HDF-EOS V2 MODIS L3 Surface Reflectance Product
Revision 6.0.0, 09-FEB-09
Product ID: MOD_PR09Q1
Description:
MODIS Level-3 (L3) Land Surface Reflectance (LSR) - The L3 LSR product
is a composite over a eight day period of the LSR data. For each
grid location one value is selected which is the best possible value
of the surface reflectance. The criteria for the choice are the
cloudiness; cloud shadows; low solar zenith angle; and when several
values pass these minimum quality criteria, the minimum channel 3
(blue) value.
Point of Contact:
Jim Ray
Science Systems and Applications, Inc.
NASA's Goddard Space Flight Center, Code 614.5
Greenbelt, MD 20771
Principal Investigator:
Eric Vermote
NASA's Goddard Space Flight Center, Code 619
Greenbelt, MD 20771
===========================================================================
ECS metadata
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StructuralMetadata.0
This string will be populated automatically by HDF-EOS.
Grid Structure: MOD_Grid_250m_Surface_Reflectance
Data Fields:
sur_refl_b01, sur_refl_b02 and sur_refl_qc_250m
Dimensions:
Dimension Name Metadata Value
YDim_MOD_Grid_250m_Surface_Reflectance "DataRows250m"
XDim_MOD_Grid_250m_Surface_Reflectance "DataColumns250m"
Corner Locations:
Corner Values
UpperLeftPointMtrs (Variable, Variable)
LowerRightPointMtrs (Variable, Variable)
Geographic Grid Projection Parameters:
Integrized Sinusoidal Projection
Projection GCTP_SNSOID
ProjParam[0] 6371007.181
ProjParam[1 to 7] 0.0
ProjParam[8] 21600
ProjParam[9] 0.0
ProjParam[10] 1.0
ProjParam[11 to 12] 0.0
Spherecode -1
GridOrigin HDFE_GD_UL
Interrupted Goodes Homolosine Projection
Projection GCTP_GOOD
ProjParam[0 to 12] 0.0
Spherecode 19
GridOrigin HDFE_GD_UL
Lambert Azimuthal Equal Area Projection
Projection 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
===========================================================================
Data Fields:
Each data field 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 data fields also contain some of the following attributes:
add_offset (float64)
add_offset_err (float64)
calibrated_nt (int32)
scale_factor (float64)
scale_factor_err (float64)
QA bitmap index (STRING)
Data conversions:
parameter = scale_factor * (file data - add_offset)
file data = (parameter / scale_factor) + add_offset
The dimensions for all SDSs are
YDim_MOD_Grid_250m_Surface_Reflectance
XDim_MOD_Grid_250m_Surface_Reflectance
A value of "Variable" indicates that this value will vary
according to the granule being processed.
===========================================================================
Name Data Dimensions
Type
sur_refl_b01 INT16 (see grid structure)
Description:
MODIS Land Surface Reflectance for Band 1.
HDF Attributes:
Number of
Values or
Max.
Attribute Data String Value
Type Length
long_name STRING 60 Surface_reflectance_for_band_1
units STRING 11 reflectance
valid_range INT16 2 -100, 16000
_FillValue INT16 1 -28672
scale_factor FLOAT64 1 0.0001
add_offset FLOAT64 1 0.0
scale_factor_err FLOAT64 1 0.0
add_offset_err FLOAT64 1 0.0
calibrated_nt INT32 1 5
===========================================================================
Name Data Dimensions
Type
sur_refl_b02 INT16 (see grid structure)
Description:
MODIS Land Surface Reflectance for Band 2.
HDF Attributes:
Number of
Values or
Max.
Attribute Data String Value
Type Length
long_name STRING 60 Surface_reflectance_for_band_2
units STRING 11 reflectance
valid_range INT16 2 -100, 16000
_FillValue INT16 1 -28672
scale_factor FLOAT64 1 0.0001
add_offset FLOAT64 1 0.0
scale_factor_err FLOAT64 1 0.0
add_offset_err FLOAT64 1 0.0
calibrated_nt INT32 1 5
===========================================================================
Name Data Dimensions
Type
sur_refl_state_250m UINT16 (see grid structure)
Description:
MODIS Land Surface Reflectance 250m State flags.
Bit Description
15 PGE11 internal snow mask;
key: snow (1) or no snow (0)
14 BRDF correction performed;
key: yes (1) or no (0)
13 Pixel is adjacent to cloud;
key: yes (1) or no (0)
12 Snow/ice flag;
key: yes (1) or no (0)
11 PGE11 internal fire mask;
key: fire (1) or no fire (0)
10 PGE11 internal cloud mask;
key: cloudy (1) or clear (0)
8-9 Cirrus detected;
key: 00 (0): none
01 (1): small
10 (2): average
11 (3): high
6-7 Aerosol quantity;
key: 00 (0): climatology
01 (1): low
10 (2): average
11 (3): high
3-5 Land/water flag;
key: 000 (0): shallow ocean
001 (1): land
010 (2): ocean coastlines and land shorelines
011 (3): shallow inland water
100 (4): ephemeral water
101 (5): deep inland water
110 (6): ocean
111 (7): surface unknown (treated as land)
2 Cloud shadow;
key: yes (1) or no (0)
0-1 Cloud state;
key: 00 (0): clear
01 (1): cloudy
10 (2): mixed
11 (3): not set, assumed clear
HDF Attributes:
Number of
Values or
Max.
Attribute Data String Value
Type Length
long_name STRING 60 Surface_reflectance_250m_state_flags
units STRING 9 bit field
valid_range UINT16 2 0, 57343
_FillValue UINT16 1 65535
QA bitmap index STRING 2400 an index of how each value is
mapped (see the description, above)
===========================================================================
Name Data Dimensions
Type
sur_refl_qc_250m UINT16 (see grid structure)
Description:
MODIS Land Surface Reflectance 250m Band Quality Control flags.
Bit Description
15 Spare (TBD)
14 Different orbit from 500m;
key: yes (1) or no (0)
13 Adjacency correction performed;
key: yes (1) or no (0)
12 Atmospheric correction performed;
key: yes (1) or no (0)
8-11 Band 2 data quality, four bit range; test
key: 0000 (0): highest quality
0111 (7): noisy detector
1000 (8): dead detector; data copied from adjacent
detector
1001 (9): solar zenith >= 86 degrees
1010 (10): solar zenith >= 85 and < 86 degrees
1011 (11): missing input
1100 (12): internal constant used in place of
climatological data for at least one
atmospheric constant
1101 (13): quality so low that it is not useful
1110 (14): L1B data faulty
1111 (15): not useful for any other reason/not
processed (e.g. clouds, ocean)
4-7 Band 1 data quality, four bit range;
key: (same as "Band 2 data quality")
2-3 Spare (TBD)
0-1 MODLAND QA bits;
key: 00 (0): corrected product produced at ideal
quality -- all bands
01 (1): corrected product produced,
less than ideal quality -- some or all bands
10 (2): corrected product not produced due to
cloud effects -- all bands
11 (3): corrected product not produced for
other reasons -- some or all bands,
may be fill value
[Note that a value of (11) overrides a value of (01)]
HDF Attributes:
Number of
Values or
Max.
Attribute Data String Value
Type Length
long_name STRING 60 Surface_reflectance_250m_quality_control_flags
units STRING 9 bit field
valid_range UINT16 2 0, 32767
_FillValue UINT16 1 65535
QA bitmap index STRING 2200 an index of how each value is
mapped (see the description, above)