[Kstars-devel] help with batch processing section of calculator and airmass calculation

[Christian Ambros]

Hi,

the problem with the other formulas (you can finde them at
en.wikipedia.org/wiki/airmass) is, they maybe more precize but they have a
different scala. You say that 1/sin(h) is use, which contributes to a
homogeneous plane-parallel atmosphere with no curvature of earth surface
attended. It gives reasonable results down to heights 10 degrees above
horizon.

I think it should be discussed whether it is a good idea to change it or
leaf it for the users convenience as it is. Only pros would rather notice,
but more often they would ignore it. I am not sure how using a  different
formula with an implied different scalar relates to different values in
photometry.
A correct airmass is necessary for  absolute photometry.
I can provide such a batch, if it is considered necessary.

For the problem with the batch processing an example file would just help so
I can figure out and maybe write a script for producing the correct
input/output syntax for the processing.

regards,
Christian


On Sat, Sep 11, 2010 at 10:43 AM, Akarsh Simha <akarshsimha at gmail.com>wrote:

> Hi Christian,
>
> >    Hi,
> >
> >    I have two questions. Where can I get an example file and some
> >    documentation about the batch processing in the calculator section. An
> >    example for the input and the output file would be nice.
>
> The batch processing had a lot of bugs, I don't know if anybody uses
> it and whether there's any documentation regarding that. So I'm afraid
> I don't know the answer to this, but I guess other developers here
> might.
>
> >    The second questions is, what formular did you use to determin the
> >    airmass? Was it Pickering (2002) X = 1/sin(h+244/(165+47h^1.1)) and
> where
> >    in the source code do I find it?
>
> I found this in the file kstars/dialogs/detaildialog.cpp (line 326):
>
>    //Airmass is approximated as the secant of the zenith distance,
>    //equivalent to 1./sin(Alt).  Beware of Inf at Alt=0!
>
> and it's followed by the same calculation described in the comment.
>
> That's bad! If you have the source code checked out and are capable of
> compiling it, you're welcome to replace it with the better formula you
> have and submit a patch.
>
> Thanks for pointing this out.
>
> Regards
> Akarsh
>



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