MYD09Q1.061 Aqua Surface Reflectance 8-Day Global 250m

MODIS/061/MYD09Q1
Dataset Availability
2002-07-04T00:00:00Z–2025-03-14T00:00:00Z
Dataset Provider
Earth Engine Snippet
ee.ImageCollection("MODIS/061/MYD09Q1")
Cadence
8 Days
Tags
8-day aqua global modis nasa satellite-imagery sr surface-reflectance usgs
myd09q1
DescriptionBandsTerms of UseCitationsDOIs

The MYD09Q1 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:

Pixel Size
250 meters

Bands

Name Min Max Scale Wavelength Description
sur_refl_b01 -100 16000 0.0001 620-670nm

Surface reflectance band 1
sur_refl_b02 -100 16000 0.0001 841-876nm

Surface reflectance for band 2
State

Surface reflectance 250m state flags
  • 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

Surface reflectance 250m band quality control flags
  • 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

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

Citations:

Explore with Earth Engine

Code Editor (JavaScript)
var dataset = ee.ImageCollection('MODIS/061/MYD09Q1')
                  .filter(ee.Filter.date('2018-01-01', '2018-05-01'));

var falseColorVis = {
  min: -100.0,
  max: 6000.0,
  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
The MYD09Q1 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/MYD09Q1, 8-day,aqua,global,modis,nasa,satellite-imagery,sr,surface-reflectance,usgs
2002-07-04T00:00:00Z/2025-03-14T00:00:00Z
-90 -180 90 180
Google Earth Engine