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# GRASP Open

Platform for GRASP algorithm development

## Pages

- [GRASP OPEN](https://www.grasp-open.com/) - GRASP open official webpage
- [GRASP OPEN](https://www.grasp-open.com/) - GRASP open official webpage
- [Publications](https://www.grasp-open.com/publications-2/) - The list of publications about GRASP code and its applications
- [GRASP Labs](https://www.grasp-open.com/labs/) - Examples of successful applications of GRASP code
- [GRASP-SYNERGY Summer School 2026](https://www.grasp-open.com/grasp-synergy-summer-school-2026/) - GRASP-SYNERGY Summer School 29-30 June 2026 in Valladolid
- [MERIS Data Release](https://www.grasp-open.com/products/meris-data-release/) - Download MERIS dataDOWNLOADVisualizeIntroductionArchive structureFile descriptionDownload instructionsResults and validationKnown BugsIntroduction MERIS (MEdium Resolution Imaging Spectrometer) is an imaging spectrometer operating from Envisat satellite platform in the solar reflective spectral range. Fifteen spectral bands can be selected by ground command. The instrument scans the Earth’s surface by the so called “push-broom” method. Linear CCD arrays provide spatial sampling
- [TROPOMI Data Release](https://www.grasp-open.com/products/tropomi-data-release/) - Download TROPOMI dataDOWNLOADVisualizeIntroductionArchive structureFile descriptionDownload instructionsKnown BugsIntroduction TROPOMI/Sentinel-5p Instrument Tropospheric Monitoring Instrument (TROPOMI) aboard the Sentinel-5 Precursor (S5p) satellite was launched on 13 October 2017. TROPOMI instrument provides hyperspectral measurements in ultraviolet (UV), visible (VIS), near (NIR) and shortwave (SWIR) infrared spectral range. Though the main purpose of the instrument is trace gas characterization, it
- [OLCI Data Release](https://www.grasp-open.com/products/olci-data-release/) - Download OLCI dataDOWNLOADVisualizeIntroductionArchive structureFile descriptionDownload instructionsKnown BugsIntroduction OLCI/Sentinel-3A Instrument The Ocean and Land Color Instrument (OLCI) onboard the Sentinel-3A satellite is a medium-resolution and multi-spectral imager. The OLCI instrument is the follow-on mission to the Medium Resolution Imaging Spectrometer (MERIS) instrument flown on Envisat. The Sentinel-3A is on a near-polar, sun-synchronous orbit with a descending
- [POLDER Data Release](https://www.grasp-open.com/products/polder-data-release/) - Download POLDER dataDOWNLOADVisualizeIntroductionArchive structureFile descriptionDownload instructionsResults and validationKnown BugsIntroduction POLDER I-II and POLDER/PARASOL instruments The POLDER instruments consist of a digital camera with a 274×242-pixel CCD detector array, wide-field telecentric optics and a rotating filter wheel enabling measurements in 9 spectral channels with bandwidths between 20nm and 40nm. Because it acquires a sequence of images
- [Summer school 2019](https://www.grasp-open.com/summer-school-2019/) - GRASP-ACE summer school 27-31 May 2019 in Granada
- [ENVISAT Data Release](https://www.grasp-open.com/products/envisat-data-release/) - Download ENVISAT dataDOWNLOADIntroductionArchive structureFile descriptionDownload instructionsResults and validationKnown BugsIntroduction MERIS (MEdium Resolution Imaging Spectrometer) is an imaging spectrometer operating from Envisat satellite platform in the solar reflective spectral range. Fifteen spectral bands can be selected by ground command. The instrument scans the Earth’s surface by the so called “push-broom” method. Linear CCD arrays provide spatial
- [Spheroid-package Release](https://www.grasp-open.com/products/spheroid-package-release/) - Download Spheroid-packageDOWNLOADDescriptionDownload instructionsKnown BugsDescription The presented package and the below description largely relay on the study of Dubovik et al., [2006]. Spheroids (ellipsoids of revolution) is the simplest non-spherical shape, which is widely employed for modeling light scattering by non-spherical aerosol. Specifically, Mishchenko et al. [1997] showed that a mixture of randomly oriented spheroids with
- [Products](https://www.grasp-open.com/products/) - Examples of successful applications of GRASP code
- [AOD Inversion](https://www.grasp-open.com/products/aod-inversion/) - This application allows retrieval of aerosol properties from AOD measurements with a variable spectral range based on the published work of Torres et al., 2017. The application is limited of having at least one AOD-measurement between 500-800nm, one under 500nm and another one above 800nm. The refractive index, real and imaginary part, should be given
- [POLDER I-II Data Release](https://www.grasp-open.com/products/polder-i-ii-data-release/) - Download POLDER dataDOWNLOADIntroductionArchive structureFile descriptionDownload instructionsResults and validationKnown BugsIntroduction POLDER I-II and POLDER/PARASOL instruments The POLDER instruments consist of a digital camera with a 274×242-pixel CCD detector array, wide-field telecentric optics and a rotating filter wheel enabling measurements in 9 spectral channels with bandwidths between 20nm and 40nm. Because it acquires a sequence of images
- [POLDER Products (Optimized Settings)](https://www.grasp-open.com/products/polder-optimized/)
- [GROSAT Data Release](https://www.grasp-open.com/products/grosat-data-release/) - Download GROSAT dataDOWNLOADIntroductionArchive structureFile descriptionDownload instructionsKnown limitationsIntroduction GROSAT Synergetic approach In the framework of ESA “Synergetic retrieval from Ground-based and Satellites measurements: new possibilities for surface characterization and validation” (GROSAT) project (https://www.grasp-sas.com/projects/grosat/), a simultaneous synergistic retrieval of aerosol and surface properties approach (GRASP/GROSAT approach) is developed using combined ground-based AERONET and satellite measurements. In such
- [GROSAT Products](https://www.grasp-open.com/products/access-request-meris-2/)
- [TROPOMI Products](https://www.grasp-open.com/products/access-request-tropomi/)
- [OLCI Products](https://www.grasp-open.com/products/access-request-olci/)
- [Contact](https://www.grasp-open.com/contact/) - Contact Info UFR de Physique - Bâtiment P5, Université de Lille - Cité Scientifique 59655, Villeneuve d'Ascq Cedex, France+33 320 436 610 / +33 667 027 316+33 320 434 342office@grasp-sas.com Follow us FacebookTwitterYouTube Get in Touch with Us Just to prove you are a human, please solve the equation: 25 - 5 = ? Send
- [GRASP License](https://www.grasp-open.com/grasp-license/) - GRASP Open Source License V1.0 Copyright (c) < CNRS & Université de Lille > All rights reserved. The GRASP software has been registered with the Software Protection Agency: N°IDDN.FR.001.490016.000.S.P.2015.000.31235 GRASP (Generalized Retrieval of Atmosphere and Surface Properties) version 1.0 dated 9 April 2015 GRASP SAS manages the software license under agreement with CNRS &
- [MERIS Products](https://www.grasp-open.com/products/access-request-meris/)
- [Spheroid Package](https://www.grasp-open.com/products/spheroid-package/) - [vc_actionbox type=”custom” bg_color=”#f18821″ text_color=”#ffffff” title=”Download spheroid package” button1=”DOWNLOAD” link1=”https://code.grasp-open.com/open/spheroid-package” size1=”small” target1=”_blank”] Introduction Archive Structure How to download Click to the ‘Download’ button above. Sign in or register to get access to GRASP open code. On Spheroid package page click on download icon as shown in screenshot below. Select preferred archive type. Code compilation and execution
- [products-copy](https://www.grasp-open.com/products-copy/) - Products [vc_actionbox type=”custom” bg_color=”#f18821″ text_color=”#ffffff” title=”GRASP Open Code” message=”The code is open for all users with scientific purposes. Let’s start using GRASP algorithm by your own!” button1=”GITLAB REPOSITORY” link1=”https://access-request.grasp-cloud.com/service/gitlab” size1=”big”] POLDER/PARASOL GRASP algorithm has been applied to entire archive (~ 9 years) of French Space Agency’s PARASOL/POLDER instrument obtaining wide variety of aerosol and surface
- [GRASP OPEN copy](https://www.grasp-open.com/grasp-open-copy/) - Platform for GRASP open source code Get public access to the code, documentation and user assistance Text on the button [vc_actionbox type=”alternate” title=” ” message=”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
- [Search](https://www.grasp-open.com/search/)
- [Legal Statement](https://www.grasp-open.com/legal-statement/) - AddressGRASP SAS, 20, Impasse de l’Eglise, Bachy, 59830, France Emailoffice@grasp-sas.com Phone/Fax+33 667027316 / +33 320434342 VATFR33 809550270 Google Analytics This website uses Google Analytics, a web analytics service provided by Google, Inc. (“Google”). Google Analytics uses “cookies”, which are text files placed on your computer, to help the website analyze how users use the site.

## Portfolio

- [Single Project](https://www.grasp-open.com/portfolio/project/) - Project Description Morbi sagittis, sem quis lacinia faucibus, orci ipsum gravida tortor, vel interdum mi sapien ut justo. Nulla varius consequat magna, id molestie ipsum volutpat quis. Suspendisse consectetur fringilla luctus. Fusce id mi diam, non ornare orci. Pellentesque ipsum erat, facilisis ut venenatis eu, sodales vel dolor. Project Detail Client: ThemeForest Date: April 16,
- [Single Project - Full Slider](https://www.grasp-open.com/portfolio/project-slider/) - [vc_simple_slider ids=”3540,3541,3542″ type=”1″ arrows=”always” nav=”none” transition=”slide”] Business solutions Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes. Etiam facilisis venenatis libero, ac fermentum dolor euismod in. Client: ThemeForest Date: April 16, 2013 Project URL: www.yoursite.com More Info SummaryExtended InfoAdditional Few Things
- [Single Project - 2/3 Slider](https://www.grasp-open.com/portfolio/project-slider-23/) - [vc_simple_slider ids=”3540,3541,3542″ type=”1″] Project Info Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes. Project Goal Our Task: lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis
- [Single Project - Full Video](https://www.grasp-open.com/portfolio/project-video/) - Project Info Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Client: ThemeForest Date: April 16, 2013 Project URL: www.yoursite.com SummaryAdditional Info Skills: Photoshop, Illustration, Photography Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi sagittis, sem quis lacinia faucibus, orci ipsum gravida tortor, vel interdum mi sapien ut justo. Nulla varius consequat magna,
- [Single Project - 2/3 Image](https://www.grasp-open.com/portfolio/project-image-23/) - Project Info Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes. Text on the button Client: ThemeForest Date: April 16, 2013 Skills: HTML5, CSS3, JavScript Project URL: www.yoursite.com Decscription Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium
- [Nature Photography](https://www.grasp-open.com/portfolio/nature-photography/) - [vc_simple_slider ids=”3540,3541,3542″ type=”1″] Wonderful Nature Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium,
- [Single Project - 2/3 Video](https://www.grasp-open.com/portfolio/project-video-23/) - Project Info Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta
- [Single Project - Mosaic Images](https://www.grasp-open.com/portfolio/mosaic-images/) - Wonderful Nature Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam,
- [Single Project - Another Slider](https://www.grasp-open.com/portfolio/project-slider-alt/) - [vc_simple_slider ids=”3540,3541,3542″ type=”0″ auto_rotation=”yes” arrows=”always” nav=”none” transition=”slide”] Business solutions Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes. Etiam facilisis venenatis libero, ac fermentum dolor euismod in. Client: ThemeForest Date: April 16, 2013 Project URL: www.yoursite.com Summary Lorem ipsum dolor
- [Single Project - Extended](https://www.grasp-open.com/portfolio/project-extended/) - [rev_slider_vc alias=”portfolio_slider”] THIS IS OUR PROJECT Etiam facilisis venenatis libero, ac fermentum dolor euismod in. Phasellus placerat egestas varius. Vivamus eleifend at massa sodales faucibus. Vestibulum egestas nibh in turpis volutpat ornare. Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Nulla consequat massa quis enim. Donec pede justo, fringilla vel,
- [Single Project - Gallery](https://www.grasp-open.com/portfolio/project-gallery/) - Imagination is more important than knowledge Etiam facilisis venenatis libero, ac fermentum dolor euismod in. Phasellus placerat egestas varius. Vivamus eleifend at massa sodales faucibus. Vestibulum egestas nibh in turpis volutpat ornare. Ut tempor lacinia purus, ac gravida tortor suscipit eget. Maecenas id mi ac sapien ornare imperdiet. Nullam et faucibus urna, at bibendum ante.
- [Another Full Width Slider Project](https://www.grasp-open.com/portfolio/project-alt/) - [vc_simple_slider ids=”3540,3541,3542″ type=”0″ arrows=”hover” nav=”dots” transition=”slide” auto_rotation=”yes” fullscreen=”yes” stretch=”yes”] Project Description Morbi sagittis, sem quis lacinia faucibus, orci ipsum gravida tortor, vel interdum mi sapien ut justo. Nulla varius consequat magna, id molestie ipsum volutpat quis. Suspendisse consectetur fringilla luctus. Fusce id mi diam, non ornare orci. Pellentesque ipsum erat, facilisis ut venenatis eu, sodales
- [Single Project - Lightbox Image](https://www.grasp-open.com/portfolio/single-project-lightbox-image/) - There is no content because "Open Portfolio Image in Lightbox" option is enabled.
- [Custom Project Link](https://www.grasp-open.com/portfolio/custom-project-link/) - There is no content because "Custom Project Link" is enabled.
- [Custom Project Link openning in a new tab (window)](https://www.grasp-open.com/portfolio/custom-project-link-openning-in-a-new-tab-window/) - There is no content because "Custom Project Link" is enabled.

## Portfolio Categories

- [Custom](https://www.grasp-open.com/portfolio_category/custom/)
- [Illustration](https://www.grasp-open.com/portfolio_category/illustration/)
- [Photography](https://www.grasp-open.com/portfolio_category/photography/)
- [Video](https://www.grasp-open.com/portfolio_category/video-2/)
- [Web design](https://www.grasp-open.com/portfolio_category/web-design-2/)