MOD09Q1.061 Terra Surface Reflectance 8-Day Global 250m

AI-generated Key Takeaways

• MOD09Q1 provides surface spectral reflectance for bands 1 and 2 at 250m resolution, corrected for atmospheric conditions.

• This product includes a quality layer and selects the best pixel from an 8-day composite based on observation coverage, view angle, and cloud presence.

• Data is available from February 18, 2000, to November 24, 2024, and is provided by NASA LP DAAC at the USGS EROS Center.

• Reflectance values are provided for bands 1 (620-670nm) and 2 (841-876nm) along with quality assessment flags for data reliability.

• The data is freely available for use, sale, and redistribution with proper citation to the LP DAAC.

Dataset Availability

2000-02-18T00:00:00Z–2025-09-22T00:00:00Z

Dataset Provider

NASA LP DAAC at the USGS EROS Center

Earth Engine Snippet

ee.ImageCollection("MODIS/061/MOD09Q1")

Cadence

8 Days

Tags

8-day global mod09q1 modis nasa satellite-imagery sr surface-reflectance terra usgs

Description

The MOD09Q1 product provides an estimate of the surface spectral reflectance of bands 1 and 2 at 250m resolution and corrected for atmospheric conditions such as gasses, aerosols, and Rayleigh scattering. Along with the two reflectance bands, a quality layer is also included. For each pixel, a value is selected from all the acquisitions within the 8-day composite on the basis of high observation coverage, low view angle, the absence of clouds or cloud shadow, and aerosol loading.

Documentation:

• User's Guide

• Algorithm Theoretical Basis Document (ATBD)

• General Documentation

Bands

Pixel Size
250 meters

Bands

Name	Min	Max	Scale	Pixel Size	Wavelength	Description
sur_refl_b01	-100	16000	0.0001	meters	620-670nm	Surface reflectance band 1
sur_refl_b02	-100	16000	0.0001	meters	841-876nm	Surface reflectance for band 2
State				meters	None	Surface reflectance 250m state flags
Bitmask for State Bits 0-1: Cloud state 0: Clear 1: Cloudy 2: Mixed 3: Not set, assumed clear Bit 2: Cloud shadow 0: No 1: Yes Bits 3-5: Land/water flag 0: Shallow ocean 1: Land 2: Ocean coastlines and lake shorelines 3: Shallow inland water 4: Ephemeral water 5: Deep inland water 6: Continental/moderate ocean 7: Deep ocean Bits 6-7: Aerosol quantity 0: Climatology 1: Low 2: Average 3: High Bits 8-9: Cirrus detected 0: None 1: Small 2: Average 3: High Bit 10: Internal cloud algorithm flag 0: No cloud 1: Cloud Bit 11: Internal fire algorithm flag 0: No fire 1: Fire Bit 12: MOD35 snow/ice flag 0: No 1: Yes Bit 13: Pixel is adjacent to cloud 0: No 1: Yes Bit 14: BRDF correction performed data 0: No 1: Yes Bit 15: Internal snow mask 0: No snow 1: Snow
QA				meters	None	Surface reflectance 250m band quality control flags
Bitmask for QA Bits 0-1: MODLAND QA bits 0: Corrected product produced at ideal quality - all bands 1: Corrected product produced at less than ideal quality - some or all bands 2: Corrected product not produced due to cloud effects - all bands 3: Corrected product not produced for other reasons - some or all bands, may be fill value (11) [Note that a value of (11) overrides a value of (01)] Bits 2-3: Spare (unused) 0: N/A Bits 4-7: Band 1 data quality 0: Highest quality 7: Noisy detector 8: Dead detector, data interpolated in L1B 9: Solar zenith >= 86 degrees 10: Solar zenith >= 85 and < 86 degrees 11: Missing input 12: Internal constant used in place of climatological data for at least one atmospheric constant 13: Correction out of bounds, pixel constrained to extreme allowable value 14: L1B data faulty 15: Not processed due to deep ocean or clouds Bits 8-11: Band 2 data quality 0: Highest quality 7: Noisy detector 8: Dead detector, data interpolated in L1B 9: Solar zenith >= 86 degrees 10: Solar zenith >= 85 and < 86 degrees 11: Missing input 12: Internal constant used in place of climatological data for at least one atmospheric constant 13: Correction out of bounds, pixel constrained to extreme allowable value 14: L1B data faulty 15: Not processed due to deep ocean or clouds Bit 12: Atmospheric correction performed 0: No 1: Yes Bit 13: Adjacency correction performed 0: No 1: Yes Bit 14: Different orbit from 500m 0: No 1: Yes Bit 15: Spare (unused) 0: N/A

Terms of Use

Terms of Use

MODIS data and products acquired through the LP DAAC have no restrictions on subsequent use, sale, or redistribution.

Citations

Citations:

• Please visit LP DAAC 'Citing Our Data' page for information on citing LP DAAC datasets.

DOIs

• https://doi.org/10.5067/MODIS/MOD09Q1.061

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Code Editor (JavaScript)

var dataset = ee.ImageCollection('MODIS/061/MOD09Q1')
                  .filter(ee.Filter.date('2018-01-01', '2018-05-01'));
var falseColorVis = {
  min: -100.0,
  max: 8000.0,
  bands: ['sur_refl_b02', 'sur_refl_b02', 'sur_refl_b01'],
};
Map.setCenter(6.746, 46.529, 2);
Map.addLayer(dataset, falseColorVis, 'False Color');

Open in Code Editor

MOD09Q1.061 Terra Surface Reflectance 8-Day Global 250m

The MOD09Q1 product provides an estimate of the surface spectral reflectance of bands 1 and 2 at 250m resolution and corrected for atmospheric conditions such as gasses, aerosols, and Rayleigh scattering. Along with the two reflectance bands, a quality layer is also included. For each pixel, a value is selected …

MODIS/061/MOD09Q1, 8-day,global,mod09q1,modis,nasa,satellite-imagery,sr,surface-reflectance,terra,usgs

2000-02-18T00:00:00Z/2025-09-22T00:00:00Z

-90 -180 90 180

Google Earth Engine

https://developers.google.com/earth-engine/datasets

• https://doi.org/10.5067/MODIS/MOD09Q1.061
• https://doi.org/10.5067/MODIS/MOD09Q1.061