This is an NDVI image created by using two MODIS 250-m reflectance data acquired March 28, 2007 over Mexico (h08v06).
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.
MOD09GQ provides Bands 1 and 2 at a 250-meter resolution in a daily gridded L2G product in the Sinusoidal projection. Science Data Sets provided for this product include reflectance for Bands 1 and 2, a quality rating, observation coverage, and observation number. This product is meant to be used in conjunction with the MOD09GA where important quality and viewing geometry information is stored.
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. Although there may be later improved versions, these data are ready for use in scientific publications.
Temporal Coverage | February 24, 2000 - |
Area | ~10 x 10 lat/long |
File Size | 280 MB compressed |
Projection | Sinusoidal |
Data Format | HDF-EOS |
Dimensions | 4800 x 4800 rows/columns |
Resolution | 250 meters |
Science Data Sets (SDS HDF Layers) | 5 |
Science Data Sets for MODIS Terra Surface Reflectance Daily L2G Global 250m SIN Grid V005 (MOD09GQ):
Science Data Sets (HDF Layers) (5) |
UNITS |
BIT TYPE |
FILL |
VALID RANGE |
MULTIPLY BY SCALE FACTOR |
---|---|---|---|---|---|
num_observations: number of observations within the pixel | None | 8-bit signed integer | -1 | 0–127 | na |
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 | 2995 | 0–4096 | na |
obs_cov: percentage of the grid cell area is covered by the observation | Percent | 8-bit signed integer | -1 | 0–100 |
(0.001) 0.009999999776482582 |
The QA information below is excerpted from an HDF-EOS file of the MODIS Surface Reflectance product MOD09GQ.
Table 1: MOD09GQ.005 250-meter Surface Reflectance Data QA Descriptions (16-bit)
Bit No. |
Parameter Name |
Bit Comb. |
Sur_refl_qc_250m |
---|---|---|---|
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)]. | ||
2–3 | cloud state | 00 | clear |
01 | cloudy | ||
10 | mixed | ||
11 | not set; assumed clear | ||
4–7 | 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 | ||
8–11 | band 2 data quality four bit range | SAME AS BAND ABOVE | |
12 | atmospheric correction performed | 1 | yes |
0 | no | ||
13 | adjacency correction performed | 1 | yes |
0 | No | ||
14–15 | spare (unused) | - | --- |
Please find the current MODIS-related Data Redistribution and Pricing policies on the MODIS Policies Section of this Web Site
LP DAAC Acknowledgement and Citations Policy
In the event that data distributed from the Land Processes DAAC are incorporated into your research, please supply the following acknowledgment within your published work: "These data are distributed by the Land Processes Distributed Active Archive Center (LP DAAC), located at the U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center (lpdaac.usgs.gov)." If possible, please e-mail or send us reprints/citations of papers or oral presentations based on data obtained from the LP DAAC (see below for mailing address and e-mail address). This will help us to stay informed of how the data are being utilized.
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U.S. Geological Survey (USGS)
Earth Resources Observation and Science (EROS) Center
47914 252nd Street
Sioux Falls, SD 57198-0001
The complete data record for this product is available through the WIST search and order interface. The most recent 10 days of the product record is available on-line through the Data Pool.
Please find links to (and information about) these data access tools on the Get Data Section of this Web Site.
U.S. Geological Survey (USGS)
Center for Earth Resources Observation and Science (EROS)
47914 252nd Street
Sioux Falls, SD 57198-0001
Phone Number: | 605-594-6116 |
Toll Free: | 866-573-3222 |
866-LPE-DAAC | |
Fax: | 605-594-6963 |
Email: | lpdaac@eos.nasa.gov |
Web: | http://lpdaac.usgs.gov |