138-jitter ATM

[amro]

The ATM lines have jitter of 2 pixels. attached screenshot shows that.
Steve needs to make decision about data delivery as it is ready to be burnt and shipped.

[mggr]

Re: 138, I'd recommend we deliver with a note on the jitter. Steve: could you have a look at the attached png from Amer and see if you agree?

Re: jitter, Br Bill also noted this in some of the new 2007 ATM data:

5. I have georeferenced 2 lines ( files 5 and 9 ), just using the raw AT4 data. The overall referencing is perfect, but there still is the same sync ripple of about 1-2 pixels, like some lines from last year.

It does vary in the image, down the line and it does not appear to be due to scan timing, the first differences of the scan timing is 80 msecs (2sig fig), ie it only varies below the msec level so it seems that it is not a sync timing problem.

It would be useful to see or acquire some 25 and 50 scan data ASAP to check if what we see in this data is just a function of scan rate and turbulence. 

So it's probably likely to come and bite us again..

[mggr]

Br Bill's 2007 ATM with ripple

[mggr]

Shipped with ripple and note - this is apparently a long term issue, but possibly recently solved by equipment relocation, possibly not..