MODIS Land Surface Temperature/Emissivity Daily L3 Global 1km (MYD21A1N)
Description:

The new MODIS Land Surface Temperature and Emissivity (LST&E) product (MOD21) available in Collection 6 uses a physics-based algorithm to dynamically retrieve both the LST and Emissivity simultaneously for the three MODIS thermal infrared bands (29, 31 and 32) at a spatial resolution of 1 km at nadir. The MOD21 product address the documented cold bias of 3-5 K in the MOD11 heritage split-window products. The MOD21 algorithm is based on the ASTER Temperature Emissivity Separation (TES) algorithm, which uses full radiative transfer simulations for the atmospheric correction, and an emissivity model based on the variability in the surface radiance data to dynamically retrieve both LST and spectral emissivity. The TES algorithm is combined with an improved Water Vapor Scaling (WVS) atmospheric correction scheme to stabilize the retrieval during very warm and humid conditions. Simulations and validation results available in the ATBD have shown consistent accuracies at the 1 K level over all land surface types including vegetation, water, and deserts.

The MOD21 product will include a swath (scene) Level-2 daily product, and daily and eight-day Level 3 gridded products in sinusoidal projection.

Point of Contact:
      Glynn C. Hulley (PI) 

Principal Investigator(s):
      Glynn C. Hulley (PI) 
      MS 183-509 
      Jet Propulsion Laboratory 
      4800 Oak Grove Dr. 
      Pasadena, CA 91109 

============================================================================
General Construct
There are total 7 scientific data fields.

LST_1KM
QC
View_Angle
View_Time
Emis_29
Emis_31
Emis_32
#######################################################

	LST_1KM
             DATA_Rank: 2
             DATA_Dims:
                YDim:MODIS_Grid_Daily_1km_LST21 1200
                XDim:MODIS_Grid_Daily_1km_LST21 1200
             DATA_Type: uint16
             DATA_DimensionSizes:[1200][1200]
             Compression:  Gzip
             Gzip_level: 4
             Chunk_sizes:    2  0
             long_name:  Daily 1km Land-surface Temperature
             units:  K
             scale_factor:    0.020000
             add_offset:    0.000000
             valid_range:    7500  65535
             _FillValue:    0

	QC
             DATA_Rank: 2
             DATA_Dims:
                YDim:MODIS_Grid_Daily_1km_LST21 1200
                XDim:MODIS_Grid_Daily_1km_LST21 1200
             DATA_Type: uint16
             DATA_DimensionSizes:[1200][1200]
             Compression:  Gzip
             Gzip_level: 4
             Chunk_sizes:    2  0
             long_name:  Daily QC for LST and emissivity
             units:  n/a
             scale_factor:  n/a
             add_offset:  n/a
             valid_range:    0  65535
             _FillValue:  n/a
             QA Legend:  Bit Fields Description (Right to Left):
                [0-1]: MODLAND_QA 
                 00: Pixel produced, good quality
                  01: Pixel produced, but check other QA
                  10: Pixel produced, but most probably cloudy
                  11: Pixel not produced due to other reasons than clouds
                  
                [2-3]: Data Quality Flag
                  00: Good data quality of L1B bands 29,31,32
                 01: Missing Pixel
                  10: Fairly calibrated
                  11: Poorly calibrated, TES processing skipped
                  
                [4-5]: Cloud Flag
                  00: Cloud free
                  01: Thin Cirrus
                  10: Pixel within 2 pixels of nearest cloud (~2km)
                  11: Cloudy pixel
                  
                [6-7]: Iterations
                  00: >=7 (Slow convergence)
                  01: = 6 (Nominal)
                  10: = 5 (Nominal)
                  11: = <5 (Fast)
                  
                [8-9]: Atmospheric Opacity
                  00: >=3 (Warm, humid air; or cold land)
                  01: 0.2 - 0.3 (Nominal value)
                  10: 0.1 - 0.2 (Nominal value)
                  11: <0.1 (Dry, or high altitude pixel)
                  
                [10 - 11]: MMD
                  00: > 0.15 (Most silicate rocks)
                  01: 0.1 - 0.15 (Rocks, sand, some soils)
                  10: 0.03 - 0.1 (Mostly soils, mixed pixel)
                  11: <0.03 (Vegetation, snow, water, ice, some soils)
                 
                [12 - 13]: Emissivity accuracy
                  00: >0.02 (Poor performance)
                  01: 0.015 - 0.02 (Marginal performance)
                  10: 0.01 - 0.015 (Good performance)
                 11: <0.01 (Excellent performance)
                 
                [14 - 15]: LST accuracy
                  00: >2K (Poor performance)
                  01: 1.5 - 2K (Marginal performance)
                  10: 1 - 1.5K (Good performance)
                 11: < 1K (Excellent performance)

	View_Angle
             DATA_Rank: 2
             DATA_Dims:
                YDim:MODIS_Grid_Daily_1km_LST21 1200
                XDim:MODIS_Grid_Daily_1km_LST21 1200
             DATA_Type: uint8
             DATA_DimensionSizes:[1200][1200]
             Compression:  Gzip
             Gzip_level: 4
             Chunk_sizes:    2  0
             long_name:  View zenith angle of LST
             units:  deg
             scale_factor:    1.000000
             add_offset:    -65.000000
             valid_range:    0  130
             _FillValue:    255

	View_Time
             DATA_Rank: 2
             DATA_Dims:
                YDim:MODIS_Grid_Daily_1km_LST21 1200
                XDim:MODIS_Grid_Daily_1km_LST21 1200
             DATA_Type: uint8
             DATA_DimensionSizes:[1200][1200]
             Compression:  Gzip
             Gzip_level: 4
             Chunk_sizes:    2  0
             long_name:  Time of LST observation
             units:  hrs
             scale_factor:    0.100000
             add_offset:    0.000000
             valid_range:    0  240
             _FillValue:    255

	Emis_29
             DATA_Rank: 2
             DATA_Dims:
                YDim:MODIS_Grid_Daily_1km_LST21 1200
                XDim:MODIS_Grid_Daily_1km_LST21 1200
             DATA_Type: uint8
             DATA_DimensionSizes:[1200][1200]
             Compression:  Gzip
             Gzip_level: 4
             Chunk_sizes:    2  0
             long_name:  Daily Band 29 emissivity
             units:  n/a
             scale_factor:    0.002000
             add_offset:    0.490000
             valid_range:    1  255
             _FillValue:    0

	Emis_31
             DATA_Rank: 2
             DATA_Dims:
                YDim:MODIS_Grid_Daily_1km_LST21 1200
                XDim:MODIS_Grid_Daily_1km_LST21 1200
             DATA_Type: uint8
             DATA_DimensionSizes:[1200][1200]
             Compression:  Gzip
             Gzip_level: 4
             Chunk_sizes:    2  0
             long_name:  Daily Band 31 emissivity
             units:  n/a
             scale_factor:    0.002000
             add_offset:    0.490000
             valid_range:    1  255
             _FillValue:    0

	Emis_32
             DATA_Rank: 2
             DATA_Dims:
                YDim:MODIS_Grid_Daily_1km_LST21 1200
                XDim:MODIS_Grid_Daily_1km_LST21 1200
             DATA_Type: uint8
             DATA_DimensionSizes:[1200][1200]
             Compression:  Gzip
             Gzip_level: 4
             Chunk_sizes:    2  0
             long_name:  Daily Band 32 emissivity
             units:  n/a
             scale_factor:    0.002000
             add_offset:    0.490000
             valid_range:    1  255
             _FillValue:    0

#######################################################

There are total 6 file attributes

HDFEOSVersion
StructMetadata.0
CoreMetadata.0
ArchiveMetadata.0
identifier_product_doi
identifier_product_doi_authority


HDFEOSVersion: HDFEOS_V2.19
StructMetadata.0: 
GROUP=SwathStructure
END_GROUP=SwathStructure
GROUP=GridStructure
	GROUP=GRID_1
		GridName="MODIS_Grid_Daily_1km_LST21"
		XDim=1200
		YDim=1200
		UpperLeftPointMtrs=("variable value","variable value")
		LowerRightMtrs=("variable value","variable value")
		Projection=GCTP_SNSOID
		ProjParams=(6371007.181000,0,0,0,0,0,0,0,0,0,0,0,0)
		SphereCode=-1
		GridOrigin=HDFE_GD_UL
		GROUP=Dimension
			OBJECT=Dimension_1
				DimensionName="Xdim"
				Size=1200
			END_OBJECT=Dimension_1
			OBJECT=Dimension_2
				DimensionName="Ydim"
				Size=1200
			END_OBJECT=Dimension_2
		END_GROUP=Dimension
		GROUP=DataField
			OBJECT=DataField_1
				DataFieldName="LST_1KM"
				DataType=DFNT_UINT16
				DimList=("YDim","XDim")
			END_OBJECT=DataField_1
			OBJECT=DataField_2
				DataFieldName="QC"
				DataType=DFNT_UINT16
				DimList=("YDim","XDim")
			END_OBJECT=DataField_2
			OBJECT=DataField_3
				DataFieldName="View_Angle"
				DataType=DFNT_UINT8
				DimList=("YDim","XDim")
			END_OBJECT=DataField_3
			OBJECT=DataField_4
				DataFieldName="View_Time"
				DataType=DFNT_UINT8
				DimList=("YDim","XDim")
			END_OBJECT=DataField_4
			OBJECT=DataField_5
				DataFieldName="Emis_29"
				DataType=DFNT_UINT8
				DimList=("YDim","XDim")
			END_OBJECT=DataField_5
			OBJECT=DataField_6
				DataFieldName="Emis_31"
				DataType=DFNT_UINT8
				DimList=("YDim","XDim")
			END_OBJECT=DataField_6
			OBJECT=DataField_7
				DataFieldName="Emis_32"
				DataType=DFNT_UINT8
				DimList=("YDim","XDim")
			END_OBJECT=DataField_7
		END_GROUP=DataField
		GROUP=MergedFields
		END_GROUP=MergedFields
	END_GROUP=GRID_1
END_GROUP=GridStructure
GROUP=PointStructure
END_GROUP=PointStructure
END

CoreMetadata.0: 
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  	GROUPTYPE: MASTERGROUP

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	  Name:									Num_Val:			Value:
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	  REPROCESSINGACTUAL							1				"variable value"
	  LOCALGRANULEID							1				"variable value"
	  DAYNIGHTFLAG								1				"Night"
	  PRODUCTIONDATETIME							1				"variable value"
	  LOCALVERSIONID							1				"6.0.3"

	GROUP:  MEASUREDPARAMETER
		MEASUREDPARAMETERCONTAINER
    		Name:								Num_Val:			Value:
		PARAMETERNAME							1				"MYD21A1"

	GROUP: QAFLAGS
		Name:								Num_Val:			Value:
		AUTOMATICQUALITYFLAG						1				"variable value"
		AUTOMATICQUALITYFLAGEXPLANATION					1				"No automatic quality assessment is performed in the PGE"
		SCIENCEQUALITYFLAG						1				"variable value"
		SCIENCEQUALITYFLAGEXPLANATION					1				"See http://landweb.nascom.nasa.gov/cgi-bin/QA_WWW/qaFlagPage.cgi?sat=terra&ver=C6 for the product Science Quality status."

	GROUP: QASTATS
		Name:								Num_Val:			Value:
		QAPERCENTINTERPOLATEDDATA					1				"variable value"
      		QAPERCENTMISSINGDATA						1				"variable value"
        	QAPERCENTOUTOFBOUNDSDATA					1				"variable value"
        	QAPERCENTCLOUDCOVER						1				"variable value"

	GROUP:  COLLECTIONDESCRIPTIONCLASS
		Name:								Num_Val:			Value:
		SHORTNAME							1				"MYD21A1N"
		VERSIONID							1				6

	GROUP: INPUTGRANULE
		Name:								Num_Val:			Value:
		INPUTPOINTER							2000				"variable value"
    
   	GROUP:  SPATIALDOMAINCONTAINER
	
	GROUP:	HORIZONTALSPATIALDOMAINCONTAINER
	
	GROUP:	GPOLYGON
		GPOLYGONCONTAINER
		GRING
		Name:								Num_Val:			Value:
		EXCLUSIONGRINGFLAG						1				"variable value"
  	
	GROUP:  GRINGPOINT
		Name:								Num_Val:			Value:
		GRINGPOINTLONGITUDE						4				"variable value"
        	GRINGPOINTLATITUDE						4				"variable value"
    		GRINGPOINTSEQUENCENO						4				"variable value"

	GROUP:  RANGEDATETIME
		Name:								Num_Val:			Value:
		RANGEBEGINNINGDATE						1				"variable value"
   		RANGEBEGINNINGTIME						1				"variable value"
    		RANGEENDINGDATE							1				"variable value"
		RANGEENDINGTIME							1				"variable value"

	GROUP:  PGEVERSIONCLASS
		Name:								Num_Val:			Value:
    		PGEVERSION							1				"6.0.14"

	GROUP:  SSOCIATEDPLATFORMINSTRUMENTSENSOR
		ASSOCIATEDPLATFORMINSTRUMENTSENSORCONTAINER
		Name:								Num_Val:			Value:
		ASSOCIATEDSENSORSHORTNAME					1				"MODIS"
		ASSOCIATEDPLATFORMSHORTNAME					1				"Aqua"
     		ASSOCIATEDINSTRUMENTSHORTNAME					1				"MODIS"

	GROUP:  ADDITIONALATTRIBUTES
		Name:								Num_Val:			Value:
		QAPERCENTGOODQUALITY 						1				"variable value"
		QAPERCENTOTHERQUALITY						1				"variable value"
		QAPERCENTNOTPRODUCEDCLOUD					1				"variable value"
		QAPERCENTNOTPRODUCEDOTHER					1				"variable value"
		HORIZONTALTILENUMBER						1				"variable value"
		VERTICALTILENUMBER 						1				"variable value"
		TileID								1				"variable value"
		PROCESSVERSION							1				"6.0.3"
		identifier_product_doi						1				"10.5067/MODIS/MYD21A1N.006"
		identifier_product_doi_authority				1				"http://dx.doi.org"


ArchiveMetadata.0: 
	GROUP:  ARCHIVEDMETADATA
  	GROUPTYPE:  MASTERGROUP

  	GROUP:  ALGORITHMPACKAGE
        	Name:								Num_Val:			Value:
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	GROUP:  PROJECT
        	Name:								Num_Val:			Value:
		LONGNAME							1				"MODIS/Aqua Land Surface Temperature/3-Band Emissivity Daily L3 Global 1km SIN Grid Night"
   		INSTRUMENTNAME							1				"Moderate-Resolution Imaging SpectroRadiometer"
    		PROCESSINGCENTER						1				"variable value"

	GROUP:  BOUNDINGRECTANGLE
       		Name:								Num_Val:			Value:
		NORTHBOUNDINGCOORDINATE						1				"variable value"
   		SOUTHBOUNDINGCOORDINATE						1				"variable value"
    		ASTBOUNDINGCOORDINATE						1				"variable value"
		WESTBOUNDINGCOORDINATE						1				"variable value"
		SPSOPARAMETERS							1				"variable value"
		PROCESSINGENVIRONMENT						1				"variable value"
		DESCRREVISION							1				"variable value"

Last updated: August 26, 2019