\item[pointingcolumntouse] This parameter is NOT to be changed under normal circumstances. This is to be used by those who know what they are doing and want to try to use different columns in the POINTING table especially if they believe their dish direction is wrong. And if any of the {\tt \_OFFSET} columns is used do not expect to be able to use a different frame in the image setup in <link anchor="imager:imager.defineimage.function">defineimage</link>. Possible values are {\tt DIRECTION, TARGET, ENCODER, POINTING\_OFFSET, SOURCE\_OFFSET}
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" ?>
<casaxml xmlns="http://casa.nrao.edu/schema/psetTypes.html"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://casa.nrao.edu/schema/casa.xsd
file:///opt/casa/code/tools/xml/casa.xsd">
<tool name="imager" module="imager">
<shortdescription>tool for synthesis imaging</shortdescription>
imager is an tool that accomplishes synthesis processing.
A {\tt imager} must be constructed for each MeasurementSet for which one
wishes to do processing. Multiple copies of {\tt imager} may
be made at any time (provide they are given different names).
<include>tools/synthesis/imager_forward.h</include>
<include>tools/synthesis/imager_private.h</include>
<method type="constructor" name="imager">
<shortdescription>Construct an imager tool</shortdescription>
This is used to construct {\tt imager} tools associated
with a MeasurementSet. The {\tt imager} tool may then be
used to generate various types of images. Note that
a new executable is started every time the constructor
This returns a Glish variable containing the tool functions of
imager in an alternate universe that you have to tunnel to with a wormhole
im.defineimage(nx=256, ny=256, cellx='0.7arcsec', celly='0.7arcsec')
im.image(type='corrected', image='3C273XC1.dirty')
<method type="function" name="advise">
<shortdescription>Advise (and optionally use) parameter values</shortdescription>
Advise on recommended values of certain parameters. Return these
values and optionally use them in Imager.
The calculations are performed as following:
\item[cell] The maximum uv distance in wavelength is found and then half of the
inverse is taken as the maximum cellsize allowed.