This page (revision-9) was last changed on 27-Mar-2020 14:38 by Peter Young

This page was created on 24-Feb-2010 18:22 by PeterYoung

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Version Date Modified Size Author Changes ... Change note
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8 07-Dec-2016 14:14 1 KB Peter Young to previous | to last
7 04-Aug-2010 21:41 2 KB PeterYoung to previous | to last
6 07-Jul-2010 20:01 2 KB PeterYoung to previous | to last
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After calibrating the data with eis_prep we are now ready to read the data into IDL. Setting:
After calibrating the data with eis_prep we are now ready to read the data into IDL. First set the filename:
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To read an EIS FITS file from the command line, type:
Now to read the EIS FITS file from the command line, type:
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data is an IDL object. You can extract information from the object using various methods. E.g.,
data is an IDL object. Information is extracted from the object through a large number of ''methods'' and some examples are given below.
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To determine the coordinates of the center of the raster, do:
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IDL> exp=data->getexp()
IDL> xpos=data->getxpos()
IDL> wd0=data->getvar(0)
IDL> xcen=data->getxcen(/raster)
IDL> ycen=data->getxcen(/raster)
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wd0 is a 3D array containing the window data for the specified window (0 in this case). You can get a list of all methods by doing:
To find the exposure time for each exposure of the raster, do:
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IDL> data->display_methods
IDL> exp=data->getexp()
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To extract the header into a string array, do:
A single data window can be extracted by doing:
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IDL> hdr_obj=data->gethdr()\\
IDL> text=hdr_obj->getbte_hdr()
IDL> wd=data->getvar(195.12)
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A number of useful header tags can be sent to a structure by doing:
where the specified wavelength is used to pick out the data window containing that particular wavelength. The first dimension of WD is always wavelength, the second is always solar-Y, and the third can be either solar-X or time depending if the observation was a raster or a sit-and-stare observation.
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A complete list of methods is obtained by doing
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IDL> eis_get_hdr_struc,data,hdrstr
IDL> data->display_methods
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To find which wavelength windows are contained in data, do:
while more [detailed information on some methods|EISmethods] is given elsewhere on the EIS wiki.
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{{{
IDL> wininfo=eis_get_wininfo(filename,/list)
}}}
This page (revision-9) was last changed on 27-Mar-2020 14:38 by Peter YoungTop