MYD10_L2 Product File Specification
Version: V5.0.0
Revision: 0
Date: 21 March 2005
Product ID: MYD10
ESDT MYD10_L2
Product name: Snow Cover
Product Level: 2
Point of Contact: George Riggs
SSAI
NASA, GSFC, Code 614.1
Greenbelt, MD 20771
301-614-5650
George.A.Riggs.1@gsfc.nasa.gov
Hugh Powell
NASA, GSFC, Code 614.1
Greenbelt, MD 20771
301-286-2310
Hugh.W.Powell.1@gsfc.nasa.gov
Principal Investigator: Vincent V. Salomonson
NASA, GSFC, Code 610
Greenbelt, MD 20771
301-614-5631
Vincent.V.Salomonson@nasa.gov
Associate Investigator: Dorothy K. Hall
NASA, GSFC, Code 614.1
Greenbelt, MD 20771
301-614-5771
Dorothy.K.Hall@nasa.gov
Description:
A general description of the global metadata is given.
Descriptions of the SDSs are given along with a listing of the local
attributes, dimensions, and content of the SDSs.
The L2 snow cover data product is generated from swaths of MODIS L1B
product (MYD02HKM and MYD021KM) and data from the GEO product (MYD03)
and the cloud mask product (MYD35_L2). The HDF-EOS data productfile
consists of 12 global attributes, and five SDSs with local attributes.
The data product and algorithm are described in the MODIS Snow Data
Product User Guide (http//modis-snow-ice.gsfc.nasa.gov/). The user
should refer to the guide for detailed descriptions of the product,
how to interpret the product, and metadata.
Only technical details of the data product content are given in this product
file specification.
Contents:
SDS names:
Snow_Cover
Snow_Cover_Pixel_QA
Fractional_Snow_Cover
Latitude
Longitude
Note: The Latitude and Longitude SDSs contain coarse
reslolution, 5 km data useful for geolocating or mapping the data.
ECS Metadata:
CoreMetadata.0
ArchiveMetadata.0
StructMetadata.0
ECS Metadata
Name: Type: Num_Val: Source: Value:
CoreMetadata.0 PVL-STRING 1 SDPTK Variable
LocalGranuleID STRING 1 PGE Variable
SizeMBECSDataGranule DOUBLE 1 DSS Variable
ProductionDateTime DATETIME 1 TK Variable
DayNightFlag STRING 1 PGE Variable
ReprocessingActual STRING 1 PGE Variable
LocalVersionID STRING 1 PGE Variable
ReprocessingPlanned STRING 1 PGE Variable
ScienceQualityFlag STRING 1 DP Variable
AutomaticQualityFlagExplanation
STRING 1 PGE Variable
AutomaticQualityFlag STRING 1 PGE Variable
OperationalQualityFlagExplanation
STRING 1 PGE Variable
OperationalQualityFlag STRING 1 PGE Variable
ScienceQualityFlagExplanation
STRING 1 PGE Variable
QAPercentMissingData INTEGER 1 PGE Variable
QAPercentCloudCover INTEGER 1 PGE Variable
ParameterName STRING 1 PGE "Snow Cover"
EquatorCrossingDate DATE 1 PGE Variable
EquatorCrossingTime TIME 1 PGE Variable
OrbitNumber INTEGER 1 PGE Variable
EquatorCrossingLongitude
DOUBLE 1 PGE Variable
VersionID INTEGER 1 MCF 5
ShortName STRING 1 MCF "MYD10_L2"
InputPointer STRING 4 PGE Variable
GRingPointLatitude DOUBLE 4 PGE Variable
GRingPointLongitude DOUBLE 4 PGE Variable
GRingPointSequenceNo INTEGER 4 PGE Variable
ExclusionGRingFlag STRING 1 PGE Variable
RangeBeginningDate DATE 1 PGE Variable
RangeBeginningTime TIME 1 PGE Variable
RangeEndingDate DATE 1 PGE Variable
RangeEndingTime TIME 1 PGE Variable
PGEVersion STRING 1 PGE Variable
AncillaryInputPointer STRING M PGE Variable
AncillaryInputType STRING M PGE "Geolocation"
AssociatedSensorShortName
STRING 1 MCF "MODIS"
AssociatedPlatformShortName
STRING 1 MCF "Aqua"
AssociatedInstrumentShortname
STRING 1 MCF "MODIS"
**Product Specific Attributes (PSA)**
AdditionalAttributeName.1 STRING M PGE QAPERCENTGOODQUALITY
ParameterValue.1 STRING 1 PGE Variable
AdditionalAttributeName.2 STRING M PGE QAPERCENTOTHERQUALITY
ParameterValue.2 STRING 1 PGE Variable
AdditionalAttributeName.3 STRING M PGE GRANULENUMBER
ParameterValue.3 STRING 1 PGE Variable
AdditionalAttributeName.4 STRING M PGE SNOWCOVERPERCENT
ParameterValue.4 STRING 1 PGE Variable
End CoreMetadata.0 _________________________________
ArchiveMetadata.0 STRING 1 PGE Variable
This string will contain the following PVL fields:
AlgorithmPackageAcceptanceDate STRING 1 PGE Variable
AlgorithmPackageMaturityCode STRING 1 PGE Variable
AlgorithmPackageName STRING 1 PGE Variable
AlgorithmPackageVersion STRING 1 PGE Variable
LongName STRING 1 MCF "MODIS/Aqua Snow Cover 5-Min
L2 Swath 500m"
InstrumentName STRING 1 MCF "Moderate-Resolution
Imaging SpectroRadiometer"
LocalInputGranuleID STRING 4 PGE Variable
ProcessingCenter STRING 1 PGE "MODAPS"
ProcessingEnvironment STRING 1 PGE Variable
ProcessingDateTime STRING 1 PGE Variable
SPSOParameters STRING 1 PGE "none"
EastBoundingCoordinate DOUBLE 1 PGE Variable
WestBoundingCoordinate DOUBLE 1 PGE Variable
NorthBoundingCoordinate DOUBLE 1 PGE Variable
SouthBoundingCoordinate DOUBLE 1 PGE Variable
DESCRevision STRING 1 MCF Variable
ProductionHistory STRING 1 PGE Variable
End ArchiveMetadata.0 _________________________________
StructMetadata.0 STRING 1 HDFEOSTK
GROUP=SwathStructure
GROUP=SWATH_1
SwathName="MOD_Swath_Snow"
GROUP=Dimension
OBJECT=Dimension_1
DimensionName="Along_swath_lines_500m"
Size=4060
END_OBJECT=Dimension_1
OBJECT=Dimension_2
DimensionName="Cross_swath_pixels_500m"
Size=2708
END_OBJECT=Dimension_2
OBJECT=Dimension_3
DimensionName="Coarse_swath_lines_5km"
Size=406
END_OBJECT=Dimension_3
OBJECT=Dimension_4
DimensionName="Coarse_swath_pixels_5km"
Size=271
END_OBJECT=Dimension_4
END_GROUP=Dimension
GROUP=DimensionMap
OBJECT=DimensionMap_1
GeoDimension="Coarse_swath_pixels_5km"
DataDimension="Cross_swath_pixels_500m"
Offset=5
Increment=10
END_OBJECT=DimensionMap_1
OBJECT=DimensionMap_2
GeoDimension="Coarse_swath_lines_5km"
DataDimension="Along_swath_lines_500m"
Offset=5
Increment=10
END_OBJECT=DimensionMap_2
END_GROUP=DimensionMap
GROUP=IndexDimensionMap
END_GROUP=IndexDimensionMap
GROUP=GeoField
OBJECT=GeoField_1
GeoFieldName="Latitude"
DataType=DFNT_FLOAT32
DimList=("Coarse_swath_lines_5km","Coarse_swath_pixels_5km")
END_OBJECT=GeoField_1
OBJECT=GeoField_2
GeoFieldName="Longitude"
DataType=DFNT_FLOAT32
DimList=("Coarse_swath_lines_5km","Coarse_swath_pixels_5km")
END_OBJECT=GeoField_2
END_GROUP=GeoField
GROUP=DataField
OBJECT=DataField_1
DataFieldName="Snow_Cover"
DataType=DFNT_UINT8
DimList=("Along_swath_lines_500m","Cross_swath_pixels_500m")
END_OBJECT=DataField_1
OBJECT=DataField_2
DataFieldName="Snow_Cover_Pixel_QA"
DataType=DFNT_UINT8
DimList=("Along_swath_lines_500m","Cross_swath_pixels_500m")
END_OBJECT=DataField_2
OBJECT=DataField_3
DataFieldName="Fractional_Snow_Cover"
DataType=DFNT_UINT8
DimList=("Along_swath_lines_500m","Cross_swath_pixels_500m")
END_GROUP=DataField
GROUP=MergedFields
END_GROUP=MergedFields
END_GROUP=SWATH_1
END_GROUP=SwathStructure
GROUP=GridStructure
END_GROUP=GridStructure
GROUP=PointStructure
END_GROUP=PointStructure
End StructMetadta.0 -----------------------------------
HDF Global Attributes
L1BCalibrationQuality DFNT_CHAR 1 PGE Variable
L1BMissionPhase DFNT_CHAR 1 PGE Varialbe
L1BNadirPointing DFNT_CHAR 1 PGE Variable
L1BVersionID DFNT_CHAR 1 PGE Variable
SCF Algorithm Version DFNT_CHAR 1 PGE Variable
Surface_Temperature_Screen_Threshold
DFNT_CHAR 1 PGE Variable
HDFEOS_FractionalOffset_Along_swath_lines_500m_MOD_Swath_Snow
DFNT_FLOAT32 1 PGE Variable
HDFEOS_FractionalOffset_Cross_swath_pixels_500m_MOD_Swath_Snow
DFNT_FLOAT32 1 PGE Variable
===============================================================================
SDS Definition
SDS Name: Snow_Cover
Description: Snow cover is identified by the algorithm for every
daylight land pixel in the granule. Occurance of
snow-coverd-inland waters (snow-covered lake ice class)
is also identified. Thematic snow map is output.
Refer to the Snow Product User Guide for detailed
explanation of technique and results.
Number Type: DFNT_UINT8
Rank: 2
Dimension sizes:("Cross_swath_pixels_500m", "Along_swath_lines_500m")
Dimension Names:
Dimension0: "Along_swath_lines_500m"
Dimension1: "Cross_swath_pixels_500m"
SDS Local Attributes:
Name: Type: Num_val: Source: Value:
HDF Predefined Attributes...
long_name DFNT_CHAR string length PGE "Snow covered land"
units DFNT_CHAR string length PGE "none"
format DFNT_CHAR string length PGE "I3"
coordsys DFNT_CHAR string length PGE "cartesian"
valid_range DFNT_UINT8 2 PGE 0,254
_FillValue DFNT_UNIT8 1 PGE 255
Custom Attributes...
Key: DFNT_CHAR8 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
Nadir_data_resolution DFNT_CHAR string length PGE "500 m"
Valid EV Obs Band 1 (%) DFNT_FLOAT32 1 PGE Variable
Valid EV Obs Band 2 (%) DFNT_FLOAT32 1 PGE Variable
Valid EV Obs Band 4 (%) DFNT_FLOAT32 1 PGE Variable
Valid EV Obs Band 7 (%) DFNT_FLOAT32 1 PGE Variable
Saturated EV Obs Band 1 (%) DFNT_FLOAT32 1 PGE Variable
Saturated EV Obs Band 2 (%) DFNT_FLOAT32 1 PGE Variable
Saturated EV Obs Band 4 (%) DFNT_FLOAT32 1 PGE Variable
Saturated EV Obs Band 7 (%) DFNT_FLOAT32 1 PGE Variable
===============================================================================
SDS Definition
SDS Name: Snow_Cover_Pixel_QA
Description: QA to show where there was good or other
quality data. Areas not processed carry special
mask values. See the Snow Users Guide for
detailed explanation.
Number Type: DFNT_UINT8
Rank: 2
Dimension sizes:("Cross_swath_pixels_500m", "Along_swath_lines_500m")
Dimension Names:
Dimension0: "Along_swath_lines_500m"
Dimension1: "Cross_swath_pixels_500m"
SDS Attributes:
Name: Type: Num_val: Source: Value:
HDF Predefined Attributes...
long_name DFNT_CHAR string length PGE "Snow cover per pixel thematic QA"
units DFNT_CHAR string length PGE "none"
format DFNT_CHAR string length PGE "I3"
coordsys DFNT_CHAR string length PGE "cartesian"
valid_range DFNT_UINT8 2 PGE 0,254
_Fillvalue DFNT_UNIT8 1 PGE 255
Custom Attributes...
Key: DFNT_CHAR8 0=good quality, 1=other quality, 252=Antarctica mask, 253=land mask, 254=ocean mask, 255=fill
===============================================================================
SDS Definition
SDS Name: Fractional_Snow_Cover
Description: Fractional snow cover determined for a 500m pixel.
Fractional snow cover also determined for
snow-coverd-inland waters
Number Type: DFNT_UINT8
Rank: 2
Dimension sizes:("Cross_swath_pixels_500m", "Along_swath_lines_500m")
Dimension Names:
Dimension0: "Along_swath_lines_500m"
Dimension1: "Cross_swath_pixels_500m"
SDS Local Attributes:
Name: Type: Num_val: Source: Value:
HDF Predefined Attributes...
long_name DFNT_CHAR string length PGE "Fractional snow cover, 500m"
units DFNT_CHAR string length PGE "none"
format DFNT_CHAR string length PGE "I3"
coordsys DFNT_CHAR string length PGE "cartesian"
valid_range DFNT_UINT8 2 PGE 0,254
_FillValue DFNT_UNIT8 1 PGE 255
Custom Attributes...
Key: DFNT_CHAR8 0-100=fractional snow, 200=missing data, 201=no decision, 211=night, 225=land, 237=inland water, 239=ocean, 250=cloud, 254=detector saturated, 255=fill
Nadir_data_resolution DFNT_CHAR8 500 m
===============================================================================
SDS Definition
SDS Name: Latitude
Description: Coarse resolution latitude data for geolocation purposes.
Number Type: DFNT_FLOAT32
Rank: 2
Dimension sizes:("Coarse_swath_lines_5km", "Coarse_swath_pixels_5km")
Dimension Names:
Dimension0: "Coarse_swath_pixels_5km"
Dimension1: "Coarse_swath_lines_5km"
SDS Attributes:
Name: Type: Num_val: Source: Value:
HDF Predefined Attributes...
long_name DFNT_INT8 1 PGE "Coarse 5 km resolution lat itude"
units DFNT_CHAR 1 PGE "degrees"
valid_range DFNT_FLOAT32 2 PGE -90.000, 90.000
_FillValue DFNT_FLOAT32 1 PGE -999.000
Local Attributes
source DFNT_CHAR 1 PGE "MYD03 geolocation product; data read from center pixel in 5 km box"
===============================================================================
SDS Definition
SDS Name: Longititude
Description: Coarse resolution longititude data for geolocation purposes.
Number Type: DFNT_FLOAT32
Rank: 2
Dimension sizes:("Coarse_swath_lines_5km", "Coarse_swath_pixels_5km")
Dimension Names:
Dimension0: "Coarse_swath_pixels_5km"
Dimension1: "Coarse_swath_lines_5km"
SDS Attributes:
Name: Type: Num_val: Source: Value:
HDF Predefined Attributes...
long_name DFNT_INT8 1 PGE "Coarse 5 km resolution long itude"
units DFNT_CHAR 1 PGE "degrees"
valid_range DFNT_FLOAT32 2 PGE -180.000, 180.000
_FillValue DFNT_FLOAT32 1 PGE -999.000
Local Attributes
source DFNT_CHAR 1 PGE "MYD03 geolocation product; data read from center pixel in 5 km box"