Fact-finding about turbulence codes for the atmosphere module

[barnabytprowe]

Soon we're going to have a reasonable spattering of atmospheric-type PSFs, including Moffats, Double Gaussians and Kolmogorov (#105).

However, one aim of the project was to generate truly stochastic PSFs via modelling the propagation of photons though models of the atmosphere, possibly using multiple layer models.

Joerg and Barney are going to be doing some factfinding about this for the next milestone, and will report more on this issue (and perhaps put together a document).

[barnabytprowe]

Some codes that Joerg and Barney found to take an initial look at (anyone who knows of other public codes, please list them on this issue too!):

http://cfao.ucolick.org/software/arroyo.php

http://lao.ucolick.org/data/Pyramid/MTF%20Data/Code/LAOPack/LAO/pro/simulationAnalysisTools.html

(in the latter the download link is broken, but you can navigate up the parent directory structure of the URL and find the IDL .pro files)

[joergdietrich]

I looked at the IDL code quite a bit now and read through bits of the Arroyo docs. Should we have quick Skype call about this, or how do you want to proceed?

[barnabytprowe]

Hi Joerg,

Yes, I think a quick skype call sounds like a good idea... I've also been doing some reading of those docs and a little more generally. I was starting to put together materials for a brief (1-2 page) latex document outlining the basic issues and possible approaches we could take. These ideas and notes are all I have currently, though, not yet actual .tex.

Obviously, time is running a little short now, but I think we can bring something together. I realise you're on German time now, would you like to speak sometime tomorrow afternoon? I could do 8am PDT / 5pm CEST if that's convenient? In the meantime, I'll put together my notes...

Barney

As you are on German time,

On 20 Jun 2012, at 04:44, Jörg Dietrich wrote:

I looked at the IDL code quite a bit now and read through bits of the Arroyo docs. Should we have quick Skype call about this, or how do you want to proceed?

---

Reply to this email directly or view it on GitHub: https://github.com/GalSim-developers/GalSim/issues/169#issuecomment-6451514

Barnaby Rowe

Jet Propulsion Laboratory California Institute of Technology MS 169-237 4800 Oak Grove Drive Pasadena CA 91109 United States of America

Department of Physics & Astronomy University College London Gower Street London WC1E 6BT United Kingdom

[joergdietrich]

Hi Barney,

I'll be at a colloquium in Garching at that time. Would 10am/7pm work for you?

-- Joerg

On Wed, Jun 20, 2012 at 09:05:51AM -0700, Barnaby Rowe wrote:

Hi Joerg,

Yes, I think a quick skype call sounds like a good idea... I've also been doing some reading of those docs and a little more generally. I was starting to put together materials for a brief (1-2 page) latex document outlining the basic issues and possible approaches we could take. These ideas and notes are all I have currently, though, not yet actual .tex.

Obviously, time is running a little short now, but I think we can bring something together. I realise you're on German time now, would you like to speak sometime tomorrow afternoon? I could do 8am PDT / 5pm CEST if that's convenient? In the meantime, I'll put together my notes...

Barney

As you are on German time,

On 20 Jun 2012, at 04:44, Jörg Dietrich wrote:

I looked at the IDL code quite a bit now and read through bits of the Arroyo docs. Should we have quick Skype call about this, or how do you want to proceed?

---

Reply to this email directly or view it on GitHub: https://github.com/GalSim-developers/GalSim/issues/169#issuecomment-6451514

Barnaby Rowe

Jet Propulsion Laboratory California Institute of Technology MS 169-237 4800 Oak Grove Drive Pasadena CA 91109 United States of America

Department of Physics & Astronomy University College London Gower Street London WC1E 6BT United Kingdom

---

Reply to this email directly or view it on GitHub: https://github.com/GalSim-developers/GalSim/issues/169#issuecomment-6459019

Jörg Dietrich dietrich@usm.lmu.de Universitäts-Sternwarte Tel. +49 89 2180 5942 Scheinerstr. 1 Fax +49 89 2180 6003 81679 München, Germany

[barnabytprowe]

Perfect, we'll speak then!

On 20 Jun 2012, at 09:25, Jörg Dietrich wrote:

Hi Barney,

I'll be at a colloquium in Garching at that time. Would 10am/7pm work for you?

-- Joerg

On Wed, Jun 20, 2012 at 09:05:51AM -0700, Barnaby Rowe wrote:

Hi Joerg,

Yes, I think a quick skype call sounds like a good idea... I've also been doing some reading of those docs and a little more generally. I was starting to put together materials for a brief (1-2 page) latex document outlining the basic issues and possible approaches we could take. These ideas and notes are all I have currently, though, not yet actual .tex.

Obviously, time is running a little short now, but I think we can bring something together. I realise you're on German time now, would you like to speak sometime tomorrow afternoon? I could do 8am PDT / 5pm CEST if that's convenient? In the meantime, I'll put together my notes...

Barney

As you are on German time,

On 20 Jun 2012, at 04:44, Jörg Dietrich wrote:

I looked at the IDL code quite a bit now and read through bits of the Arroyo docs. Should we have quick Skype call about this, or how do you want to proceed?

---

Reply to this email directly or view it on GitHub: https://github.com/GalSim-developers/GalSim/issues/169#issuecomment-6451514

Barnaby Rowe

Jet Propulsion Laboratory California Institute of Technology MS 169-237 4800 Oak Grove Drive Pasadena CA 91109 United States of America

Department of Physics & Astronomy University College London Gower Street London WC1E 6BT United Kingdom

---

Reply to this email directly or view it on GitHub: https://github.com/GalSim-developers/GalSim/issues/169#issuecomment-6459019

Jörg Dietrich dietrich@usm.lmu.de Universitäts-Sternwarte Tel. +49 89 2180 5942 Scheinerstr. 1 Fax +49 89 2180 6003 81679 München, Germany

---

Reply to this email directly or view it on GitHub: https://github.com/GalSim-developers/GalSim/issues/169#issuecomment-6459623

Barnaby Rowe

Jet Propulsion Laboratory California Institute of Technology MS 169-237 4800 Oak Grove Drive Pasadena CA 91109 United States of America

Department of Physics & Astronomy University College London Gower Street London WC1E 6BT United Kingdom

[barnabytprowe]

Hi Joerg,

I've pushed a few pages of draft. Very sorry, not quite yet finished (it's a bit patchy) so would welcome comments and particularly, if possible, a little fleshing out near the end where I've currently only got fairly empty bullet points. Spent too long trying to get the science down, and in the end wasn't even very happy with that (needs some checks and definitely some better refs)!

Do what you can (no worries if that's not much) and I'll try and do something more with it tomorrow. On the positive side, I think we agree that this modelling is far from intractable and we can probably get something half decent working fairly quickly ourselves.

[joergdietrich]

Not much, indeed, but I added a few sentences about the time step requirement for adding the instantaneous PSFs to get the time averaged one, and made some minor mods.

[barnabytprowe]

Thank you Joerg! Making some edits myself in the cold light of day, I'll let you know when I'm done and then I'll set up a pull request to get comments.

[barnabytprowe]

Hi Joerg. I've pushed a slightly modified draft. I made some minor changes, fixed some typos in my changes and overall, and made the conclusions section paragraphs rather than bullet points - seemed to make sense once I'd added a bit more detail. I will setup a pull request later in the day. Thank you for all your help with this, I think it was a valuable exercise.

[barnabytprowe]

Pull request merged.