APPM - How Good Is The Model ? #appc
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Erkaslan Aygen
Hi Ray, Thank you for your detailed answer, much appreciated. The weather should be all good tonight for a bigger model :). Is there a simple way to add points to an existing model ? Or, do I need to start it over from scratch ? My best regards, Aygen Le dim. 17 avr. 2022 à 16:39, Ray Gralak <iogroups@...> a écrit :
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Ray Gralak
Hi Aygen,
> * First, any comments with regards to the overall RMS results ?
The RMS numbers look okay.
> * Would you import the points into excel and then try to get rid of some outliers to further improve the overall > model ?
You do not need excel to do that. Click the “Model” button on APCC’s Pointing model tab. This will open the window shown below. There are several ways to purge off points:
1. You can exclude points with pointing errors in RA or Dec greater than the number you enter in arc-seconds. Clicking the up/down arrows will adjust the value by 10 arc-seconds. 2. If you hover the mouse over a point in the graphs, the representative point in the table above will be made visible and selected. You can then exclude that point by unchecking it. 3. You can manually select any point in the table to exclude it.
> * Environmental parameters : the model was ran yesterday during quite a windy night & during full moon. > Could these two parameters affect the overall accuracy of the model ?
A few missed plate-solves near the moon will have little effect. Wind could potentially affect RMS, but you should not worry about RMS too much. If you want the best possible tracking accuracy, collect more points and use Dec Arc tracking. This type of modeling is independent of the all-sky model. In fact, both models (full-sky and Dec-Arc) coexist in APCC and you can switch between them with a single checkbox. Provided the setup produces high pointing repeatability (e.g. no moving optics like from a large mirror), tracking is usually more accurate than the all-sky model with 5 or more points per declination arc. If the mount is permanently set up, you could spend a couple of hours on one moonlit night to cover the entire sky, with 300-500 points.
-Ray
-Ray
> -----Original Message----- > From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Erkaslan Aygen > Sent: Sunday, April 17, 2022 12:14 AM > To: main@ap-gto.groups.io > Subject: [ap-gto] APPM - How Good Is The Model ? #appc > > Morning all, > > After having fined-tuned my polar alignement through PEMPRO (what a great tool !!!!), I ran yesterday a new > model with approximately 150 points. Below is a screenshot of the models (East RMS 11.6 - West RMS 9.9). > > I am looking for some inputs : > > > > * First, any comments with regards to the overall RMS results ? > * Would you import the points into excel and then try to get rid of some outliers to further improve the overall > model ? > * Environmental parameters : the model was ran yesterday during quite a windy night & during full moon. > Could these two parameters affect the overall accuracy of the model ? > > Thank you and have a wonderful Easter weekend. > > Aygen > > > > > > > > |
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Erkaslan Aygen
Morning all,
After having fined-tuned my polar alignement through PEMPRO (what a great tool !!!!), I ran yesterday a new model with approximately 150 points. Below is a screenshot of the models (East RMS 11.6 - West RMS 9.9). I am looking for some inputs :
Aygen  
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