MCD19A2.061: Terra & Aqua MAIAC Land Aerosol Optical Depth Daily 1km

AI-generated Key Takeaways

The MCD19A2 V6.1 data product provides daily 1 km resolution land aerosol optical depth data from MODIS Terra and Aqua.
The dataset is available from February 24, 2000, to October 12, 2025, and is provided by NASA LP DAAC at the USGS EROS Center.
Key bands in the dataset include Aerosol Optical Depth at 0.47 μm and 0.55 μm, AOD Uncertainty, Fine Mode Fraction, and Column Water Vapor.
MODIS data and products from LP DAAC have no restrictions on subsequent use, sale, or redistribution.
The dataset can be explored and analyzed using the Google Earth Engine platform.

Dataset Availability: 2000-02-24T00:00:00Z–2025-11-14T23:15:00Z
Dataset Provider: NASA LP DAAC at the USGS EROS Center

Cadence: 1 Day
Tags: aerosol aod aqua atmosphere daily global maiac modis nasa terra usgs
mcd19a2

Description

The MCD19A2 V6.1 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 .

NOTE: This product has been released with the caveat that the reprocessing for the full mission is expected to continue through summer 2023.

Bands

Pixel Size 1000 meters

Bands

Name

Units

Min

Max

Scale

Pixel Size

Description

Optical_Depth_047

-100

8000

0.001

meters

Aerosol optical depth over land retrieved in the MODIS Blue band (0.47 μm). AOD is not received at high altitude (greater than 4.2 km) except when smoke or dust is detected; rather, we report a static value of 0.02 used for atmospheric correction.

Optical_Depth_055

-100

8000

0.001

meters

Aerosol optical depth over land retrieved in the MODIS Green band (0.55 μm).

AOD_Uncertainty

30000

0.0001

meters

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

FineModeFraction

1000

meters

Fine mode fraction for ocean and large inland lakes

Column_WV

30000

0.001

meters

Column water vapor over land, retrieved from MODIS near-IR bands at 0.94 μm. When reported for cloudy pixels, it represents water vapor above the cloud.

AOD_QA

meters

AOD QA

Bitmask for AOD_QA

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 4 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 is replaced by nearby AOD
- 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

Injection_Height

10000

meters

Smoke injection height

AngstromExp_470-780

0.0001

meters

Angstrom exponent 470-780nm over the ocean

cosSZA

10000

0.0001

meters

Cosine of solar zenith angle (5 km resolution)

cosVZA

10000

0.0001

meters

Cosine view zenith angle (5 km resolution)

RelAZ

-18000

18000

0.01

meters

Relative azimuth angle (5 km resolution)

Scattering_Angle

-18000

18000

0.01

meters

Scattering angle (5 km resolution)

Glint_Angle

-18000

18000

0.01

meters

Glint angle (5 km resolution)

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

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

DOIs

https://doi.org/10.5067/MODIS/MCD19A2.061

Explore with Earth Engine

Code Editor (JavaScript)

 var 
  
 collection 
  
 = 
  
 ee 
 . 
 ImageCollection 
 ( 
 'MODIS/061/MCD19A2_GRANULES' 
 ) 
  
 . 
 select 
 ( 
 'Optical_Depth_047' 
 ) 
  
 . 
 filterDate 
 ( 
 '2023-01-01' 
 , 
  
 '2023-01-15' 
 ); 
 var 
  
 band_viz 
  
 = 
  
 { 
  
 min 
 : 
  
 0 
 , 
  
 max 
 : 
  
 1100 
 , 
  
 palette 
 : 
  
 [ 
 'black' 
 , 
  
 'blue' 
 , 
  
 'purple' 
 , 
  
 'cyan' 
 , 
  
 'green' 
 , 
  
 'yellow' 
 , 
  
 'red' 
 ] 
 }; 
 Map 
 . 
 addLayer 
 ( 
 collection 
 . 
 mean 
 (), 
  
 band_viz 
 , 
  
 'Optical Depth 047' 
 ); 
 Map 
 . 
 setCenter 
 ( 
 76 
 , 
  
 13 
 , 
  
 6 
 );

Open in Code Editor

MCD19A2.061: Terra & Aqua MAIAC Land Aerosol Optical Depth Daily 1km

MODIS/061/MCD19A2_GRANULES, aerosol,aod,aqua,atmosphere,daily,global,maiac,modis,nasa,terra,usgs

2000-02-24T00:00:00Z/2025-11-14T23:15:00Z

-90 -180 90 180

Google Earth Engine

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

MCD19A2.061: Terra & Aqua MAIAC Land Aerosol Optical Depth Daily 1km Stay organized with collections Save and categorize content based on your preferences.

AI-generated Key Takeaways

Description

Bands

Terms of Use

Citations

DOIs

Explore with Earth Engine

Code Editor (JavaScript)

MCD19A2.061: Terra & Aqua MAIAC Land Aerosol Optical Depth Daily 1km