ImageIntegration problem

[georg.viehoever]

Hi Juan,

according to http://pixinsight.com/forum/index.php?topic=1366.0, StarGenerator uses different projections depending on which region of the sky you are looking at. I always wondered if using Tangential (Gnomic) Projections (TAN in WCS) would be a better way to do it, since this is what you get on your CCD when you shoot the sky. The other projections make more sense for wide field cases (wide maybe >10 degree). Why did you choose the projections that you implemented?

Georg

[NKV]

Juan,

In fact I think this can be an excellent data set to finish the series of video tutorials on StarAlignment (and to introduce StarGenerator by the way). If I find that this work can't be done in optimal conditions, be sure we'll modify the existing tools and/or create new ones, as necessary.

I'll be glad to see the full force PixInsight magic in your hands.
I sent 4 zip files. Use them as you like.

Nikolay.

[Juan Conejero]

Hi Georg,

Do you refer to this projection:

http://mathworld.wolfram.com/GnomonicProjection.html

I can implement it very easily. In my initial design of the StarGenerator tool I selected three conformal projections (stereographic polar, Lambert conformal conic and Mercator cylindrical projections) to cover the whole sky. Conformal projections provide what I understand is the most accurate representation geometrically because they preserve angles; however this is just a personal judgement and your criterion is equally valid. Count with Gnomonic projection (if this is what you refer to) implemented very soon.

[Juan Conejero]

I sent 4 zip files.

Thanks Nikolay!

[georg.viehoever]

Juan,

...Do you refer to this projection:

http://mathworld.wolfram.com/GnomonicProjection.html
...

Yes, this is what I refer to. I like the TAN projection because this is what actually happens when you project the sky onto your CCD via your telescope. It models the physical process. It also is always the same no matter what region of sky you project. TAN does have the disadvantage of causing large distortions for wide fields (and naturally it can cover <180 degrees only), but the area distortions by conformal (=angle preserving) projections are also considerable for wider fields.

Georg

[harist]

One more bug? See pic.
300 images it is maximum for ImageIntegration ?

Just had the same problem at the 300th file (using windows 7 pro 64 bit). Has a solution been found to this?
PCL FITS Format Support: Unable to open FITS file:
D:/Astrophotos/All M63/Al_BINT_C_m63b_t60_63_r.fit
CFITSIO error message stack:
01 : failed to find or open the following file: (ffopen)
02 : D:\Astrophotos\All M63\Al_BINT_C_m63b_t60_63_r.fit


Thanks,
Tasos

[NKV]

Just had the same problem at the 300th file (using windows 7 pro 64 bit). Has a solution been found to this?

Yes, look message http://pixinsight.com/forum/index.php?topic=2053.msg13262#msg13262