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Data and images displayed on STAR sites are provided for experimental use only and are not official operational NOAA products. More information>>

The gridded data dispayed on and available from this page are generated from the official, operational VIIRS AOT EDR.

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STAR / SMCD / VIIRS Aerosol Calibration and Validation

SNPP/VIIRS (EPS) Aerosol Products - Gridded Data

The daily operational VIIRS 550-nm AOD Environmental Data Record (EDR) at nominal 750m resolution are gridded on a regular 0.25 x 0.25-degree equal angle (~28x28 km at the equator) grid. The gridding process uses only high quality AOD EDRs.

The 0.25x0.25-degree gridded AOD for a given day (since 07/21/2017) can be displayed on the map below by selecting the year, month and day of interest, and by clicking the "Submit" button. Use the buttons "Day-1" and "Day+1" to step back and forward by one day, respectively. Use the "Latest" button to come back to the latest available day.

Daily files of gridded data (in compressed binary or NetCDF file format) since 07/21/2017 can be downloaded from the STAR The latency for gridded data and images is one day.

0.25x0.25-degree Gridded Aerosol Optical Depth at 550 nm SNPP/VIIRS - EPS Valid date range: from 07/21/2017 to current-1 day
Date Selector Year: Month: Day:	Date Control	Data Access FTP

0.25x0.25-degree Gridded Aerosol Optical Depth at 550 nm

SNPP/VIIRS - EPS

Valid date range: from 07/21/2017 to current-1 day

Date Selector Year: Month: Day:

Date Control

Data Access FTP

AOD EDR Gridding Processes

Each EDR pixel is associated with geolocation data (LAT, LON) that describes the center of the pixel. For each grid box (i,j), if (LAT, LON) falls within the boundary of a grid box then this AOD EDR is counted toward the Mean AOD computation of that grid box (i,j). The grid-box value of the AOD is the arithmetic average of all AOD EDRs falling into the grid box. More information is in the ReadMe file.

(Hover over the acronyms to see their definition.)

Software

Python scripts for working with VIIRS gridded aerosol data are provided to download data files from the STAR anonymous FTP site and process and visualize the data on a map.