MYD10C1 Climate Modeling Grid (CMG) Product File Specification
Version: 6.0.0
Revision: 0
Date: 21 December 2015
Product ID: MYD10
Process: MOD_PR10C1
ESDT: MYD10C1
Product name: MODIS/Aqua Snow Cover Daily 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
Sudipta Sarkar
SSAI
NASA, GSFC, Code 619
Greenbelt, MD 20771
301-614-6912
Sudipta.Sarkar@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 MYD10C1 Climate Modeling
Grid (CMG) daily snow product at 0.05Deg resolution.
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:
Day_CMG_Snow_Cover
Day_CMG_Clear_Index
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 "processed once"
LocalVersionID STRING 1 PGE Variable
ReprocessingPlanned STRING 1 PGE "further update
anticipated"
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 Variable
QAPercentMissingData INTEGER 1 PGE 0-100
QAPercentCloudCover INTEGER 1 PGE 0-100
ParameterName STRING 1 PGE "Global Snow Cover"
VersionID INTEGER 1 MCF Variable
ShortName STRING 1 MCF "MYD10C1"
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 "Aqua"
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 TK Variable
AlgorithmPackageAcceptanceDate STRING 1 PGE Variable
AlgorithmPackageMaturityCode STRING 1 PGE Variable
AlgorithmPackageName STRING 1 PGE "MOD_PR10C1"
AlgorithmPackageVersion STRING 1 PGE Variable
LongName STRING 1 MCF "MODIS/Aqua Snow Cover Daily L3 Global 0.05Deg CMG"
InstrumentName STRING 1 MCF "Moderate
Resolution
Imaging
Spectroradiometer"
PlatformShortName STRING 1 MCF "Aqua"
GlobalGridColumns INTEGER 1 PGE 7200
GlobalGridRows INTEGER 1 PGE 3600
ProcessingCenter STRING 1 MCF "MODAPS"
ProcessingDateTime DATETIME1 PGE Variable
SPSOParameters STRING 1 PGE "none"
DESCRevision STRING 1 MCF Variable
ProcessingEnvironment 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="Day_CMG_Snow_Cover"
DataType=DFNT_UINT8
DimList=("YDim","XDim")
CompressionType=HDFE_COMP_DEFLATE
DeflateLevel=9
END_OBJECT=DataField_1
OBJECT=DataField_2
DataFieldName="Day_CMG_Clear_Index"
DataType=DFNT_UINT8
DimList=("YDim","XDim")
CompressionType=HDFE_COMP_DEFLATE
DeflateLevel=9
END_OBJECT=DataField_2
OBJECT=DataField_3
DataFieldName="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: Day_CMG_Snow_Cover
Description:
This SDS provides a daily 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 daily snow tiled
product (MYD10A1).
Number Type: DFNT_UINT8
Rank: 2
Dimension sizes:(3600, 7200)
SDS attributes:
Name: Type: Num_val: Source: Value:
long_name DFNT_CHAR 1 PGE "Daily snow extent, global at 5km"
units DFNT_CHAR 1 PGE "none"
coordsys DFNT_CHAR 1 PGE "latitude, longitude"
valid_range DFNT_UINT8 2 PGE 0, 100
_FillValue DFNT_UNIT8 1 PGE 255
Cell_resolution DFNT_CHAR 1 PGE 0.05 deg
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 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: 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:(3600, 7200)
SDS Metadata:
Name: Type: Num_val: Source: Value:
long_name DFNT_CHAR 1 PGE "Clear index for the daily snow map"
units DFNT_CHAR 1 PGE "none"
coordsys DFNT_CHAR 1 PGE "latitude, longitude"
valid_range DFNT_UINT8 2 PGE 0, 100
_FillValue DFNT_UNIT8 1 PGE 255
Cell_resolution DFNT_CHAR 1 PGE 0.05 deg
Water_mask_land_threshold (%)
DFNT_FLOAT32 1 PGE 12.00000
Antarctica_Clear_index_note DFNT_CHAR 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, 111=night, 237=inland water, 239=ocean, 250=cloud obscured water, 253=data not mapped, 255=fill
===============================================================================
SDS Definition
SDS Name: 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 in the CMG cell.
Number Type: DFNT_UINT8
Rank: 2
Dimension sizes:(3600, 7200)
SDS attributes:
Name: Type: Num_val: Source: Value:
long_name DFNT_CHAR 1 PGE "Daily cloud obscuration percentage"
units DFNT_CHAR 1 PGE "none"
coordsys DFNT_CHAR 1 PGE "latitude, longitude"
valid_range DFNT_UINT8 2 PGE 0, 100
_FillValue DFNT_UNIT8 1 PGE 255
Cell_resolution DFNT_CHAR 1 PGE 0.05 deg
Water_mask_land_threshold (%)
DFNT_FLOAT32 1 PGE 12.00000
Antarctica_cloud_note DFNT_CHAR 1 PGE "Antarctica deliberately mapped as snow. Cloud value 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, 252=Antarctica mask, 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:(3600, 7200)
SDS Metadata:
Name: Type: Num_val: Source: Value:
long_name DFNT_CHAR 1 PGE "Snow cover per cell QA"
units DFNT_CHAR 1 PGE "bit"
key DFNT_CHAR 1 PGE "0=best, 1=good, 2=ok, 3=poor, 4=other, 237=inland water, 239=ocean, 250=cloud obscured water 252=Antarctica mask, 253=not mapped, 254=no retrieval 255=fill"
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
Cell_resolution DFNT_CHAR 1 PGE 0.05 deg
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 252"
===============================================================================