Hi Emma, No problem, I understand that this is far from obvious.
In short, qarts is an attempt to make a relatively general interface to ARTS. What you can do with qpack2 is more restricted, but tries to streamline the retrieval procedure. In a way, qpack2 is sub-set of qarts where some things happen "automatically". There are some comments in the qpack2 pdf document. Anyhow, for how to use qarts (without doing retrievals), see e.g. qarts_demo2 in the demos folder. You will recognise the Q structure. And to run arts there are some different functions depending on what you want to do, but arts_y is by far the most important one. That is, [y,y_aux] = arts_y( Q ); is matlab code. If you have set up a Q to be used with qpack2, you need to make some modifications. At least you need to set SENSOR_POS and SENSOR_LOS. The rest depends on how you have set VMRs etc. in Q. Sorry, can not give you a complete answer there. The best help is the demo scripts in /demos. Note e.g. that arts_y is used in qpack2_demo to generate a test measurement, to be inverted. Bye, Patrick On 2014-11-27 15:51, Turner, Emma C. wrote: > Hi Patrick, > > Apologies for my ignorance but what is the more general qarts system? > Does that mean applying the below code snippet in the arts C++ code? > > Thanks Emma ________________________________________ From: Patrick > Eriksson [[email protected]] Sent: 27 November 2014 14:33 > To: Turner, Emma C. Cc: [email protected] Subject: Re: [Qpack] > Obtaining Y units of Transmission from q_pack > > Hi Emma, > > CC to qpack list as this is of general interest. And we prefer if > all questions go to any of the arts and qpack lists. > > The answer is: > > [y,y_aux] = arts_y( Q ); > > > There is now way to obtain the aux vars by qpack2. If you want this > information you must use the more general qarts system, where then > arts_y is the function to use. Or, of course, using arts directly. > > Bye, > > Parick > > > > > On 2014-11-27 15:07, Turner, Emma C. wrote: >> Thanks Patrick, >> >> It runs now, how do I extract the data for tau from Y? >> >> Bye, Emma ________________________________________ From: Patrick >> Eriksson [[email protected]] Sent: 27 November 2014 >> 13:50 To: Turner, Emma C.; [email protected] Subject: Re: >> [Qpack] Obtaining Y units of Transmission from q_pack >> >> Dear Emma, >> >> Uuups, a piece of documentation that has not been updated. I will >> fix that. >> >> I assume you use iyEmissionStandard, then you can check out the aux >> var options by >> >> arts -d iyEmissionStandard >> >> That is, the option is >> >> Q.IY_AUX_VARS = { 'Optical depth' }; >> >> that gives you tau, which you easiliy can covert to transmission. >> >> Bye, >> >> Patrick >> >> >> On 2014-11-27 14:43, Turner, Emma C. wrote: >>> Dear mailing list, >>> >>> Using the ARTS forward model to simulate a ground-based sensor I >>> am looking to obtain total Transmission values (in %) in addition >>> to Brightness Temperature values. ARTS leads me to believe I can >>> do this using iy_aux_vars where in the documentation it states >>> that "Transmission, total" is a valid option when I use ycalc - >>> http://www.sat.ltu.se/arts/docserver-stable/variables/iy_aux_vars >>> >>> >>> I'm having trouble with the syntax in q_pack2, when I include >>> >>> Q.IY_UNIT = 'PlanckBT'; Q.YCALC_WSMS = { >>> 'yCalc' }; Q.IY_AUX_VARS = { 'Transmission' } >>> >>> to the code it complains that, 'For calculations using yCalc, >>> *iy_aux_vars* can not include variables of along-the-path or >>> extinction matrix type.' but when I add 'Total' like it suggests >>> in the documentation >>> >>> Q.IY_AUX_VARS = { 'Transmission', 'Total' } >>> >>> it complains that, 'In *iy_aux_vars* you have included: "Total". >>> This choice is not recognized.' >>> >>> Can someone help me? >>> >>> Many thanks Emma >>> >>> This message (and any attachments) is for the recipient only. >>> NERC is subject to the Freedom of Information Act 2000 and the >>> contents of this email and any reply you make may be disclosed by >>> NERC unless it is exempt from release under the Act. Any material >>> supplied to NERC may be stored in an electronic records >>> management system. >>> _______________________________________________ qpack mailing >>> list [email protected] >>> https://www.sat.ltu.se/mailman/listinfo/qpack >>> >> >> This message (and any attachments) is for the recipient only. NERC >> is subject to the Freedom of Information Act 2000 and the contents >> of this email and any reply you make may be disclosed by NERC >> unless it is exempt from release under the Act. Any material >> supplied to NERC may be stored in an electronic records management >> system. >> > > This message (and any attachments) is for the recipient only. NERC is > subject to the Freedom of Information Act 2000 and the contents of > this email and any reply you make may be disclosed by NERC unless it > is exempt from release under the Act. Any material supplied to NERC > may be stored in an electronic records management system. > _______________________________________________ qpack mailing list [email protected] https://www.sat.ltu.se/mailman/listinfo/qpack
