MOD10C2 Climate Modeling Grid (CMG) Product File Specification

Version:       	6.0.0
Revision:      	0
Date:	       	21 December 2015
Product ID:	MOD10
Process:	MOD_PR10C2
ESDT:		MOD10C2
Product name:	MODIS/Terra Snow Cover 8-Day L3 Global 0.05Deg CMG
Product Level:	3


Point of Contact:       George Riggs
			SSAI
			NASA, GSFC, Code 971
			Greenbelt, MD 20771
			301-614-5650
			George.A.Riggs.1@gsfc.nasa.gov
			

Principal Investigator: Vincent V. Salomonson
			NASA, GSFC, Code 900
			Greenbelt, MD 20771
			301-614-5631
			Vincent.V.Salomonson@nasa.gov

Associate Investigator: Dorothy K. Hall
                        NASA, GSFC, Code 971
                        Greenbelt, MD 20771
                        301-614-5771
                        Dorothy.K.Hall@nasa.gov

Description:  	

Specification description of the MOD10C2 Climate Modeling
Grid (CMG) eight-day snow product at 0.05Deg resolution.  
A general description of the ECS global metadata is given.  

Descriptions of the SDSs are given along with a listing of the ECS global
attributes (metadata), global attributes, local attributes, dimensions, 
and content of the SDSs.

The level 3 CMG snow cover product is archived in HDF-EOS 
format and consists of 4 global attributes and 4 SDSs 
with local attributes.  The CMG is in the HDF-EOS geographic projection
with a cell resolution of 0.05 degrees (approximately 5.55 km).  


Contents:

SDS names:
	Eight_Day_CMG_Snow_Cover
	Eight_Day_CMG_Clear_Index
	Eight_Day_CMG_Cloud_Obscured
	Snow_Spatial_QA

Global Metadata:
	CoreMetadata.0
	ArchiveMetadata.0
	StructMetadata.0
	HDFEOSVersion

Name:				Type:	Num_Val:Source:		Value:
CoreMetadata.0			PVL-STRING      TK		

LocalGranuleID			STRING	1       PGE             Variable
SizeMBECSDataGranule		DOUBLE	1	DSS		Variable
ProductionDateTime		DATETIME1       TK              Variable
DayNightFlag			STRING	1	PGE		Variable
ReprocessingActual		STRING	1       PGE             Variable
LocalVersionID			STRING	1       PGE             "SCF V6.0.0"
ReprocessingPlanned		STRING	1       PGE             Variable
ScienceQualityFlag		STRING	1	DP		"Not Investigated"
AutomaticQualityFlagExplanation	STRING	1       PGE             "No automatic quality assessment done in the PGE."
AutomaticQualityFlag		STRING	1       PGE             "Passed"
OperationalQualityFlagExplanation
				STRING	1	DAAC		Variable
OperationalQualityFlag		STRING	1	DAAC		Variable
ScienceQualityFlagExplanation	STRING	1	DP		"See http://landdb1.nascom.nasa.gov/QA_WWW/release.cgi for the Science QA status of this product."
QAPercentMissingData		INTEGER	1       PGE             0-100
QAPercentCloudCover		INTEGER	1       PGE             0-100
ParameterName			STRING	1       PGE             "Eight Day Global Snow Cover
VersionID			INTEGER	1       MCF             Variable
ShortName			STRING	1       MCF             "MOD10C2"
InputPointer			STRING	461     PGE             Variable
EastBoundingCoordinate		DOUBLE	1       PGE             (180.000000)
WestBoundingCoordinate		DOUBLE	1       PGE             (-180.000000)
SouthBoundingCoordinate		DOUBLE	1       PGE             (-90.00000)
NorthBoundingCoordinate		DOUBLE	1       PGE             (90.000000)
ZoneIdentifier			STRING	1	PGE		"Other Grid System"
" 
RangeEndingDate			DATE	1       PGE             Variable
RangeEndingTime			TIME	1       PGE             Variable
RangeBeginningDate		DATE	1       PGE             Variable
RangeBeginningTime		TIME	1       PGE             Variable
PGEVersion			STRING	1       PGE             Variable
AssociatedSensorShortName	STRING	1	MCF		"MODIS"
AssociatedPlatformShortName	STRING	1	MCF		"Terra"
AssociatedInstrumentShortname	STRING	1	MCF		"MODIS"

** Product Specific Attributes (PSAs) **
AdditionalAttributeName.1	STRING	1       PGE             QAPERCENTGOODQUALITY
ParameterValue.1		STRING	1       PGE             0-100
AdditionalAttributeName.2	STRING	1       PGE             QAPERCENTOTHERQUALITY
ParameterValue.2		STRING	1       PGE             0-100
AdditionalAttributeName.3	STRING	1       PGE             SNOWCOVERPERCENT
ParameterValue.3	 	STRING	1       PGE             0-100
End CoreMetadata.0 _________________________________

Name:                   	Type:      Num_Val:     Source:         Value:
ArchiveMetadata.0       	PVL-STRING	1	TK              Variable

AlgorithmPackageAcceptanceDate  STRING          1       PGE             Variable
AlgorithmPackageMaturityCode    STRING          1       PGE             "OPL"
AlgorithmPackageName            STRING          1       PGE             "MOD_PR10C2"
AlgorithmPackageVersion         STRING          1       PGE             "V6.0.0"
LongName                        STRING          1       MCF             "MODIS/Terra Snow Cover 8-Day L3 Global 0.05Deg CMG"

InstrumentName                  STRING          1       MCF             "Moderate 
									Resolution 
									Imaging 
									Spectroradiometer"
PlatformShortName               STRING          1       MCF            "Terra"
GlobalGridColumns		INTEGER		1	PGE		 7200
GlobalGridRows			INTEGER		1	PGE		 3600
ProcessingCenter                STRING          1       MCF             "MODAPS"
ProcessingDateTime              DATETIME        1       PGE             Variable
SPSOParameters                  STRING          1       PGE             "none"
DESCRevision			STRING		1	MCF		 Variable
ProcesssingEnvironment		STRING		1	PGE		Variable

End ArchiveMetadata.0 _________________________________

StructMetadata.0                DFNT_CHAR8           32000         
GROUP=SwathStructure
END_GROUP=SwathStructure
GROUP=GridStructure
	GROUP=GRID_1
		GridName="MOD_CMG_Snow_5km"
		XDim=7200
		YDim=3600
		UpperLeftPointMtrs=(-180000000.000000,90000000.000000)
		LowerRightMtrs=(180000000.000000,-90000000.000000)
		Projection=GCTP_GEO
		GridOrigin=HDFE_GD_UL
		GROUP=Dimension
		END_GROUP=Dimension
		GROUP=DataField
			OBJECT=DataField_1
				DataFieldName="Eight_Day_CMG_Snow_Cover"
				DataType=DFNT_UINT8
				DimList=("YDim","XDim")
				CompressionType=HDFE_COMP_DEFLATE
				DeflateLevel=9
			END_OBJECT=DataField_1
			OBJECT=DataField_2
				DataFieldName="Eight_Day_CMG_Clear_Index"
				DataType=DFNT_UINT8
				DimList=("YDim","XDim")
				CompressionType=HDFE_COMP_DEFLATE
				DeflateLevel=9
			END_OBJECT=DataField_2
			OBJECT=DataField_3
				DataFieldName="Eight_Day_CMG_Cloud_Obscured"
				DataType=DFNT_UINT8
				DimList=("YDim","XDim")
				CompressionType=HDFE_COMP_DEFLATE
				DeflateLevel=9
			END_OBJECT=DataField_3
			OBJECT=DataField_4
				DataFieldName="Snow_Spatial_QA"
				DataType=DFNT_UINT8
				DimList=("YDim","XDim")
				CompressionType=HDFE_COMP_DEFLATE
				DeflateLevel=9
			END_OBJECT=DataField_4
		END_GROUP=DataField
		GROUP=MergedFields
		END_GROUP=MergedFields
	END_GROUP=GRID_1
END_GROUP=GridStructure
GROUP=PointStructure
END_GROUP=PointStructure
END

Other Global Attributes:
Name:                   Type:		Num_Val:Source: Value:
HDFEOSVersion           DFNT_CHAR	1	PGE	Variable

End Other Global Attributes --------------------------
===============================================================================

SDS Definition
SDS Name:      Eight_Day_CMG_Snow_Cover
Description:	
This SDS provides an eight day global view of snow cover extent at 0.05 x 0.05 
degree resolution.  Data given is the percentage of snow-covered land based on
the total amount of land that could be in the CMG cell. This value is based 
on the counts of pixels binned into the CMG cell from the 8-day snow 
product (MOD10A2).  

Number Type:    DFNT_UINT8
Rank:		2
Dimension sizes:(Xdim, Ydim)
SDS attributes:
Name:		  	Type:	     Num_val:  	Source:	Value:
long_name	  	DFNT_CHAR  	1	PGE	"Eight day snow cover extent, 5km"
units		  	DFNT_CHAR  	1	PGE	"none"
format			DFNT_CHAR  	1	PGE	"I3"
coordsys		DFNT_CHAR  	1	PGE	"latitude, longitude"
valid_range	  	DFNT_UINT8 	2	PGE	0, 100
_FillValue	  	DFNT_UNIT8  	1	PGE	255	
Mask_Value	  	DFNT_UNIT8  	1	PGE	254	
Night_Value             DFNT_UINT8      1	PGE     111
Water_mask_land_threshold (%)   
			DFNT_FLOAT32    1       PGE	12.00000
Antarctica_snow_note    DFNT_CHAR       1 	PGE	"Antarctica deliberately mapped as snow"
Key                     DFNT_CHAR8      1       PGE     "0-100=percent of snow in a cell, 107=lake ice, 111=night, 237=inland water, 239=ocean, 250=cloud obscured water, 253=data not mapped, 255=fill" 
===============================================================================

SDS Definition
SDS Name:       Eight_Day_CMG_Clear_Index
Description:	
Data is the percentage of land observed (clear sky view of the surface) in a 
CMG cell based on the total amount of land that could be in the CMG cell. An 
ancillary data file of the amount of land in a CMG cell, as determined from the 
land/water mask, was created and used for the base of this percentage.  If all 
the land area in a cell was observable the data value would be 100.  The 
percentage of snow in a cell is related to this value in that this value 
indicates how much confidence may be associated with the amount of snow 
reported for the cell. 

Number Type:    DFNT_UINT8
Rank:		2
Dimension sizes:(Xdim, Ydim)
SDS Metadata:
Name:		  	Type:	     Num_val:  	Source:	Value:
long_name	  	DFNT_CHAR  	1	PGE	"Clear index for the eight day snow map"
units		  	DFNT_CHAR  	1	PGE	"none"
format			DFNT_CHAR  	1	PGE	"I3"
coordsys		DFNT_CHAR  	1	PGE	"latitude, longitude"
valid_range	  	DFNT_UINT8 	2	PGE	0, 100
_FillValue	  	DFNT_UNIT8  	1	PGE	255	
Mask_Value	  	DFNT_UNIT8  	1	PGE	254	
Water_mask_land_threshold (%)
			DFNT_FLOAT32    1       PGE	12.00000
Antarctica_Clear_index_note
			DFNT_CHAR8      1	PGE	"Antarctica deliberately mapped as snow. Clear index set to 100."
Key                     DFNT_CHAR8      1	PGE	"0-100=clear index value, 107=lake ice, 237=inland water, 239=ocean, 250=cloud obscured water, 253=data not mapped, 255=fill"
===============================================================================

SDS Definition
SDS Name:       Eight_Day_CMG_Cloud_Obscured
Description:	
This SDS provides a daily global view of the amount of cloud obscuration 
observed in a cell for the period.  Data 
given is the percentage of cloud-covered land based on the amount of 
land that could be in the CMG cell.  

Number Type:    DFNT_UINT8
Rank:		2
Dimension sizes:(Xdim, Ydim)
SDS attributes:
Name:		  	Type:	     Num_val:  	Source:	Value:
long_name	  	DFNT_CHAR  	1	PGE	"Cloud obscuration percentage for the eight day snow map"
units		  	DFNT_CHAR  	1	PGE	"none"
format			DFNT_CHAR  	1	PGE	"I3"
coordsys		DFNT_CHAR  	1	PGE	"latitude, longitude"
valid_range	  	DFNT_UINT8 	2	PGE	0, 100
_FillValue	  	DFNT_UNIT8  	1	PGE	255	
Mask_value	  	DFNT_UNIT8  	1	PGE	254	
Not_processed_value     DFNT_UINT8      1     	PGE	252
Night_value             DFNT_UINT8      1	PGE     111
Water_mask_land_threshold (%
			DFNT_FLOAT32    1       PGE	12.00000
Antarctica_cloud_note   DFNT_CHAR       1	PGE	"Antarctica deliberately mapped as snow. Cloud set to 252."
Key                     DFNT_CHAR8      1	PGE	"0-100=percent of cloud in cell, 107=lake ice, 111=night, 237=inland water, 239=ocean, 250=cloud obscured water,  253=data not mapped, 255=fill"
===============================================================================

SDS Definition
SDS Name:       Snow_Spatial_QA
Description:	
Data given indicates the quality of the result in each cell of the CMG.  
QA values describe input data binned into each 0.05 degree cell:

Number Type:    DFNT_UINT8
Rank:		2
Dimension sizes:(Xdim, Ydim)
SDS Metadata:
Name:		  	Type:	     Num_val:  	Source:	Value:
long_name	  	DFNT_CHAR  	1	PGE	"Snow cover per cell QA" 
units		  	DFNT_CHAR  	1	PGE	"none"
format			DFNT_CHAR  	1	PGE	"I3"
coordsys		DFNT_CHAR  	1	PGE	"latitude, longitude"
valid_range	  	DFNT_UINT8 	2	PGE	0, 3
_FillValue	  	DFNT_UNIT8  	1	PGE	255	
Mask_value		DFNT_UINT8	1	PGE	254
Water_mask_land_threshold (%)   
			DFNT_FLOAT32    1       PGE	12.00000
Antarctica_QA_note      DFNT_CHAR       1	PGE	"Antarctica deliberately mapped as snow. QA value set to 1."
key                     DFNT_CHAR       1	PGE	"0=good quality, 1=other quality, 237=inland water, 239=ocean, 252=Antarctica mask, 253=data not mapped, 255=fill"
===============================================================================