The Multi-sensor Aerosol Products Sampling System
) enables comparative analysis of aerosol retrievals from multiple spaceborne sensors, including (see below for instrument acronym table) MODIS-Terra and MODIS-Aqua, MISR, OMI, POLDER, CALIOP, SeaWiFS, and VIIRS – based on collocating these spaceborne data with ground-based aerosol observations from the Aerosol Robotic Network (AERONET) stations. However, exploring and reporting numerous statistical results generated by MAPSS analysis over a broad range of sensors and hundreds of AERONET stations is not trivial, and pushes the boundaries of what is possible within the framework of traditional academic publications.
With this challenge in mind, we have developed the MAPSS Explorer
Web interface tool. The tool enables interactive exploration of the statistical results from MAPSS for the coherent analysis of uncertainty in spaceborne aerosol retrievals over AERONET and other ground stations. All aerosol ground sites are displayed on a Google map. By clicking a given site, a panel pops up showing the values of an uncertainty parameter (e.g., R2
, slope, offset, mean negative and positive deviations, and root mean square (rms) error) for all sensors compared to AERONET. Options include comparisons in different seasons, with or without quality analysis (QA) filtering, and including or excluding distinct outliers. In addition to the statistics presented in this panel, a user may request the tool to produce a scatter plot, a time-series plot, or a relevant data file, enabling further exploration of uncertainties that might exist in spaceborne retrievals corresponding to a given site.
In the example MAPSS Explorer screenshot below, a circular diagram shows coefficients of determination (R2) of the linear least squares regression fits of each sensor aerosol optical depth (AOD) against that of the Goddard Space Flight Center (GSFC) AERONET station located in Greenbelt, Maryland. Colors and symbols are explained below the map. The bottom right circular chart shows the average correlation (R2) values based on all AERONET stations globally.
· Petrenko, M., and C. Ichoku (2013) Coherent uncertainty analysis of aerosol measurements from multiple satellite sensors. Atmospheric Chemistry and Physics, 13(14), 6777–6805, doi:10.5194/acp-13-6777-2013.
· Petrenko, M., C. Ichoku, and G. Leptoukh (2012). Multi-sensor Aerosol Products Sampling System (MAPSS). Atmospheric Measurement Techniques, 5(5), 913–926, doi:10.5194/amt-5-913-2012.
· MODIS – Moderate Resolution Imaging Spectroradiometer
· MISR – Multi-angle Imaging SpectroRadiometer
· OMI – Ozone Measuring Instrument
· POLDER – Polarization and Directionality of the Earth's Reflectances
· CALIOP – Cloud-Aerosol Lidar with Orthogonal Polarization
· VIIRS – Visible/Infrared Imager and Radiometer Suite
· SeaWiFS – Sea-viewing Wide Field-of-view Sensor