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MOD10A1 and MYD10A1 Global Snow Cover Attributes, Version 5

The MOD10A1 and MYD10A1 snow cover products include three Earth Observing System Data and Information System (EOSDIS) Core System (ECS) global attributes. These global attributes are stored as character strings in Parameter Value Language (PVL) format. Also, these global attributes as well as other attributes can be found in the associated metadata file, and are formatted as Extensible Markup Language (XML). The metadata file should be examined to determine if post-production changes were made to the metadata. Post-production metadata changes are not updated in the data file. Changes such as Quality Assessment updates are only reflected in the metadata file.

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Also known as inventory metadata, core metadata are used to populate the EOSDIS Core System (ECS) inventory, which allows users to locate granules of interest.

Object Name
Sample Value
ShortName Earth Science Data Type, name of product. MOD10A1
VersionID ECS Version. 5
ReprocessingActual Number of times processed. Reprocessed
ReprocessingPlanned Expect that products will be reprocessed at least once. Further update is anticipated
LocalGranuleID MOD10A1.A2000055.h12v03.005.2006182183900.hdf
DayNightFlag Snow will have either day or both. Day
ProductionDateTime Time granule was produced. 2006-07-01T18:40:23.000Z
LocalVersionID Version of algorithm delivered from the Science Computing Facility. SCF V5.0.5
PGEVersion Version of production generation executable. 5.0.9
InputPointer Input data files used to create this product. MOD10L2G.A2000055.h12v03.005.2006182162007.hdf
RangeBeginningDate Beginning date of the first scan line in the swath. 2000-02-24
RangeBeginningTime Beginning time of the first scan line in the swath. 16:40:00.000000
RangeEndingDate Ending date of the last scan line in the swath. 2000-02-24
RangeEndingTime Ending time of the last scan line in the swath. 20:05:00.000000
ExclusionGringFlag N
GringPointLatitude Geographic latitude bounds of swath coverage. 49.6360033343828
GringPointLongitude Geographic longitude bounds of swath coverage. -93.9224688010982
GringPointSequenceNo 1,2,3,4
OrbitNumber 995
EquatorCrossingLongitude -93.8082345793327
EquatorCrossingDate 2000-02-24
EquatorCrossingTime 18:38:52.375157
ParameterName Parameter for which QA statistics are given in this metadata object. Snow_Cover_Daily_Tile
AutomaticQualityFlag Result of automated checks during the run of the algorithm that screens for significant amounts of anomalous data. Passed
AutomaticQualityFlagExplanation Explanation of result of automated QA checks made during execution. No automatic quality assessment done in the PGE
ScienceQualityFlag Set by snow investigator after post-production investigation. Not investigated
ScienceQualityFlagExplanation Explanation of science flag. Visit for the product Science Quality status.
QAPercentMissingData 0-100 0
QAPercentCloudCover 0-100 50
AssociatedPlatformShortName Terra
AssociatedInstrumentShortName MODIS
AssociatedSensorShortName MODIS

CoreMetadata.0 Product Specific Attributes (PSAs)

The CoreMetadata.0 product specific metadata attributes can be found by using most search tools. Also, when using certain interfaces for tile numbers, these attributes may be used as search criteria to restrict searches.

Object Name
Sample Value
QAPercentGoodQuality Summary quality assessment statistics for data product. 85
QAPercentOtherQuality 15
HorizontalTileNumber 12
VerticalTileNumber 03
TileID 51012003
SnowCoverPercent Summary percentage of snow-covered land. 39


These attributes contains information relevant to production of the data product. They also contain an alternate bounding of geographic coverage of the swath. These data are useful in determining what version of the algorithm was used to generate the product.

Object Name
Sample Value
CharacteristicBinAngularSize 15.0
CharacteristicBinSize 463.312716527778
GEOAnyAbnormal False
GEOEstMaxRMSError 50.0
DataColumns 2400
DataRows 2400
GlobalGridColumns 86400
GlobalGridRows 43200
AlgorithmPackageAcceptanceDate Algorithm descriptors. 12-2005
AlgorithmPackageMaturityCode Normal
AlgorithmPackageName MOD_PR10A1
AlgorithmPackageVersion 5
InstrumentName Moderate Resolution Imaging Spectroradiometer
PlatformShortName Terra
ProcessingDateTime 2006-07-01T18:39:00.000Z
LongName MODIS/Terra Snow Cover Daily L3 Global 500m SIN Grid
Processing Center MODAPS
SPSOParameters None
LocalInputGranuleID Names of input files. MOD10L2G.A2000055.h12v03.005.2006182162007.hdf, MODMGGAD.A2000055.h12v03.005.2006182145121.hdf, MODPTHKM.A2000055.h12v03.005.2006182144946.hdf, MOD09GHK.A2000055.h12v03.005.2006182153902.hdf, MOD12Q1.A2001001.h12v03.004.2004358134131.hdf
EastBoundingCoordinate Extent of swath coverage, in latitude and longitude. -77.7732269635488
WestBoundingCoordinate -119.999999969677
NorthBounding Coordinate 59.9999999946118
SouthBounding Coordinate 49.9999999955098
DESCRRevision Version of MCF used. 5.2
ProcessingEnvironment Linux minion5031 #1 SMP Mon Nov 28 12:40:04 MST 2005 i686


These attributes specify the content and structure of an HDF-EOS file and are not discussed further here. For more information, please see the 2001 white paper titled An HDF-EOS and Data Formatting Primer for the ECS Project.

Product Specific Global Attributes

These attributes are specific to the MOD10A1 and MYD10A1 snow cover product.

Attribute Name
Sample Value
HDFEOSVersion Version of HDF-EOS Toolkit. HDFEOS_V2.9
L2GAutomaticQualtifyFlag Passed
L2GAutomaticQualityFlagExplanation Output file is created and good
L2GCoverageCalculationMethod Volume
L2GNumberOfOverlapGranules Number of input granules with data falling in the tile. 4
L2GFirstLayerSelectionCriteria Order of input pointer
MOD10InputGranuleNames Listing of input files used to make the data product. MOD10_L2.A2000055.1640.005.2006181104401.hdf, MOD10_L2.A2000055.1645.005.2006181104621.hdf, MOD10_L2.A2000055.1820.005.2006181104509.hdf, MOD10_L2.A2000055.1955.005.2006181104242.hdf, MOD10_L2.A2000055.2000.005.2006181104538.hdf
SCF Algorithm Version Internal SCF version. $Id: MOD_PR10A1_AAmain...