[daip] Issues with SPIXR

[Eric Greisen]

On 10/15/2013 11:48 AM, Sayali Avachat wrote:
> Hi
>
> I am trying to task SPIXR work. I have a cube made from 2 freq maps 
> and I want to find the spectral index map from it. When I do not use 
> the blc trc values, this task apparently works fine (though I am not 
> sure if the spectral index calculated is correct, because the values 
> that I get by doing calculations on calculator are different than the 
> ones in header).
> Now when I try to restrict the region using blc trc, it gives me 
> following error msg -
>
> SPIXR1: Task SPIXR  (release of 31DEC12) begins
> SPIXR1: REQUESTED SUBIMAGE AT LEAST PARTLY OUTSIDE THE IMAGE:
> SPIXR1: INCORRECT BLC    741.   407.     1.     1.     1.     1.     1.
> SPIXR1: INCORRECT TRC      2.   511.     1.     1.     1.     1.     1.
> SPIXR1: Purports to die of UNNATURAL causes
>
> input blc trc values are - BLC=  741 407 1 1 1 1 1; TRC= 945 511 1 1 1 
> 1 1, as you can see the blc values are accepted but trc values as seen 
> by the task are wrong.
> Also I am using defaults for flux, optype, pbparm and dparm.
>
> Why does this happen?
>

I believe that SPIXR requires a 3-dimensional image with the spectral 
axis first.  You want
blc = 1,741,407; trc=2,945,511 since the 2 spatial axes are axes 2 and 3.

Eric Greisen