jmurphy
Well-known member
John,
My images are captured using INDI. With a GEM it reports RA and DEC but not altitude. It does report Airmass. Could NSG make use of Airmass to rank the subframes by altitude? I don't notice any other FITS keyword that would work, but maybe I'm missing something.
Thanks,
John
Code:File Type : FITS File Type Extension : fits MIME Type : image/fits Bitpix : 16 Naxis : 2 Naxis 1 : 9576 Naxis 2 : 6388 Extend : T Bzero : 32768 Bscale : 1 Roworder : TOP-DOWN Instrument : ZWO CCD ASI6200MC Pro Telescope : LX850 Observer : Unknown Object : M81_M82 Exptime : 1.200000e+02 Ccd-temp : -1.00e+01 Pixsize 1 : 3.760000e+00 Pixsize 2 : 3.760000e+00 Xbinning : 1 Ybinning : 1 Xpixsz : 3.760000e+00 Ypixsz : 3.760000e+00 Frame : Light Imagetyp : Light Frame Xbayroff : 0 Ybayroff : 0 Bayerpat : RGGB Focallen : 6.75e+02 Aptdia : 1.30e+02 Scale : 1.149218e+00 Sitelat : 4.064333e+01 Sitelong : -8.011583e+01 Airmass : 1.139418e+00 Objctra : 9 55 28.35 Objctdec : 69 18 38.92 Ra : 1.488681e+02 Dec : 6.931081e+01 Equinox : 2000 Crval 1 : 1.4886813095e+02 Crval 2 : 6.9310812380e+01 Radecsys : FK5 Ctype 1 : RA---TAN Ctype 2 : DEC--TAN Crpix 1 : 4.7880000000e+03 Crpix 2 : 3.1940000000e+03 Secpix 1 : 1.1492184809e+00 Secpix 2 : 1.1492184809e+00 Cdelt 1 : 3.1922735580e-04 Cdelt 2 : 3.1922735580e-04 Crota 1 : 8.9256800000e+01 Crota 2 : 8.9256800000e+01 Observation Date : 2021-03-20T03:43:24.821 Gain : 100. Offset : 20. Fratio : 5.19230769230769
Great idea!
OK, in version 1.2.2, if no altitude header is found, it uses the "AIRMASS" header.
The last target image read sets the column header to either "Airmass" or "Altitude".
The C++ version (in development) will include "Airmass" as an extra column.
Regards, John Murphy
[Edit: deleted NormalizeScaleGradient (new version attached to next post)]
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