HDF-EOS V2 L2G Thermal Anomaly/Fire Products File Specification
Revision 2.4 (Apr 10, 98 )
Revision 2.5 (11/26/1999)
Revision 3.0 (11/26/2000)
Product ID(s): MOD14 L2G 1DY 1KM DAY & NIGHT (MOD14GD & MOD14GN)
Description:
The Level 2G (L2G) Thermal Anomaly/Fire Products file contains the
contains the restructured Level 2 (L2) fire and thermal anomaly parameter
which intersects a geographic area, a tile in the Level 3 (L3) grid. The actual
data stored is based on a set of pointers to observations which intersect
each cell (pixel) in the corresponding L2G 1KM Observation Pointer file. A
single 1KM Land Surface Reflectance Data state observation consist of
fire mask, algorithm_QA, power, temperatures, and their mean and
standard deviation. Nominally, a entire data-day's (24 hours GMT) worth
of data, which intersects the tile, is stored in the file.
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 thermal anomaly/fire
data is stored at a nominal grid resolution of 1km.
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 thermal anomaly/fire
files. The thermal anomaly/fire information for each observation is
extracted from the corresponding locations in the input files. A one-to-one
correspondence is kept between the information in the observation pointer
file and the thermal anomaly/fire file.
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.
Point of Contact:
Louis Giglio
Science Systems and Applications Inc.
NASA Goddard Space Flight Center, Code 923
Greenbelt, MD 20771
(301) 286-2091
giglio@hades.gsfc.nasa.gov
Paul Fisher
Science Systems and Applications Inc.
NASA Goddard Space Flight Center, Code 923
Greenbelt, MD 20771
(301) 286-2980
fisher@ltpmail.gsfc.nasa.gov
Kai Yang
Science Systems and Applications Inc.
NASA Goddard Space Flight Center, Code 922
Greenbelt, MD 20771
(301) 614-5452
kyang@ltpmail.gsfc.nasa.gov
Robert Wolfe
Hughes STX
NASA's Goddard Space Flight Center, Code 922
Greenbelt, MD 20771
(301) 614-5508
robert.wolfe@gsfc.nasa.gov
Principal Investigator: Chris Justice
University of Virgina
NASA Goddard Space Flight Center, Code 923
Greenbelt, MD 20771
(301) 286-7372
justice@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 "MOD14GN"
VERSIONID STRING 1 Variable
END_GROUP = CollectionDescriptionClass
GROUP = ECSDataGranule
REPROCESSINGPLANNED STRING 1 "no further update
anticipated"
REPROCESSINGACTUAL STRING 1 "processed once"
LOCALGRANULEID STRING 1 Variable
DAYNIGHTFLAG STRING 1 Variable
PRODUCTIONDATETIME D/T 1 Variable
LOCALVERSIONID STRING 1 Variable
SIZEMBECSDATAGRANULE FLOAT 1 Variable
END_GROUP = ECSDataGranule
GROUP = PGEVersionClass
PGEVERSION STRING 1 "2.1"
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 = OrbitCalculatedSpatialDomain
ORBITNUMBER INTEGER "NumberofGranules"
Variable
EQUATORCROSSINGLONGITUDE DOUBLE "NumberofGranules"
Variable
EQUATORCROSSINGDATE DATE "NumberofGranules"
Variable
EQUATORCROSSINGTIME TIME "NumberofGranules"
Variable
END_GROUP = OrbitCalculatedSpatialDomain
GROUP = MeasuredParameter
PARAMETERNAME STRING FR (A) Variable
GROUP = QAFlags
AUTOMATICQUALITYFLAG STRING 1 Variable
AUTOMATICQUALITYFLAGEXPLANATION
STRING 1 Variable
OPERATIONALQUALITYFLAG STRING 1 Variable
OPERATIONALQUALITYFLAGEXPLANATION
STRING 1 Variable
SCIENCEQUALITYFLAG STRING 1 Variable
SCIENCEQUALITYFLAGEXPLANATION
STRING 1 Variable
END_GROUP = QAFlags
GROUP = QAStats
QAPERCENTMISSINGDATA INTEGER 1 Variable
END_GROUP = QAStats
END_GROUP = MeasuredParameter
******************************************************************
* Note that MeasuredParameter group has
* Class = "M" (see sample MCF file).
* Basically one needs to put DataField (SDS) names to PARAMETERNAME
* and put corresponding QA metadata to QAFlags and QAStats.
* If one has only QA metadata for whole product, instead for each
* and individual DatFiels (SDS), it's suggested to put product
* name to PARAMETERNAME.
*******************************************************************
GROUP = AssociatedPlatformInstrumentSensor
ASSOCIATEDPLATFORMSHORTNAME STRING 1 "AM-1"
ASSOCIATEDINSTRUMENTSHORTNAME STRING 1 "MODIS"
ASSOCIATEDSENSORSHORTNAME STRING 1 "CCD"
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 = "FIREPIXELS"
*******************************************************
* Other SCF defined PSA attributes:
*******************************************************
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
ALGORITHMPACKAGEACCEPTANCEDATE
STRING 1 "TBD"
ALGORITHMPACKAGEMATURITYCODE STRING 1 "Preliminary"
ALGORITHMPACKAGENAME STRING 1 "MOD_PRMGR"
ALGORITHMPACKAGEVERSION STRING 1 "2.1"
GEOANYABNORMAL STRING 1 Variable
GEOESTMAXRMSERROR DOUBLE 1 Variable
LONGNAME STRING 1 "MODIS L2G Thermal
Anomalies - 1 km,
Night Mode"
SPSOPARAMETERS STRING 1 "none"
PROCESSINGCENTER STRING 1 "GSFC"
NUMBEROFOVERLAPGRANULES INTEGER 1 Variable
NUMBEROFINPUTGRANULES INTEGER 1 Variable
GRANULENUMBERARRAY INTEGER "NumberofGranules"
Variable
ORBITNUMBERARRAY INTEGER "NumberofGranules"
Variable
GRANULEBEGINNINGDATETIME STRING "NumberofGranules"
Variable
GRANULEENDINGDATETIME STRING "NumberofGranules"
Variable
GRANULEDAYNIGHTFLAG STRING "NumberofGranules"
Variable
MINIMUMLINEINDEX INTEGER "NumberofGranules"
Variable
MAXIMUMLINEINDEX INTEGER "NumberofGranules"
Variable
MINIMUMSAMPLEINDEX INTEGER "NumberofGranules"
Variable
MAXIMUMSAMPLEINDEX INTEGER "NumberofGranules"
Variable
GRANULEPOINTERARRAY INTEGER "NumberofGranules"
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
REFERENCEORBITNUMBER INTEGER 1 Variable
CLOUDPIXELS INTEGER 1 Variable
UNKNOWNPIXELS INTEGER 1 Variable
WATERPIXELS INTEGER 1 Variable
GLINTPIXELS INTEGER 1 Variable
NOFIREPIXELS INTEGER 1 Variable
CLOUDADJACENTFIREPIXELS INTEGER 1 Variable
WATERADJACENTFIREPIXELS INTEGER 1 Variable
PERCENTLAND INTEGER 1 Variable
******************************************************************
* 1. The field "L2GStorageFormat" is either "full",
* "compact" or "one layer only".
* 2. The field "CoverageCalculationMethod" is either
* "area" or "simple PSF".
* 3. The field "FirstLayerSelectionCriteria" is either
* "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 "Data Rows"
XDim:MOD_Grid_L2g_2d "Data Columns"
Corner Locations:
Corner Values
UpperLeftPointMtrs (Variable, Variable)
LowerRightPointMtrs (Variable, Variable)
Geographic Grid Projection Parameters:
Note that all grid parameters are currently under development
and may need to be revised prior to V2.0 code delivery.
Supported Grids: Integerized Sinusoidal (GCTP_ISINUS)
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_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: MOD_Grid_L2g_3d
Dimensions:
Dimension Name Value
Additional Layers:MOD_Grid_L2g_3d "Additional Layers"
YDim:MOD_Grid_L2g_3d "Data Rows"
XDim:MOD_Grid_L2g_3d "Data Columns"
Corner Locations: (same as MOD_Grid_L2g_2d)
Geographic Grid Projection: (same as MOD_Grid_L2g_2d)
===========================================================================
DataFields:
The following datafields are always in this file:
num_observations
fire_mask_1
algorithm_QA_1
FP_line_1
FP_sample_1
FP_power_1
FP_T21_1
FP_confidence_1
If the metadatum "L2GStorageFormat" is "full", the following
datafields are also present:
fire_mask_f
algorithm_QA_f
FP_line_f
FP_sample_f
FP_power_f
FP_T21_f
FP_confidence_f
If the metadatum "L2GStorageFormat" is "compact", the following
datafields are also present:
fire_mask_c
algorithm_QA_c
FP_line_c
FP_sample_c
FP_power_c
FP_T21_c
FP_confidence_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 attributes:
add_offset (float64)
add_offset_err (float64)
calibrated_nt (int32)
scale_factor (float64)
scale_factor_err (float64)
Nadir Data Resolution (STRING)
===========================================================================
Name Data Dimensions
Type
num_observations INT8 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
Description:
The number of 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
fire_mask_1 UINT8 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
fire_mask_f UINT8 "Additional Layers:MOD_Grid_L2g_3d",
"YDim:MOD_Grid_L2g_3d",
"XDim:MOD_Grid_L2g_3d"
fire_mask_c UINT8 metadatum "TotalAdditionalObservations"
Description:
fire mask
"fire_mask_1" is for storing the first layer of observations
and is always stored.
"fire_mask_f" and "fire_mask_c" are for storing the
additional layers of observations. "fire_mask_f" is for the
full format and is stored only if the metadatum
"L2GStorageFormat" is "full". "fire_mask_c" is for the
compact format and is stored only if the metadatum
"L2GStorageFormat" is "compact".
Bit Description
--- -----------
0-3 pixel classification
0 = not processed (missing input data)
1 = not processed (extreme scan angle)
2 = not processed (other reason)
3 = water
4 = cloud
5 = no fire
6 = unknown
7 = fire (low confidence)
8 = fire (nominal confidence)
9 = fire (high confidence)
4-7 spare (set to 0)
HDF Attributes:
Quantity
Attribute Type or Length Value
--------- ---- --------- -----
long_name STRING 37 Variable
units STRING 9 bit field
valid_range UINT8 2 0, 9
_FillValue UINT8 1 0
Nadir Data STRING 3 1km
Resolution
Note: The attribute "long_name" is "fire mask -
- first layer" for "fire_mask_1", "fire mask -
- additional layers, full" for "fire_mask_f", or "fire mask
- additional layers, compact" for "fire_mask_c".
===========================================================================
Name Data Dimensions
Type
algorithm_QA_1 UINT32 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
algorithm_QA_f UINT32 "Additional Layers:MOD_Grid_L2g_3d",
"YDim:MOD_Grid_L2g_3d",
"XDim:MOD_Grid_L2g_3d"
algorithm_QA_c UNIT32 metadatum "TotalAdditionalObservations"
Description:
algorithm QA
"algorithm_QA_1" is for storing the first layer of observations
and is always stored.
"algorithm_QA_f" and "algorithm_QA_c" are for storing the
additional layers of observations. "algorithm_QA_f" is for the
full format and is stored only if the metadatum
"L2GStorageFormat" is "full". "algorithm_QA_c" is for the
compact format and is stored only if the metadatum
"L2GStorageFormat" is "compact".
Bit Description
--- -----------
0-1 MODLAND QA bits
00 = fire/no-fire determined at optimum confidence
01 = fire/no-fire determined at less than optimum confidence
10 = no determination made due to cloud cover
11 = no determination made due to other reason(s)
2 3.9 micron high-gain flag
0 = band 21 used
1 = band 22 used
3 atmospheric correction (0 = not performed, 1 = performed)
4 day/night algorithm (0 = night, 1 = day)
5 potential fire pixel
0 = no (if no, remaining QA fields are empty)
1 = yes
6 fire detection overturned due to sun glint
0 = no
1 = yes
7-10 background window size parameter, R
R = 0: unable to characterize background
R > 0: background characterized with (2R+1) by (2R+1) window
11 20 K TD test [logic b] (0 = fail, 1 = pass)
12 320 K T21 test [logic B] (0 = fail, 1 = pass)
13 TDB test [logic a] (0 = fail, 1 = pass)
14 T21B test [logic A] (0 = fail, 1 = pass)
15 360 K T21 test [logic X] (0 = fail, 1 = pass)
16-20 spare (set to 0)
21-22 0.86 micron covariance index (surface heterogeneity):
00 = undetermined
01 = low
10 = medium
11 = high
23 MOD35 status
0 = unavailable/no determination
1 = available
24 250 m cloud flag (valid only if bit 23 is set)
0 = no
1 = yes
25 adjacent cloud pixel (valid only if fire mask = 7, 8, or 9)
0 = no
1 = yes
26 adjacent water pixel (valid only if fire mask = 7, 8, or 9)
0 = no
1 = yes
27-31 spare (set to 0)
HDF Attributes:
Quantity
Attribute Type or length Value
--------- ---- --------- -----
long_name STRING 40 Variable
units STRING 9 bit field
valid_range UINT32 2 0, 31522815
_FillValue UINT32 1 0
Nadir Data STRING 3 1km
Resolution
Note: The attribute "long_name" is "algorithm QA -
- first layer" for "algorithm QA_1", "algorithm QA -
- additional layers, full" for "algorithm_QA_f", or
"algorithm QA - additional layers, compact" for
"algorithm_QA_c".
===========================================================================
Name Data Dimensions
Type
nadd_obs_row INT32 metadatum "DataRows"
Description:
The number of additional observations in each row in the
compact storage form of the L2G grid.
This field is only stored if the metadatum
"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
=========================================================================
Name Data Dimensions
Type
FP_line_1 UINT32 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
FP_line_f UINT32 "Additional Layers:MOD_Grid_L2g_3d",
"YDim:MOD_Grid_L2g_3d",
"XDim:MOD_Grid_L2g_3d"
FP_line_c UNIT32 metadatum "TotalAdditionalObservations"
Description:
FP_line
"FP_line_1" is for storing the first layer of observations
and is always stored.
"FP_line_f" and "FP_line_f" are for storing the
additional layers of observations. "FP_line_f" is for the
full format and is stored only if the metadatum
"L2GStorageFormat" is "full". "FP_line_c" is for the
compact format and is stored only if the metadatum
"L2GStorageFormat" is "compact".
=========================================================================
Name Data Dimensions
Type
FP_sample_1 UINT32 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
FP_sample_f UINT32 "Additional Layers:MOD_Grid_L2g_3d",
"YDim:MOD_Grid_L2g_3d",
"XDim:MOD_Grid_L2g_3d"
FP_sample_c UNIT32 metadatum "TotalAdditionalObservations"
Description:
FP_sample
"FP_sample_1" is for storing the first layer of observations
and is always stored.
"FP_sample_f" and "FP_sample_c" are for storing the
additional layers of observations. "FP_sample_f" is for the
full format and is stored only if the metadatum
"L2GStorageFormat" is "full". "FP_sample_c" is for the
compact format and is stored only if the metadatum
"L2GStorageFormat" is "compact".
=========================================================================
Name Data Dimensions
Type
FP_power_1 UINT32 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
FP_power_f UINT32 "Additional Layers:MOD_Grid_L2g_3d",
"YDim:MOD_Grid_L2g_3d",
"XDim:MOD_Grid_L2g_3d"
FP_power_c UNIT32 metadatum "TotalAdditionalObservations"
Description:
FP_power
"FP_power_1" is for storing the first layer of observations
and is always stored.
"FP_power_f" and "FP_power_c" are for storing the
additional layers of observations. "FP_power_f" is for the
full format and is stored only if the metadatum
"L2GStorageFormat" is "full". "FP_power_c" is for the
compact format and is stored only if the metadatum
"L2GStorageFormat" is "compact".
=========================================================================
Name Data Dimensions
Type
FP_T21_1 UINT32 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
FP_T21_f UINT32 "Additional Layers:MOD_Grid_L2g_3d",
"YDim:MOD_Grid_L2g_3d",
"XDim:MOD_Grid_L2g_3d"
FP_T21_c UNIT32 metadatum "TotalAdditionalObservations"
Description:
FP_T21
"FP_T21_1" is for storing the first layer of observations
and is always stored.
"FP_T21_f" and "FP_T21_c" are for storing the
additional layers of observations. "FP_T21_f" is for the
full format and is stored only if the metadatum
"L2GStorageFormat" is "full". "FP_T21_c" is for the
compact format and is stored only if the metadatum
"L2GStorageFormat" is "compact".
=========================================================================
Name Data Dimensions
Type
FP_confidence_1 UINT32 "YDim:MOD_Grid_L2g_2d",
"XDim:MOD_Grid_L2g_2d"
FP_confidence_f UINT32 "Additional Layers:MOD_Grid_L2g_3d",
"YDim:MOD_Grid_L2g_3d",
"XDim:MOD_Grid_L2g_3d"
FP_confidence_c UNIT32 metadatum "TotalAdditionalObservations"
Description:
FP_confidence
"FP_confidence_1" is for storing the first layer of observations
and is always stored.
"FP_confidence_f" and "FP_confidence_c" are for storing the
additional layers of observations. "FP_confidence_f" is for the
full format and is stored only if the metadatum
"L2GStorageFormat" is "full". "FP_confidence_c" is for the
compact format and is stored only if the metadatum
"L2GStorageFormat" is "compact".