Re: question about plate solving....what does Order mean


Sep 20, 2012

 


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#50787 Sep 20, 2012

It is the order of the distortion mapping polynomial used by PinPoint to

compensate for optical distortion, to make the astrometric accuracy as good as

possible across the entire frame. If you don't have a very unusual need, leave

it set to 0 and let PinPoint self-adjust based on the number of matched stars.

If the order is too high for the number of matched stars it can actually

increase errors in transforming XY to RA-Dec for unmatched stars.



-- Bob

> Hi,

>

> Newbie question. When I plate solve something....I understand the residual for solving star positions....but what is "order"??

>

> Thx.

> Wes

>

>

>

---------------

>

> Yahoo! Groups Links

>

>

>

>







[Non-text portions of this message have been removed]



----------------------------

#50799 Sep 20, 2012

I'm not changing it.....this is a result.



It reports the average residual in arcsec and then an order.



I'm trying to understand what to look at to see how good the plate solve is. What results should I be comparing from one plate solve to another to ensure I am getting good results???



I wondered if a higher order or lower order was better some way.



Wes --- In MaxImDL@yahoogroups.com, Bob Denny rdenny@...> wrote:

>

> It is the order of the distortion mapping polynomial used by PinPoint to

> compensate for optical distortion, to make the astrometric accuracy as good as

> possible across the entire frame. If you don't have a very unusual need, leave

> it set to 0 and let PinPoint self-adjust based on the number of matched stars.

> If the order is too high for the number of matched stars it can actually

> increase errors in transforming XY to RA-Dec for unmatched stars.

>

> -- Bob

>

> > Hi,

> >

> > Newbie question. When I plate solve something....I understand the residual for solving star positions....but what is "order"??

> >

> > Thx.

> > Wes

> >

> >

> >

---------------

> >

> > Yahoo! Groups Links

> >

> >

> >

> >

>

>

>

> [Non-text portions of this message have been removed]

>



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