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EDG Data Set Name
MODIS/Terra Surface Reflectance 8-Day L3 Global 500m ISIN Grid
Granule Shortname
MOD09A1
Data Set Characteristics
Area = ~ 10° x 10° lat/long
Image Dimensions = 2400 x 2400 rows/columns
File Size = 50 – 500 MB
Resolution = 500 meters
Projection = Integerized Sinusoidal
Data Format = HDF-EOS
Science Data Sets (SDSs) = 12
Product Description
The MOD09A1 image shown above is a sample of the Level 3, 8-day composite of 500m Level 2G Surface Reflectance bands 1 (red), 4 (green) and 3 (blue). This product is computed from the MODIS Level 1B land bands 1-7. Other MOD09 products available from LP DAAC include Level 2G Daily Surface Reflectance at 500m ( MOD09GHK ) at 500m resolutions and State QA ( MOD09GST ) at 1 Km resolutions. The product is an estimate of the surface spectral reflectance for each band as it would have been measured at ground level if there were no atmospheric scattering or absorption. The correction scheme compensates for the effects of atmospheric gases, aerosols, and thin cirrus clouds; it is applied to all non-cloudy MOD35 Level 1B pixels that pass the Level 1B quality control. It uses input from: Bidirectional Reflectance Distribution Function (BRDF)/Albedo Product (MOD43), Atmospheric Profiles (MOD07) for ozone, Total Precipitable Water (MOD05) for water vapor, Aerosol Product (MOD04) for aerosols, and MODIS band 26 for cirrus clouds. The best available ancillary or climatology data are used if these MODIS-specific inputs are unavailable. Level 2G Surface Reflectance is used to derive several higher-level land products: Vegetation Indices (MOD13), BRDF (MOD43), Thermal Anomaly/Fire (MOD14), and Fraction of Photosynthetically Active Radiation/Leaf Area Index (MOD15).
The MOD09A1 product may be used to generate land-related products, or as input to global and regional climate models and surface energy balance models. These data may also be used for land characterization research.
NOTE: These products are still experimental in nature upon their initial release. Investigations are underway to assess the scientific validity of these products.
| SDS |
UNITS |
DATA TYPE-bit |
FILL VALUE |
VALID RANGE |
SCALE FACTOR |
| Band 1 (620-670 nm) |
reflectance |
16-bit integer |
-28672 |
-100-16000 |
10000 |
| Band 2 (841-876 nm) |
reflectance |
16-bit integer |
-28672 |
-100-16000 |
10000 |
| Band 3 (459-479 nm) |
reflectance |
16-bit integer |
-28672 |
-100-16000 |
10000 |
| Band 4 (545-565 nm) |
reflectance |
16-bit integer |
-28672 |
-100-16000 |
10000 |
| Band 5 (1230-1250 nm) |
reflectance |
16-bit integer |
-28672 |
-100-16000 |
10000 |
| Band 6 (1628-1652 nm) |
reflectance |
16-bit integer |
-28672 |
-100-16000 |
10000 |
| Band 7 (2105-2155 nm) |
reflectance |
16-bit integer |
-28672 |
-100-16000 |
10000 |
| QC Flags |
Bit field |
32-bit unsigned integer |
4294967295 |
0-4294966531 |
na |
| Solar Zenith Angle |
degree |
16-bit integer |
0 |
0-18000 |
100 |
| Viewing Angle |
degree |
16-bit integer |
0 |
0-18000 |
100 |
| Relative Azimuth |
degree |
16-bit integer |
0 |
-18000-18000 |
100 |
| State Flag |
Bit field |
16-bit unsigned integer |
65535 |
0-57343 |
na |
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EOS Data Gateway Search Tips
| Data Center: |
LPDAAC |
| Sensor: |
MODIS |
| Dataset: |
MODIS/Terra Surface Reflectance 8-Day L3 Global 500m 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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