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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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GraspOpenGRASP OPEN@GraspOpen·
15 Jun

New paper discussing temporal and spatial characteristics of black and brown carbon from POLDER/GRASP retrievals:
https://www.sciencedirect.com/science/article/abs/pii/S0034425720302832?via%3Dihub

#blackcarbon #browncarbon #satelliteremotesensing #POLDER #PARASOL #GRASP

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GraspOpenGRASP OPEN@GraspOpen·
24 May

24th of May! Such a great day! We are happy to announce that GRASP v1.0.0 is out! Just after 5 years of the first public release of the code! Check it out here: https://www.grasp-open.com/products/

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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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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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