVALUE.1			STRING		1		PGE		Variable
ADDITIONALATTRIBUTENAME.2 		M		1		PGE		QAPERCENTOTHERQUALITY
PARAMETERVALUE.2			STRING		1		PGE		Variable
ADDITIONALATTRIBUTENAME.3		M		1		PGE		QAPERCENTNOTPRODUCEDCLOUD
PARAMETERVALUE.3			STRING		1		PGE		Variable
ADDITIONALATTRIBUTENAME.4		M		1		PGE		QAPERCENTNOTPRODUCEDOTHER
PARAMETERVALUE.4			STRING		1		PGE		Variable
ADDITIONALATTRIBUTENAME.5		M		1		PGE		NDVICMG16DAYQCLASSPERCENTAGE
PARAMETERVALUE.5			STRING		1		PGE		Variable
ADDITIONALATTRIBUTENAME.6		M		1		PGE		EVICMG16DAYQCLASSPERCENTAGE
PARAMETERVALUE.6			STRING		1		PGE		Variable

Name:					Data Type:	# values:	Source:		Value:
------------------------------------------------------------------------------------------------
ArchiveMetadata.0			PVL-STRING	1		SDPTK		Variable
SPSOPARAMETERS				STRING		4		MCF		"2749", "4334", "2749a", "4334a"
ALGORITHMPACKAGEACCEPTANCEDATE		STRING		1		PGE		"2004-10-01" (or Variable)
ALGORITHMPACKAGEMATURITYCODE		STRING		1		PGE		"Normal" (or Variable)
ALGORITHMPACKAGENAME			STRING		1		PGE		"MOD_PR13C1" (or Variable)
ALGORITHMPACKAGEVERSION			STRING		1		PGE		"6" (or Variable)
INSTRUMENTNAME				STRING		1		MCF		"Moderate-Resolution Imaging SpectroRadiometer"
LONGNAME				STRING		1		MCF		"MODIS/Aqua Vegetation Indices 16-Day L3 Global 0.05 Deg CMG"
PROCESSINGCENTER			STRING		1		MCF		"MODAPS"
SEAPROCESSED				STRING		1		PGE		Variable
DESCRrevision				STRING		1		PGE		Variable
CHARACTERISTICBINANGULARSIZE    	DOUBLE 		1		PGE		Variable
CHARACTERISTICBINSIZE           	DOUBLE		1   		PGE		Variable
DATACOLUMNS                     	INTEGER		1   		PGE		Variable
DATAROWS                        	INTEGER		1   		PGE		Variable
GLOBALGRIDCOLUMNS               	INTEGER 	1   		PGE		Variable
GLOBALGRIDROWS                  	INTEGER 	1   		PGE		Variable
NUMBEROFDAYS				INTEGER		1		PGE		Variable
DAYSPROCESSED				STRING		16		PGE		Variable
GEOANYABNORMAL				STRING		1		PGE		Variable
GEOESTMAXRMSERROR			DOUBLE		1		PGE		Variable
QAPERCENTPOORQCMG16DAYNDVI		INTEGER		16		PGE		Variable
QAPERCENTPOORQCMG16DAYEVI		INTEGER		16		PGE		Variable
NDVICMG16DAYQCLASSPERCENTAGE		INTEGER		1		PGE		Variable
EVICMG16DAYQCLASSPERCENTAGE		INTEGER		1		PGE		Variable
PROCESSINGENVIRONMENT			STRING		1		PGE		Variable
PERCENTLAND				INTEGER		1		PGE		Variable
SNOWICEPROCESSED			STRING		1		PGE		Variable

Name:					Data Type:	# values:	Source:		Value:
------------------------------------------------------------------------------------------------
StructuralMetadata.0			PVL-STRING	1		SDPTK		Variable
StructMetadata.0: GROUP=SwathStructure
END_GROUP=SwathStructure
GROUP=GridStructure
	GROUP=GRID_1
		GridName="MODIS_Grid_16Day_VI_CMG"
		XDim=7200
		YDim=3600
		UpperLeftPointMtrs=(-180000000.000000 90000000.000000 
		LowerRightMtrs=(180000000.000000 -90000000.000000 
		GridOrigin=HDFE_GD_UL
		Projection=GCTP_GEO
		GROUP=Dimension
		END_GROUP=Dimension
		GROUP=DataField
			OBJECT=DataField_1
				DataFieldName="CMG 0.05 Deg 16 days NDVI"
				DataType=DFNT_INT16
				DimList=("YDim","XDim")
			END_OBJECT=DataField_1
			OBJECT=DataField_2
				DataFieldName="CMG 0.05 Deg 16 days EVI"
				DataType=DFNT_INT16
				DimList=("YDim","XDim")
			END_OBJECT=DataField_2
			OBJECT=DataField_3
				DataFieldName="CMG 0.05 Deg 16 days VI Quality"
				DataType=DFNT_UINT16
				DimList=("YDim","XDim")
			END_OBJECT=DataField_3
			OBJECT=DataField_4
				DataFieldName="CMG 0.05 Deg 16 days red reflectance"
				DataType=DFNT_INT16
				DimList=("YDim","XDim")
			END_OBJECT=DataField_4
			OBJECT=DataField_5
				DataFieldName="CMG 0.05 Deg 16 days NIR reflectance"
				DataType=DFNT_INT16
				DimList=("YDim","XDim")
			END_OBJECT=DataField_5
			OBJECT=DataField_6
				DataFieldName="CMG 0.05 Deg 16 days blue reflectance"
				DataType=DFNT_INT16
				DimList=("YDim","XDim")
			END_OBJECT=DataField_6
			OBJECT=DataField_7
				DataFieldName="CMG 0.05 Deg 16 days MIR reflectance"
				DataType=DFNT_INT16
				DimList=("YDim","XDim")
			END_OBJECT=DataField_7
			OBJECT=DataField_8
				DataFieldName="CMG 0.05 Deg 16 days Avg sun zen angle"
				DataType=DFNT_INT16
				DimList=("YDim","XDim")
			END_OBJECT=DataField_8
			OBJECT=DataField_9
				DataFieldName="CMG 0.05 Deg 16 days NDVI std dev"
				DataType=DFNT_INT16
				DimList=("YDim","XDim")
			END_OBJECT=DataField_9
			OBJECT=DataField_10
				DataFieldName="CMG 0.05 Deg 16 days EVI std dev"
				DataType=DFNT_INT16
				DimList=("YDim","XDim")
			END_OBJECT=DataField_10
			OBJECT=DataField_11
				DataFieldName="CMG 0.05 Deg 16 days #1km pix used"
				DataType=DFNT_UINT8
				DimList=("YDim","XDim")
			END_OBJECT=DataField_11
			OBJECT=DataField_12
				DataFieldName="CMG 0.05 Deg 16 days #1km pix +-30deg VZ"
				DataType=DFNT_UINT8
				DimList=("YDim","XDim")
			END_OBJECT=DataField_12
			OBJECT=DataField_13
				DataFieldName="CMG 0.05 Deg 16 days pixel reliability"
				DataType=DFNT_INT8
				DimList=("YDim","XDim")
			END_OBJECT=DataField_13
		END_GROUP=DataField
		GROUP=MergedFields
		END_GROUP=MergedFields
	END_GROUP=GRID_1
END_GROUP=GridStructure
GROUP=PointStructure
END_GROUP=PointStructure
END

Global HDF Attributes
Name:					Data Type:	# values:	Source:		Value:
------------------------------------------------------------------------------------------------
HDFEOSVersion           		STRING		1		SDPTK		Variable

End Global Metadata
================================================================================================

SDS Definitions:

Note:
	All data stored within DataFields that contain the HDF attributes "scale_factor" and 
	"add_offset" are scaled according to the following  data conversion:
	  file data = (parameter * scale_factor) + add_offset
	  parameter = (file data - add_offset) / scale_factor

------------------------------------------------------------------------------------------------

SDS Definition: DataField_1

Name:			CMG 0.05 Deg 16 days NDVI
Description:		Spatially complete data with cloud filtered and gap filled NDVI values
Data Type:		INT16
Rank:	     		2
Dimension sizes: 	(3600, 7200)
Dimension Names:
Dimension0:    		"YDim"
Dimension1:    		"XDim"

DataField_1 HDF Attributes:

Attribute:		Data Type:	Number of Values:     Source:	Value:
long_name		STRING		  string length		PGE	"CMG 0.05 Deg 16 days NDVI"
units			STRING		  string length		PGE	"NDVI"
valid_range		INT16			2		PGE	-2000, 10000
_FillValue		INT16			1		PGE	-3000
scale_factor		FLOAT64			1		PGE	10000.0
scale_factor_err	FLOAT64			1		PGE	0.0
add_offset		FLOAT64			1		PGE	0.0
add_offset_err		FLOAT64			1		PGE	0.0
calibrated_nt		INT32			1		PGE	5

------------------------------------------------------------------------------------------------

SDS Definition: DataField_2

Name:			CMG 0.05 Deg 16 days EVI
Description:		Spatially complete data with cloud filtered and gap filled EVI values
Data Type:		INT16
Rank:			2
Dimension Names:
Dimension0:		"YDim"
Dimension1:		"XDim"

DataField_2 HDF Attributes:

Attribute:		Data Type:	Number of Values:     Source:	Value:
long_name		STRING		  string length		PGE	"CMG 0.05 Deg 16 days EVI"
units			STRING		  string length		PGE	"EVI"
valid_range		INT16			2		PGE	-2000, 10000
_FillValue		INT16			1		PGE	-3000
scale_factor		FLOAT64			1		PGE	10000.0
scale_factor_err	FLOAT64			1		PGE	0.0
add_offset		FLOAT64			1		PGE	0.0
add_offset_err		FLOAT64			1		PGE	0.0
calibrated_nt		INT32			1		PGE	5

------------------------------------------------------------------------------------------------

SDS Definition: DataField_3

Name:			CMG 0.05 Deg 16 days VI Quality		
Description:		Quality Assurance data for both VI layers defined above. The 16 bit
                        unsigned integer has been divided into 9 separate QA fields that are
			defined below:
			
	Bit:	Description:
	0-1	NDVI quality
			00 NDVI produced, good quality;
			01 NDVI produced, but check QA
			10 (pixel not produced due to cloud effects)
			    pixel produced but most likely cloudy
			11 pixel not produced due to other reasons than clouds
	2-5	VI usefulness
			Four bit range where 0 is highest quality, 14 quality too low to be useful, 
			15 not useful for any other reason (used for fills). The value is calculated
			from other QA fields according to the contribution table below.
			Parameter           Condition                   Contribution
			------------------------------------------------------------
			Aerosol Quantity    Aerosol level: High         3
					    Aerosol level: Climatology  2
					    Aerosol level: Average      1
			Adjacent Cloud      If detected                 2
			BRDF Correction     If not performed            1
			Mixed Clouds        If detected                 3
			Geospatial Quality  <=25% contribution          3
					    <=50% contribution          2
					    <=75% contribution          1
			View Zenith Pixels  <50% with +-30deg           2
					    <100% with +-30deg          1
	6-7	aerosol quantity:
			climatology (00), low (01),  average (10), high (11) 
	8	Adjacent cloud detected; yes (1) or no (0) 
	9	yes (1) no (0) atmosphere BRDF correction performed
	10	mixed clouds yes (1) no (0)mixed clouds
	11-12	land/water flag  00 ocean; 01 coast; 10 wetland; 11 land
	13-14	Geospatial quality (Percent contribution)
			00  :  25% or less of the finer resolution data contribued to this CMG pixel
			01  :  50% or less of the finer resolution data contribued to this CMG pixel
			10  :  75% or less of the finer resolution data contribued to this CMG pixel
			11  : 100% or less of the finer resolution data contribued to this CMG pixel
	15	composite method for NDVI 
			0 BRDF model based nadir equivalent VI (Currently not used)
			1 CVMVC (constraint view angle maximum value VI)
  
Data Type:		UINT16
Rank:			2
Dimension Names:
Dimension0:		"YDim"
Dimension1:		"XDim"

DataField_3 HDF Attributes:

Attribute:		Data Type:	Number of Values:     Source:	Value:

long_name		STRING		  string length		PGE	"CMG 0.05 Deg 16 days VI Quality"
units			STRING		  string length		PGE	"bit field"
valid_range		INT16			2		PGE	0, 65534
_FillValue		INT16			1		PGE	65535
Legend			STRING		       1553		PGE	*Legend similar to above*

------------------------------------------------------------------------------------------------

SDS Definition: DataField_4

Name:			CMG 0.05 Deg 16 days red reflectance
Description:		QA filtered and spatially averaged red reflectance data
Data Type:		INT16
Rank:			2
Dimension Names:
Dimension0:		"YDim"
Dimension1:		"XDim"

DataField_4 HDF Attributes:

Attribute:		Data Type:	Number of Values:     Source:	Value:
long_name		STRING		  string length		PGE	"CMG 0.05 Deg 16 days red reflectance"
units			STRING		  string length		PGE	"reflectance"
valid_range		INT16			2		PGE	0, 10000
_FillValue		INT16			1		PGE	-1000
scale_factor		FLOAT64			1		PGE	10000.0
scale_factor_err	FLOAT64			1		PGE	0.0
add_offset		FLOAT64			1		PGE	0.0
add_offset_err		FLOAT64			1		PGE	0.0
calibrated_nt		INT32			1		PGE	5

------------------------------------------------------------------------------------------------

SDS Definition: DataField_5

Name:			CMG 0.05 Deg 16 days NIR reflectance
Description:		QA filtered and spatially averaged NIR reflectance data
Data Type:		INT16
Rank:			2
Dimension Names:
Dimension0:		"YDim"
Dimension1:		"XDim"

DataField_5 HDF Attributes:

Attribute:		Data Type:	Number of Values:     Source:	Value:
long_name		STRING		  string length		PGE	"CMG 0.05 Deg 16 days NIR reflectance"
units			STRING		  string length		PGE	"reflectance"
valid_range		INT16			2		PGE	0, 10000
_FillValue		INT16			1		PGE	-1000
scale_factor		FLOAT64			1		PGE	10000.0
scale_factor_err	FLOAT64			1		PGE	0.0
add_offset		FLOAT64			1		PGE	0.0
add_offset_err		FLOAT64			1		PGE	0.0
calibrated_nt		INT32			1		PGE	5

------------------------------------------------------------------------------------------------

SDS Definition: DataField_6

Name:			CMG 0.05 Deg 16 days blue reflectance
Description:		QA filtered and spatially averaged blue reflectance data
Data Type:		INT16
Rank:			2
Dimension Names:
Dimension0:		"YDim"
Dimension1:		"XDim"

DataField_6 HDF Attributes:

Attribute:		Data Type:	Number of Values:     Source:	Value:
long_name		STRING		  string length		PGE	"CMG 0.05 Deg 16 days blue reflectance"
units			STRING		  string length		PGE	"reflectance"
valid_range		INT16			2		PGE	0, 10000
_FillValue		INT16			1		PGE	-1000
scale_factor		FLOAT64			1		PGE	10000.0
scale_factor_err	FLOAT64			1		PGE	0.0
add_offset		FLOAT64			1		PGE	0.0
add_offset_err		FLOAT64			1		PGE	0.0
calibrated_nt		INT32			1		PGE	5

------------------------------------------------------------------------------------------------

SDS Definition: DataField_7

Name:			CMG 0.05 Deg 16 days MIR reflectance
Description:		QA filtered and spatially averaged MIR reflectance data
Data Type:		INT16
Rank:			2
Dimension Names:
Dimension0:		"YDim"
Dimension1:		"XDim"

DataField_7 HDF Attributes:

Attribute:		Data Type:	Number of Values:     Source:	Value:
long_name		STRING		  string length		PGE	"CMG 0.05 Deg 16 days MIR reflectance"
units			STRING		  string length		PGE	"reflectance"
valid_range		INT16			2		PGE	0, 10000
_FillValue		INT16			1		PGE	-1000
scale_factor		FLOAT64			1		PGE	10000.0
scale_factor_err	FLOAT64			1		PGE	0.0
add_offset		FLOAT64			1		PGE	0.0
add_offset_err		FLOAT64			1		PGE	0.0
calibrated_nt		INT32			1		PGE	5

------------------------------------------------------------------------------------------------

SDS Definition: DataField_8

Name:			CMG 0.05 Deg 16 days Avg sun zen angle
Description:		QA filtered and spatially averaged sun zenith angle data
Data Type:		INT16
Rank:			2
Dimension Names:
Dimension0:		"YDim"
Dimension1:		"XDim"

DataField_8 HDF Attributes:

Attribute:		Data Type:	Number of Values:     Source:	Value:
long_name		STRING		  string length		PGE	"CMG 0.05 Deg 16 days Avg sun zen angle"
units			STRING		  string length		PGE	"degrees"
valid_range		INT16			2		PGE	-9000, 9000
_FillValue		INT16			1		PGE	-10000
scale_factor		FLOAT64			1		PGE	100.0
scale_factor_err	FLOAT64			1		PGE	0.0
add_offset		FLOAT64			1		PGE	0.0
add_offset_err		FLOAT64			1		PGE	0.0
calibrated_nt		INT32			1		PGE	5

------------------------------------------------------------------------------------------------

SDS Definition: DataField_9

Name:			CMG 0.05 Deg 16 days NDVI std dev
Description:		Standard deviation computed from input NDVI pixels that passed QA filtering
Data Type:		INT16
Rank:			2
Dimension Names:
Dimension0:		"YDim"
Dimension1:		"XDim"

DataField_9 HDF Attributes:

Attribute:		Data Type:	Number of Values:     Source:	Value:
long_name		STRING		  string length		PGE	"CMG 0.05 Deg 16 days NDVI std dev"
units			STRING		  string length		PGE	"NDVI"
valid_range		INT16			2		PGE	0, 10000
_FillValue		INT16			1		PGE	-3000
scale_factor		FLOAT64			1		PGE	10000.0
scale_factor_err	FLOAT64			1		PGE	0.0
add_offset		FLOAT64			1		PGE	0.0
add_offset_err		FLOAT64			1		PGE	0.0
calibrated_nt		INT32			1		PGE	5

------------------------------------------------------------------------------------------------

SDS Definition: DataField_10

Name:			CMG 0.05 Deg 16 days EVI std dev
Description:		Standard deviation computed from input EVI pixels that passed QA filtering
Data Type:		INT16
Rank:			2
Dimension Names:
Dimension0:		"YDim"
Dimension1:		"XDim"

DataField_10 HDF Attributes:

Attribute:		Data Type:	Number of Values:     Source:	Value:
long_name		STRING		  string length		PGE	"CMG 0.05 Deg 16 days EVI std dev"
units			STRING		  string length		PGE	"EVI"
valid_range		INT16			2		PGE	0, 10000
_FillValue		INT16			1		PGE	-3000
scale_factor		FLOAT64			1		PGE	10000.0
scale_factor_err	FLOAT64			1		PGE	0.0
add_offset		FLOAT64			1		PGE	0.0
add_offset_err		FLOAT64			1		PGE	0.0
calibrated_nt		INT32			1		PGE	5

------------------------------------------------------------------------------------------------

SDS Definition: DataField_11

Name:			CMG 0.05 Deg 16 days #1km pix used
Description:		The number of 1km input pixels that passed the QA filter and were used for
			calculation of the resulting CMG pixel. Will be set to 0 if no pixels were
			used. This is also true for pixels in boreal darkness. The layer is complete
			and was constructed by referring to the ancillary input landwater mask.
Data Type:		UINT8
Rank:			2
Dimension Names:
Dimension0:		"YDim"
Dimension1:		"XDim"

DataField_11 HDF Attributes:

Attribute:		Data Type:	Number of Values:     Source:	Value:
long_name		STRING		  string length		PGE	"CMG 0.05 Deg 16 days #1km pix used"
units			STRING		  string length		PGE	"Pixels"
valid_range		INT16			2		PGE	0, 36
_FillValue		INT16			1		PGE	255
scale_factor		FLOAT64			1		PGE	1.0
scale_factor_err	FLOAT64			1		PGE	0.0
add_offset		FLOAT64			1		PGE	0.0
add_offset_err		FLOAT64			1		PGE	0.0
calibrated_nt		INT32			1		PGE	5

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SDS Definition: DataField_12

Name:			CMG 0.05 Deg 16 days #1km pix +-30deg VZ
Description:		The number of 1km input pixels that passed the QA filter and had a view 
			zenith angle less than +/-30 degrees in the input data. This number will 
			always be less than or equal to the number defined in SDS #11 above.
Data Type:		UINT8
Rank:			2
Dimension Names:
Dimension0:		"YDim"
Dimension1:		"XDim"

DataField_12 HDF Attributes:

Attribute:		Data Type:	Number of Values:     Source:	Value:
long_name		STRING		  string length		PGE	"CMG 0.05 Deg 16 days #1km pix +-30deg VZ"
units			STRING		  string length		PGE	"Pixels"
valid_range		INT16			2		PGE	0, 36
_FillValue		INT16			1		PGE	255
scale_factor		FLOAT64			1		PGE	1.0
scale_factor_err	FLOAT64			1		PGE	0.0
add_offset		FLOAT64			1		PGE	0.0
add_offset_err		FLOAT64			1		PGE	0.0
calibrated_nt		INT32			1		PGE	5

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SDS Definition: DataField_13

Name:			CMG 0.05 Deg 16 days pixel reliability
Description:		The CMG pixel realiability is a ranking scheme that summarizes all QA 
			info indicating how reliable the pixel is:
			-1 : No data, FILL value
			 0 : Ideal data, use with confidence
			 1 : Good data, but with one or more problems of aerosol, shadow, viewing
			     geomtery, etc..
			 2 : Possible snow/ice cover (only set if requested in the PCF).
			     The algorithm uses a threshold technique based on the input QA snow/
			     ice flag. If 10% or more of contributing input pixels to a CMG pixel 
			     have the snow/ice flag set, it will be marked as snow/ice. In case 
			     the PCF flag is set to NO, no information regarding snow/ice cover
			     will be present in the output. There is a metadata attribute in the 
			     output file, "SNOWICEFLAGGED", that indicates whether or not snow/ice 
			     was flagged at processing time.
			 3 : Cloud covered data 
			     Theoretically there should be no cloudy data in this product. The 
			     algorithm  completely filters all cloudy data and fill the gaps using
		             historic MODIS time series data set. However, when no historic data is
			     available (<0.002% of all pixels, collection 4 icorrectly marked data),
			     the VI layers will display a fill calculated from cloudy values and 
			     this will be indicated in the pixel reliability.
			 4 : No real data, estimaetd from historic time series(*)
		(*) The historic time series used to fill the gaps is a compilation of a consistent 
		    year average from all the MODIS data to this date. This historic data set is 
		    only used when actual data is missing or cloudy for the composite periods being 
		    processed.
		    
Data Type:		INT8
Rank:			2
Dimension Names:
Dimension0:		"YDim"
Dimension1:		"XDim"

DataField_13 HDF Attributes:

Attribute:		Data Type:	Number of Values:     Source:	Value:
long_name		STRING		  string length		PGE	"CMG 0.05 Deg 16 days pixel reliability"
units			STRING		  string length		PGE	"rank"
valid_range		INT16			2		PGE	0, 4
_FillValue		INT16			1		PGE	-1
scale_factor		FLOAT64			1		PGE	1.0
scale_factor_err	FLOAT64			1		PGE	0.0
add_offset		FLOAT64			1		PGE	0.0
add_offset_err		FLOAT64			1		PGE	0.0
calibrated_nt		INT32			1		PGE	5

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Last updated: October 10, 2019