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"""
skyline -- Manage outlines on the sky
This module provides support for working with footprints on the sky.
Primary use case would use the following generalized steps::
1. Initialize SkyLine objects for each input image. This object would be the
union of all the input image's individual chips WCS footprints.
2. Determine overlap between all images. The determination would employ a
recursive operation to return the extended list of all overlap values
computed as [img1 vs [img2,img3,...,imgN],img2 vs [img3,...,imgN],...]
3. Select the pair with the largest overlap, or the pair which produces the
largest overlap with the first input image. This defines the initial
reference SkyLine object.
4. Perform some operation on the 2 images: for example, match sky in intersecting
regions, or aligning second image with the first (reference) image.
5. Update the second image, either apply the sky value or correct the WCS, then
generate a new SkyLine object for that image.
6. Create a new reference SkyLine object as the union of the initial reference
object and the newly updated SkyLine object.
7. Repeat Steps 2-6 for all remaining input images.
This process will work reasonably fast as most operations are performed using
the SkyLine objects and WCS information solely, not image data itself.
"""
import pyfits
import sphere
class SkyLine(object):
def __init__(self,fname):
pass
def add_image(self,skyline):
pass
def compute_overlap(self, skyline):
pass
def find_intersection(self, skyline):
pass
def within(self, pos):
pass
def create_wcs(self):
pass
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