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A combination of Bands 1, 4, 3 displays an R, G, B Surface Reflectance image using 500-m data acquired between March 14 - 21, 2007 over western France, Portugal, Spain, and Morocco. The image was created using the MRT to mosaic two tiles across Spain (h17v04 and h17v05). No reprojection was performed on this mosaic, as the Sinusoidal mapping grid shows little distortion in this globally central region.
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.
MYD09A1 provides Bands 1–7 at 500-meter resolution in an 8-day gridded level-3 product in the Sinusoidal projection. Each MYD09A1 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 1–7, quality assessment, and the day of the year for the pixel along with solar, view, and zenith angles.
Version-5 MODIS/Aqua 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 Aqua Surface Reflectance 8-Day L3 Global 500m SIN Grid V005 (MYD09A1):
Science Data Sets (HDF Layers) (13)
MULTIPLY BY SCALE FACTOR
|500m Surface Reflectance Band 1 (620–670 nm)||Reflectance||16-bit signed integer||-28672||-100–16000||0.0001|
|500m Surface Reflectance Band 2 (841–876 nm)||Reflectance||16-bit signed integer||-28672||-100–16000||0.0001|
|500m Surface Reflectance Band 3 (459–479 nm)||Reflectance||16-bit signed integer||-28672||-100–16000||0.0001|
|500m Surface Reflectance Band 4 (545–565 nm)||Reflectance||16-bit signed integer||-28672||-100–16000||0.0001|
|500m Surface Reflectance Band 5 (1230–1250 nm)||Reflectance||16-bit signed integer||-28672||-100–16000||0.0001|
|500m Surface Reflectance Band 6 (1628–1652 nm)||Reflectance||16-bit signed integer||-28672||-100–16000||0.0001|
|500m Surface Reflectance Band 7 (2105–2155 nm)||Reflectance||16-bit signed integer||-28672||-100–16000||0.0001|
|500m Reflectance Band Quality||Bit Field||32-bit unsigned integer||4294967295||0–4294966531||na|
|Solar Zenith Angle||Degree||16-bit signed integer||0||0–18000||0.01|
|View Zenith Angle||Degree||16-bit signed integer||0||0–18000||0.01|
|Relative Azimuth Angle||Degree||16-bit signed integer||0||-18000–18000||0.01|
|500m State Flags||Bit field||16-bit unsigned integer||65535||0–57343||na|
|Day of Year||Julian day||16-bit unsigned integer||65535||1–366||na|
The QA information below is excerpted from an HDF-EOS file of the MODIS Surface Reflectance product MYD09A1.
The MYD09A1 product includes two QA layers, one relating band specific quality (Table 1), and the other presenting the surface reflectance state (Table 2).
Table 1: MYD09A1.005 500-meter Surface Reflectance Data QA Descriptions (32-bit)
|31||adjacency correction performed||1||yes|
|30||atmospheric correction performed||1||yes|
|26–29||band 7 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|
|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|
|22–25||band 6 data quality four bit range||SAME AS BAND ABOVE|
|18–21||band 5 data quality four bit range||SAME AS BAND ABOVE|
|14–17||band 4 data quality four bit range||SAME AS BAND ABOVE|
|10–13||band 3 data quality four bit range||SAME AS BAND ABOVE|
|6–9||band 2 data quality four bit range||SAME AS BAND ABOVE|
|2–5||band 1 data quality four bit range||SAME AS BAND ABOVE|
|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)].|
Table 2: MYD09A1.005 500-meter Surface Reflectance Data State QA Descriptions (16-bit)
|15||internal snow algorithm flag||1||yes|
|14||BRDF correction performed||1||yes|
|13||Pixel is adjacent to cloud||1||yes|
|12||MOD35 snow/ice flag||1||yes|
|11||internal fire algorithm flag||1||fire|
|10||internal cloud algorithm flag||1||cloud|
|3–5||land/water flag||000||shallow ocean|
|010||ocean coastlines and lake shorelines|
|011||shallow inland water|
|101||deep inland water|
|11||not set, assumed clear|
|Temporal Coverage||July 4, 2002 -|
|Area||~10 x 10 lat/long|
|File Size||~64 MB|
|Dimensions||2400 x 2400 rows/columns|
|Science Data Sets (SDS HDF Layers)||13|
Please find the current MODIS-related Data policies on the MODIS Policies page at https://lpdaac.usgs.gov/products/modis_policies.
For information on how to cite LP DAAC data, please see our Data Citations page at https://lpdaac.usgs.gov/about/citing_lp_daac_and_data.
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GloVis: The Global Visualization interface provides access to tiled MODIS products that have an associated browse image, and all ASTER level-1B products.
MRTWeb: The MODIS Reprojection Tool Web interface provides access to all MRT services offered by the stand-alone MRT.
The Data Access section of this Web site also provides access to these interfaces.
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