|
| EDG Data Set Name |
Granule Shortname |
| MODIS/Aqua Surface Reflectance Daily L2G Global 250m SIN Grid |
MYD09GQK |
| Version |
Acquisition Range |
Science Quality Status |
| V003 |
March 6 2003 (2003065) |
Provisional |
Data Set Characteristics
Area = ~ 10° x 10° lat/long
Image Dimensions = 2 (4800x4800 row/column)
Average File Size = 196 MB
Resolution = 250 meters
Projection = Sinusoidal
Data Format = HDF-EOS
Science Data Sets (SDSs) = 5
Product Description
MODIS 250 m Surface Reflectance is a two-band product computed from the MODIS Level 1B
land bands 1 and 2 (centered at 648 nm and 858 nm, respectively). The product is
an estimate of the surface spectral reflectance for each band as it would be
measured at ground level if there were no atmospheric scattering or absorption.
A correction scheme reducing the effects of atmospheric gases, aerosols, and
thin cirrus clouds is applied to all pixels passing Level 1B quality control.
The MODIS/Aqua Surface Reflectance Daily L2G Global 250m SIN Grid product (MYD09GQK)
shown above is a false-color image derived from the 250m data in Bands 1 and 2.
Data from Bands 3-7 (500m resolution) are not included in this product. MYD09GQK
is processed globally every day using Level 2G 250m Pointer Files (MYDPTQKM)
to place Level 2 Surface Reflectance (MYD09) on a geographic grid. Quality assurance data for the MYD09GQK product is provided at three different levels: for the individual pixel, for each band, and for the whole
file.
NOTE: These products are provisional, meaning that product quality may not be optimal. Incremental product improvements are still occurring, and users are urged to contact MODIS Science Team representatives prior to use of the data in publications. These data are likely to be replaced when the validated product becomes available.
| SDS |
Units |
Data Type |
Fill Value |
Valid Range |
Divide by
Scale Factor |
| 250m Surface Reflectance Band 1 (620-670 nm) |
Reflectance |
16-bit signed integer |
-28672 |
-100 - 16000 |
10000 |
| 250m Surface Reflectance Band 2 (841-876 nm) |
Reflectance |
16-bit signed integer |
-28672 |
-100 - 16000 |
10000 |
| *250m Reflectance Band Quality |
Bit field |
16-bit unsigned integer |
2995 |
0 |
na |
| Orbit and coverage |
Bit field |
8-bit unsigned integer |
15 |
0 - 255 |
na |
| Number of Observations |
na |
8-bit signed integer |
-1 |
0 - 127 |
na |
*Quality Control Bit Index: - Bits are numbered from left (MSB) to right (LSB)
| Bit |
Description |
| 0-1 |
spare (unused); |
| 2 |
adjacency correction performed; |
| |
1 -- yes |
| |
0 -- no |
| 3 |
atmospheric correction performed; |
| |
1 -- yes |
| |
0 -- no |
| 4 - 7 |
band 2 data quality four bit range; |
| |
0000 -- highest quality |
| |
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 |
| 8 - 11 |
band 1 data quality four bit range; |
| |
SAME AS ABOVE |
| 12 - 13 |
cloud state; |
| |
00 -- clear |
| |
01 -- cloudy |
| |
10 -- mixed |
| |
11 -- not set, assumed clear |
| 14-15 |
MODLAND QA bits; |
| |
corrected product produced at |
| |
00 -- ideal quality all bands |
| |
01 -- less than ideal quality some or all bands |
| |
corrected product not produced due to |
| |
10 -- cloud effects all bands |
| |
11 -- other reasons some or all bands may be fill value
[Note that a value of (11) overrides a value of (01)]. |
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EOS Data Gateway Search Tips
| Data Center: |
LPDAAC |
| Sensor: |
MODIS |
| Dataset: |
MODIS/Aqua Surface Reflectance Daily L2G Global 250m SIN Grid |
| Spatial: |
HORIZONTALTILENUMBER Max/Min VERTICALTILENUMBER Max/Min |
| Geographic Extent: |
Type Lat/Long Range or Draw on Map |
| Temporal Extent: |
2003-03-06 to present |
Product Information 
Contact Information
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