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: http://www.atnf.csiro.au/computing/software/miriad/doc/demos.html
Дата изменения: Unknown Дата индексирования: Sun Apr 10 19:46:41 2016 Кодировка: Поисковые слова: cygnus |
Task: demos Purpose: Inverse mosaicing operation Categories: map manipulation DEMOS (de-mosaic) is a MIRIAD task that takes a model of the sky (that is primary beam corrected), and 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 that 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. Key: map This is the name of the image to be de-mosaiced. A primary beam corrected image, single dish image, or one that is partially primary beam corrected (e.g. the output of MOSMEM). No default. Key: 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. Key: select Normal uv selection. See help on select. Generally you will select only those pointings of interest. Key: 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. Key: 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. Key: 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. Revision: 1.8, 2014/05/21 04:34:59 UTC