Google Earth Engine ——MODIS/006/MYD09GQ表面反射率产品提供了在没有大气散射或吸收的情况下在地面测量的表面光谱反射率的估计。低层数据经过大气气体和气溶胶的校正。

2024-02-02 11:07:32 浏览数 (2)

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. MYD09GQ version 6 provides bands 1 and 2 at a 250m resolution in a daily gridded L2G product in the Sinusoidal projection, including a QC and five observation layers. This product is meant to be used in conjunction with the MOD09GA where important quality and viewing geometry information is stored.

Documentation:

  • User's Guide
  • Algorithm Theoretical Basis Document (ATBD)
  • General Documentation

MODIS表面反射率产品提供了在没有大气散射或吸收的情况下在地面测量的表面光谱反射率的估计。低层数据经过大气气体和气溶胶的校正。MYD09GQ第6版在正弦波投影的每日网格化L2G产品中，以250米的分辨率提供波段1和2，包括一个质量控制层和五个观测层。该产品旨在与MOD09GA一起使用，其中存储了重要的质量和观测几何信息。

Dataset Availability

2002-07-04T00:00:00 - 2021-09-21T00:00:00

Dataset Provider

NASA LP DAAC at the USGS EROS Center

Collection Snippet

Copied

ee.ImageCollection("MODIS/006/MYD09GQ")

使用说明：

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

数据引用：

LP DAAC - MYD09GQ

Resolution

250 meters

Bands Table

Name

Description

Min

Max

Wavelength

Scale

num_observations

Number of observations per 250m pixel

0

127

0

sur_refl_b01

Surface reflectance band 1

-100

16000

620-670nm

0.0001

sur_refl_b02

Surface reflectance for band 2

-100

16000

841-876nm

0.0001

QC_250m

Surface reflectance quality assurance

0

QC_250m Bitmask

Bits 0-1: MODLAND QA bits 0: Corrected product produced at ideal quality - all bands1: Corrected product produced at less than ideal quality - some or all bands2: Corrected product not produced due to cloud effects - all bands3: 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/ABits 4-7: Band 1 data quality 0: Highest quality7: Noisy detector8: Dead detector, data interpolated in L1B9: Solar zenith ≥ 86 degrees10: Solar zenith ≥ 85 and < 86 degrees11: Missing input12: Internal constant used in place of climatological data for at least one atmospheric constant13: Correction out of bounds, pixel constrained to extreme allowable value14: L1B data faulty15: Not processed due to deep ocean or cloudsBits 8-11: Band 2 data quality 0: Highest quality7: Noisy detector8: Dead detector, data interpolated in L1B9: Solar zenith ≥ 86 degrees10: Solar zenith ≥ 85 and < 86 degrees11: Missing input12: Internal constant used in place of climatological data for at least one atmospheric constant13: Correction out of bounds, pixel constrained to extreme allowable value14: L1B data faulty15: Not processed due to deep ocean or cloudsBit 12: Atmospheric correction performed 0: No1: YesBit 13: Adjacency correction performed 0: No1: YesBits 14-15: Spare (unused) 0: N/A

obscov

Observation coverage percent

0

100

0.01

iobs_res

Observation number

0

254

0

orbit_pnt

Orbit pointer

0

15

0

granule_pnt

Granule pointer

0

254

0

  • 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
  • Bits 14-15: Spare (unused)
    • 0: N/A

obscovObservation coverage percent01000.01iobs_resObservation number02540orbit_pntOrbit pointer0150granule_pntGranule pointer02540

代码：

代码语言：javascript复制
var dataset = ee.ImageCollection('MODIS/006/MYD09GQ')
                  .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');
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