Hi Patrick,
nevermind. The ppath_agenda was set to FollowSensorLosPath, which
prolongs the path to the boundaries of the atmosphere. Now that I use
TransmitterReceiverPath, the results look fine :)
Best regards,
Conrad
On 08.11.22 13:43, Conrad Roessler wrote:
Hi Patrick,
thank you for your fast response!
It seems that the path is properly configured (judging by writing
ppath in an xml file at several points within the script) until ycalc
is called. After that, it is set to 80 km instead of the desired value.
I set the sender and receiver position up like this:
# Postion and line-of-sight of sensor
VectorSet( rte_pos, [0,49,11 ] )
VectorSet( rte_los, [ 73.3, 24 ] )
VectorSet( rte_pos2, [3000, 49.1,11 ] )
ppathCalc
ppathFromRtePos2
WriteXML( output_file_format, ppath, "results/ppath.xml")
Which yields the expected path. However, once ycalc is called, the
ppath starting height is back at 80 km again and changing rte_pos2
doesn't seem to affect that.
Best regards,
Conrad
On 08.11.22 12:04, Patrick Eriksson wrote:
Conrad,
Please note that the ppath points are listed starting at the side of
the sensor. If the sensor is outside the atmosphere, the first point
will be at the top of the atmosphere, i.e. 80 km in this case. If you
look at the last ppath point, it should be at 3 km.
If you mean that you get more or less the same result when changing
ppath_lmax (and/or ppath_lraytrace), that is a good sign. This means
that the propagation path is sufficiently resolved.
I hope this answered your questions.
Bye,
Patrick
On 2022-11-08 11:34, Conrad Roessler wrote:
Hi,
I played a bit around with the script under
arts/controlfiles/artscomponents/transmission/TestTransmission.arts.
What I want to do is to simulate the spectral resolved transmission
between a point somewhere in the atmosphere and a receiver on ground
(line-by-line transmission is taken from HITRAN and the atmospheric
model is just a generic mid-latitude summer one). For this, I set
rte_pos2 to the position of the sender and rte_pos to the position
of the receiver. I then use ppathFromRtePos2 in order to get rte_los.
At the end of the script I added WriteXML( output_file_format,
ppath, "ppath.xml" ).
The propagation path still starts at about 80 km height although the
height of rte_pos2 is set to about 3 km and the transmission
returned within iy seems to be independent of the propagation path
length. What might I be doing wrong?
Best regards,
Conrad Rößler
--
Conrad Rößler
QIV Group
Max Planck Institute for the Science of Light
Staudtstr. 2
91058 Erlangen
Germany
phone: +49 9131 7133159
email: conrad.roess...@mpl.mpg.de
