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GRASP is a highly accurate aerosol retrieval algorithm that processes properties of aerosol- and land-surface-reflectance. It infers nearly 50 aerosol and surface parameters including particle size distribution, the spectral index of refraction, the degree of sphericity and absorption. The algorithm is designed for the enhanced characterization of aerosol properties from spectral, multiangular polarimetric remote sensing observations. GRASP works under different conditions, including bright surfaces such as deserts, where the reflectance overwhelms the signal of aerosols. GRASP is highly versatile and allows input from a wide variety of satellite and surface measurements.

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GRASP OPEN
GraspOpenGRASP OPEN@GraspOpen·
31 Mar

We improved POLDER/GRASP retrieval at low AOD! Check out our new POLDER-Models v2.1 archive! The ocean surface was retrieved together with aerosol over ocean and therefore the results were corrected. Many thanks to the community for their feedback, the bias issue is solved now.

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GraspOpenGRASP OPEN@GraspOpen·
28 Feb

GRASP-Open keeps maturing its tool set. Some users has experienced issues downloading the data. We have decided to reimplement our download portal. Check the new one 😉

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GraspOpenGRASP OPEN@GraspOpen·
28 Oct

New release of POLDER processing, this time using "models" approach. It is recommend to use it for AOD products because of no bias at low value (AOD<0.2).

Credit: CNES/GRASP/LOA/Catalysts/ICARE

https://www.grasp-open.com/products/polder-data-release/

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GRASP Code

Download the GRASP-code, install it and run it for a large number of different aerosol measurements. Signup for the latest version of GRASP-code: stable, fast and easy to use.

Code Documentation

Complete documentation about the code, API and features of GRASP.

GRASP is a highly accurate aerosol retrieval algorithm.

It processes properties of aerosol and land surface reflectance.

What is the GRASP Algorithm?

GRASP (Generalized Retrieval of Aerosol and Surface Properties) is the first unified algorithm to be developed for characterizing atmospheric properties gathered from a variety of remote sensing observations
(Dubovik, O. et al., 2014, GRASP: a versatile algorithm for characterizing the atmosphere, SPIE Newsroom. DOI: 10.1117/2.1201408.005558, doi: http://spie.org/x109993.xml)

What are Aerosols?

What are the sources of aerosols and what effects do they have?

Interested in GRASP Algorithm

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