What is Montage?

Montage is a toolkit for assembling Flexible Image Transport System (FITS) images into custom mosaics. Key features for end users are:

Preserves spatial and calibration fidelity of input images
Runs on all common Linux/Unix platforms
Runs on desktops, clusters and computational grids
Open source code and user documentation available for download
Supports all World Coordinate System (WCS) projections and common coordinate systems
Processes 40 million pixels in up to 32 minutes on 128 nodes on a Linux cluster
Independent engines for analyzing the geometry of images on the sky; re-projecting images; rectifying background emission to a common level; co-adding images
Tools for managing and manipulating large image files


November 9, 2018
Version 6 released. See Release of Montage Version 6.0 (MontagePy) on the home page or go directly to the User Guide for Running Montage Under Python.
January 11, 2017
Check out our poster "TOASTing Your Images with the Montage Mosaic Engine" by Bruce Berriman that was presented at the Winter AAS meeting in Grapevine, Texas this month. The poster describes how Montage transforms FITS files to the TOAST projection for consumption by the WorldWide Telescope.
December 21, 2016
Version 5 released. See Release of Montage Version 5.0 on the home page or the Download page.
August 16, 2016
We've posted a new tutorial for Montage novices called Getting Started: Creating Your First Mosaic.
November 16, 2015
We have released our YouTube channel that has four videos of image cubes created with Montage, including the GALFA movie shown at the ADASS conference in Sydney in October. Also, Montage is now on Twitter as @montage_mosaics.
September 30, 2015
Version 4 Released. See Release of Montage Version 4.0 on the home page.
February 18, 2015
Mac users should see the note on the left regarding patching the software.
July 23, 2014
The Montage license has been changed to a BSD 3-Clause License, which permits unlimited redistribution of Montage code for any purpose as long as its copyright notices and the license's disclaimers of warranty are included.
January 19, 2011
Montage now has a published Wikipedia article.
December 15, 2010
Montage version 3.3 released! Plus, new C-shell scripts contributed by Colin Aspin and new publications on using Montage in cloud computing and Web 2.0. Also, read the new Montage blog and "Like" us on Facebook.
July 1, 2010
Our new User-Contributed Software page now contains a link to Dr. Tom Robitaille's Python API for Montage. The software enhances Montage functionality, including functions for accessing individual Montage commands and facilitating mosaicking and re-projecting.
March 22, 2010
The on-request mosaic web service now serves the DR7 data set from the Sloan Digital Sky Survey (SDSS).
October 4, 2007
IRSA and the NVO announce an on-request mosaic web service. The service runs on a compute cluster and uses Montage to return mosaics from 2MASS, SDSS and DSS.

Release of Montage Version 6.0

Version 6.0 is a major new release, and deploys Python binary extensions of existing Montage modules (MontagePy). Requires Python 3.x or above; Python 3.6+ is recommended. Montage is released with a BSD 3-clause license. Visit the Montage Python User Guide to learn more details of the release, how to install it, and how to use it.

What is in this release?

Python binary extensions of existing Montage modules; no new functionality has been introduced. Click here to see a list of all supported modules. The Python extensions have been created by transforming the C code into a library, with driver code fully separated to reproduce the calling sequence of the command-line tools; and then adding Python and C linkage code with the Cython library, which acts as a bridge between general C libraries and the Python interface. These binary extensions offer image processing at compiled speeds in the Python environment.

Featured Mosaic

This image represents an average of the central 10 velocity planes of a mosaic of five data cubes released as part of the Galactic Arecibo L-band Feed Array HI (GALFA-HI) survey (Peek et al., 2011, Ap J Suppl, 194, 20; DOI 10.1088/0067-0049/194/2/20; ADS Bibcode 2011ApJS..194...20P). GALFA is a high-resolution (~4'), large-area (13,000 deg2), high spectral resolution (0.18 km s-1), and wide band (-700 km s -1 < v LSR < +700 km s-1) survey of the Galactic interstellar medium in the 21 cm line hyperfine transition of neutral hydrogen conducted at Arecibo Observatory. See the Data Cube Mosaics tutorial on how to compute a data cube mosaic such as this.