Hi Mohamed, Indeed it is possible that some reflectances are negative. The output of Polymer is not directly the output of the water reflectance model. The final water reflectance is recalculated from the observed spectrum by subtracting the atmospheric path reflectance (eq 10 of Steinmetz et al 201...

Polymer v4.9 is available.

By downloading Polymer you agree to the licence terms and conditions.

This version updates OLCI vicarious calibration gains, and adds a reader to process HICO data (experimental). See more details in the changelog.

We have published a paper describing the Smart-G code.

The paper is available at this address: https://doi.org/10.1016/j.jqsrt.2018.10.017

Dear Ge, If you use landmask=None , there is no landmask applied at all, Polymer will run also over land pixels. With landmask="default" , it uses the landmask embedded in OLCI Level1, but this will mask out inland waters. The last option, landmask=GSW() , uses an external land mask (JRC global surf...

Smart-G v0.9.1 is available. By downloading the software, you agree to the licence terms and conditions . This version has the following changelog: * Add compilation support for additional architectures, including GeForce 20xx series (Turing). * Fix OPAC phase function interpolation * Add aerosol a...

Smart-G v0.9 is available. By downloading the software, you agree to the licence terms and conditions . The software is available as python source code and cuda kernels in binary form. Information about the installation can be found in README.md. This is the first public release, please consider it...

SMART-G ( Speed-Up Monte Carlo Advanced Radiative Transfer using GPU ) is an advanced radiative transfer code. Initially co-developed by HYGEOS for CNES to simulate how the light propagates in the atmosphere and ocean, SMART-G is now continuously upgraded by HYGEOS. Features: Monte Carlo solver Acco...

Polymer v4.8 is available.

By downloading Polymer you agree to the licence terms and conditions.

The complete changelog is available at this address

Polymer is an atmospheric correction algorithm developed by Hygeos, aimed at recovering the radiance scattered and absorbed by the oceanic waters (also called Ocean Colour) from the signal measured by satellite sensors in the visible spectrum. It has been applied to multiple sensors from ESA (MERIS/...