|
| EDG Data Set Name |
Granule Shortname |
| MODIS/Aqua Surface Reflectance 8-Day L3 Global 250m SIN Grid |
MYD09Q1 |
| Version |
Acquisition Range |
Science Quality Status |
| V003 |
March 6 2003 (2003065) - February 1 2004 (2002032) |
Provisional |
| V004 |
July 4 2002 (2002185) |
Provisional |
Data Set Characteristics
Area = ~ 10° x 10° lat/long
Image Dimensions = 2 (4800x4800 row/column)
Average File Size = 138 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/Aqua Surface Reflectance 8-Day L3 Global 250m SIN Grid product, MYD09Q1, is a composite of the previous 8 daily L2G Surface Reflectance products (MYD09GQK), 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 (MYDPTQKM). Quality assurance data for the MYD09Q1 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.
The false color image shown is an example of the 8-Day 250m Surface Reflectance displayed using a Band 2-1-1 (band 2: 841-876 nm, band 1: 620-670 nm) combination. Vegetation appears red, water appears blue, and clouds appear yellow over Tile h09v07 covering Yucatan, Honduras, and Nicaragua between February 2 - 9, 2004.
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-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:
Bits are numbered from LSB (right) to MSB (left)
| 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
|
| 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
|
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 Retrieve the MYD09Q1v4 MODIS product through the LP DAAC Data Pool
Via Search Tool: http://e0dps01u.ecs.nasa.gov:22000/OPS/drill?attrib=esdt&esdt;=MYD09Q1.4&group;=MOLA
Via FTP Directory: ftp://e0dps01u.ecs.nasa.gov/MOLA/MYD09Q1.004/
Order Data through the EOS Data Gateway
( http://edcimswww.cr.usgs.gov/pub/imswelcome/)
EOS Data Gateway Search Tips
| Source: |
Aqua |
| Sensor: |
MODIS |
| Dataset: |
MODIS/Aqua 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: |
2003-03-06 to 2004-02-01 (V003); 2002-07-04 to present (V004) |
Product Information 
Contact Information
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