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
