A combination of Bands 2, 2, 1 displays a false-color Surface Reflectance image using 250-m data acquired between February 10–17, 2007 over parts of Chile and Argentina (h12v12). The fertile Central Valley of Chile appears to the southwest in red, as do the agricultural lowlands of Argentina's Las Pampas in the northeast corner of the image.
The MODIS Surface Reflectance products provide an estimate of the surface spectral reflectance as it would be measured at ground level in the absence of atmospheric scattering or absorption. Low-level data are corrected for atmospheric gases and aerosols, yielding a level-2 basis for several higher-order gridded level-2 (L2G) and level-3 products.
MOD09Q1 provides Bands 1 and 2 at 250-meter resolution in an 8-day gridded level-3 product in the Sinusoidal projection. Each MOD09Q1 pixel contains the best possible L2G observation during an 8-day period as selected on the basis of high observation coverage, low view angle, the absence of clouds or cloud shadow, and aerosol loading. Science Data Sets provided for this product include reflectance values for Bands 1 and 2, and a quality rating.
Version-5 MODIS/Terra Surface Reflectance products are Validated Stage 2, meaning that accuracy has been assessed over a widely distributed set of locations and time periods via several ground-truth and validation efforts.
See Product Description
Science Data Sets for MODIS Terra Surface Reflectance 8-Day L3 Global 250m SIN Grid V005 (MOD09Q1):
Science Data Sets (HDF Layers) (3)
MULTIPLY BY SCALE FACTOR
|250m Surface Reflectance Band 1 (620–670 nm)||Reflectance||16-bit signed integer||-28672||-100–16000||0.0001|
|250m Surface Reflectance Band 2 (841–876 nm)||Reflectance||16-bit signed integer||-28672||-100–16000||0.0001|
|250m Reflectance Band Quality||Bit Field||16-bit unsigned integer||65535||0–32767||na|
The QA information below is excerpted from an HDF-EOS file of the MODIS Surface Reflectance product MOD09Q1.
Table 1: MOD09Q1.005 250-meter Surface Reflectance Data QA Descriptions (16-bit)
|14||different orbit from 500 m||1||yes|
|13||adjacency correction performed||1||yes|
|12||atmospheric correction performed||1||yes|
|8–11||band 2 data quality four bit range||0000||highest quality|
|1000||dead detector; data copied from adjacent detector|
|1001||solar zenith >= 86 degrees|
|1010||solar zenith >= 85 and < 86 degrees|
|1100||internal constant used in place of climatological data for at least one atmospheric constant|
|1101||quality so low that it is not useful|
|1110||L1B data faulty|
|1111||not useful for any other reason or not processed due to deep ocean or clouds|
|4–7||band 1 data quality four bit range||SAME AS ABOVE|
|11||not set; assumed clear|
|0–1||MODLAND QA bits||00||corrected product produced at ideal quality all bands|
|01||corrected product produced at less than ideal quality some or all bands|
|10||corrected product not produced due to cloud effects all bands|
|11||corrected product not produced due to other reasons some or all bands may be fill value [Note that a value of (11) overrides a value of (01)].|
|Temporal Coverage||February 24, 2000 -|
|Area||~10 x 10 lat/long|
|File Size||~72 MB|
|Dimensions||4800 x 4800 rows/columns|
|Science Data Sets (SDS HDF Layers)||3|
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