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 |
Comments |
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 43.9668888867059 26.6986732791391 29.9350067242648 |
| GringPointLongitude | Geographic longitude bounds of swath coverage. | 18.1975758658798 48.3580849897086 40.397145450837 16.5230375402673 |
| 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 http://landweb.nascom.nasa.gov/cgi-bin/QA_WWW/qaFlagPage.cgi?sat=terra 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 |
The CoreMetadata.0 product specific metadata attributes can be found by using most search tools.
Object Name |
Comments |
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 |
Comment |
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, MOD03.A2003018.0850.005.2006096190808.hdf |
| DescrRevision | 5.0 | |
| ProcessingEnvironment | Linux minion5035 2.6.8.1-26mdksmp #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.
These attributes are specific to the MOD10L2 and MYD10L2 snow cover product.
Attribute Name |
Comment |
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 |
