|
| EDG Data Set Name |
Granule Shortname |
| MODIS/Terra Surface Reflectance 8-Day L3 Global 250m SIN Grid |
MOD09Q1 |
| Version |
Acquisition Range |
Science Quality Status |
| V003 |
August 29, 2002 (2002241) - October 7, 2002 (2002280) |
Provisional as of Nov 1, 2000 |
| V004 |
February 24, 2000 (2000055) |
|
Data Set Characteristics
Area = ~ 10° x 10° lat/long
Image Dimensions = 2 (4800x4800 row/column)
Average File Size = 139 MB
Resolution = 250 meters
Projection = 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 pixels passing Level 1B
quality control.
The MODIS/Terra
Surface Reflectance 8-Day L3 Global 250m SIN 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 and
observational coverage, 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.
NOTE: These products are validated, meaning that product uncertainties are well defined over a range of representative conditions. Although there may be later improved versions, these data are ready for use in scientific publications.
| SDS |
Units |
Data Type-bit |
Fill Value |
Valid Range |
Multiply by
Scale Factor |
| Surface Reflectance for band 1 (620-670 nm) |
reflectance |
16-bit signed integer |
-28672 |
-100 - 16000 |
0.0001 |
| Surface Reflectance for band 2 (841-876 nm) |
reflectance |
16-bit signed integer |
-28672 |
-100 - 16000 |
0.0001 |
| *Surface reflectance 250m quality control flags |
Bit field |
16-bit unsigned integer |
65535 |
0-4294966531 |
na |
*Quality Control Bit Index:
| 0-1 MODLAND QA bits; |
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;
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
|
| 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
|
| 22-25 |
band 6 data quality, four bit range;
SAME AS ABOVE
|
| 26-29 |
band 7 data quality, four bit range;
SAME AS ABOVE
|
| 30 |
atmospheric correction performed;
1 -- yes
0 -- no
|
| 31 |
adjacency correction performed;
1 -- yes
0 -- no
|
Print or save this information in .pdf format
View .pdf version 
 Retrieve the MOD09Q1v4 MODIS product through the LP DAAC Data Pool
Via Search Tool: http://e0dps01u.ecs.nasa.gov:22000/OPS/drill?attrib=esdt&esdt;=MOD09Q1.4&group;=MOLT
Via FTP Directory: ftp://e0dps01u.ecs.nasa.gov/MOLT/MOD09Q1.004/
Order Data through the EOS Data Gateway
( http://edcimswww.cr.usgs.gov/pub/imswelcome/)
EOS Data Gateway Search Tips
| Data Center: |
LPDAAC |
| Sensor: |
MODIS |
| Dataset: |
MODIS/Terra Surface Reflectance 8-Day L3 Global 250m SIN Grid |
| Spatial: |
HORIZONTALTILENUMBER Max/Min VERTICALTILENUMBER Max/Min |
| Geographic Extent: |
Type Lat/Long Range or Draw on Map |
| Temporal Extent: |
2000-02-24 to present |
Product Information
Contact Information
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