MSCTPEAK and the ZPN projection
Thomas de Boer wrote on Jun 18, 2009
Hi everyone,
I am currently reducing some MOSAIC II data taken with the CTIO 4m telescope. Since the FOV is soo big we have to get the best possible WCS in order to resample the image to a new grid of equal pixel size. Therefore, we first fitted a new TNX projection using MSCTPEAK with no problems encountered.
Now, it seems our results can be approved by using the ZPN projection instead of the TNX. Therefore, I updated IRAF to the latest version (2.14.1) which supports the ZPN projection. I am working on a mac running OSX 10.4.11 (Tiger). I even installed the IRAF ZPN patch from the Cambridge Astronomical Survey Unit.
I run MSCTPEAK with the following parameters:
Image Reduction and Analysis Facility
PACKAGE = mscfinder
TASK = msctpeak
images = n5180merge.fits List of WCS calibrated Mosaic images
coordina= compcat List of ra(hr), dec(deg), optional id
database= zpn.db Database for astrometric fit
(extname= ) Extensions
(epoch = 2000.) Coordinate epoch
(update = yes) Update image header WCS following fit?
(autocen= no) Center catalog coords when entering task?
(boxsize= 9) Centering box fullwidth
(project= zpn) Sky projection geometry
(fitgeom= general) Fitting geometry
(functio= polynomial) Surface type
(xxorder= 3) Order of xi fit in x
(xyorder= 3) Order of xi fit in y
(xxterms= half) Xi fit cross terms type
(yxorder= 3) Order of eta fit in x
(yyorder= 3) Order of eta fit in y
(yxterms= half) Eta fit cross terms type?
(reject = INDEF) Rejection limit in sigma units
(interac= yes) Enter interactive image cursor loop?
(frame = 1) Display frame number
(marker = circle) Marker type
(omarker= plus) Overlay marker type
(goodcol= blue) Color of good marker
(badcolo= red) Color of bad marker
(fdimage= )
(fdcoord= )
(mode = q)
Everything proceeds as normal until I hit the 'f' key to fit the projection. The the following error message occurs:
ERROR: WFT_ZPN_INIT: The polynomial is undefined
"graphics=graphics, cursor=cursor)"
line 209: mscfinder$tpltsol.cl (hidden task)
called as: `tpltsol (image=n5180merge.fits[im1], table=tmp$iraf450w, database=zpn.db, imupdate=yes, tabupdate=yes, refitcat=yes, dssheader=no, ra_ref=01:00:04.65, dec_ref=-33:41:33.00, eq_ref=2000.)'
called as: `tpeak (image=n5180merge.fits[im1], table=tmp$iraf450w, database=zpn.db, objects=, ra_ref=01:00:04.65, dec_ref=-33:41:33.00, eq_ref=2000., update=yes, interactive=yes, autocenter=no, autodisplay=no, boxsize=9, xscale=100., yscale=100., xshift=0, yshift=0, reselect=yes, subsample=1, frame=1, marker=circle, omarker=plus, goodcolor=blue, badcolor=red)'
"goodcolor=goodcolor, badcolor=badcolor)"
line 172: mscfinder$msctpeak.cl
called as: `msctpeak (mode=h)'
I have tried updating all packages involved, but I am running out of ideas. Does anyone have any insights as to what is going on?
Any thought at all are greatly appreciated.
-Thomas de Boer
I am currently reducing some MOSAIC II data taken with the CTIO 4m telescope. Since the FOV is soo big we have to get the best possible WCS in order to resample the image to a new grid of equal pixel size. Therefore, we first fitted a new TNX projection using MSCTPEAK with no problems encountered.
Now, it seems our results can be approved by using the ZPN projection instead of the TNX. Therefore, I updated IRAF to the latest version (2.14.1) which supports the ZPN projection. I am working on a mac running OSX 10.4.11 (Tiger). I even installed the IRAF ZPN patch from the Cambridge Astronomical Survey Unit.
I run MSCTPEAK with the following parameters:
Image Reduction and Analysis Facility
PACKAGE = mscfinder
TASK = msctpeak
images = n5180merge.fits List of WCS calibrated Mosaic images
coordina= compcat List of ra(hr), dec(deg), optional id
database= zpn.db Database for astrometric fit
(extname= ) Extensions
(epoch = 2000.) Coordinate epoch
(update = yes) Update image header WCS following fit?
(autocen= no) Center catalog coords when entering task?
(boxsize= 9) Centering box fullwidth
(project= zpn) Sky projection geometry
(fitgeom= general) Fitting geometry
(functio= polynomial) Surface type
(xxorder= 3) Order of xi fit in x
(xyorder= 3) Order of xi fit in y
(xxterms= half) Xi fit cross terms type
(yxorder= 3) Order of eta fit in x
(yyorder= 3) Order of eta fit in y
(yxterms= half) Eta fit cross terms type?
(reject = INDEF) Rejection limit in sigma units
(interac= yes) Enter interactive image cursor loop?
(frame = 1) Display frame number
(marker = circle) Marker type
(omarker= plus) Overlay marker type
(goodcol= blue) Color of good marker
(badcolo= red) Color of bad marker
(fdimage= )
(fdcoord= )
(mode = q)
Everything proceeds as normal until I hit the 'f' key to fit the projection. The the following error message occurs:
ERROR: WFT_ZPN_INIT: The polynomial is undefined
"graphics=graphics, cursor=cursor)"
line 209: mscfinder$tpltsol.cl (hidden task)
called as: `tpltsol (image=n5180merge.fits[im1], table=tmp$iraf450w, database=zpn.db, imupdate=yes, tabupdate=yes, refitcat=yes, dssheader=no, ra_ref=01:00:04.65, dec_ref=-33:41:33.00, eq_ref=2000.)'
called as: `tpeak (image=n5180merge.fits[im1], table=tmp$iraf450w, database=zpn.db, objects=, ra_ref=01:00:04.65, dec_ref=-33:41:33.00, eq_ref=2000., update=yes, interactive=yes, autocenter=no, autodisplay=no, boxsize=9, xscale=100., yscale=100., xshift=0, yshift=0, reselect=yes, subsample=1, frame=1, marker=circle, omarker=plus, goodcolor=blue, badcolor=red)'
"goodcolor=goodcolor, badcolor=badcolor)"
line 172: mscfinder$msctpeak.cl
called as: `msctpeak (mode=h)'
I have tried updating all packages involved, but I am running out of ideas. Does anyone have any insights as to what is going on?
Any thought at all are greatly appreciated.
-Thomas de Boer
Francisco Valdes wrote on Jun 18, 2009
Hello Thomas,
Because the ZPX/ZPN require a model, the radial polynomial, a "kludge" for specifying the projection was made to allow IRAF tasks that take a projection specification to work. I say it is a kludge because it is a little inobvious. The way it works is that when there is a "projection" parameter, such as in ccmap or msctpeak, you provide a filename that contains the projection type (e.g. zpx) and the coefficients. The following is such a file and, since you are using CTIO data, it is a recent one I made for this data for the MOSAIC pipeline.
Note that the WCS fitting code does not modify these radial terms. It does determine distortion terms to handle the distortions. The reason why ZPX is better than TNX is that the radial model takes out most of the actual optical distortion and so the additional distortion coefficients can be smaller and have less instability.
I am also attaching a WCS database for CTIO Mosaic data which you can use with mscsetwcs to initialize a CTIO MEF (16-amp) with a WCS that will be a starting point for refining the WCS.
Yours,
Frank Valdes</ul></ul>
Because the ZPX/ZPN require a model, the radial polynomial, a "kludge" for specifying the projection was made to allow IRAF tasks that take a projection specification to work. I say it is a kludge because it is a little inobvious. The way it works is that when there is a "projection" parameter, such as in ccmap or msctpeak, you provide a filename that contains the projection type (e.g. zpx) and the coefficients. The following is such a file and, since you are using CTIO data, it is a recent one I made for this data for the MOSAIC pipeline.
zpx
projp0 0.
projp1 1.
projp2 0.
projp3 337.74
projp4 0.
projp5 632052.
Note that the WCS fitting code does not modify these radial terms. It does determine distortion terms to handle the distortions. The reason why ZPX is better than TNX is that the radial model takes out most of the actual optical distortion and so the additional distortion coefficients can be smaller and have less instability.
I am also attaching a WCS database for CTIO Mosaic data which you can use with mscsetwcs to initialize a CTIO MEF (16-amp) with a WCS that will be a starting point for refining the WCS.
# WCSASTROM = ct4m.20080303T084421-R by F. Valdes 2008-05-01
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# Thu 17:27:07 01-May-2008
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Yours,
Frank Valdes</ul></ul>
Thomas de Boer wrote on Jun 18, 2009
Hi Frank,
sorry for taking a while to reply. I just got back from holiday. I did not realize an actual file was needed for the zpx/zpn to work. I will give it another shot with the help you provided.
Thanks a lot for the WCS database!
-Thomas de Boer
sorry for taking a while to reply. I just got back from holiday. I did not realize an actual file was needed for the zpx/zpn to work. I will give it another shot with the help you provided.
Thanks a lot for the WCS database!
-Thomas de Boer
Last post on Jun 18, 2009