[daip] UVCON / UVPLT issues

[Ian Heywood]

Dear Leonia, Eric,

Many thanks for the swift replies. By examining the UVPRT lists I'm 
satisfied that no simulated visibilities at negative elevations are being 
included, and by using a suitable REFANT/ANTENNA pairing in UVPLT I can 
get elevation vs. time tracks which look correct.

I still get points at negative elevations but, as per Eric's comment, I'm 
assuming that these are just corresponding to what a particular station 
would have been doing at the time and do not give rise to corresponding 
visibilities.

The plots I initially sent however were created using identical inputs for 
UVPLT; all I changed was the UV data set at the input. I'm still confused 
as to why in the old UVCON case I get the various traces that arise from 
each antenna, whereas in the new UVCON case I'm either getting a single 
plot or they are all identical and overlap each other at the same 
points... This is not critical though.

Hope this makes sense!

Thanks again,
-Ian


On Fri, 25 May 2007, Eric Greisen wrote:

> Actually the plot on the left was made with refant=0 whilst the one on
> the right was made with refant=some non-zero value.  UVPLT then plots
> all samples at the elevation that that refant would have at the time
> - which can certainly be negative in a global array.
>
> Eric Greisen
>