Hi Patrick,
Thank you for your help. It is indeed very difficult to achieve inversion of temperature and humidity profiles under cloud conditions. I have another question, is it in the planetary toolbox that the best way to use it is iyFOS or iyDOTIT? IyMC seems too slow. At 2023-11-06 15:52:08, "Patrick Eriksson" <patrick.eriks...@chalmers.se> wrote: >Hi, > >Very hard to answer without more specific information what you want to do. > >If you want to do OEM-type inversion involving scattering, then iyHybrid >is the only option inside ARTS. It is reasonable fast, if used with e.g. >DISORT. > >DISORT is the fastest scattering solver inside ARTS, but has several >limitations. > >iyMC is the slowest, but still the one to use for 3D calculations. > >To retrieve atmospheric temperature or humidity with scattering present >is a very hard problem. > >Bye, > >Patruick > > > >On 2023-11-02 13:44, suifengbenpao2023 wrote: >> Hi Patrick, >> >> Thanks again for your help! Is the iymc method generally slower than the >> iydoit method? If the radiative transfer rate calculated by the scattering >> method is very slow, does it mean that it is difficult to invert the >> atmospheric temperature and humidity profile from the scattering scene? Is >> there a quick way to calculate scattering? >> >> Looking forward to your reply again, thanks! >> >> Sincerely， >> >> Jiaan He. >> >> At 2023-11-02 16:15:43, "Patrick Eriksson" <patrick.eriks...@chalmers.se> >> wrote: >>>Hi, >>> >>>In general, it works perfectly fine to use PlanckBT from start. But >>>could depend on the calibration of the instrument you simulate. >>> >>>There is one exception, and that's iyMC. It does not accept PlanckBT, >>>just RJBT. >>> >>>Bye, >>> >>>Patrick >>> >>> >>>On 2023-11-02 08:42, suifengbenpao2023 wrote: >>>> Hi Patrick, >>>> >>>> Thank you for your help! Based on your suggestion, I will no longer use >>>> iyfos and instead use iyMC to handle scattering situations. But I have >>>> another question that confuses me. I often see routines that use >>>> StringSet (iy_unit, "1") for unit conversion before calculating >>>> scattering, and then ultimately convert to StringSet (iy_unit, >>>> "PlanckBT"). Why do we do this? Can't we just switch to Planck >>>> brightness temperature? >>>> >>>> Looking forward to your reply again, thanks! >>>> >>>> Sincerely， >>>> Jiaan He. >>>> >>>> >>>> At 2023-11-02 14:17:07, "Patrick Eriksson" <patrick.eriks...@chalmers.se> >>>> wrote: >>>>>Hi, >>>>> >>>>>FOS is "dead" and no plans to get it back to live. >>>>> >>>>>A main reason for starting FOS was to have scattering calculations, >>>>>providing the Jacobian. This was newer completed. Instead, also iyHybrid >>>>>was started and that method provides a Jacobian (not the totally full >>>>>one, but seems to be good enough). >>>>> >>>>>Bye, >>>>> >>>>>Patrick >>>>> >>>>>On 2023-11-02 01:20, suifengbenpao2023 wrote: >>>>>> Dear ARTS community, >>>>>> >>>>>> I am dealing with scattering situations and have used the iyFOS method >>>>>> in Arts-2.2 version, but there is no FOS method in Arts-2.4. May I ask >>>>>> if the method name has changed? I know and have consulted relevant >>>>>> literature on MC and DOIT methods, but is there any reference to FOS >>>>>> methods? >>>>>> >>>>>> Looking forward to your reply！Thank you! >>>>>> >>>>>> Best wishes, >>>>>> >>>>>> Jiaan He
