MOD10A2 and MYD10A2 Global Snow Cover Attributes, Version 5

The MODIS 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. Many of 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 QA 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 Comments Sample Value
ShortName Earth Science Data Type (ESDT) name of product MOD10A2
VersionID ECS Version 5
ReprocessingActual Reprocessed or not reprocessed reprocessed
ReprocessingPlanned Expect that products will be reprocessed at least once further update is anticipated
LocalGranuleID MOD10A2.A2000129.h07v03.005.2006223085826.hdf
DayNightFlag Snow will have either Day or Both Day
ProductionDateTime Time granule was produced 2006-08-11T08:58:31.000Z
LocalVersionID Version of algorithm delivered from the Science Computing Facility (SCF) SCF V5.0.0
PGEVersion Version of PGE in MODAPS 5.0.6
InputPointer Names of input files MOD10A1.A2000129.h07v03.005.2006206165829.hdf MOD10A1.A2000130.h07v03.005.2006207032309.hdf MOD10A1.A2000131.h07v03.005.2006207081316.hdf MOD10A1.A2000132.h07v03.005.2006208043936.hdf MOD10A1.A2000133.h07v03.005.2006207181915.hdf MOD10A1.A2000134.h07v03.005.2006208022537.hdf MOD10A1.A2000135.h07v03.005.2006208160657.hdf MOD10A1.A2000136.h07v03.005.2006208215150.hdf
RangeBeginningDate Beginning date of the first data used in the product 2000-05-08
RangeBeginningTime Beginning time of the first data used in the product 00:00:00
RangeEndingDate Ending date of the last data used in the product 2000-05-15
RangeEndingTime Ending time of the last data used in the product 23:59:59
ExclusionGringFlag N
GringPointLatitude Geographic latitude bounds of tile coverage 48.9382100186222
GringPointLongitude Geographic longitude bounds of tile coverage -178.802776237407
GringPointSequenceNo 1,2,3,4
ParameterName Parameter for which QA statistics are given in this metadata object Maximum Snow Extent
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 See for the product Science Quality status
QAPercentMissingData 0-100 0
QAPercentCloudCover 0-100 1
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 Comments Sample Value
QAPercentGoodQuality Summary quality assessment statistics for data product. Note: pixels identified as cloud are considered good quality 100
QAPercentOtherQuality 0
HorizontalTileNumber Horizontal position in Sinusoidal Grid (SIN) 7
VerticalTileNumber Vertical position in SIN 3
TileID Coded tile identifier 51007003
SnowCoverPercent Summary percentage of snow-covered land 9


These attributes contain 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 Comment Sample Value
CharacteristicBinAngularSize 15.0
CharacteristicBinSize 463.312716527778
DataColumns 2400
DataRows 2400
GlobalGridColumns 86400
GlobalGridRows 43200
AlgorithmPackageAcceptanceDate Algorithm descriptors 01-2005
AlgorithmPackageMaturityCode Normal
AlgorithmPackageName MOD_PR10A2
AlgorithmPackageVersion 5
InstrumentName Moderate Resolution Imaging Spectroradiometer
PlatformShortName Terra
ProcessingDateTime 2006-08-11T08:58:26.000Z
LongName MODIS/Terra Snow Cover 8-Day L3 Global 500m SIN Grid
ProcessingCenter MODAPS
SPSOParameters None
LocalInputGranuleID Names of input files MOD10A1.A2000129.h07v03.005.2006206165829.hdf, MOD10A1.A2000130.h07v03.005.2006207032309.hdf, MOD10A1.A2000131.h07v03.005.2006207081316.hdf, MOD10A1.A2000132.h07v03.005.2006208043936.hdf, MOD10A1.A2000133.h07v03.005.2006207181915.hdf, MOD10A1.A2000134.h07v03.005.2006208022537.hdf, MOD10A1.A2000135.h07v03.005.2006208160657.hdf, MOD10A1.A2000136.h07v03.005.2006208215150.hdf
EastBoundingCoordinate Extent of tile coverage in latitude and longitude -155.559418292319
WestBoundingCoordinate -179.999999964708
NorthBoundingCoordinate 56.2583333282812
SouthBoundingCoordinate 49.9999999955098
DescrRevision Version of MCF used 5.0
ProcessingEnvironment IRIX64 mtvs3 6.5 10070055 IP35


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 MOD10A2 and MYD10A2 snow cover product.

Attribute Name Comment Sample Value
HDFEOSVersion Version of HDF-EOS Toolkit HDFEOS_V2.9
Number of Input Days Number of days input to the product (range 2-8) 8
Days Input Year days of input in chronological order 2000-129, 2000-130, 2000-131, 2000-132, 2000-133, 2000-134, 2000-135, 2000-136
Eight Day Period Days in the eight-day period 2000-129, 2000-136
SCF Algorithm Version Internal SCF version

$Id: MOD_PR10A2.AAmain.c,v 1.7 2002/05/01 19:15:30 powell Exp $
$Id: MOD_PR10A2.ActionMessages.h,v 1.3 1999/03/12 20:46:52 powell Exp $
$Id: MOD_PR10A2.h,v 1.9 2003/12/10 13:42:04 powell Exp $
$Id: MOD_PR10A2.CopyInputMeta.c,v 1.5 2003/11/20 12:41:53 powell Exp $
$Id: MOD_PR10A2.CopyGridStructure.c,v 1.3 1999/03/12 20:43:53 powell Exp $
$Id: MOD_PR10A2.InputOutput.c,v 1.5 2003/11/20 12:44:47 powell Exp $
$Id: MOD_PR10A2.ProcessDailySnowDay.c,v 1.4 2003/11/20 12:46:59 powell Exp $
$Id: MOD_PR10A2.CodeProducedMeta.c,v 1.12 2003/12/10 13:16:41 powell Exp $