http://www.libradtran.org/ 2026-04-17T11:50:03+00:00 http://www.libradtran.org/ http://www.libradtran.org/lib/exe/fetch.php?media=wiki:dokuwiki.svg text/html 2013-10-18T11:40:59+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.libradtran.org/doku.php?id=user_area:adding_atmospheric_levels_for_single_scattering_lidar&rev=1382096459&do=diff If you use the single scattering lidar in uvspec source sslidar the vertical resolution of the lidar profile is typically much better than the vertical resolution of the provided atmospheric profiles. The optical properties are by default assumed to be constant within the atmospheric layers, which results in steps in the lidar profiles. text/html 2009-01-16T09:03:44+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.libradtran.org/doku.php?id=user_area:bugs&rev=1232096624&do=diff Known bugs text/html 2013-10-19T11:22:55+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.libradtran.org/doku.php?id=user_area:carbon_monitoring_satellite_carbonsat&rev=1382181775&do=diff Carbon Monitoring Satellite - CarbonSat The primary mission objective of CarbonSat is the “quantification and monitoring of CO2 and CH4 sources and sinks at the regional scale for i) a better understanding of the processes that control the Carbon Cycle dynamics and ii) an independent estimate of local greenhouse gas emissions (fossil fuel, geological CO text/html 2013-03-13T14:36:49+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.libradtran.org/doku.php?id=user_area:converting_cloud_water_path_to_cloud_optical_depth&rev=1363185409&do=diff libRadtran's input for cloud layer properties (via wc_file or ic_file) requires layer input specified as cloud water/ice path (CWP) and effective radius (r_eff). However, some applications prefer to work in terms of cloud optical depth (τ) and effective radius. In the geometric optics limit (valid in the solar spectral region), conversion between cloud water path and cloud optical depth is given by: τ=(3/2)*(CWP/r_eff) text/html 2009-12-03T14:20:02+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.libradtran.org/doku.php?id=user_area:fast_lut_method_based_on_libradtran&rev=1259850002&do=diff GNUMAGIC is a fast eigenvector hybrid look-up table method for the calculation of global and direct irradiance. MAGIC contains a interface for satellite based cloud information provided by the Heliosat meethod. Libradtan has been used to develop GNUMAGIC, in detail for sensitivity studies and the calculation of the look-up tables. The software including documentation is available at: text/html 2013-10-16T07:55:50+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.libradtran.org/doku.php?id=user_area:fluorescence_explorer_flex&rev=1381910150&do=diff FLuorescence EXplorer The FLuorescence EXplorer (FLEX) mission is devoted to monitor the photosynthetic activity of the terrestrial vegetation layer. The natural fluorescence signal is weak compared to the reflected solar radiation. However, by measuring at wavelengths where the solar spectrum is attenuated, for example the O text/html 2013-10-28T13:39:47+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.libradtran.org/doku.php?id=user_area:generating_lookup_tables&rev=1382967587&do=diff Generate lookup tables It is sometimes required to generate lookup tables which, for example, contain radiances as function of one or more variable atmospheric parameters. Besides the wavelength loop, there is no looping over input parameters implemented in text/html 2008-10-13T23:00:56+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.libradtran.org/doku.php?id=user_area:how_to_write_equations&rev=1223938856&do=diff The math plugin allows to e.g. write the radiative transfer equation: <m>dL/{d tau}=-L+omega/{4pi}int{4pi}{}L(Omega prime){} p (Omega prime,Omega) d Omega prime</m> text/html 2013-10-21T13:26:41+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.libradtran.org/doku.php?id=user_area:interesting_applications&rev=1382362001&do=diff Interesting applications Rainbows with libRadtran --- Bernhard Mayer 2008/10/22 13:32 Plane-parellel versus pseudo-spherical versus spherical --- Arve Kylling 2008/10/27 13:03 Water reflectivity and the color of the Earth --- Bernhard Mayer 2008/12/03 14:29 UV radiation on tilted surfaces --- Arve Kylling 2009/01/29 15:29 FLuorescence EXplorer (FLEX) --- Arve Kylling 2013/10/15 15:00 Multi-angle polarization simulations (POLDER) --- Claudia Emde 2013/10/18 12:07 Carbon Monitoring Satell… text/html 2013-10-31T09:55:29+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.libradtran.org/doku.php?id=user_area:multi-angle_polarization_simulations_polder&rev=1383213329&do=diff Multi-angle polarization simulations POLDER/PARASOL instrument POLDER is a wide field of view imaging radiometer that has provided the first global, systematic measurements of spectral, directional and polarized characteristics of the solar radiation reflected by the Earth/atmosphere system. Its original observation capabilities have opened up new perspectives for discriminating the radiation scattered in the atmosphere from the radiation actually reflected by the surface. The technical detail… text/html 2011-11-02T16:35:44+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.libradtran.org/doku.php?id=user_area:netcdf_under_cygwin&rev=1320251744&do=diff Netcdf under cygwin A common problem for me and others (telling from discussions on the web) is the installation of a current netcdf under cygwin. Download from UNIDATA and installation following the INSTALL guide seem to work fine (make check is happy), but neither binaries nor library files are written to the text/html 2008-10-27T13:36:26+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.libradtran.org/doku.php?id=user_area:plane-parellel_versus_pseudo-spherical_versus_spherical&rev=1225114586&do=diff Plane-parallel versus pseudo-spherical versus spherical In texts about radiative transfer one often encounters expressions stating that “plane-parallel geometry is assumed”, or sometimes, even “pseudo-spherical” geometry is assumed. The statement text/html 2008-10-22T11:31:19+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.libradtran.org/doku.php?id=user_area:rainbows_with_libradtran&rev=1224675079&do=diff Rainbows with libRadtran To calculate a rainbow with libRadtran is relatively straightforward. It is computationally expensive but to generate the input is quite simple. Rainbows form when we have large water droplets. For this reason we first need to calculate optical properties for a size distribution with large droplets. We may use the mie tool to do that. The input file is very short: text/html 2008-10-13T16:34:20+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.libradtran.org/doku.php?id=user_area:related_literature&rev=1223915660&do=diff Literature, from users for users text/html 2013-10-18T11:40:39+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.libradtran.org/doku.php?id=user_area:tips_and_tricks&rev=1382096439&do=diff Tips and tricks, from users for users * How to write Equations * Netcdf under cygwin * Converting cloud water path to cloud optical depth * Adding atmospheric levels for single scattering lidar text/html 2008-10-13T16:34:20+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.libradtran.org/doku.php?id=user_area:user_area&rev=1223915660&do=diff Here users may share their experiences with libRadtran. * Interesting Applications * Tips and Tricks * Bugs * Related Literature text/html 2013-10-15T06:57:56+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.libradtran.org/doku.php?id=user_area:uv_radiation_on_tilted_surfaces&rev=1381820276&do=diff UV-radiation on tilted surfaces UV-radiation, whether measured or predicted, is typically presented for a horizontal surface. An example is the UV-index routinely reported to the general public. However, the exposed surface on which the UV-radiation acts, is seldom oriented similarly to the way the surface used to report and predict UV-levels. The libRadtran software tools may be used to calculate the radiation for a surface of any orientation and atmospheric and surface conditions. As an exam… text/html 2011-08-11T15:35:30+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.libradtran.org/doku.php?id=user_area:water_reflectivity&rev=1313076930&do=diff Water reflectivity and the color of the Earth Did you ever wonder where the blue ocean gets its color from? Of course you can answer this question with libRadtran! All you need to do is calculate radiances at TOA for a number of angles (umu,phi) using