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 EDG Data Set Name
MODIS/Terra Surface Reflectance 8-Day L3 Global 250m ISIN Grid
Granule Shortname
MOD09Q1
Data Set Characteristics
Area = ~ 10° x 10° lat/long
Image Dimensions = 4800 x 4800 rows/columns
File Size = ~139 MB
Resolution = 250 meters
Projection = Integerized Sinusoidal
Data Format = HDF-EOS
Science Data Sets (SDSs) = 3
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 non-cloudy pixels passing Level 1B quality control.
The MODIS/Terra Surface Reflectance 8-Day L3 Global 250m ISIN Grid product, MOD09Q1, is a composite of the previous 8 daily L2G Surface Reflectance products (MOD09GQK), which maintain the native 250m resolution in Bands 1 and 2. The best observations during an 8-day period, as determined by overall pixel quality, observational coverage, and minimum 500m Band 3 value, are matched geographically according to corresponding 250m Pointer Files (MODPTQKM). Quality assurance data for the MOD09Q1 product is provided at three different levels of detail: at the individual pixel level, at each band and each resolution level, and at the level of the whole file.
| SDS |
RESOLUTION |
UNITS |
DATA TYPE-bit |
FILL VALUE |
VALID RANGE |
SCALE FACTOR |
| Band 1 (620-670 nm) |
250m |
Reflectance |
16-bit sign int |
-28672 |
-100-16000 |
10000 |
| Band 2 (841-876 nm) |
250m |
Reflectance |
16-bit sign int |
-28672 |
-100-16000 |
10000 |
| QC Flags - 250m |
250m |
Bit field |
16-bit signed int |
65535 |
0 |
na |
*Quality Control Bit Index:
| 0-1 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)].
|
| 2-5 |
band 1 data quality, four bit range;
0 = highest quality
8 = dead detector; data interpolated in L1B
9 = solar zenith >= 86 degrees
10 = solar zenith >= 85 and > 86 degrees
11 = missing input
12 = internal constant used in place of climatological data for at least one atmospheric constant
13 = correction out of bounds, pixel constrained to extreme allowable value
14 = L1B data faulty
15 = not processed due to deep ocean or clouds
|
| 6-9 |
band 2 data quality, four bit range;
SAME AS ABOVE
|
| 10-13 |
band 3 data quality, four bit range;
SAME AS ABOVE
|
| 14-17 |
band 4 data quality, four bit range;
SAME AS ABOVE
|
| 18-21 |
band 5 data quality, four bit range;
SAME AS ABOVE
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| 22-25 |
band 6 data quality, four bit range;
SAME AS ABOVE
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| 26-29 |
band 7 data quality, four bit range;
SAME AS ABOVE
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| 30 |
atmospheric correction performed;
1 -- yes
0 -- no
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| 31 |
adjacency correction performed;
1 -- yes
0 -- no
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EOS Data Gateway Search Tips
| Data Center: |
LPDAAC |
| Sensor: |
MODIS |
| Dataset: |
MODIS/Terra Surface Reflectance 8-Day L3 Global 250m ISIN Grid |
| Geographic Extent: |
Type Lat/Long Range or Draw on Map |
| Temporal Extent: |
August 29, 2002 (2002241) - October 7, 2002 (2002280) |
Product Information
Contact Information
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