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: http://www.naic.edu/~ages/pos_mon
Дата изменения: Mon Nov 22 21:13:28 2004
Дата индексирования: Mon Oct 1 19:59:30 2012
Кодировка:
Поисковые слова: deep sky
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pos_mon - IDL suite for monitoring LEAPFROG observations
pos_mon - IDL suite for monitoring LEAPFROG observations
pos_mon includes two simple gui systems which allow monitoring of the leapfrog obseving progress: the cunningly named beamtrack_plot and beampos_plot.
Specifically, they are optimised to report the accuracy of the repetition of 'leaps' tracks in AZ and EL, and to show the result of interleaving pointing positions on the sky. Essentially, they show the data positions as a function of AZ and EL, and also as RA and Dec.
To run pos_mon at Arecibo:
- If you are using the AGES account, simply type pos_mon at
the command prompt
- If you are not using the AGES account, start IDL (type idl at
the command prompt) then enter the following commands:
- IDL> addpath,'/share/ages/IDLSTUFF'
- IDL> beamtrack_plot&beampos_plot
Two guis ensue.These are shown in the nifty gifs below: Superficially, they look almost identical, owing to the chic grey patina and Hip Roman font, however, a well-trained AGES observes is sure to never be confused. Not Ever. We are Hipper than that.
Beamtrack_plot:
Beampos_plot:
Thankfully, the process to operate the two programs is virtually identical. The 'Filter' window can be modified to reflect and subselect the files containing the data for plotting. Normal UNIX wildcards work. Click 'update' to query the directory and obtain a refreshed file listing.
The files are selected and deselected by mouseclick. Multiple files can be selected, non-contiguous files can be selected by holding 'ctrl' while clicking on the file name.
'Plot now' will plot the data positions, for ALL integrations in the selected files.
Neither of these tasks can be reliably used for data that is being actively written i.e. the data should be closed, or the programs might barf. The solution for fast data monitoring? Don't write moronically big files. IDL does not cope very well with multi-gigabyte files anyhow, or take your chances and click 'Plot now'.
The tasks detect if a file appears to be empty (simply by querying the size of the file), and will skip it
Is is sometimes necessary to change the scaling on the AZ-EL track plots, to obtain a better look at the accuracy of track repetitions. The 'AZ range [deg]' and 'ZA range [deg]' boxes are used to select these ranges. Take care to do what the gui says and use (only two values) comma separated values.
The numeration in the bottom panel of beamtrack_plot show position of the first integration for beam 0 in the file. This will be a fascinating single point if you have only entered one datafile. Which is another good reason to implement some intelligent book-keeping and write one file per source.
Both tasks have to wade through a lot of data, give it time. Both tasks give you a progress or status update.
Page written by Erik Muller (emuller (at) naic . edu), Nov 22nd 2004