PlanarRad is a freely available open-source C++ implementation of the invariant imbedded numerical integration technique for calculating radiative transfer in plane-parallel shallow-water environments, i.e. where the substrate reflectance and water column optical properties can be assumed horizontally homogenous. The solution algorithm follows almost exactly the formulation described in the book Light and Water by Curt Mobley, and is therefore capable of calculating angular radiance through the water column, and above-water reflectances, based on the Inherent Optical Properties (IOPs) of the water. PlanarRad is intended primarily as an instructive teaching aid for hydrological optics, and as such comes with a variety of visualisation outputs built-in. Multiple model runs and actual data from underwater profiling spectroradiometers can be directly compared in the visualisation tools provided, to examine model sensitivity to input parameters or for model closure experiments.
PlanarRad automatically handles spectral resampling to simplify combining data from multiple instruments. The software is therefore ideal for use with the FSF suite of aquatic instrumentation, and integrates with the WLTool software for extacting data from the WETLabs DH4 data logger. In addition to the graphical front-end a set of command line tools facilitate model runs from scripts, allowing automated multiple runs for construction of remote sensing reflectance look-up tables for example. PlanarRad was developed by Dr. John Hedley supported by three NERC funded projects held at Exeter University and from the World Bank/GEF Coral Reef Targeted Research Program. Contact Mr Alasdair MacArthur at FSF for further details. The PlanarRad source code also includes the source code to WLTool. PlanarRad is provided without support, but technical queries and other comments can be emailed to the FSF or to Dr. J. Hedley directly. The WLTool web page can be accessed from here.
Disclaimer. By providing these resources to the user community neither the Field Spectroscopy Facility nor the authors take any responsibility for the use of the software or any other resources provided on this webpage. While all reasonable steps have been taken by FSF and authors to ensure that these resources perform the task described, neither the FSF nor authors can be held responsible for any problems experienced while using this resource. Users must ensure that the software is fit for the purpose for which the user is utilising this resource.