Skip to main content

Discrete Sky Operator (DiSkO) Aperture Synthesis Radio Imaging

Project description

Discrete Sky Operator (DiSkO) Synthesis Imaging

Build Status

Author: Tim Molteno tim@elec.ac.nz

Its so cool its POINTLESS. Image by using the telescope operator keeping track of the telescope null-space and range-space. This software carries out a sparsity reduction by regularization and controls the volume of the sky solution. The result is an imaging algorithm that is sensitive to diffuse broad sources, and does not require restoration like CLEAN. Publications to appear :)

Howto

disko --display --show-sources

To load a data from a measurement set

disko --ms test_data/test.ms --tikhonov --nside 32 --PDF

VLA imaging with DiSkO

Download the VLA 5GHZ continuum survey measurement set. AG733_A061209.xp1 from the NRAO site.

Calibrate and then split the measurement set, following the CASA tutorial [https://casaguides.nrao.edu/index.php/VLA_5_GHz_continuum_survey_of_Seyfert_galaxies]

disko --fov 0.01 --ms NGC1194.split.ms --SVG --arcmin 0.0025 --tikhonov

More challenging

This tutorial should generate a file with lots of diffuse radiation. [https://casaguides.nrao.edu/index.php/VLA_Continuum_Tutorial_3C391-CASA5.5.0]

wget http://casa.nrao.edu/Data/EVLA/3C391/3c391_ctm_mosaic_10s_spw0.ms.tgz
wget https://github.com/jaredcrossley/CASA-Guides-Script-Extractor/blob/master/extractCASAscript.py

python extractCASAscript.py 'https://casaguides.nrao.edu/index.php?title=VLA_Continuum_Tutorial_3C391-CASA5.5.0'

Then in CASA

execfile("VLAContinuumTutorial3C391-CASA5.5.0.py")

This should generate a suitable measurement set to image.

Changelog

0.6.0b2 Use dask for very large jobs 0.6.0b1 Get data from Measurement Sets! 0.5.0b5 Allow sources not to be shown. 0.5.0b4 Override plot in HPSubSphere to allow for non-normal pixels. 0.5.0b3 Added elliptical source circle projections in SVG. 0.5.0 Getting imaging logic better. Added L2 regularization, and cross-validation

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Files for disko, version 0.6.0b3
Filename, size File type Python version Upload date Hashes
Filename, size disko-0.6.0b3.tar.gz (34.0 kB) File type Source Python version None Upload date Hashes View hashes

Supported by

Elastic Elastic Search Pingdom Pingdom Monitoring Google Google BigQuery Sentry Sentry Error logging AWS AWS Cloud computing DataDog DataDog Monitoring Fastly Fastly CDN DigiCert DigiCert EV certificate StatusPage StatusPage Status page