FastRT is a fast, yet accurate, UV simulation tool that computes downward surface UV doses, UV indices, and irradiances in the spectral range 290 to 400 nm with a resolution as small as 0.05 nm. It computes a full UV spectrum within a few milliseconds on a standard PC, and enables the user to convolve the spectrum with user-defined and built-in spectral response functions including the International Commission on Illumination (CIE) erythemal response function used for UV index calculations. The program accounts for the main radiative input parameters, i.e., instrumental characteristics, solar zenith angle, ozone column, aerosol loading, clouds, surface albedo, and surface altitude. FastRT is based on look-up tables of carefully selected entries of atmospheric transmittances and spherical albedos, and exploits the smoothness of these quantities with respect to atmospheric, surface, geometrical, and spectral parameters. An interactive site, http://nadir.nilu.no/~olaeng/fastrt/fastrt.html, enables the public to run the FastRT program with most input options. This page also contains updated information about FastRT and links to freely downloadable source codes and binaries.
FastRT is a fast, yet accurate UV simulation tool which computes downward surface UV doses, indices and irradiances in the spectral range 290 - 400 nanometers. It takes the main radiative input parameters into account, i.e. instrumental characteristics, solar zenith angle, ozone column, aerosol loading, clouds, surface albedo and topography. CheckUVSpec is a quality assurance program to check incoming UV spectra for an EU-funded European UV database. The algorithm is based on comparisons of measured UV spectra with FastRT simulations. The QA program can also be run by users to check measured UV spectra for obvious errors and to report the most likely type of atmospheric and surface scenario which was present during the measurements. An interactive URL WWW site: http://zardoz.nilu.no/~olaeng/fastrt/fastrt.html allows the public to run the FastRT program with most input options. This page also contains updated information about the FastRT and CheckUVSpec and links to freely downloadable source codes and binaries.