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Google Earth Engine ——MCD19A2 V6数据产品是MODIS Terra和Aqua结合的大气校正多角度实施(MAIAC)陆地气溶胶光学深度(AOD)网格化2级产品,1公里分辨率

The MCD19A2 V6 data product is a MODIS Terra and Aqua combined Multi-angle Implementation of Atmospheric Correction (MAIAC) Land Aerosol Optical Depth (AOD) gridded Level 2 product produced daily at 1 km resolution. For more information see the ​​MAIAC user guide​​.

Documentation:

  • ​​User's Guide​​
  • ​​Algorithm Theoretical Basis Document (ATBD)​​
  • ​​General DocumentationGoogle Earth Engine ——MCD19A2 V6数据产品是MODIS Terra和Aqua结合的大气校正多角度实施(MAIAC)陆地气溶胶光学深度(AOD)网格化2级产品,1公里分辨率_AODhttps://ladsweb.modaps.eosdis.nasa.gov/filespec/MODIS/6/MCD19A2​​

MCD19A2 V6数据产品是MODIS Terra和Aqua结合的大气校正多角度实施(MAIAC)陆地气溶胶光学深度(AOD)网格化2级产品,每天以1公里分辨率制作。更多信息见MAIAC用户指南。

文件。

用户指南

算法理论基础文件(ATBD)

一般文件

Dataset Availability

2000-02-01T00:00:00 - 2021-09-19T00:00:00

Dataset Provider

​​NASA LP DAAC at the USGS EROS Center​​

Collection Snippet

​ee.ImageCollection("MODIS/006/MCD19A2_GRANULES")​

Resolution

1000 meters

Bands Table

Name

Description

Min

Max

Units

Scale

Optical_Depth_047

Blue band (0.47 μm) aerosol optical depth over land

-100

5000

0.001

Optical_Depth_055

Green band (0.55 μm) aerosol optical depth over land

-100

5000

0.001

AOD_Uncertainty

AOD uncertainty based on blue-band surface brightness (reflectance)

-100

30000

0.0001

FineModeFraction

Fine mode fraction for ocean

0

10000

0.0001

Column_WV

Column water vapor over land

0

30000

cm

0.001

AOD_QA

AOD QA

0

AOD_QA Bitmask



  • Bits 0-2: Cloud mask
  • 0: Undefined
  • 1: Clear
  • 2: Possibly cloudy (detected by AOD filter)
  • 3: Cloudy (detected by cloud mask algorithm)
  • 5: Cloud shadow
  • 6: Hot spot of fire
  • 7: Water sediments
  • Bits 3-4: Land water snow/ice mask
  • 0: Land
  • 1: Water
  • 2: Snow
  • 3: Ice
  • Bits 5-7: Adjacency mask
  • 0: Normal condition/Clear
  • 1: Adjacent to clouds
  • 2: Surrounded by more than 8 cloudy pixels
  • 3: Adjacent to a single cloudy pixel
  • 4: Adjacent to snow
  • 5: Snow was previously detected in this pixel
  • Bits 8-11: QA for AOD
  • 0: Best quality
  • 1: Water Sediments are detected (water)
  • 3: There is 1 neighbor cloud
  • 4: There is >1 neighbor clouds
  • 5: No retrieval (cloudy, or whatever)
  • 6: No retrievals near detected or previously detected snow
  • 7: Climatology AOD - altitude above 3.5km (water) and 4.2km (land)
  • 8: No retrieval due to sun glint (water)
  • 9: Retrieved AOD is very low (<0.05) due to glint (water)
  • 10: AOD within +-2km from the coastline (may be unreliable)
  • 11: Land, research quality - AOD retrieved but CM is possibly cloudy
  • Bit 12: Glint mask
  • 0: No glint
  • 1: Glint (glint angle < 40°)
  • Bits 13-14: Aerosol model
  • 0: Background model (regional)
  • 1: Smoke model (regional)
  • 2: Dust model
  • Bit 15: Reserved
  • 0: Reserved for future use
  • 1: Reserved for future use

AOD_MODEL

AOD model used in retrieval

0

100

0

Injection_Height

Smoke injection height

0

10000

m

0

cosSZA

Cosine of solar zenith angle (5 km resolution)

0

10000

0.0001

cosVZA

Cosine view zenith angle (5 km resolution)

0

10000

0.0001

RelAZ

Relative azimuth angle (5 km resolution)

-18000

18000

0.01

Scattering_Angle

Scattering angle (5 km resolution)

-18000

18000

0.01

Glint_Angle

Glint angle (5 km resolution)

-18000

18000

0.01

 使用说明:

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

通过LP DAAC获得的MODIS数据和产品对后续使用、销售或再分配没有限制。

引用:

​​LP DAAC - MCD12Q1LP DAAC - Land Processes Distributed Active Archive Center - Sioux Falls, SDhttps://doi.org/10.5067/MODIS/MCD12Q1.006​​

代码:

var collection = ee.ImageCollection('MODIS/006/MCD19A2_GRANULES')
.select('Optical_Depth_047')
.filterDate('2019-01-01', '2019-01-15');

var band_viz = {
min: 0,
max: 500,
palette: ['black', 'blue', 'purple', 'cyan', 'green', 'yellow', 'red']
};

Map.addLayer(collection.mean(), band_viz, 'Optical Depth 047');
Map.setCenter(76, 13, 6);

Google Earth Engine ——MCD19A2 V6数据产品是MODIS Terra和Aqua结合的大气校正多角度实施(MAIAC)陆地气溶胶光学深度(AOD)网格化2级产品,1公里分辨率_数据集_02

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