HDF-EOS V2 MODIS L2G Ocean Bands File Specification
Revision 1.0 (01/27/2015)
Product ID(s): MODIS Ocean Reflectance Bands L2G Daily 1km Day (MODOCGD)
Description:
The MODIS 1km Resolution Level 2G (L2G) Ocean band
file contains the restructured Level 2 (L2) Ocean bands data from bands 8-16
(observations), which intersects a geographic area, a tile, in the MODIS
global Level 3 (L3) grid. The global L3 grid is divided into a number of
tiles, areas with a nominal size of 1100 km by 1100 km (10 deg. by 10 deg.).
The data is stored at a nominal grid resolutions of 1km.
A single 1km observation consist of the 1km reflectance data from MODIS ocean bands 8-16
along with band specific quality flags and orbit and granule pointer fields.
For each pixel in the output tile, the 1km observation pointer is used to
find the location of the spatial element in each of the L2 product files
The value for each observation is extracted from the corresponding locations
in the L2 file. A one-to-one correspondence is kept between the
information in the observation pointer file and the surface reflectance file.
One additional data set is stored in the output file, the orbit and
coverage data set. The orbit number and scan half field are intended to be
used to allow a user to find the corresponding geolocation angle
information for a given observation. The observation coverage field gives
a coarse estimate of the area of intersection between the observation and
the cell (relative to the observation area). Both of these fields are
primarily meant to be used in the absence of the corresponding observation
pointer files.
There are two ways to which the observation data can be stored in a L2G
grid file, full and compact. The actual method is specified by the
L2GStorageFormat metadatum. In both methods, the first layer of
observations is stored in a 2 dimensional array. In the full method,
all of the values are stored in a 3 dimensional array with the slowest
varying dimension specifying the observation layer. This is an inefficient
storage method because typically a large number of cells are empty. For
the compact method, the additional observation values are stored in a single
dimensional array, with the dimension corresponding to the number of
additional observations since the beginning of the file. Essentially, the
additional observations are run-length encoded with each observation stored
sequentially for each cell. Only the full format is meant for distribution.
In addition, for initial production after launch, the user may specify that
only the first layer be stored, in which case the additional arrays are not
stored.
Points of Contact:
Robert Wolfe
NASA's Goddard Space Flight Center, Code 614.5
Greenbelt, MD 20771
(301) 614-5508
robert.e.wolfe@nasa.gov
Principal Investigator:
Eric Vermote
University of Maryland, College Park
NASA's Goddard Space Flight Center, Code 614.5
Greenbelt, MD 20771
(301) 405-8052
vermote@kratmos.gsfc.nasa.gov
===========================================================================
Generic Constructs
ECS Metadata Strings:
Notes: "FR" is an abbreviation for "FREE_RANGE".
"D/T" is an abbreviation for "DATE/TIME"
(A) implies that multiple values are stored within a
single array.
A value of "Variable" indicates that this value will vary
according to the granule being processed.
"M" means class M.
CoreMetadata.0
This string will contain the following PVL fields:
# of
Field Name Data Value Value
Type s
GROUP = INVENTORYMETADATA
GROUP = CollectionDescriptionClass
SHORTNAME STRING 1 "MODOCGD"
VERSIONID STRING 1 Variable
END_GROUP = CollectionDescriptionClass
GROUP = ECSDataGranule
REPROCESSINGPLANNED STRING 1 "further update
is anticipated"
REPROCESSINGACTUAL STRING 1 "reprocessed"
LOCALGRANULEID STRING 1 Variable
DAYNIGHTFLAG STRING 1 Variable
PRODUCTIONDATETIME D/T 1 Variable
LOCALVERSIONID STRING 1 Variable
SIZEMBECSDATAGRANULE DOUBLE 1 Variable
END_GROUP = ECSDataGranule
GROUP = PGEVersionClass
PGEVERSION STRING 1 Variable
END_GROUP = PGEVersionClass
GROUP = InputGranule
INPUTPOINTER STRING FR (A) Variable
END_GROUP = InputGranule
GROUP = RangeDateTime
RANGEBEGINNINGDATE DATE 1 Variable
RANGEBEGINNINGTIME TIME 1 Variable
RANGEENDINGDATE DATE 1 Variable
RANGEENDINGTIME TIME 1 Variable
END_GROUP = RangeDateTime
GROUP = GRing
EXCLUSIONGRINGFLAG STRING 1 "N"
END_GROUP = GRing
GROUP = GRingPoint
GRINGPOINTLATITUDE DOUBLE 4 (A) Variable
GRINGPOINTLONGITUDE DOUBLE 4 (A) Variable
GRINGPOINTSEQUENCENO INTEGER 4 (A) Variable
END_GROUP = GRingPoint
GROUP = ZoneIdentifierClass
ZONEIDENTIFIER STRING 1 "0"
END_GROUP = ZoneIdentifierClass
GROUP = OrbitCalculatedSpatialDomain
** number of containers is equal to "NumberofOrbits" **
ORBITNUMBER INTEGER 1 Variable
EQUATORCROSSINGLONGITUDE DOUBLE 1 Variable
EQUATORCROSSINGDATE DATE 1 Variable
EQUATORCROSSINGTIME TIME 1 Variable
END_GROUP = OrbitCalculatedSpatialDomain
GROUP = MeasuredParameter
PARAMETERNAME STRING FR (A) "MODOCGD"
GROUP = QAFLAGS
AUTOMATICQUALITYFLAG STRING 1 Variable
AUTOMATICQUALITYFLAGEXPLANATION
STRING 1 Variable
SCIENCEQUALITYFLAG STRING 1 Variable
SCIENCEQUALITYFLAGEXPLANATION
STRING 1 Variable
END_GROUP = QAFlags
GROUP = QAStats
QAPERCENTMISSINGDATA INTEGER 1 Variable
QAPERCENTOUTOFBOUNDSDATA INTEGER 1 Variable
QAPERCENTINTERPOLATEDDATA INTEGER 1 Variable
END_GROUP = QAStats
END_GROUP = MeasuredParameter
GROUP = AssociatedPlatformInstrumentSensor
ASSOCIATEDPLATFORMSHORTNAME STRING 1 "Terra/Aqua"
ASSOCIATEDINSTRUMENTSHORTNAME STRING 1 "MODIS"
ASSOCIATEDSENSORSHORTNAME STRING 1 "MODIS"
END_GROUP = AssociatedPlatformInstrumentSensor
GROUP = AdditionalAttributes
ADDITIONALATTRIBUTENAME STRING FR (A) Variable
PARAMETERVALUE STRING FR (A) Variable
ADDITIONALATTRIBUTENAME.1 = "QAPERCENTGOODQUALITY"
ADDITIONALATTRIBUTENAME.2 = "QAPERCENTOTHERQUALITY"
ADDITIONALATTRIBUTENAME.3 = "QAPERCENTNOTPRODUCEDCLOUD"
ADDITIONALATTRIBUTENAME.4 = "QAPERCENTNOTPRODUCEDOTHER"
ADDITIONALATTRIBUTENAME.5 = "HORIZONTALTILENUMBER"
ADDITIONALATTRIBUTENAME.6 = "VERTICALTILENUMBER"
ADDITIONALATTRIBUTENAME.7 = "TileID"
ADDITIONALATTRIBUTENAME.8 = "PROCESSVERSION"
ADDITIONALATTRIBUTENAME.9 = "identifier_product_doi"
ADDITIONALATTRIBUTENAME.10 = "identifier_product_doi_authority"
END_GROUP = AdditionalAttributes
END_GROUP = INVENTORYMETADATA
ArchiveMetadata.0
This string will contain the following PVL fields:
# of
Field Name Data Value Value
Type s
GROUP = ARCHIVEMETADATA
GROUP = BoundingRectangle
WESTBOUNDINGCOORDINATE DOUBLE 1 Variable
NORTHBOUNDINGCOORDINATE DOUBLE 1 Variable
EASTBOUNDINGCOORDINATE DOUBLE 1 Variable
SOUTHBOUNDINGCOORDINATE DOUBLE 1 Variable
END_GROUP = BoundingRectangle
GEOANYABNORMAL STRING 1 Variable
GEOESTMAXRMSERROR DOUBLE 1 Variable
LONGNAME STRING 1 "MODIS/Terra Ocean Surface Reflectance Daily L2G Global 1km SIN Grid"
SPSOPARAMETERS STRING 1 "2015"
PROCESSINGCENTER STRING 1 "MODAPS"
NUMBEROFOVERLAPGRANULES INTEGER 1 Variable
NUMBEROFINPUTGRANULES INTEGER 1 Variable
NUMBEROFGRANULES INTEGER 1 Variable
GRANULENUMBERARRAY INTEGER FR(A) Variable
GRANULEPOINTERARRAY INTEGER FR(A) Variable
ORBITNUMBERARRAY INTEGER FR(A) Variable
NUMBEROFORBITS INTEGER 1 Variable
GRANULEBEGINNINGDATETIME STRING "NumberofGranules"
Variable
GRANULEENDINGDATETIME STRING "NumberofGranules"
Variable
GRANULEDAYNIGHTFLAG STRING "NumberofGranules"
Variable
GRANULEDAYOFYEAR INTEGER "NumberofGranules"
Variable
GRANULEBEGINNINGDATETIMEARRAY STRING FR(A) Variable
GRANULEENDINGDATETIMEARRAY STRING FR(A) Variable
GRANULEDAYNIGHTFLAGARRAY STRING FR(A) Variable
NADIRDATARESOLUTION STRING 1 Variable
CHARACTERISTICBINANGULARSIZE DOUBLE 1 Variable
CHARACTERISTICBINSIZE DOUBLE 1 Variable
DATACOLUMNS INTEGER 1 Variable
DATAROWS INTEGER 1 Variable
GLOBALGRIDCOLUMNS INTEGER 1 Variable
GLOBALGRIDROWS INTEGER 1 Variable
MAXIMUMOBSERVATIONS INTEGER 1 Variable
ADDITIONALLAYERS INTEGER 1 Variable
TOTALOBSERVATIONS INTEGER 1 Variable
TOTALADDITIONALOBSERVATIONS INTEGER 1 Variable
COVERAGECALCULATIONMETHOD STRING 1 Variable
FIRSTLAYERSELECTIONCRITERIA STRING 1 Variable
L2GStorageFormat STRING 1 Variable
PROCESSINGENVIRONMENT STRING 1 Variable
DESCRREVISION STRING 1 Variable
SYSTEMFILENAME STRING FR (A) Variable
PERCENTPROCESSED INTEGER 1 Variable
PERCENTLAND INTEGER 1 Variable
PERCENTLANDSEAMASKCLASS INTEGER 8 Variable
PERCENTCLOUDY INTEGER 1 Variable
PERCENTSHADOW INTEGER 1 Variable
PERCENTLOWSUN INTEGER 1 Variable
RANKING STRING 1 Variable
KEEPALL STRING 1 Variable
COVERAGEMINIMUM DOUBLE 1 Variable
MAXOUTPUTRES STRING 1 Variable
DEEPOCEANFLAG STRING 1 Variable
CLOUDOPTION STRING 1 Variable
******************************************************************
* 1. The field "L2GStorageFormat"
* is either "full", "compact" or "one layer only".
* 2. The field "CoverageCalculationMethod" is either
* "area" or "volume".
* 3. The field "FirstLayerSelectionCriteria" is always set to
* "nearest neighbor" or "maximum observation coverage".
******************************************************************
END_GROUP = ARCHIVEMETADATA
StructuralMetadata.0
This string will be populated automatically by HDF-EOS.
Grid Structure: MOD_Grid_L2g_2d
Dimensions:
Dimension Name Value
YDim:MOD_Grid_L2g_2d "DataRows"
XDim:MOD_Grid_L2g_2d "DataColumns"
Corner Locations:
Corner Values
UpperLeftPointMtrs (Variable, Variable)
LowerRightPointMtrs (Variable, Variable)
Geographic Grid Projection Parameters:
Supported Grids: Integerized Sinusoidal (GCTP_ISINUS)
Sinusoidal (GCTP_SNSOID)
Interrupted Goodes Homolosine (GCTP_GOOD)
Lambert Azimuthal Equal Area (GCTP_LAMAZ)
Projection gridID = GCTP_ISINUS
ProjParam[0] 6371007.181
ProjParam[1 to 7] 0.0
ProjParam[8] 86400
ProjParam[9] 0.0
ProjParam[10] 1.0
ProjParam[11 to 12] 0.0
Spherecode -1
GridOrigin HDFE_GD_UL
Projection gridID = GCTP_SNSOID
ProjParam[0] 6371007.181
ProjParam[1 to 12] 0.0
Spherecode -1
GridOrigin HDFE_GD_UL
Projection gridID = GCTP_GOOD
ProjParam[0 to 12] 0.0
Spherecode 19
GridOrigin HDFE_GD_UL
Projection gridID = GCTP_LAMAZ
ProjParam[0] 6371228.0
ProjParam[1 to 5] 0.0
ProjParam[6] Variable
ProjParam[7 to 12] 0.0
Spherecode 19
GridOrigin HDFE_GD_UL
Grid Structure: MODIS_Grid_3D
Dimensions:
Dimension Name Value
Additional Layers:MODIS_Grid_3D "AdditionalLayers"
YDim:MODIS_Grid_3D "DataRows"
XDim:MODIS_Grid_3D "DataColumns"
Corner Locations: (same as MOD_Grid_L2g_2d)
Geographic Grid Projection Parameters: (same as MOD_Grid_L2g_2d)
===========================================================================
Additional global attributes:
Data
Name Type
identifier_product_doi STRING
identifier_product_doi_authority STRING
===========================================================================
DataFields:
The following datafields are always in this file:
num_observations
sur_refl_b08_1
sur_refl_b09_1
sur_refl_b10_1
sur_refl_b11_1
sur_refl_b12_1
sur_refl_b13_1
sur_refl_b14_1
sur_refl_b15_1
sur_refl_b16_1
QC_b8_15_1km_1
QC_b16_1km_1
orb_cov_1
If the "L2GStorageFormat" metadata value is "full", the following
datafields are also present:
sur_refl_b08_f
sur_refl_b09_f
sur_refl_b10_f
sur_refl_b11_f
sur_refl_b12_f
sur_refl_b13_f
sur_refl_b14_f
sur_refl_b15_f
sur_refl_b16_f
QC_b8_15_1km_f
QC_b16_1km_f
orb_cov_f
If the "L2GStorageFormat" metadata value is "compact", the following
datafields are also present:
sur_refl_b08_c
sur_refl_b09_c
sur_refl_b10_c
sur_refl_b11_c
sur_refl_b12_c
sur_refl_b13_c
sur_refl_b14_c
sur_refl_b15_c
sur_refl_b16_c
QC_b8_15_1km_c
QC_b16_1km_c
orb_cov_c
nadd_obs_row
Each datafield has at least the following 4 attributes:
long_name (STRING)
units (STRING)
valid_range (agrees with data type of SDS)
_FillValue (agrees with data type of SDS)
Some datafields also contain the following 5 attributes:
add_offset (float64)
add_offset_err (float64)
calibrated_nt (int32)
scale_factor (float64)
scale_factor_err (float64)
Nadir Data Resolution (STRING - "1km")
QA index (STRING)
===========================================================================
Name Data Dimensions
Type
num_observations INT8 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
Description:
The number of 1km observations per pixel contained within
this L2G file. In addition, if the value is less than zero,
it means that intersections were not computed for this cell.
If it is -1, it is part of the fill region of the grid. If it
is -2, it is in the area identified as 'non-production' in the
Land Production Mask.
HDF Attributes:
Number of
Values or
Max.
Attribute Data String Value
Type Length
long_name STRING 22 "Number of observations"
units STRING 4 "none"
valid_range INT8 2 0, 127
_FillValue INT8 1 -1
===========================================================================
Name Data Dimensions
Type
sur_refl_b08_1 INT16 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
sur_refl_b08_f INT16 "Additional Layers:MODIS_Grid_3D",
"YDim:MOD_Grid_L2g_3D",
"XDim:MOD_Grid_L2g_3D"
sur_refl_b08_c INT16 "TotalAdditionalObservations"
metadata value
Description:
1km MODIS Band 8 Surface Reflectance
"sur_refl_b08_1" is for storing the first layer of observations
and is always stored.
"sur_refl_b08_f" and "sur_refl_b08_c" are for storing the
additional layers of observations. "sur_refl_b08_f" is for the
full format and is stored only if "L2GStorageFormat" is "full".
"sur_refl_b08_c" is for the compact format and is stored only if
"L2GStorageFormat" is "compact".
Number of
Values or
Max.
Attribute Data String Value
Type Length
long_name STRING 44 Variable
units STRING 11 "reflectance"
valid_range INT16 2 -100, 16000
_FillValue INT16 1 -28672
add_offset FLOAT64 1 0.0
add_offset_err FLOAT64 1 0.0
calibrated_nt INT32 1 5
scale_factor FLOAT64 1 10000.0
scale_factor_err FLOAT64 1 0.0
Nadir Data Resolution
STRING 3 "1km"
Note: The attribute "long_name" is
"1km Surface Reflectance Band 8 - first layer" for "sur_refl_b08_1",
"1km Surface Reflectance Band 8 - additional layers, full"
for "sur_refl_b08_f", or
"1km Surface Reflectance Band 8 - additional layers, compact"
for "sur_refl_b08_c".
===========================================================================
Name Data Dimensions
Type
sur_refl_b09_1 INT16 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
sur_refl_b09_f INT16 "Additional Layers:MODIS_Grid_3D",
"YDim:MOD_Grid_L2g_3D",
"XDim:MOD_Grid_L2g_3D"
sur_refl_b09_c INT16 "TotalAdditionalObservations"
metadata value
Description:
1km MODIS Band 9 Surface Reflectance
"sur_refl_b09_1" is for storing the first layer of observations
and is always stored.
"sur_refl_b09_f" and "sur_refl_b09_c" are for storing the
additional layers of observations. "sur_refl_b09_f" is for the
full format and is stored only if "L2GStorageFormat" is "full".
"sur_refl_b09_c" is for the compact format and is stored only if
"L2GStorageFormat" is "compact".
Number of
Values or
Max.
Attribute Data String Value
Type Length
long_name STRING 44 Variable
units STRING 11 "reflectance"
valid_range INT16 2 -100, 16000
_FillValue INT16 1 -28672
add_offset FLOAT64 1 0.0
add_offset_err FLOAT64 1 0.0
calibrated_nt INT32 1 5
scale_factor FLOAT64 1 10000.0
scale_factor_err FLOAT64 1 0.0
Nadir Data Resolution
STRING 3 "1km"
Note: The attribute "long_name" is
"1km Surface Reflectance Band 9 - first layer" for "sur_refl_b09_1",
"1km Surface Reflectance Band 9 - additional layers, full"
for "sur_refl_b09_f", or
"1km Surface Reflectance Band 9 - additional layers, compact"
for "sur_refl_b09_c".
===========================================================================
Name Data Dimensions
Type
sur_refl_b10_1 INT16 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
sur_refl_b10_f INT16 "Additional Layers:MODIS_Grid_3D",
"YDim:MOD_Grid_L2g_3D",
"XDim:MOD_Grid_L2g_3D"
sur_refl_b10_c INT16 "TotalAdditionalObservations"
metadata value
Description:
1km MODIS Band 10 Surface Reflectance
"sur_refl_b10_1" is for storing the first layer of observations
and is always stored.
"sur_refl_b10_f" and "sur_refl_b10_c" are for storing the
additional layers of observations. "sur_refl_b10_f" is for the
full format and is stored only if "L2GStorageFormat" is "full".
"sur_refl_b10_c" is for the compact format and is stored only if
"L2GStorageFormat" is "compact".
Number of
Values or
Max.
Attribute Data String Value
Type Length
long_name STRING 44 Variable
units STRING 11 "reflectance"
valid_range INT16 2 -100, 16000
_FillValue INT16 1 -28672
add_offset FLOAT64 1 0.0
add_offset_err FLOAT64 1 0.0
calibrated_nt INT32 1 5
scale_factor FLOAT64 1 10000.0
scale_factor_err FLOAT64 1 0.0
Nadir Data Resolution
STRING 3 "1km"
Note: The attribute "long_name" is
"1km Surface Reflectance Band 10 - first layer" for "sur_refl_b10_1",
"1km Surface Reflectance Band 10 - additional layers, full"
for "sur_refl_b10_f", or
"1km Surface Reflectance Band 10 - additional layers, compact"
for "sur_refl_b10_c".
===========================================================================
Name Data Dimensions
Type
sur_refl_b11_1 INT16 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
sur_refl_b11_f INT16 "Additional Layers:MODIS_Grid_3D",
"YDim:MOD_Grid_L2g_3D",
"XDim:MOD_Grid_L2g_3D"
sur_refl_b11_c INT16 "TotalAdditionalObservations"
metadata value
Description:
1km MODIS Band 11 Surface Reflectance
"sur_refl_b11_1" is for storing the first layer of observations
and is always stored.
"sur_refl_b11_f" and "sur_refl_b11_c" are for storing the
additional layers of observations. "sur_refl_b11_f" is for the
full format and is stored only if "L2GStorageFormat" is "full".
"sur_refl_b11_c" is for the compact format and is stored only if
"L2GStorageFormat" is "compact".
Number of
Values or
Max.
Attribute Data String Value
Type Length
long_name STRING 44 Variable
units STRING 11 "reflectance"
valid_range INT16 2 -100, 16000
_FillValue INT16 1 -28672
add_offset FLOAT64 1 0.0
add_offset_err FLOAT64 1 0.0
calibrated_nt INT32 1 5
scale_factor FLOAT64 1 10000.0
scale_factor_err FLOAT64 1 0.0
Nadir Data Resolution
STRING 3 "1km"
Note: The attribute "long_name" is
"1km Surface Reflectance Band 11 - first layer" for "sur_refl_b11_1",
"1km Surface Reflectance Band 11 - additional layers, full"
for "sur_refl_b11_f", or
"1km Surface Reflectance Band 11 - additional layers, compact"
for "sur_refl_b11_c".
===========================================================================
Name Data Dimensions
Type
sur_refl_b12_1 INT16 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
sur_refl_b12_f INT16 "Additional Layers:MODIS_Grid_3D",
"YDim:MOD_Grid_L2g_3D",
"XDim:MOD_Grid_L2g_3D"
sur_refl_b12_c INT16 "TotalAdditionalObservations"
metadata value
Description:
1km MODIS Band 12 Surface Reflectance
"sur_refl_b12_1" is for storing the first layer of observations
and is always stored.
"sur_refl_b12_f" and "sur_refl_b12_c" are for storing the
additional layers of observations. "sur_refl_b12_f" is for the
full format and is stored only if "L2GStorageFormat" is "full".
"sur_refl_b12_c" is for the compact format and is stored only if
"L2GStorageFormat" is "compact".
Number of
Values or
Max.
Attribute Data String Value
Type Length
long_name STRING 44 Variable
units STRING 11 "reflectance"
valid_range INT16 2 -100, 16000
_FillValue INT16 1 -28672
add_offset FLOAT64 1 0.0
add_offset_err FLOAT64 1 0.0
calibrated_nt INT32 1 5
scale_factor FLOAT64 1 10000.0
scale_factor_err FLOAT64 1 0.0
Nadir Data Resolution
STRING 3 "1km"
Note: The attribute "long_name" is
"1km Surface Reflectance Band 12 - first layer" for "sur_refl_b12_1",
"1km Surface Reflectance Band 12 - additional layers, full"
for "sur_refl_b12_f", or
"1km Surface Reflectance Band 12 - additional layers, compact"
for "sur_refl_b12_c".
===========================================================================
Name Data Dimensions
Type
sur_refl_b13_1 INT16 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
sur_refl_b13_f INT16 "Additional Layers:MODIS_Grid_3D",
"YDim:MOD_Grid_L2g_3D",
"XDim:MOD_Grid_L2g_3D"
sur_refl_b13_c INT16 "TotalAdditionalObservations"
metadata value
Description:
1km MODIS Band 13 Surface Reflectance
"sur_refl_b13_1" is for storing the first layer of observations
and is always stored.
"sur_refl_b13_f" and "sur_refl_b13_c" are for storing the
additional layers of observations. "sur_refl_b13_f" is for the
full format and is stored only if "L2GStorageFormat" is "full".
"sur_refl_b13_c" is for the compact format and is stored only if
"L2GStorageFormat" is "compact".
Number of
Values or
Max.
Attribute Data String Value
Type Length
long_name STRING 44 Variable
units STRING 11 "reflectance"
valid_range INT16 2 -100, 16000
_FillValue INT16 1 -28672
add_offset FLOAT64 1 0.0
add_offset_err FLOAT64 1 0.0
calibrated_nt INT32 1 5
scale_factor FLOAT64 1 10000.0
scale_factor_err FLOAT64 1 0.0
Nadir Data Resolution
STRING 3 "1km"
Note: The attribute "long_name" is
"1km Surface Reflectance Band 13 - first layer" for "sur_refl_b13_1",
"1km Surface Reflectance Band 13 - additional layers, full"
for "sur_refl_b13_f", or
"1km Surface Reflectance Band 13 - additional layers, compact"
for "sur_refl_b13_c".
===========================================================================
Name Data Dimensions
Type
sur_refl_b14_1 INT16 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
sur_refl_b14_f INT16 "Additional Layers:MODIS_Grid_3D",
"YDim:MOD_Grid_L2g_3D",
"XDim:MOD_Grid_L2g_3D"
sur_refl_b14_c INT16 "TotalAdditionalObservations"
metadata value
Description:
1km MODIS Band 14 Surface Reflectance
"sur_refl_b14_1" is for storing the first layer of observations
and is always stored.
"sur_refl_b14_f" and "sur_refl_b14_c" are for storing the
additional layers of observations. "sur_refl_b14_f" is for the
full format and is stored only if "L2GStorageFormat" is "full".
"sur_refl_b14_c" is for the compact format and is stored only if
"L2GStorageFormat" is "compact".
Number of
Values or
Max.
Attribute Data String Value
Type Length
long_name STRING 44 Variable
units STRING 11 "reflectance"
valid_range INT16 2 -100, 16000
_FillValue INT16 1 -28672
add_offset FLOAT64 1 0.0
add_offset_err FLOAT64 1 0.0
calibrated_nt INT32 1 5
scale_factor FLOAT64 1 10000.0
scale_factor_err FLOAT64 1 0.0
Nadir Data Resolution
STRING 3 "1km"
Note: The attribute "long_name" is
"1km Surface Reflectance Band 14 - first layer" for "sur_refl_b14_1",
"1km Surface Reflectance Band 14 - additional layers, full"
for "sur_refl_b14_f", or
"1km Surface Reflectance Band 14 - additional layers, compact"
for "sur_refl_b14_c".
===========================================================================
Name Data Dimensions
Type
sur_refl_b15_1 INT16 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
sur_refl_b15_f INT16 "Additional Layers:MODIS_Grid_3D",
"YDim:MOD_Grid_L2g_3D",
"XDim:MOD_Grid_L2g_3D"
sur_refl_b15_c INT16 "TotalAdditionalObservations"
metadata value
Description:
1km MODIS Band 15 Surface Reflectance
"sur_refl_b15_1" is for storing the first layer of observations
and is always stored.
"sur_refl_b15_f" and "sur_refl_b15_c" are for storing the
additional layers of observations. "sur_refl_b15_f" is for the
full format and is stored only if "L2GStorageFormat" is "full".
"sur_refl_b15_c" is for the compact format and is stored only if
"L2GStorageFormat" is "compact".
Number of
Values or
Max.
Attribute Data String Value
Type Length
long_name STRING 44 Variable
units STRING 11 "reflectance"
valid_range INT16 2 -100, 16000
_FillValue INT16 1 -28672
add_offset FLOAT64 1 0.0
add_offset_err FLOAT64 1 0.0
calibrated_nt INT32 1 5
scale_factor FLOAT64 1 10000.0
scale_factor_err FLOAT64 1 0.0
Nadir Data Resolution
STRING 3 "1km"
Note: The attribute "long_name" is
"1km Surface Reflectance Band 15 - first layer" for "sur_refl_b15_1",
"1km Surface Reflectance Band 15 - additional layers, full"
for "sur_refl_b15_f", or
"1km Surface Reflectance Band 15 - additional layers, compact"
for "sur_refl_b15_c".
===========================================================================
Name Data Dimensions
Type
sur_refl_b16_1 INT16 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
sur_refl_b16_f INT16 "Additional Layers:MODIS_Grid_3D",
"YDim:MOD_Grid_L2g_3D",
"XDim:MOD_Grid_L2g_3D"
sur_refl_b16_c INT16 "TotalAdditionalObservations"
metadata value
Description:
1km MODIS Band 16 Surface Reflectance
"sur_refl_b16_1" is for storing the first layer of observations
and is always stored.
"sur_refl_b16_f" and "sur_refl_b16_c" are for storing the
additional layers of observations. "sur_refl_b16_f" is for the
full format and is stored only if "L2GStorageFormat" is "full".
"sur_refl_b16_c" is for the compact format and is stored only if
"L2GStorageFormat" is "compact".
Number of
Values or
Max.
Attribute Data String Value
Type Length
long_name STRING 44 Variable
units STRING 11 "reflectance"
valid_range INT16 2 -100, 16000
_FillValue INT16 1 -28672
add_offset FLOAT64 1 0.0
add_offset_err FLOAT64 1 0.0
calibrated_nt INT32 1 5
scale_factor FLOAT64 1 10000.0
scale_factor_err FLOAT64 1 0.0
Nadir Data Resolution
STRING 3 "1km"
Note: The attribute "long_name" is
"1km Surface Reflectance Band 16 - first layer" for "sur_refl_b16_1",
"1km Surface Reflectance Band 16 - additional layers, full"
for "sur_refl_b16_f", or
"1km Surface Reflectance Band 16 - additional layers, compact"
for "sur_refl_b16_c".
===========================================================================
Name Data Dimensions
Type
QC_b8_15_1km_1 UINT32 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
QC_b8_15_1km_f UINT32 "Additional Layers:MODIS_Grid_3D",
"YDim:MOD_Grid_3D",
"XDim:MOD_Grid_3D"
QC_b8_15_1km_c UINT32 "TotalAdditionalObservations1km"
metadata value
Description:
1km bands 8-15 Reflectance Band Quality
"QC_b8_15_1km_1" is for storing the first layer of observations
and is always stored.
"QC_b8_15_1km_f" and "QC_b8_15_1km_c" are for storing the
additional layers of observations. "QC_b8_15_1km_f" is for the
full format and is stored only if "L2GStorageFormat1km" is "full".
"QC_b8_15_1km_c" is for the compact format and is stored only if
"L2GStorageFormat1km" is "compact".
Note: Bits are listed from the MSB (bit 31) to the LSB (bit 0).
Bit(s) Description
28-31 band 15 data quality four bit range;
0000 -- highest quality
0111 -- noisy detector
1000 -- dead detector; data interpolated in L1B
1001 -- solar zenith >= 86 degrees
1010 -- solar zenith >= 85 and < 86 degrees
1011 -- missing input
1100 -- internal constant used in place of climatological data
for at least one atmospheric constant
1101 -- correction out of bounds pixel constrained to extreme
allowable value
1110 -- L1B data faulty
1111 -- not processed due to deep ocean or clouds
24-27 band 14 data quality four bit range;
SAME AS ABOVE
20-23 band 13 data quality four bit range;
SAME AS ABOVE
16-19 band 12 data quality four bit range;
SAME AS ABOVE
12-15 band 11 data quality four bit range;
SAME AS ABOVE
8-11 band 10 data quality four bit range;
SAME AS ABOVE
4-7 band 9 data quality four bit range;
SAME AS ABOVE
0-3 band 8 data quality four bit range;
SAME AS ABOVE
Number of
Values or
Max.
Attribute Data String Value
Type Length
long_name STRING 48 Variable
units STRING 9 "bit field"
valid_range UINT16 2 0, 4294966019
_FillValue UINT16 1 787410671
Nadir Data Resolution
STRING 3 "1km"
QA index STRING 1156 Variable
Note: The attribute "long_name" is
"1km b8-15 Reflectance Band Quality - first layer" for "QC_b8_15_1km_1",
"1km b8-15 Reflectance Band Quality - additional layers, full"
for "QC_b8_15_1km_f", or
"1km b8-15 Reflectance Band Quality - additional layers, compact"
for "QC_b8_15_1km_c".
===========================================================================
Name Data Dimensions
Type
QC_b16_1km_1 UINT8 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
QC_b16_1km_f UINT8 "Additional Layers:MODIS_Grid_3D",
"YDim:MOD_Grid_3D",
"XDim:MOD_Grid_3D"
QC_b16_1km_c UINT8 "TotalAdditionalObservations1km"
metadata value
Description:
1km band 16 Reflectance Band Quality
"QC_b16_1km_1" is for storing the first layer of observations
and is always stored.
"QC_b16_1km_f" and "QC_b16_1km_c" are for storing the
additional layers of observations. "QC_b16_1km_f" is for the
full format and is stored only if "L2GStorageFormat1km" is "full".
"QC_b16_1km_c" is for the compact format and is stored only if
"L2GStorageFormat1km" is "compact".
Note: Bits are listed from the MSB (bit 31) to the LSB (bit 0).
Bit(s) Description
4-7 band 16 data quality four bit range;
0000 -- highest quality
0111 -- noisy detector
1000 -- dead detector; data interpolated in L1B
1001 -- solar zenith >= 86 degrees
1010 -- solar zenith >= 85 and < 86 degrees
1011 -- missing input
1100 -- internal constant used in place of climatological data
for at least one atmospheric constant
1101 -- correction out of bounds pixel constrained to extreme
allowable value
1110 -- L1B data faulty
1111 -- not processed due to deep ocean or clouds
0-3 spare (unused);
Number of
Values or
Max.
Attribute Data String Value
Type Length
long_name STRING 46 Variable
units STRING 9 "bit field"
valid_range UINT16 2 0, 255
_FillValue UINT16 1 3
Nadir Data Resolution
STRING 3 "1km"
QA index STRING 1156 Variable
Note: The attribute "long_name" is
"1km b16 Reflectance Band Quality - first layer" for "QC_b16_1km_1",
"1km b16 Reflectance Band Quality - additional layers, full"
for "QC_b16_1km_f", or
"1km b16 Reflectance Band Quality - additional layers, compact"
for "QC_b16_1km_c".
===========================================================================
Name Data Dimensions
Type
orb_cov_1 UINT8 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
orb_cov_f UINT8 "Additional Layers:MODIS_Grid_3D",
"YDim:MODIS_Grid_3D",
"XDim:MODIS_Grid_3D"
orb_cov_c UINT8 "TotalAdditionalObservations"
metadata value
Description:
Orbit and coverage: the orbit the observation came from and
the observation coverage. The orbit number is not the absolute
orbit number but a relative orbit number in the file. In
addition a flag is stored which distinguishes between
observations which are in the top half of the scan (the first
5 1km scan lines in the along track direction) and the bottom
half of the scan (the last 5 1km scan lines). The observation
coverage is the area of intersection of observation footprint
and cell divided by the area of the observation.
Bit Description
0-3 Orbit number: 4 bit unsigned integer; range 0 to 13
key: 0000 ( 0) to 1011 (13)
4 Scan half flag; which half of the scan the observation
came from:
key: 0 - top half
1 - bottom half
5-7 Observation coverage: 3 bit unsigned integer;
range 0 to 7
key: 000 (0) - 0.0 to 12.5%
001 (1) - 12.5 to 25.0%
010 (2) - 25.0 to 37.5%
011 (3) - 37.5 to 50.0%
100 (4) - 50.0 to 62.5%
101 (5) - 62.5 to 75.0%
110 (6) - 75.0 to 87.5%
111 (7) - 87.5 to 100.0%
"orb_cov_1" is for storing the first layer of observations
and is always stored.
"orb_cov_f" and "orb_cov_c" are for storing the
additional layers of observations. "orb_cov_f" is for the
full format and is stored only if the metadatum
"L2GStorageFormat" is "full". "orb_cov_c" is for the
compact format and is stored only if the metadatum
"L2GStorageFormat" is "compact".
HDF Attributes:
Number of
Values or
Max.
Attribute Data String Value
Type Length
long_name STRING 49 Variable
units STRING 9 "bit field"
valid_range INT8 2 0, 255
_FillValue INT8 1 15
Note: The attribute "long_name" is
"Orbit pointer - first layer" for "orb_cov_1",
"Orbit pointer - additional layers, full" for "orb_cov_f", or
"Orbit pointer - additional layers, compact" for "orb_cov_c".
===========================================================================
Name Data Dimensions
Type
nadd_obs_row INT32 "DataRows" metadata value
Description:
The number of additional observations in each row in the
compact storage form of the L2G grid.
This field is only stored if "L2GStorageFormat" is "compact".
HDF Attributes:
Number of
Values or
Max.
Attribute Data String Value
Type Length
long_name STRING 41 "Number of additional observations
per row"
units STRING 4 "none"
valid_range INT32 2 0, INT32_MAX
_FillValue INT32 1 -1
===========================================================================