[daip] cross-correlation of theoretical images

[algaba]

Dear Eric, 

After using gethead and puthead in this way the task
CONVL worked perfectly. 

Thank you for the explanations. 

Regards, 


J. C. Algaba 

On Mon, 23 Apr 2012 17:02:22 -0600, Eric Greisen wrote:


> Juan-Carlos Algaba-Marcos wrote:
> 
>> To whom it may concern, I am
lately working on task CONVL with theoretical and observed images.
Currently I want to obtain the cross-correlation of a theoretical model
and the corresponding synthesized 'observed' one. (OPCODE='IMAC')
However, when I try to do so I obtain the following error: localh>
CONVL1: CONFIL: UNEQUAL SPACINGS IN TWO MAPS localh> CONVL1: IMAGE=
0.0000 0.0000 CONV. FN= 0.0000 0.0000 localh> CONVL1: Destroyed MA image
file: catno= 39 disk= 2 localh> CONVL1: Purports to die of UNNATURAL
causes localh> CONVL1: localhost 31DEC11 TST: Cpu= 0.0 Real= 0 As the
first image is a model, I have removed the blanks with task REMAG and
adjusted all values to match the observed image with PUTHEAD. Here are
the headers of both input images:
> 
> IMHEADER does not display the
axis increments with enough accuracy to 
> see what CONVL is complaining
about. It checks that the increments are 
> the same to 5% and they are
not. Try keyword='cdelt1'; gethead on one 
> image and then puthead on
the other. Repeat with keyword='cdelt2'.
> That should get us past the
above error.
> 
> It is true that when you convolve with a Gaussian is
scales correctly to 
> produce Jy/beam from Jy/pixel and it should
therefore change the header 
> units. keyword='bunit'; keystr='jy/beam';
puth will fix that. I will 
> look at correcting the code (in 31DEC12
version).
> 
> OHGEO is intended to interpolate an image to the
coordinates of the 2nd 
> image - your two are half-way across the sky
from each other and so that 
> is a meaningless operation (all blanks
out results).
> 
> Eric Greisen

  
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