[daip] reading wmap in aips

[Eric Greisen]

Farhad Zadeh wrote:
> I left one of the images on here
> ftp://townes.phys.northwestern.edu/pub/
> 
> The original tar file is here but it is a big one.
> 
> http://lambda.gsfc.nasa.gov/product/map/dr4/maps_band_r9_iqu_7yr_get.cfm
> 
> I may use other regions of the survey as well so it would be good
> to get the geometry right.

I took a look at the one on your ftp site.  There are 4 images each in 
IMAGE extensions in the file.  Their headers are extremely minimal and 
in fact what little the main header says suggests that the data are in 
HEALPIX order/projection not molweide.  There is nothing much that AIPS 
can do with this unless I code MOL projection into AIPS in some way.
That would be a lot of work and I leave for vacation this afternoon.
Perhaps ds9 or some such program that uses the full WCSLIB could read in 
the image in MOL and write it back out in some other projection such as AIT.

Given issues we have with imaging etc I can't see this coordinate 
business rising to a level that I could justify messing up AIPS 
(initially I always create bugs before fixing them in overhauls)
to support projections outside our normal range.  MOL is clearly 
desirable but...

Eric Greisen