MOD10_L2 and MYD10_L2 Global Snow Cover Attributes, Version 5

The MOD10_L2 and MYD10_L2 snow cover product data files 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 (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
Sample Value
ShortName Earth Science Data Type (ESDT), name of product. MOD10_L2
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 MOD10_L2.A2003018.0850.005.2006114140551.hdf
DayNightFlag Snow will have either day or both. Day
ProductionDateTime Time granule was produced. 2006-04-24T14:07:21.000Z
LocalVersionID Version of algorithm delivered from the Science Computing Facility (SCF). SCF V5.0.4
PGEVersion Version of product generation executable. 5.0.7
InputPointer Input data files used to create this product. MOD02HKM.A2003018.0850.005.2006101121411.hdf, MOD021KM.A2003018.0850.005.2006101121411.hdf, MOD35_L2.A2003018.0850.005.2006101163640.hdf, MOD03.A2003018.0850.005.2006096190808.hdf
RangeBeginningDate Beginning date of the first scan line in the swath. 2003-01-18
RangeBeginningTime Beginning time of the first scan line in the swath. 08:50:00.000000
RangeEndingDate Ending date of the last scan line in the swath. 2003-01-18
RangeEndingTime Ending time of the last scan line in the swath. 08:55:00.000000
ExclusionGringFlag N
GringPointLatitude Geographic latitude bounds of swath coverage. 48.3023932188235
GringPointLongitude Geographic longitude bounds of swath coverage. 18.1975758658798
GringPointSequenceNo 1,2,3,4
OrbitNumber 16412
EquatorCrossingLongitude 21.953256171555
EquatorCrossingDate 2003-01-18
EquatorCrossingTime 09:03:02.194649
ParameterName Parameter for which QA statistics are given in this metadata object. Snow Cover
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
QAPercentCloudCover 34
AncillaryInputPointer Location of geolocation input product in production system. MOD03.A2003018.0850.005.2006096190808.hdf
AncillaryInputType Type of ancillary data referenced by pointer. Geolocation
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.

Object Name
Sample Value
QAPercentGoodQuality Summary quality assurance statistics for data product. 90
QAPercentOtherQuality 3
GranuleNumber Unique granule identifier. 254
SnowCoverPercent Summary percentage of snow-covered land. 07



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
Sample Value
EastBoundingCoordinate Extent of swath coverage in latitude and longitude. 48.3549361672515
WestBoundingCoordinate 16.5452762107832
NorthBoundingCoordinate 48.2836681567257
SouthBoundingCoordinate 26.7862337500816
AlgorithmPackageAcceptanceDate Algorithm descriptors. 05-2005
AlgorithmPackageMaturityCode Normal
AlgorithmPackageName MOD_PR10
AlgorithmPackageVersion 5
InstrumentName Moderate-Resolution Imaging SpectroRadiometer
ProcessingDateTime 2006-04-24T14:07:21.000Z
LongName MODIS/Terra Snow Cover 5-Min L2 Swath 500m
ProcessingCenter MODAPS
SPSOParameters None
LocalInputGranuleID Names of input files. MOD02HKM.A2003018.0850.005.2006101121411.hdf, MOD021KM.A2003018.0850.005.2006101121411.hdf, MOD35_L2.A2003018.0850.005.2006101163640.hdf,
DescrRevision 5.0
ProcessingEnvironment Linux minion5035 #1 SMP Mon Nov 28 12:40:04 MST 2005 i686 Intel(R) Xeon(TM) CPU 2.80GHz unknown GNU/Linux



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 MOD10L2 and MYD10L2 snow cover product.

Attribute Name
Sample Value
HDFEOSVersion Version of HDF-EOS Toolkit. HDFEOS_V2.a
L1BCalibrationQuality MODIS data general quality indicator. marginal
L1BMissionPhase Execution
L1BNadirPointing Yes
L1BVersionID Version of L1B processing algorithm. 2000-02-24
SCFAlgorithmVersion $Id: MOD_PR10_AAmain.c,v 1.2 2006/01/19 23:19:52 powell Exp $
$Id: MOD_PR10_ActionMessages.h,v 1.1 2005/05/19 16:15:52 powell Exp $
$Id: MOD_PR10.h,v 1.4 2006/01/20 15:52:02 powell Exp $
$Id: MOD_PR10_Process_L1B.c,v 1.2 2005/05/19 18:18:15 powell Exp $
$Id: MOD_PR10_Compute_SfcTemp.c,v 1.2 2005/05/19 18:15:12 powell Exp $
$Id: MOD_PR10_Process_SnowFile.c,v 1.2 2005/05/19 18:18:59 powell Exp $
$Id: MOD_PR10_CopyL1BmetaToSnow.c,v 1.2 2005/05/19 18:15:48 powell Exp $
$Id: MOD_PR10_CopyGEOmetaToSnow.c,v 1.2 2005/05/19 18:14:18 powell Exp $
$Id: MOD_PR10_Process_GEO.c,v 1.1 2005/05/19 17:30:23 powell Exp $
$Id: MOD_PR10_Process_Cloud.c,v 1.1 2005/05/19 17:30:23 powell Exp $
$Id: MOD_PR10_Process_5kmSnowFile.c,v 1.2 2005/05/19 18:17:29 powell Exp $
$Id: MOD_PR10_Compute_Snow.c,v 1.3 2006/01/20 15:53:49 powell Exp $
$Id: MOD_PR10_Compute_FractionalSnow.c,v 1.4 2006/01/20 15:53:02 powell Exp $
$Id: MOD_PR10_UpdateCounts.c,v 1.1 2005/05/19 17:30:23 powell Exp $

$Id: MOD_PR10_MakeMeta.c,v 1.2 2005/05/19 18:16:34 powell Exp
Surface_Temperature_Screen_Threshold Temperature above which a pixel can not be classified as snow. 283.0
Shadowed_Land_Screen_Threshold The difference in reflectance of MODIS Band 4 - Band 5 must be greater than this for a pixel to be mapped as snow. 0.20
HDFEOS_FractionalOffset_Along_swath_lines_500m_MOD_Swath_Snow Fractional offset add to the along swath direction offset found in the HDFEOS structural metadata in order to correctly geolocate the data. 0.5
HDFEOS_FractionalOffset_Cross_swath_pixels_500m_MOD_Swath_Snow Fractional offset add to the cross swath direction offset found in the HDFEOS structural metadata in order to correctly geolocate the data. 0.0