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Equipment Discussions >> Mounts

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anat
professor emeritus


Reged: 06/03/04

Re: AstroTortilla vs UniMap for plate solving new [Re: orlyandico]
      #6149243 - 10/21/13 02:25 AM

I use the Astrometry.net engine in Linux for solving images with plate sizes of about 1 deg or slightly less. It takes less than 5 sec on PC. And it takes about 15 sec or less on Arm Linux devices.

I always use downsample = 2 or 3. And I put the minimal number of index files having the largest sky diameter down to the sky diameter of about a half of the camera coverage (30 arcsec). If you put all index files in the index folder, the computation will be slow even though scale-low is specified. The engine still tries to use some of index files with small sky diameters.

Edited by anat (10/21/13 02:28 AM)


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orlyandico
Postmaster
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Reged: 08/10/09

Loc: Singapore
Re: AstroTortilla vs UniMap for plate solving new [Re: anat]
      #6149263 - 10/21/13 04:11 AM

hi Anat,

yup i have also pruned my indexes. What i noticed was even with downsampling the solve time was still high. i think downsampling itself consumes CPU so it would be better to bin.


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anat
professor emeritus


Reged: 06/03/04

Re: AstroTortilla vs UniMap for plate solving new [Re: orlyandico]
      #6149275 - 10/21/13 04:29 AM

If you convert your original image file to a compressed format (JPG) first, it may help. Plate-solving doesn't need a big raw file

Edited by anat (10/21/13 04:41 AM)


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Phillip Easton
sage


Reged: 12/24/10

Loc: DFW
Re: AstroTortilla vs UniMap for plate solving new [Re: orlyandico]
      #6149423 - 10/21/13 08:42 AM

Quote:

hi Anat,

yup i have also pruned my indexes. What i noticed was even with downsampling the solve time was still high. i think downsampling itself consumes CPU so it would be better to bin.




Have you tried adjusting sigma? I set mine to around 7 and get around 20-40 stars to search. Much quicker than if you are searching on several hundred.

Cheers!


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orlyandico
Postmaster
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Reged: 08/10/09

Loc: Singapore
Re: AstroTortilla vs UniMap for plate solving new [Re: Phillip Easton]
      #6149509 - 10/21/13 09:38 AM

i just checked and i was at sigma 30!

scale minimum 0, maximum 200 (arc-minutes). well i'll try again with tighter limits.


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Phillip Easton
sage


Reged: 12/24/10

Loc: DFW
Re: AstroTortilla vs UniMap for plate solving new [Re: orlyandico]
      #6149579 - 10/21/13 10:22 AM

That should help. Just a FYI I am imaging at 0.887 arcsec-pix. I set my limits too 0.75 - 1.0 arcsecperpix. Field is set to 45 and sigma 6 or 7. My exposure is 10sec. It solves in about 10 sec.

Cheers!


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orlyandico
Postmaster
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Reged: 08/10/09

Loc: Singapore
Re: AstroTortilla vs UniMap for plate solving new [Re: Phillip Easton]
      #6149630 - 10/21/13 10:52 AM

i've been using arcminwidth - but you can also use arcsecperpix?

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Coastal
sage


Reged: 04/23/09

Loc: Vancouver island, Canada
Re: AstroTortilla vs UniMap for plate solving new [Re: orlyandico]
      #6149655 - 10/21/13 11:05 AM

Quote:

i've been using arcminwidth - but you can also use arcsecperpix?




If I understand correctly, you're using arcminwidth with a range of 0-200. Certainly doesn't sound ideal. Use Pinpoint to calculate your actual image scale and try 0.1 lower and 0.1 higher (ie I use 1.6 and 1.8 for my 1.8"/px scale) using arcsecperpix.


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orlyandico
Postmaster
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Reged: 08/10/09

Loc: Singapore
Re: AstroTortilla vs UniMap for plate solving new [Re: Coastal]
      #6149665 - 10/21/13 11:17 AM

Well Astrometry itself tells me my correct pixel scale. which (was) 2.68"/pixel as opposed to... 2.68"/pixel according to the Starizona calculator (http://starizona.com/acb/ccd/calc_pixel.aspx)

I don't have PinPoint, and I have no interest in Elbrus (you need to set the camera angle correctly every time?!?!?!?!?!) but I will try being very exact.

BTW nice idea with the USB power box.. I went with a similar method (R78B05 DC-DC converter to provide 5V for my USB hub form a battery). Thankfully I don't need 7.5V, but the camera cooler sucks power like there's no tomorrow...


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Moromete
professor emeritus


Reged: 02/15/12

Loc: Romania
Re: AstroTortilla vs UniMap for plate solving new [Re: orlyandico]
      #6149677 - 10/21/13 11:26 AM

Why don't you try Unimap if you are using hints already?

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orlyandico
Postmaster
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Reged: 08/10/09

Loc: Singapore
Re: AstroTortilla vs UniMap for plate solving new [Re: Moromete]
      #6149745 - 10/21/13 12:03 PM

astrometry works for me (if a bit slow), I like their development model (and the fact there's a lot of published research that uses their engine), etc. etc.

the reality is I only do 1-2 slews per session, so that's 1-2 solves per session. 20-second solves barely annoy me. I would like things to go faster, but the current scheme isn't killing me.


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David PavlichAdministrator
Transmographied
*****

Reged: 05/18/05

Loc: Mandeville, LA USA
Re: AstroTortilla vs UniMap for plate solving new [Re: Moromete]
      #6159901 - 10/26/13 10:19 PM

I have an MI250 controlled by SiTech. Since it's an ASCOM driven program, I'll assume that it'll work with this setup. Is there anything that in the SiTech system that may cause a problem with the mount interfacing with AT?

Thanks!

David


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orlyandico
Postmaster
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Reged: 08/10/09

Loc: Singapore
Re: AstroTortilla vs UniMap for plate solving new [Re: David Pavlich]
      #6160064 - 10/27/13 12:54 AM

Dave, not that I know of. AT only knows how to talk to ASCOM (and nothing else) on the mount side, so anything with a working ASCOM driver that supports resyncs will work.

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Raginar
Postmaster
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Reged: 10/19/10

Loc: Rapid CIty, SD
Re: AstroTortilla vs UniMap for plate solving new [Re: orlyandico]
      #6160340 - 10/27/13 08:43 AM

Dave, it works good

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David PavlichAdministrator
Transmographied
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Reged: 05/18/05

Loc: Mandeville, LA USA
Re: AstroTortilla vs UniMap for plate solving new [Re: Raginar]
      #6160524 - 10/27/13 11:00 AM

Quote:

Dave, it works good




That's all I needed to read! Thanks, Chris.

David


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David PavlichAdministrator
Transmographied
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Reged: 05/18/05

Loc: Mandeville, LA USA
Re: AstroTortilla vs UniMap for plate solving new [Re: orlyandico]
      #6160528 - 10/27/13 11:01 AM

Quote:

Dave, not that I know of. AT only knows how to talk to ASCOM (and nothing else) on the mount side, so anything with a working ASCOM driver that supports resyncs will work.




Well, I'll have to download it and give it a try. Thanks for the quick reply!

David


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Raginar
Postmaster
*****

Reged: 10/19/10

Loc: Rapid CIty, SD
Re: AstroTortilla vs UniMap for plate solving new [Re: David Pavlich]
      #6162164 - 10/28/13 10:12 AM

One thing to consider, what are you imaging with? You might try out Sequence Generator Pro. It can use the localized astrometry.net server you install with AT. Free plate solving included with acquisition automation kis really me. And, they're adding dome/roof support this version.

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Gvs
member


Reged: 05/19/11

Loc: Texas
Re: AstroTortilla vs UniMap for plate solving new [Re: Raginar]
      #6176843 - 11/05/13 06:43 AM

It is possible to refactor Astrotortilla to point to http://nova.astrometry.net/ which is up an running.

live dot astronomy dot net has issues.


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