Re: [arts-users] zenith angles

[Patrick Eriksson]

Daniele,

Nice to see that you are using ARTS. Yes, rigorous=0 should be safe for your case. This 
check is mainly relevant for limb sounding.


Depending on how much you care about the surface, DISORT is an alternative that could be 
faster.


Looks like you are doing stuff very similar to what we are doing. We should get an article 
accepted very soon involving GMI, the onion peeling algorithm, LPA and Evans! We will send 
it when it's out.


Bye,

Patrick



On 2022-03-22 12:04, daniele.case...@artov.isac.cnr.it wrote:

Dear all,

I am trying to simulate GMI with ARTS, some standard ice habits, using DOIT. However, I 
get an error from DoitGetIncoming:
ERROR: Radiance difference between interpolation points is too large (factor 100) to 
safely interpolate. This might be due to za_grid being too coarse or the radiance field 
being a step-like function.

Happens at boundary 104 between zenith angles 92.3077 and 96.9231deg
for frequency #2, where radiances are 3.90337e-19 and 4.14798e-17 W/(sr m2 Hz).

I tryed to increase the N_za_grid in DOAngularGridsSet however the error remains, unless I 
set N_za_grid to a very large number (about 100) that crashes arts.
These happens with all the ice habits that I tested (EvansSnowAggregates and 
LargePlateAggregate).
Moreover, I used doit_scat_fieldCalc in the doit_scat_field_agenda (however using 
doit_scat_fieldCalcLimb does not change much), and I am using ice water contents derived 
from OnionPeeling code (with CPR profiles).
My intention is to simulate a down looking view geometry, so I do not expect that such a 
fine za grid is needed.


I set the sensor geometry to:
   viewing_angles=0
   sensor_pos=[ 1, 1, 817e3]
   sensor_los=[1, 1, 135.0]
If I run DoitGetIncoming with rigorous=0 the simulation does not give an error, however is 
it safe?
Other option could be to write a za_grid_opt_file like the one in 
testdata/testdoit_za_grid_opt.xml.

Any hint on how to proceed, would be very much appreciated.

Thank you very much,

Daniele Casella


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[arts-users] zenith angles

[daniele . casella]

Dear all,

I am trying to simulate GMI with ARTS, some standard ice habits, using  
DOIT. However, I get an error from DoitGetIncoming:
ERROR: Radiance difference between interpolation points is too large  
(factor 100) to safely interpolate. This might be due to za_grid being  
too coarse or the radiance field being a step-like function.

Happens at boundary 104 between zenith angles 92.3077 and 96.9231deg
for frequency #2, where radiances are 3.90337e-19 and 4.14798e-17  
W/(sr m2 Hz).


I tryed to increase the N_za_grid in DOAngularGridsSet however the  
error remains, unless I set N_za_grid to a very large number (about  
100) that crashes arts.
These happens with all the ice habits that I tested  
(EvansSnowAggregates and LargePlateAggregate).
Moreover, I used doit_scat_fieldCalc in the doit_scat_field_agenda  
(however using doit_scat_fieldCalcLimb does not change much), and I am  
using ice water contents derived from OnionPeeling code (with CPR  
profiles).
My intention is to simulate a down looking view geometry, so I do not  
expect that such a fine za grid is needed.


I set the sensor geometry to:
  viewing_angles=0
  sensor_pos=[ 1, 1, 817e3]
  sensor_los=[1, 1, 135.0]
If I run DoitGetIncoming with rigorous=0 the simulation does not give  
an error, however is it safe?
Other option could be to write a za_grid_opt_file like the one in  
testdata/testdoit_za_grid_opt.xml.

Any hint on how to proceed, would be very much appreciated.

Thank you very much,

Daniele Casella

--
Daniele Casella
Istituto di Scienze dell'Atmosfera e del Clima - Sezione di Roma - CNR
Area di ricerca di Tor Vergata Via del fosso del cavaliere,100
00133 Roma - Italy Tel. +39-06-4993-4337

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[arts-users] Fwd: [Members.cen] [mpicen] Fwd: Job for remote sensing scientist at UFZ Leipzig

[stefan . buehler]

> Anfang der weitergeleiteten Nachricht:
> 
> Von: Leonore Jungandreas 
> Betreff: [Members.cen] [mpicen] Fwd: Job for remote sensing scientist at UFZ 
> Leipzig
> Datum: 17. März 2022 um 11:46:11 MEZ
> An: mpi...@uni-hamburg.de
> 
> FYI
> 
> 
> 
>  Forwarded Message 
> Subject:  Job for remote sensing scientist
> Date: Tue, 15 Mar 2022 22:14:15 +0100
> From: Jian Peng  
> To:   ufztb5-mod...@ufz.de , 
> rsc4ea...@lists.uni-leipzig.de 
> 
> Dear colleagues,
> 
> Our team is looking for a highly-motivated remote sensing scientist to 
> contribute on the understanding of terrestrial water dynamics and climate 
> extremes. More information can be found here:
> 
> https://recruitingapp-5128.de.umantis.com/Vacancies/2399/Description/2 
> 
> 
> Please help to circulate within your network, and do not hesitate to contact 
> me for any questions. Thank you.
> 
> Best regards,
> Jian
> 
> --
> Prof. Dr. Jian Peng 
> Department Remote Sensing 
> Helmholtz Centre for Environmental Research - UFZ
> Permoserstraße 15, 04318 Leipzig, Germany
> 
> Professor for Hydrology and Remote Sensing, Leipzig University
> Co-Editor-in-Chief, Geoscience Data Journal 
> 
> 
> E-mail: jian.p...@ufz.de 
> Phone: +49 341-235-1071
> Web: https://www.ufz.de/index.php?en=47410 
> 
> 
> Helmholtz-Zentrum für Umweltforschung GmbH - UFZ
> Sitz der Gesellschaft: Leipzig
> Registergericht: Amtsgericht Leipzig
> Handelsregister Nr. B 4703
> Vorsitzender des Aufsichtsrats: MinR Wilfried Kraus
> Wissenschaftlicher Geschäftsführer: Prof. Dr. Georg Teutsch
> Administrativer Geschäftsführer: Dr. Sabine König
> 
> ___
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> members@mailman.rrz.uni-hamburg.de
> https://mailman.rrz.uni-hamburg.de/mailman/listinfo/members.cen

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