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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