This is an interesting presentation, although it stops at introducing the workflow for images.
http://www.salt.ac.za/~crawford/lecture ... graphs.pdf
Can anyone elaborate on aperture extraction?
Interesting presentation with workflow
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Re: Interesting presentation with workflow
Hi Nick
thanks for sharing the basics
thanks for sharing the basics
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Re: Interesting presentation with workflow
In "traditional" astronomical spectroscopy the spectrum of the object is only a portion of the area of the image. It is often flanked by reference spectra, sky spectra, etc. Aperture extraction simply means choosing the part of the image desired and cutting it out. An exotic name for a common function. If you use a spectrograph with a free running camera to grab a series of spectra as the Sun drifts across the slit (becoming more common all the time) you could use aperture extraction to pull out only the line of interest and reduce the size of the data file, for example.Nick wrote:This is an interesting presentation, although it stops at introducing the workflow for images.
http://www.salt.ac.za/~crawford/lecture ... graphs.pdf
Can anyone elaborate on aperture extraction?
Joe
Observing the Sun with complex optical systems since 1966, and still haven't burned, melted or damaged anything.
Not blind yet, either!
Light pollution? I only observe the Sun, magnitude -26.74. Pollute that!
Not blind yet, either!
Light pollution? I only observe the Sun, magnitude -26.74. Pollute that!
Re: Interesting presentation with workflow
Ahh - got it. Subframing the CCD when the slit spectra doesn't fill the image.Spectral Joe wrote:In "traditional" astronomical spectroscopy the spectrum of the object is only a portion of the area of the image. It is often flanked by reference spectra, sky spectra, etc. Aperture extraction simply means choosing the part of the image desired and cutting it out. An exotic name for a common function. If you use a spectrograph with a free running camera to grab a series of spectra as the Sun drifts across the slit (becoming more common all the time) you could use aperture extraction to pull out only the line of interest and reduce the size of the data file, for example.Nick wrote:This is an interesting presentation, although it stops at introducing the workflow for images.
http://www.salt.ac.za/~crawford/lecture ... graphs.pdf
Can anyone elaborate on aperture extraction?
Joe