MOD10A2 Product File Specification
Version: V 6.0.0
Revision: 0
Date: 21 December 2015
Product ID: MOD10
ESDT: MOD10A2
Name: Eight Day Snow Cover - Tile
Level: 3
Process ID: MOD_PR10A2
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
301-614-5634
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:
This specification description of the MOD10A2 eight day
snow product describes the Collection 5 data product.
The eight day snow cover product can be created with two to eight
days of input files. Eight day periods are defined by the MODLAND
scheme. There are 46 eight day periods in a year. The periods are
1-8, 9-16, 17-24,...361-368. The last period of a year extends into
the next year. The product is generated for a tile of the
sinusoidal map projection using the daily snow products (MOD10A1) as
input. Since the eight days of data may not always be available,
the algorithm is designed to run with a minimum of two days of input
and with a maximum of eight days of input. The days of input may or
may not be consecutive.
The product consists of eight global attributes and two SDSs with
local attributes. A general description of the global metadata is
given. Descriptions of the SDS structures are given along with a
listing of the local attributes, dimensions, and content of SDSs.
Contents:
SDS names:
Maximum_Snow_Extent
Eight_Day_Snow_Cover
Global Metadata:
CoreMetadata.0
ArchiveMetadata.0
StructMetadata.0
HDFEOSVersion
SCF Algorithm Version
Number of input days
Days input
Eight day period
Global Attributes ===================================================
Name: Type: Num_Val:Source: Value:
CoreMetadata.0 PVL-STRING
1 TK Variable
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 "further update
is anticipated"
ScienceQualityFlag STRING 1 DP Variable
AutomaticQualityFlagExplanation
STRING 1 PGE "No automatic quality assessment done in the PGE"
AutomaticQualityFlag STRING 1 PGE "Passed"
OperationalQualityFlagExplanation
STRING 1 PGE Variable
OperationalQualityFlag STRING 1 PGE Variable
ScienceQualityFlagExplanation
STRING 1 DP Variable
QAPercentMissingData INTEGER 1 PGE 0 - 100
QAPercentCloudCover INTEGER 1 PGE 0 - 100
ParameterName STRING 1 PGE "Maximum Snow Extent"
VersionID INTEGER 1 MCF Variable
ShortName STRING 1 MCF "MOD10A2"
InputPointer STRING 16 PGE Variable
GRingPointLongitude DOUBLE 4 PGE Variable
GRingPointLatitude DOUBLE 4 PGE Variable
GRingPointSequenceNo INTEGER 4 PGE Variable
ExclusionGRingFlag STRING 1 PGE "N"
RangeEndingDate DATE 1 PGE Variable
RangeEndingTime TIME 1 PGE Variable
RangeBeginningDate DATE 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 Attibutues (PSA)**
AdditionalAttributeName.1 STRING 1 PGE QAPERCENTGOODQUALITY
ParameterValue.1 INTEGER 1 PGE 0 - 100
AdditionalAttributeName.2 STRING 1 PGE QAPERCENTOTHERQUALITY
ParameterValue.2 INTEGER 1 PGE 0 - 100
AdditionalAttributeName.3 STRING 1 PGE HORIZONTALTILENUMBER
ParameterValue.3 INTEGER 1 PGE 0-35
AdditionalAttributeName.4 STRING 1 PGE VERTICALTILENUMBER
ParameterValue.4 INTEGER 1 PGE 0-17
AdditionalAttributeName.5 STRING 1 PGE TileID
ParameterValue.5 INTEGER 1 PGE Variable
AdditionalAttributeName.6 STRING 1 PGE SNOWCOVERPERCENT
ParameterValue.6 INTEGER 1 PGE 0 - 100
End CoreMetadata.0 _________________________________
Name: Type: Num_Val:Source: Value:
ArchiveMetadata.0 PVL-STRING 1 TK
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
AlgorithmPackageAcceptanceDate STRING 1 PGE "01 2005"
AlgorithmPackageMaturityCode STRING 1 PGE "OPL"
AlgorithmPackageName STRING 1 PGE "MOD10A2 Eight-day maximum snow extent"
AlgorithmPackageVersion STRING 1 PGE "SCF 6.0.0"
LongName STRING 1 MCF "MODIS/Terra Snow Cover
8-Day L3 Global 500m SIN
Grid"
InstrumentName STRING 1 MCF "Moderate
Resolution Imaging
Spectroradiometer"
PlatformShortName STRING 1 MCF "Terra"
LocalInputGranuleID STRING 16 PGE Variable
ProcessingCenter STRING 1 MCF "MODAPS"
ProcessingDateTime DATETIME1 PGE Variable
SPSOParameters STRING 1 PGE "none"
NorthBoundingCoordinate DOUBLE 1 PGE Variable
SouthBoundingCoordinate DOUBLE 1 PGE Variable
EastBoundingCoordinate DOUBLE 1 PGE Variable
WestBoundingCoordinate DOUBLE 1 PGE Variable
ProcessingEnvironment STRING 1 PGE Variable
DESCRrevision STRING 1 MCF Variable
End ArchiveMetadata.0 _________________________________
StructMetadata.0 DFNT_CHAR 1 TK Variable
GROUP=SwathStructure
END_GROUP=SwathStructure
GROUP=GridStructure
GROUP=GRID_1
GridName="MOD_Grid_Snow_500m"
XDim=2400
YDim=2400
UpperLeftPointMtrs=(calculated, calculated)
LowerRightMtrs=(calculated, calculated)
Projection=GCTP_SNSOID
ProjParams=(6371007.181000,0,0,0,0,0,0,0,0,0,0,0,0)
SphereCode=-1
GridOrigin=HDFE_GD_UL
GROUP=Dimension
END_GROUP=Dimension
GROUP=DataField
OBJECT=DataField_1
DataFieldName="Maximum_Snow_Extent"
DataType=DFNT_UINT8
DimList=("YDim","XDim")
CompressionType=HDFE_COMP_DEFLATE
DeflateLevel=9
END_OBJECT=DataField_1
OBJECT=DataField_2
DataFieldName="Eight_Day_Snow_Cover"
DataType=DFNT_UINT8
DimList=("YDim","XDim")
CompressionType=HDFE_COMP_DEFLATE
DeflateLevel=9
END_OBJECT=DataField_2
END_GROUP=DataField
GROUP=MergedFields
END_GROUP=MergedFields
END_GROUP=GRID_1
END_GROUP=GridStructure
GROUP=PointStructure
END_GROUP=PointStructure
END
End StructMetadta.0 -----------------------------------
SCF Algorithm Version DFNT_CHAR 1 PGE Variable
HDFEOSVersion DFNT_CHAR 1 PGE Variable
Number of input days DFNT_CHAR 1 PGE Variable
Days input DFNT_CHAR 1 PGE Variable
Eight day period DFNT_CHAR 1 PGE Variable
============================================================================
SDS Definition
SDS Name: Maximum_Snow_Extent
Description: If a cell was identified as snow-covered on any of the
eight days of the period it is identified as snow-covered
for the period.
Data conversions: None.
Number Type: HDF-UINT8
Rank: 2
Dimension Sizes: "Data Rows", "Data Columns"
Dimension Names:
Dimension0: Data Rows
Dimension1: Data Columns
SDS Local Attributes:
Name: Type: Num_Val: Source: Value:
HDF Predefined Attributes
by Reserved Label name____
long_name DFNT_CHAR string length PGE "Maximum snow extent over the 8-day period"
units DFNT_CHAR string length PGE "none"
coordsys DFNT_CHAR string length PGE "cartesian"
valid_range DFNT_UINT8 2 PGE 0,254
_FillValue DFNT_UINT8 1 PGE 255
Custom Attributes____
Cell_area (km^2) DFNT_FLOAT32 1 PGE Variable
Max_snow_area (km^2) DFNT_FLOAT32 1 PGE Variable
Key DFNT_CHAR string length PGE "0=missing data, 1=no decision, 11=night, 25=no snow, 37=lake, 39=ocean, 50=cloud, 100=lake ice, 200=snow, 254=detector saturated, 255=fill"
============================================================================
SDS Definition
SDS Name: Eight_Day_Snow_Cover
Description: Occurrence of snow in a grid cell on each of the eight days
of the period is given in this SDS as a bit flag. Days are
sequential across the byte; i.e. bit 0 == day 1,
bit 1 == day 2, etc. The bit is on if snow was identified.
The bit is off if otherwise.
Data conversions: None.
Number Type: DFNT_UINT8
Rank: 2
Dimension Sizes: "Data Rows", "Data Columns"
Dimension Names:
Dimension0: Data Rows
Dimension1: Data Columns
SDS Local Attributes:
Name: Type: Num_Val: Source: Value:
HDF Predefined Attributes
by Reserved Label name____
long_name DFNT_CHAR string length PGE "Eight day snow
cover chronobyte"
units DFNT_CHAR string length PGE "bit"
coordsys DFNT_CHAR string length PGE "cartesian"
valid_range DFNT_UINT8 2 PGE 0,255
_FillValue DFNT_UINT8 1 PGE 0
Custom Attributes____
Key DFNT_CHAR string length PGE "Snow occurrence in chronological order. Day in period ordered as 87654321 corresponds to bit order of 76543210. Bit value of 1 means snow was observed. Bit value of 0 means snow was not observed."
============================================================================