MODIS Land Surface Temperature/Emissivity Daily L3 Global 1km (MOD21A2)
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)
glynn.hulley@jpl.nasa.gov
Principal Investigator(s):
Glynn C. Hulley (PI)
MS 183-509
Jet Propulsion Laboratory
4800 Oak Grove Dr.
Pasadena, CA 91109
Email: glynn.hulley@jpl.nasa.gov
Office: (818) 354-2979
============================================================================
General Construct
There are total 7 scientific data fields.
LST_1KM
QC
View_Angle
View_Time
Emis_29
Emis_31
Emis_32
#######################################################
LST_Day_1KM
DATA_Rank: 2
DATA_Dims:
YDim:MODIS_Grid_8Day_1km_LST21 1200
XDim:MODIS_Grid_8Day_1km_LST21 1200
DATA_Type: uint16
DATA_DimensionSizes:[1200][1200]
Compression: Gzip
Gzip_level: 4
Chunk_sizes: 2 0
long_name: 8-day daytime 1km grid Land-surface Temperature
units: K
scale_factor: 0.020000
add_offset: 0.000000
valid_range: 7500 65535
_FillValue: 0
QC_Day
DATA_Rank: 2
DATA_Dims:
YDim:MODIS_Grid_8Day_1km_LST21 1200
XDim:MODIS_Grid_8Day_1km_LST21 1200
DATA_Type: uint8
DATA_DimensionSizes:[1200][1200]
Compression: Gzip
Gzip_level: 4
Chunk_sizes: 2 0
long_name: Quality control for daytime LST and emissivity
units: n/a
scale_factor: n/a
add_offset: n/a
valid_range: 0 255
_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]: 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)
[6 - 7]: LST accuracy
00: >2K (Poor performance)
01: 1.5 - 2K (Marginal performance)
10: 1 - 1.5K (Good performance)
11: < 1K (Excellent performance)
View_Angle_Day
DATA_Rank: 2
DATA_Dims:
YDim:MODIS_Grid_8Day_1km_LST21 1200
XDim:MODIS_Grid_8Day_1km_LST21 1200
DATA_Type: uint8
DATA_DimensionSizes:[1200][1200]
Compression: Gzip
Gzip_level: 4
Chunk_sizes: 2 0
long_name: Average view zenith angle of daytime Land-surface Temperature
units: deg
scale_factor: 1.000000
add_offset: -65.000000
valid_range: 0 130
_FillValue: 255
View_Time_Day
DATA_Rank: 2
DATA_Dims:
YDim:MODIS_Grid_8Day_1km_LST21 1200
XDim:MODIS_Grid_8Day_1km_LST21 1200
DATA_Type: uint8
DATA_DimensionSizes:[1200][1200]
Compression: Gzip
Gzip_level: 4
Chunk_sizes: 2 0
long_name: Average time of daytime Land-surface Temperature observation
units: hrs
scale_factor: 0.100000
add_offset: 0.000000
valid_range: 0 240
_FillValue: 255
LST_Night_1KM
DATA_Rank: 2
DATA_Dims:
YDim:MODIS_Grid_8Day_1km_LST21 1200
XDim:MODIS_Grid_8Day_1km_LST21 1200
DATA_Type: uint16
DATA_DimensionSizes:[1200][1200]
Compression: Gzip
Gzip_level: 4
Chunk_sizes: 2 0
long_name: 8-day nighttime 1km grid Land-surface Temperature
units: K
scale_factor: 0.020000
add_offset: 0.000000
valid_range: 7500 65535
_FillValue: 0
QC_Night
DATA_Rank: 2
DATA_Dims:
YDim:MODIS_Grid_8Day_1km_LST21 1200
XDim:MODIS_Grid_8Day_1km_LST21 1200
DATA_Type: uint8
DATA_DimensionSizes:[1200][1200]
Compression: Gzip
Gzip_level: 4
Chunk_sizes: 2 0
long_name: Quality control for nighttime LST and emissivity
units: n/a
scale_factor: n/a
add_offset: n/a
valid_range: 0 255
_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]: 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)
[6 - 7]: LST accuracy
00: >2K (Poor performance)
01: 1.5 - 2K (Marginal performance)
10: 1 - 1.5K (Good performance)
11: < 1K (Excellent performance)
View_Angle_Night
DATA_Rank: 2
DATA_Dims:
YDim:MODIS_Grid_8Day_1km_LST21 1200
XDim:MODIS_Grid_8Day_1km_LST21 1200
DATA_Type: uint8
DATA_DimensionSizes:[1200][1200]
Compression: Gzip
Gzip_level: 4
Chunk_sizes: 2 0
long_name: Average view zenith angle of nighttime Land-surface Temperature
units: deg
scale_factor: 1.000000
add_offset: -65.000000
valid_range: 0 130
_FillValue: 255
View_Time_Night
DATA_Rank: 2
DATA_Dims:
YDim:MODIS_Grid_8Day_1km_LST21 1200
XDim:MODIS_Grid_8Day_1km_LST21 1200
DATA_Type: uint8
DATA_DimensionSizes:[1200][1200]
Compression: Gzip
Gzip_level: 4
Chunk_sizes: 2 0
long_name: Average time of nighttime Land-surface Temperature 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_8Day_1km_LST21 1200
XDim:MODIS_Grid_8Day_1km_LST21 1200
DATA_Type: uint8
DATA_DimensionSizes:[1200][1200]
Compression: Gzip
Gzip_level: 4
Chunk_sizes: 2 0
long_name: Average 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_8Day_1km_LST21 1200
XDim:MODIS_Grid_8Day_1km_LST21 1200
DATA_Type: uint8
DATA_DimensionSizes:[1200][1200]
Compression: Gzip
Gzip_level: 4
Chunk_sizes: 2 0
long_name: Average 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_8Day_1km_LST21 1200
XDim:MODIS_Grid_8Day_1km_LST21 1200
DATA_Type: uint8
DATA_DimensionSizes:[1200][1200]
Compression: Gzip
Gzip_level: 4
Chunk_sizes: 2 0
long_name: Average 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_8Day_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
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END_OBJECT=Dimension_1
OBJECT=Dimension_2
DimensionName="Ydim"
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END_GROUP=Dimension
GROUP=DataField
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DataType=DFNT_UINT16
DimList=("YDim","XDim")
END_OBJECT=DataField_1
OBJECT=DataField_2
DataFieldName="QC_Day"
DataType=DFNT_UINT8
DimList=("YDim","XDim")
END_OBJECT=DataField_2
OBJECT=DataField_3
DataFieldName="View_Angle_Day"
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DimList=("YDim","XDim")
END_OBJECT=DataField_3
OBJECT=DataField_4
DataFieldName="View_Time_Day"
DataType=DFNT_UINT8
DimList=("YDim","XDim")
END_OBJECT=DataField_4
OBJECT=DataField_5
DataFieldName="LST_Night_1KM"
DataType=DFNT_UINT16
DimList=("YDim","XDim")
END_OBJECT=DataField_5
OBJECT=DataField_6
DataFieldName="QC_Night"
DataType=DFNT_UINT8
DimList=("YDim","XDim")
END_OBJECT=DataField_6
OBJECT=DataField_7
DataFieldName="View_Angle_Night"
DataType=DFNT_UINT8
DimList=("YDim","XDim")
END_OBJECT=DataField_7
OBJECT=DataField_8
DataFieldName="View_Time_Night"
DataType=DFNT_UINT8
DimList=("YDim","XDim")
END_OBJECT=DataField_8
OBJECT=DataField_9
DataFieldName="Emis_29"
DataType=DFNT_UINT8
DimList=("YDim","XDim")
END_OBJECT=DataField_9
OBJECT=DataField_10
DataFieldName="Emis_31"
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DimList=("YDim","XDim")
END_OBJECT=DataField_10
OBJECT=DataField_11
DataFieldName="Emis_32"
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END_OBJECT=DataField_11
END_GROUP=DataField
GROUP=MergedFields
END_GROUP=MergedFields
END_GROUP=GRID_1
END_GROUP=GridStructure
GROUP=PointStructure
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END
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GROUP: MEASUREDPARAMETER
MEASUREDPARAMETERCONTAINER
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GROUP: GRINGPOINT
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