mosaicOverlapFactor

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Computes the maximum sensitivity increase factor for an ALMA mosaic. It is similar to mosaicSensitivity, but designed to handle an arbitrary mosaic pattern rather than simply a hexagonal pattern. It sums the response from all pointings that are within the radius of the first null of the pointing under test, and uses the peak response among all pointings. Does not account for flagging or different observing depths at different pointings.

Usage:

au.mosaicOverlapFactor(vis, source='', fwhmfactor=1.13, verbose=False, intent='OBSERVE_TARGET#ON_SOURCE')
Inputs: Returns:
  • A single floating point value for the maximum sensitivity increase factor, which is typically the center of the mosaic but not necessarily so. It is meant to be applied to a theoretical rms computed based on the total time spent on only one of the pointings of the mosaic.

Example:

CASA <4>: au.mosaicOverlapFactor('uid___A002_X99c183_X25b6.ms.split.cal.source',verbose=True)                                                                                                                         
Using frequency = 225.464261 GHz                                                                                                        
Processing 14 fields:  [ 5  6  7  8  9 10 11 12 13 14 15 16 17 18]                                                                      
min separation = 13.547640 arcsec = 0.5246 FWHM                                                                                         
response factor: median = 1.374719, max = 1.534597                                                                                      
  Out[4]: 1.5345969500469543        

-- ToddHunter - 2016-04-04

This topic: ALMA > TWikiUsers > ToddHunter > CasaExtensions > MosaicOverlapFactor
Topic revision: 2016-04-04, ToddHunter
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