https://casaguides.nrao.edu/index.php?title=Simdata_CASA_3.1&feed=atom&action=historySimdata CASA 3.1 - Revision history2024-03-28T19:51:37ZRevision history for this page on the wikiMediaWiki 1.38.6https://casaguides.nrao.edu/index.php?title=Simdata_CASA_3.1&diff=4407&oldid=prevMlacy: moved Simdata2 to Simdata CASA 3.1: moved to reflect simdata2 -> simdata in CASA 3.12010-12-01T15:53:21Z<p>moved <a href="/index.php?title=Simdata2" class="mw-redirect" title="Simdata2">Simdata2</a> to <a href="/index.php?title=Simdata_CASA_3.1" title="Simdata CASA 3.1">Simdata CASA 3.1</a>: moved to reflect simdata2 -> simdata in CASA 3.1</p>
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</td></tr></table>Mlacyhttps://casaguides.nrao.edu/index.php?title=Simdata_CASA_3.1&diff=3322&oldid=prevJgallimo at 15:55, 20 May 20102010-05-20T15:55:52Z<p></p>
<a href="https://casaguides.nrao.edu/index.php?title=Simdata_CASA_3.1&diff=3322&oldid=3321">Show changes</a>Jgallimohttps://casaguides.nrao.edu/index.php?title=Simdata_CASA_3.1&diff=3321&oldid=prevJgallimo: Created page with '<pre> mosaic simulation task: mosaic simulation task (prototype): This task simulates interfermetric observations (currently only ALMA can be done easily). New fu…'2010-05-20T15:55:16Z<p>Created page with '<pre> mosaic simulation task: mosaic simulation task (prototype): This task simulates interfermetric observations (currently only ALMA can be done easily). New fu…'</p>
<p><b>New page</b></p><div><pre><br />
mosaic simulation task:<br />
mosaic simulation task (prototype): <br />
<br />
This task simulates interfermetric observations (currently <br />
only ALMA can be done easily). New functionality is actively <br />
being added, so if you have changed versions of CASA, check <br />
the inputs carefully.<br />
Please contact CASA experts with any questions, especially <br />
about features noted below as *experimental* <br />
-------------------------------<br />
project -- root filename for all output files.<br />
-------------------------------<br />
modifymodel -- change the coordinate system of the model sky image?<br />
* if graphics selected, display the rescaled model image<br />
skymodel -- if modifymodel=False, use this as the sky model. <br />
* if modifyimage=True, use this as the starting point, modify it <br />
write the output to a different image (default $project.skymodel)<br />
and use that new image as the sky model<br />
inbright -- peak brightness in Jy/pixel, or "" for unchanged<br />
* NOTE: "unchanged" will take the numerical values in your image <br />
and assume they are in Jy/pixel, even if it says some other unit <br />
in the header. <br />
indirection -- central direction, or "" for unchanged<br />
incell -- spatial pixel size, or "" for unchanged<br />
incenter -- frequency of center channel e.g. "89GHz", or "" for unchanged<br />
inwidth -- width of channels, or "" for unchanged - this should be a <br />
string representing a quantity with units e.g. "10MHz"<br />
* NOTE: only works reliably with frequencies, not velocities<br />
* NOTE: it is not possible to change the number of spectral planes<br />
of the sky model, only to relabel them with different frequencies<br />
That kind of regridding can be accomplished with the CASA toolkit.<br />
-------------------------------<br />
setpointings -- calculate a map of pointings, or if false, provide ptgfile<br />
* if graphics selected, display the pointings shown on the model image<br />
ptgfile -- a text file specifying directions in the same <br />
format as the example, and optional integration times, e.g.<br />
#Epoch RA DEC TIME(optional)<br />
J2000 23h59m28.10 -019d52m12.35 10.0<br />
* if the time column is not present in the file, it will use<br />
"integration" for all pointings.<br />
* NOTE: at this time the file should contain only science pointings:<br />
simdata will observe these, then optionally the calibrator, <br />
then the list of science pointings again, etc, until totaltime<br />
is used up. <br />
integration --- Time interval for each integration e.g '10s'<br />
* NOTE: to simulate a "scan" longer than one integration, use <br />
setpointings to generate a pointing file, and then edit the <br />
file to repeat each pointing several times before moving to the <br />
next point.<br />
direction -- mosaic center direction e.g 'J2000 19h00m00 -40d00m00'<br />
* can optionally be a list of pointings<br />
* otherwise simdata will pack mapsize according to maptype<br />
mapsize -- angular size of map <br />
* set to "" to span the model image<br />
maptype -- hexagonal or linear <br />
pointingspacing -- spacing in between beams e.g '1arcsec' <br />
-------------------------------<br />
predict -- calculate visibilities from skymodel (which may have been <br />
modified above, (optionally) complist, and $ptgfile (which <br />
may have been generated above)<br />
* if graphics selected, display the array (like plotants), the uv <br />
coverage, the synthesized (dirty) beam, and ephemeris information<br />
refdate -- central time of simulated observation eg: '2012/05/21/22:05:00'<br />
* NOTE: observations are currently centered at the nearest transit *<br />
totaltime --- total time of observation e.g '7200s'<br />
antennalist -- ascii file containing antenna positions.<br />
each row has x y z coordinates and antenna diameter; <br />
header lines are required to specify the observatory name<br />
and coordinate system e.g. <br />
# observatory=ALMA<br />
# coordsys=UTM<br />
# datum=WGS84<br />
# zone=19<br />
* standard arrays are found in your CASA data repository, <br />
os.getenv("CASAPATH").split()[0]+"/data/alma/simmos/" <br />
* if "", will not not produce an interferometric MS<br />
* NEW: a string of the form "alma;0.5arcsec" will be parsed into a full 12m ALMA<br />
configuration. This only works for full ALMA and may fail to find the <br />
standard configuration files on some systems - see casaguides.nrao.edu<br />
caldirection -- *NEW* an unresolved calibrator can be observed <br />
interleaved with the science pointings. This feature is <br />
experimental, so please contact us with any questions.<br />
* The calibrator is implemented as a point source clean component <br />
with this direction and flux=calflux<br />
sdantlist -- antenna position file with antennas to be used for <br />
single dish or total power simulation <br />
* if "", will not produce a total power MS<br />
sdant -- the index of the antenna in the list to use for total <br />
power. defaults to the first antenna on the list. <br />
-------------------------------<br />
<br />
</pre></div>Jgallimo