NAME

alignasn -- Change the relative shifts in association file

USAGE

alignasn association

PARAMETERS

asn_dir

calnicb style association file with list of images to be aligned. This image should be a list of direct images.

asn_grism

calnicb style association file with list of images to be aligned. This image should be a list of grism images with a one-to-one correspondence to the list of direct images.

DESCRIPTION

Interactive program to compute relative shifts of images in an association file. The user interactively marks the stars on one direct image. The program first computes approximate shifts from the wcs, and then measures the coordinates of the stars using imcnt. After computing the relative shifts of the direct images, alignasn searches for corresponding grism images for each of the direct images. Corresponding images are those with exactly the same wcs coordinates in the header. The grism association is then updated with the same relative shift measurements as determined from the direct images.

EXAMPLES

TIME REQUIREMENTS

BUGS

SEE ALSO