Plate solve discrepancies?

Hi folks, quick question just for understanding:

I use ansvr for my plate solve and it’s working: however as an example; my first centre here might result in the solve being 700 pixels out and that solve takes far longer that the second solve which might be just 2 pixels out!

When I say far longer, I mean maybe 5 minutes, the second and accurate solve might take just 30 seconds.

Is this normal behaviour?

Ray

That’s what I would expect to happen. One question, why are you using
ANSVR as your primary solver and not PlateSolve2? PS2 is way faster, and
if it doesn’t solve then ANSVR can kick in with a blind solve.

Hi Joel, truth is I did not realise that, I’ll try to get ps2 set up, is it easy?

Ray

That’s what I would expect to happen. One question, why are you using
ANSVR as your primary solver and not PlateSolve2? PS2 is way faster, and
if it doesn’t solve then ANSVR can kick in with a blind solve.


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It’s not hard to set up. PS2 is already included in the SGP distribution.
You’ll just need to download the indexes and set a few parameters. Just
follow the help file instructions. The critical thing with PS2 is setting
the image scale very accurately.

Thanks Joel, I’ve completed the setup …just a question about image scale…is it the arcmin setting?

For eg…would I just put in my field of view in arc sec? A little confused by this setting.

Ray

Hi Joel, I’ve followed the logic and loaded an image, set to APM catalogue and it’s plate solved that image.
It’s filled the boxes with arc min etc…is that now complete?

My question now is: when I want to centre on my selected image, do I need to open ps2 and go through the same process or…does it work in the same way as ansvr…I.e just centre on an image …job done?

Thanks for your help Joel…great stuff

Ray

Assuming you have set up PS2 (locate catalog directories, you only need to
do that once), as long as you have set PS2 as the primary solver in the
control panel SGP does everything automatically. Again, the critical thing
is that you have the correct image scale entered in the control
panel/camera tab. But if you plate solved successfully then you must have
done that.

I’m not quite sure what you are trying to do. Are you loading an image in
SGP then plate solving it and wanting to use the solve coordinates as your
target coordinates? If that is what you’re trying to do, when you solve
the image the dialogue that pops up will have an option to “use these
coordinates for target x” (or something like that).

In any event it sounds like you’re on your way.

Hi Joel, thanks.
I had been loading a reference image then right click and centre here …using ansvr…
Thanks to your suggestions, I’ll now load the same ref image, plate solve it then use the solve co-ordinates as the ref…

I have found that it’s better if I just load the APM catalogue and leave the other out…

Ray