Hi,
I have been following the
lightvortexastronomy (LVA) tutorial for pre-processing of images. I have a question about how to deal with data from multiple nights.
For images from a single night the LVA tutorial suggests the following:
1. Image calibration
2. Cosmetic Correction
3. DeBayering
4. Optimisation of weightings of images using SubframeSelector script.
followed by
5. Star alignment
6. Local normalisation
7. Image integration
8. Drizzle integration
So far so good. Now, my question is at which step to combine data from multiple nights.
LVA suggests to do steps 1-4 for each night and then to combine all data starting with the star alignment (step 5). Now this approach will calculate individual weightings (between 50 and 100) for each image for each night before the combination. The best images for each night will be the highest ranked. However, if one night was particularly bad (windy, cloudy etc) the images from that night may be weighted as high or even higher than much better images from the other nights.
Wouldn't it make sense to combine images from all nights in the SubframeSelector and weight them all based on their quality compared to each other and not "separated" by nights?
Thanks in advance.