Using the Dewarp
Log in and do everything as deep. When you run IRAF (by using "cl"), run
it from the /home/astro10/deep/rknop directory. (Notice that there
is both a deep and a rknop in that directory.) I've set up the
scripts so that that IRAF account will work right with the undistort
software. It may work elsewhere as well. Who knows.
Run it on cha-am or panisse, or a machine on which you are sure we've set
up IRAF correctly.
BTC distortion files are in /home/astro23/deepsearch/rknop/btcdistort. The
files you need are rknopundistort.csh, process_header, and
geomap_newest. Copy those to your working directory.
- Copy the FITS files to your current directory
- Rotate the FITS files properly
- These procedures are done most easily within IDL. In IDL, cd to your
working directory and do:
That will write a copy of the FITS file, properly rotated, to your
current directory. name is the name as found in our
database of the image. rotnumber is 2 for BTC quadrants
1-3, and 5 for BTC quadrant 4.
- Read the .fts files into IRAF
- Use rfits. Write the .imh files to your current directory. The
current directory should have space to deal with this sort of thing.
- Make a list of the .imh files
- In your current directory, do an "ls *.imh > rootlist".
- Run rknopundistort.csh
- Run this from a shell. Do not run it from within IRAF. It
will take time. Several minutes per image to be undistorted,
probably. When it's done, for
each file.imh file you ran through the thing, there
should be a ufile.imh file which is undistorted.
- Write the undistorted files back to FITS.
- Use wfits. Write 16-bit files. Choose your scaling intelligently.
Note that autoscaling may not be a good idea because the spline
fitting in the distortion routines can introduce huge swings in pixel
value when there are saturated objects.
- Properly rotate the undistorted FITS images back to how we keep
- Load the undistorted images into the database.
- These steps are probably easiest done in IDL. Right now, loading the
undistorted images into the database requires hand intervention, and
you should consult Matthew for how it is done.
Matthew and I suggest a suffix "csw" and "cow" for the dewarped
images, where a csw image is a dewarped csg image and a cow image is
a dewarped com image.
- Move the unwarped images where the database can find them.
- Put them in one of the /home/astro*/deepsearch directories which has
- Do subtractions, scanning, etc.
Last modified: Sat Mar 8 17:09:53 1997