Документ взят из кэша поисковой машины. Адрес
оригинального документа
: http://www.atnf.csiro.au/computing/software/miriad/doc/tvflag.html
Дата изменения: Unknown Дата индексирования: Sun Apr 10 21:06:12 2016 Кодировка: Поисковые слова: п п р р р р р р р р р р р р р р |
Task: tvflag Purpose: Interactive editing of a UV data set on a TV device. Categories: calibration, uv-data, tv, plotting, display TVFLAG is a MIRIAD task which allows interactive baseline editing of a UV data set. The user should make sure, if the display device is capable of creating menus that the menu program has been loaded ``before'' running this routine (eg. xpanel for the XMTV) - see the User's Guide or Cookbook under TV Devices for details. When this program is run, each baseline is displayed, one at a time, with the x-axis representing channel number (increasing to the right), the y-axis representing the change in time (increasing upward), and the color intensity representing the amplitude or phase (depending on the value of the keyword ``mode'') of the visibility. The current antenna that constitute the baseline are labeled at the bottom of the plot (if room permits). In addition, if room permits, a color wedge is displayed to the right side of the visibility data and is the sum of the data over all displayed channels. Also, a wedge of the sum of the data over all displayed times will appear above (or below) the data as room permits. The user may edit the data in one of two ways: 1) By entering commands at the keyboard; or 2) by selecting commands from the listed menu items. Which method is determined by the presence of a menu program (such as ``XPANEL'' for the Sun systems). If no menu program is currently active, then a message is issued to the user and all commands are prompted from the keyboard. Commands are entered followed by a carriage return (<CR>). Single letter abbreviations are used for all commands. The current command list, each corresponding abbreviation, and a brief description of each command is available by entering a question mark (``?'') as a command. Commands requiring further interaction (eg. ``select'' and ``value'') will prompt the user when they are invoked. If a menu program is active, then TVFLAG will attempt to construct an assortment of menu buttons and other items that will perform the equivalent of entering commands at the keyboard. Certain commands (eg. ``select'' and ``value'') require further cursor input and will prompt the user for a particular action (for example: ``select'' will request the user to select the region to box for further flagging commands). The current technique of editing is to load the baseline to be edited, zoom and pan to the desired location, and then, select the region to be edited followed by an editing command. To identify a region to edit, chose the ``select'' command (or ``channel'' or ``time'' select options) and then use the cursor to box the desired points. To select a desired region, move the cursor (mouse) to a corner of the region to select; identify, to the program, the corner (usually by pushing and holding the left mouse button); move the pointer to the other corner (by dragging the mouse), and then identify, again to the program, the other corner (usually by releasing the left mouse button). After the region to edit has been identified, the selected region may be flagged as good or bad using the appropriate editting command (or button). If data is flagged improperly, the ``undo'' command will reverse the last editing operation. NOTE: If the device does not support this type of ``rubber- band'' selection (Eg. XMTV does; MXAS does not), then the user will be asked to use the cursor to identify two opposite corners to delimit the selected region. To save the editing done to a particular baseline, use the ``exit'' command (or select the ``exit'' button). The flagging changes will be immediately applied to the data. To NOT save the changes made to a particular baseline, use the ``quit'' command (or button). After a ``quit'' or ``exit'' operation, the data for the next baseline is loaded onto the display and the user may continue editing. Selecting the ``abort'' command (button) at any time will perform the same operation as ``quit'', but will also terminate the program. Key: vis The name of the input UV data set. A visibility file name must be supplied. Only one file may be edited at a time. Key: server Standard keyword server. See the help on server for more information. Key: tvchan An integer specifying which TV channel the data is displayed. The default is channel 1. Key: range The minimum and maximum range used in scaling the data on the TV. Default is to autoscale to the first image. If this keyword is used, TWO parameters must be input. Key: tvcorn The integer device coordinate of the lower left corner of the image. The default is to center the image on the display. If this keyword is used and only the x coordinate value is input, the y coordinate value is set to the x value. Key: line Standard keyword line. See the help on line for more information. NOTE: Here ``type'' must be `channel' and the ``width'' and ``step'' parameters must be equal. The default is to display all channels. Key: mode Display ``amplitude'', ``phase'', ``real'', ``imaginary''. By default, ``amplitude'' is selected. For mode=phase, the phase is in degrees. Key: taver The length of time (in minutes) used to average the data when determining the running mean. This is used with the "DIFF" command, where the running mean of the data are subtraced off. Two values can be given for taver, being TTOT and TGAP respectively. If the time interval between any two successive data points is greater than TGAP, or if the total time between the first data point in an average and any succeeding data point exceeds TTOT, then a new average is started. The default for TTOT is 5 minutes, whereas the default TGAP is the value of TTOT. Key: select Standard keyword select. See the help on select for more information. NOTE: The default is to use all visibilities. Key: options Extra processing options. Several can be given, separated by commas. Minimum match is used. Possible values are: nosrc Do not cause a break in the display when the source changes. Normally TVFLAG puts a gap in the display whenever the source changes. Revision: 1.8, 2013/08/30 01:49:21 UTC