Content-type: text/html Manpage of demos

demos

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NAME

demos - Inverse mosaicing operation  

PERSON RESPONSIBLE

rjs  

CATEGORIES

map manipulation  

DESCRIPTION

DEMOS (de-mosaic) is a MIRIAD task which takes a model of the sky (which is primary beam corrected), and then multiplies by a primary beam response function at a number of different pointing centers. It produces a different output for each pointing center. Thus this task performs the inverse of mosaicing. The input pointing centers and the primary beam size are indirectly specified by a visibility dataset.

Because the output of DEMOS have primary beams applied, they can be used for comparison with visibility data and uncorrected images. In particular SELFCAL cannot handle a model which is primary beam corrected, though it can handle a visibility data file containing multiple pointings. Thus you could use DEMOS to break the model into several models which are not primary beam corrected.  

PARAMETERS

map
This is the name of image, that is to be de-mosaiced. No default. The input is primary beam corrected image, single dish image, or one that is partially primary beam corrected (e.g. the output of MOSMEM).
vis
This is one or more input visibility datasets. The pointing centres and primary beams corresponding to the selected visibilities are used in the de-mosaicing process.
select
Normal uv selection. See help on "select". Generally you will select only those pointings of interest.
out
This gives a template name for the output images. The actual output image names are formed by appending a number corresponding to each pointing center to this output name. For example, if out=cygnus, then the output images will be called cygnus1, cygnus2, etc.
imsize
This gives two values, being the output image size, in x and y. If no value is given, then the outputs will be one primary beam width in size. If one value is given, then this is used for both x and y. Each output size might be smaller than this, to prevent each output from extending beyond the edges of the input image.
options
Extra processing options. There is currently only one option.
  detaper    This indicates that the input image is not fully
             primary beam corrected. Such images are formed by
             LINMOS with options=taper or by MOSMEM.


 

Index

NAME
PERSON RESPONSIBLE
CATEGORIES
DESCRIPTION
PARAMETERS

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Time: 18:35:38 GMT, July 05, 2011