From slarson@pirl.lpl.arizona.edu Sat Nov 25 19:51:35 2006 X-Original-To: raugh@icarus.astro.umd.edu Delivered-To: raugh@icarus.astro.umd.edu Delivered-To: raugh@astro.umd.edu Mime-Version: 1.0 (Apple Message framework v752.2) Content-Transfer-Encoding: 7bit From: Steve Larson Subject: SBN PDS Fall Review - typ"?os Date: Sat, 25 Nov 2006 17:51:31 -0700 To: Anne Raugh X-Mailer: Apple Mail (2.752.2) X-Status: X-Keywords: X-UID: 196972 Hi Anne- You mentioned that you wanted typos pointed out before the review. So here are a couple: IHW NNSN Part 5 2986 should be 1986 Deep Impact Mission file, mission overview: second paragraph, line 3; " 4 July 4 2005" should be "4 July 2005". line 4 - "The immediately..." should be "They immediately..." Not a typo, but last sentence in para 1 of mission overview: what is "approach solar angle"? Not the same as phase angle, apparently. 9P/Post-encounter Cruise: last sentence: "There are no from..." "There are no data from..."? -Steve ______________________________________________________________________________ From ma@astro.umd.edu Wed Nov 29 10:10:02 2006 X-Original-To: raugh@icarus.astro.umd.edu Delivered-To: raugh@icarus.astro.umd.edu Delivered-To: raugh@astro.umd.edu Mime-Version: 1.0 (Apple Message framework v752.2) Cc: Ludmilla Kolokolova , Anne Raugh , "Michael F. A'Hearn" Content-Transfer-Encoding: 7bit From: Michael A'Hearn Subject: IHW NNSN images Date: Wed, 29 Nov 2006 10:10:09 -0500 To: Lori Feaga X-Mailer: Apple Mail (2.752.2) X-Status: X-Keywords: X-UID: 197832 Hi Lori, You have done some good work sorting out the orientation of the NNSN images, so I wanted to lay out the direction in which I think we need to move, with cc to Ludmilla and Anne to make sure that everyone is on the same page. 1. Philosophical position: the user should be able to read in an image and have it automatically display as a true image of the sky (not a mirror image), albeit with some arbitrary rotation such that "north" (where that is a sensible direction) is identified (in a keyword) but not neccessarily at the top. This should be true whether the user reads a FITS image or a PDS-labelled image. 2. We know that, in the case of the IHW NNSN images, there was (at least) one Japanese observatory that delivered FITS images with the line display direction having the opposite sense from those delivered by most (all?) other missions. This resulted in their images displaying (with a normal FITS reader into IDL) as a mirror image of the sky instead of the true sky (as most others displayed) and also the orientation keywords in the FITS label that defined the azimuth of the line and sample directions likely being incorrect also. This problem has been known for some time and listed in the errata of the IHW archive, but it was unclear from our records whether the data had actually been corrected or not. From your work, it appears that they have not been corrected. 3. In order to actually correct the errors, we need to make sure that we understand exactly what the problem is, and this has several parts. The first step is make sure that we understand our own readpds routine, and in particular understand how it uses the SAMPLE_DISPLAY_DIRECTION and LINE_DISPLAY_DIRECTION keywords. To make sure that the readpds routine is working correctly, I suggest taking an image with an easily recognized orientation and make a copy with, e.g., LINE_DISPLAY_DIRECTION changed (from UP to DOWN or vice versa). When read with readpds, the two images should display as up- down mirror images of one another. If they aren't, then our own routine is ignoring the keywords. Once readpds is understood, we need to compare the display results with readfits, to make sure that readfits works correctly. I THINK (but am not sure) that the default display direction assumed by most FITS file creators is bottom-to- top. This needs to be checked on images from a variety of sources to be sure that we understand what most people are using, particularly some major observatories like HST, NOAO, etc. Once you understand these issues, we may need to have a small meeting to discuss where we go (probably including Siddarth Tayal). 4. For the IHW NNSN data in particular, you need to check several observatories, including the one that appears to be "wrong" (i.e. different from the others). Once you understand the patterns in these data, we may also need a meeting to discuss where we go. Mike Michael F. A'Hearn Department of Astronomy University of Maryland College Park MD 20742-2421 USA +1 301 405 6076 ______________________________________________________________________________ From ma@astro.umd.edu Wed Nov 29 10:20:45 2006 X-Original-To: raugh@icarus.astro.umd.edu Delivered-To: raugh@icarus.astro.umd.edu Delivered-To: raugh@astro.umd.edu Mime-Version: 1.0 (Apple Message framework v752.2) Cc: Ludmilla Kolokolova , Anne Raugh , "Michael F. A'Hearn" , "Steven M. Larson" Content-Transfer-Encoding: 7bit From: Michael A'Hearn Subject: NNSN contact Date: Wed, 29 Nov 2006 10:20:52 -0500 To: Lori Feaga X-Mailer: Apple Mail (2.752.2) X-Status: X-Keywords: X-UID: 197834 Lori, I forgot to mention in the message that I just sent: you should feel free to contact Steve Larson for advice (cc on this message). He was the NNSN discipline scientist for the IHW and knows more about those data than anyone. Mike Michael F. A'Hearn Department of Astronomy University of Maryland College Park MD 20742-2421 USA +1 301 405 6076 ______________________________________________________________________________ From feaga@astro.umd.edu Wed Nov 29 11:48:05 2006 X-Original-To: raugh@icarus.astro.umd.edu Delivered-To: raugh@icarus.astro.umd.edu Delivered-To: raugh@astro.umd.edu Date: Wed, 29 Nov 2006 11:48:05 -0500 (EST) From: Lori Feaga To: Anne Raugh Cc: Michael A'Hearn , Ludmilla Kolokolova , Stephanie McLaughlin Subject: another lien for the IHW NNSN data set MIME-Version: 1.0 X-Status: A X-Keywords: X-UID: 197855 Ann, As I was looking at the image orientation issue for some of the data in the NNSN dataset and scrutinizing the labels while trying to get readpds to work on my PC, Stef and I noticed that the pointers for fits_header and image in the data label files have the extension of "HDR" where they should have "FIT". These need to be fixed in all of the data label files. Lori -- Lori M. Feaga Research Associate Department of Astronomy University of Maryland College Park, MD 20742 (301)-405-1383 feaga@astro.umd.edu ______________________________________________________________________________ From feaga@astro.umd.edu Thu Jan 11 17:43:12 2007 X-Original-To: raugh@icarus.astro.umd.edu Delivered-To: raugh@icarus.astro.umd.edu Delivered-To: raugh@astro.umd.edu Date: Thu, 11 Jan 2007 17:43:11 -0500 (EST) From: Lori Feaga To: Anne Raugh Cc: Michael A'Hearn , Ludmilla Kolokolova , Stephanie McLaughlin , slarson@pirl.lpl.arizona.edu Subject: PDS-SBN IHW NNSN Lien from November Review MIME-Version: 1.0 X-Status: X-Keywords: X-UID: 206658 January 11, 2007 IHW NNSN Image Orientation Lien Resolution (with an additional issue identified) (Initiated Fall Review--Nov. 27, 2006) *Parties involved: Lori Feaga (Reviewer) Steve Larson (Reviewer and Halley Data Expert) Mike A'Hearn (PDS-SBN Node Manager and Halley Data Expert) Ludmilla Kolokolova (PDS-SBN Manager) Anne Raugh (PDS-SBN data engineer) Stef McLaughlin (PDS-SBN data engineer) *Data involved: IHW Near Nucleus Studies Net, Images http://pdssbn.astro.umd.edu/holdings/ihw-c-nnsn-3-edr-halley-v2.0/data/ *Lien introduced on Nov. 27, 2006: -Japanese group identified as Watanabe et al. have incorrect image orientation (East is 90 degrees clockwise from North rather than 90 degrees counterclockwise from North) in FITS files -All files by this observer were checked (both Okayama and Dodaira Observatories, 164 image files) and all had incorrect orientation -Comparison to other observers/observatories were made +Correct orientation in all other FITS files sampled -Resolution to be adopted (per A'Hearn private communication 01/2007) +Fix the Watanabe et al. FITS files such that there is a top/bottom flip so that orientation is consistent in all data +Check position angle note in .LBL file and keyword "CROTA1" in FITS header for Watanabe et al. data once flip is completed *Issue identified by L. Feaga while sorting this out: -PDS IDL tool "readpds" default displays FITS files with (0,0) at the top left instead of the conventional bottom left -.LBL files for all of the NNSN data also direct "readpds" to read FITS data from top to bottom and left to right with keywords: LINE_DISPLAY_DIRECTION = "DOWN" SAMPLE_DISPLAY_DIRECTION = "RIGHT" -Suggested resolution +Change "readpds" default AND +Change label file keyword LINE_DISPLAY_DIRECTION to "UP" for all NNSN files +Note that the FITS files themselves are fine L. Feaga has a list of the Watanabe et al. files and has display examples. Please contact her at feaga@astro.umd.edu or see her directly (for you local UMD folks) for any clarification. Thanks, Lori -- Lori M. Feaga Research Associate Department of Astronomy University of Maryland College Park, MD 20742 (301)-405-1383 feaga@astro.umd.edu ______________________________________________________________________________ From ma@astro.umd.edu Thu Jan 11 18:31:04 2007 X-Original-To: raugh@icarus.astro.umd.edu Delivered-To: raugh@icarus.astro.umd.edu Delivered-To: raugh@astro.umd.edu To: feaga@astro.umd.edu, Anne Raugh Subject: Re: PDS-SBN IHW NNSN Lien from November Review Cc: Michael A'Hearn , Ludmilla Kolokolova , Stephanie McLaughlin , slarson@pirl.lpl.arizona.edu Reply-To: ma@astro.umd.edu X-Mailer: [XMailTool v3.1.2b] Date: Thu, 11 Jan 2007 18:31:04 -0500 (EST) From: ma@astro.umd.edu (Michael A'Hearn) X-Status: X-Keywords: X-UID: 206667 Content-Length: 551 I agree with almost everything Lori says. I note that the normal PDS default for images is to have 0,0 in the top left corner. Thus changing the default for readpds to be anything else, seems wrong. Changing it only for FITS images could be ok. Mike ================================================================== Michael F. A'Hearn email: ma@astro.umd.edu Department of Astronomy tel: +1 301 405 6076 University of Maryland fax: +1 301 405 3538 College Park MD 20742-2421 ______________________________________________________________________________ From slarson@pirl.lpl.arizona.edu Thu Jan 11 20:20:17 2007 X-Original-To: raugh@icarus.astro.umd.edu Delivered-To: raugh@icarus.astro.umd.edu Delivered-To: raugh@astro.umd.edu Mime-Version: 1.0 (Apple Message framework v752.2) Cc: Anne Raugh , Ludmilla Kolokolova , Stephanie McLaughlin Content-Transfer-Encoding: 7bit From: Steve Larson Subject: Re: PDS-SBN IHW NNSN Lien from November Review Date: Thu, 11 Jan 2007 18:20:25 -0700 To: Lori Feaga , "Michael A'Hearn" X-Mailer: Apple Mail (2.752.2) X-Status: X-Keywords: X-UID: 206690 Lori- Glad you found the offending images. Did you use the motion of the comet relative to the stars help determine the correct orientation? I will check my notes tomorrow to see if these were digitized films, which would help explain the source of the error. As I recall, if two keywords (crota1, can't remember the second one) are correct, DS9 will correctly indicate direction in the sky in its pan window. Mike - just curious as to why the PDS uses the upper left corner (as displayed how?) as the origin? Is increasing X and Y to the right and down? Cheers, -Steve PS- Just saw Comet McNaught from my rooftop naked eye through the Tucson murk. Just beautiful..... ______________________________________________________________________________ From slarson@pirl.lpl.arizona.edu Tue Jan 16 17:23:15 2007 X-Original-To: raugh@icarus.astro.umd.edu Delivered-To: raugh@icarus.astro.umd.edu Delivered-To: raugh@astro.umd.edu Mime-Version: 1.0 (Apple Message framework v752.2) Cc: "Michael A'Hearn" , Anne Raugh , Ludmilla Kolokolova , Stephanie McLaughlin Content-Transfer-Encoding: 7bit From: Steve Larson Subject: Re: PDS-SBN IHW NNSN Lien from November Review Date: Tue, 16 Jan 2007 15:23:31 -0700 To: Lori Feaga X-Mailer: Apple Mail (2.752.2) X-Status: X-Keywords: X-UID: 207448 Lori- I looked back at my records for the Watanabe images, and they were CCD or digitized plates. Most of my notes related to errors in the format of some header values and observer names, so there was a bunch of manual corrections needed, but no mention of the orientation problem. We totally missed that ....... -Steve On Jan 12, 2007, at 7:57 AM, Lori Feaga wrote: > >> Glad you found the offending images. Did you use the motion of the >> comet relative >> to the stars help determine the correct orientation? > > Yes, I used the background stars and tail direction and orientation > in consecutive hours or nights to determine the correct orientation. > > Lori ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________