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Description

The Moderate Resolution Imaging Spectroradiometer (MODIS) Terra MOD09A1 Version 6.1 product provides an estimate of the surface spectral reflectance of Terra MODIS Bands 1 through 7 corrected for atmospheric conditions such as gasses, aerosols, and Rayleigh scattering. Along with the seven 500 meter (m) reflectance bands are two quality layers and four observation bands. For each pixel, a value is selected from all the acquisitions within the 8-day composite period. The criteria for the pixel choice include cloud and solar zenith. When several acquisitions meet the criteria the pixel with the minimum channel 3 (blue) value is used.

Known Issues

Version Description

The following changes and improvements were implemented for inputs to MODIS Version 6.1 surface reflectance data products: (1) Version 6.1 Level-1B (L1B) products have been improved by undergoing various calibration changes that include: changes to the response-versus-scan angle (RVS) approach that affects reflectance bands for Aqua and Terra MODIS, corrections to adjust for the optical crosstalk in Terra MODIS infrared (IR) bands, and corrections to the Terra MODIS forward look-up table (LUT) update for the period 2012 – 2017, and (2) A polarization correction has been applied to the L1B Reflective Solar Bands (RSB).

Product Summary

Platforms
Terra
Instruments
MODIS
Spatial Extent

N: 90 S: -90 E: 180 W: -180

Spatial Resolution
500 Meters x 500 Meters
Geographic Region
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2000-02-18 to Present
Temporal Resolution
8 Day
Data Partner
Land Processes Distributed Active Archive Center (LP DAAC) ,
MODIS Adaptive Processing System, Terrestrial Information Systems Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/TISL/MODAPS)
Concept ID
C2343111356-LPCLOUD
Data State
ACTIVE
Number of Files/Granules
371251
Processing Level
3
Published
Updated
Science Keywords
Reflectance

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Vermote, E. (2021). MODIS/Terra Surface Reflectance 8-Day L3 Global 500m SIN Grid V061 [Data set]. NASA Land Processes Distributed Active Archive Center. https://doi.org/10.5067/MODIS/MOD09A1.061 Date Accessed: 2025-12-14

File Naming Convention

MOD09A1.A2025209.h28v12.061.2025218035852.hdf

The file name begins with the Product Short Name (MOD09A1) followed by the Julian Date of Acquisition formatted as AYYYYDDD (A2025209), the Tile Identifier which is horizontal tile and vertical tile provided as hXXvYY (h28v12), the Version of the data collection (061), the Julian Date and Time of Production designated as YYYYDDDHHMMSS (2025218035852), and the Data Format (hdf).

Documents

USER'S GUIDE

ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)

PRODUCT QUALITY ASSESSMENT

SCIENCE DATA PRODUCT VALIDATION

GENERAL DOCUMENTATION

Publications Citing This Dataset

Filters
Title Year Author
Biophysical impact of sunflower crop rotation on agricultural fields Kussul, N.
A global 0.05 degrees dataset for gross primary production of sunlit and shaded vegetation canopies from 1992 to 2020 Bi, W. J.
Coupling relationship of urban development and the eco-environment in Guanzhong Region, China Wang, J.
Assessing the inundation dynamics and its impacts on habitat suitability in Poyang Lake based on integrating Landsat and MODIS observations Mu, S.
Phenological piecewise modelling is more conducive than whole-season modelling to winter wheat yield estimation based on remote sensing data Huang, X.
Recurrence plots for quantifying the vegetation indices dynamics in a semi-arid grassland Almeida-Naunay, A. F.
Changes in rice cultivation affect population trends of herons and egrets in Italy Fasola, M.
Where anthropogenic activity occurs, anthropogenic activity dominates vegetation net primary productivity change Xie, C.
Progressive spatiotemporal image fusion with deep neural networks Cai, J.
Spatiotemporal patterns and driving force of urbanization and its impact on urban ecology Zhang, M.
SHOWING 10 OF 213

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
sur_refl_b01 Surface Reflectance Band 1 (620-670 nm) N/A int16 -28672 -100 to 16000 0.0001
sur_refl_b02 Surface Reflectance Band 2 (841-876 nm) N/A int16 -28672 -100 to 16000 0.0001
sur_refl_b03 Surface Reflectance Band 3 (459-479 nm) N/A int16 -28672 -100 to 16000 0.0001
sur_refl_b04 Surface Reflectance Band 4 (545-565 nm) N/A int16 -28672 -100 to 16000 0.0001
sur_refl_b05 Surface Reflectance Band 5 (1230-1250 nm) N/A int16 -28672 -100 to 16000 0.0001
sur_refl_b06 Surface Reflectance Band 6 (1628-1652 nm) N/A int16 -28672 -100 to 16000 0.0001
sur_refl_b07 Surface Reflectance Band 7 (2105-2155 nm) N/A int16 -28672 -100 to 16000 0.0001
sur_refl_day_of_year Day of the year for the pixel Julian day uint16 65535 1 to 366 N/A
sur_refl_qc_500m Surface reflectance 500m band quality control flags Bit Field uint32 4294967295 0 to 4294966531 N/A
sur_refl_raz MODIS relative azimuth angle Degree int16 0 -18000 to 18000 0.01
sur_refl_state_500m Surface reflectance 500m state flags Bit Field uint16 65535 0 to 57343 N/A
sur_refl_szen MODIS solar zenith angle Degree int16 0 0 to 18000 0.01
sur_refl_vzen MODIS view zenith angle Degree int16 0 0 to 18000 0.01
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