Changes/atlod

atlod
Item	Difficulty	Milestone	Time
SamplerStatistics?	easy	6	1d
DataSizeLimits?	easy	6	2d
IdentifyParentWindow?	moderate	8	2*5d
FlaggingWithinATLOD - basics	easy	6	5d
FlaggingWithinATLOD - autoflagging	moderate	9	4*5d
MoreSelectionOptions?	easy	6	5d

SamplerStatistics?

we no longer use these. So we need to avoid checking for them with CABB-type data.

DataSizeLimits?

we need to check for size limits on the data dimensions - number of windows, channels, etc

XYPhaseCalibration?

instead of a single (instrumental) XY phase term, we will now get all the autocorellations. This has the potential to greatly inflate the data volume.

IdentifyParentWindow?

Each spectral window output by the correlator can have some ZoomBands? defined. We think that it will be necessary to keep track of each window's parent window. There should only be 0 or 1 parents.

Whether it is necessary to keep track of the children of a particular band is unclear.

FlaggingWithinATLOD?

atlod does a qualitatively different type of flagging to other parts of Miriad; it drops data from the output instead of just marking it as bad.

There are two possible types of flagging-related changes.

• removal of birdies - there are likely to be some new ones
• possibly using the autocorrelations? to flag data affected by interference.

MoreSelectionOptions?

Probably people will want to atlod just a subset of the data, not the whole thing. This requires more selection options than just 'ifsel'.

StorageOfTsysData?

Now that there are no sampler statistics, we need a different way of carrying along Tsys? data than we have at present. At present there are 24 scalar values (6 antennae * 4 polarizations) written into every integration. In the new system there will likely be a spectrum (instrumental autocorrelations (XX and YY) both with the noise diode on and off).

SYSCALRecordChanges?

The SYSCAL records will change from their current form.

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