Montage Montage is an astronomical image toolkit with components for reprojection, background matching, coaddition and visualization of FITS files. It can be used as a set of command-line tools (Linux, OS X and Windows), C library calls (Linux and OS X) and as Python binary extension modules.

The Montage source is written in ANSI-C and code can be downloaded from GitHub ( https://github.com/Caltech-IPAC/Montage ). The Python package can be installed from PyPI ("</i>pip install MontagePy"). The package has no external dependencies. See http://montage.ipac.caltech.edu/ for details on the design and applications of Montage.

MontagePy.main modules: mArchiveList¶

The Montage modules are generally used as steps in a workflow to create a mosaic of a set of input images. These steps are: determine the geometry of the mosaic on the sky, reproject the images to a common frame and spatial sampling; rectify the backgrounds to a common level, and coadd the images into a mosaic. This page illustrates the use of one Montage module, mArchiveList, which is used to search for images from a given archive in a region of the sky.

Visit Building a Mosaic with Montage to see how mArchiveList is used as part of a workflow to creage a mosaic (or the one shot version if you just want to see the commands). See the complete list of Montage Notebooks here.

from MontagePy.main import mArchiveList

help(mArchiveList)

Help on built-in function mArchiveList in module MontagePy.main:

mArchiveList(...)
    mArchiveList retrieves a list of images (and download URLs) from the Montage metadata service based on archive/band/location/size.
    
    Parameters
    ----------
    survey : str
        Survey (2MASS, SDSS, WISE, etc.
    band : str
        Wavelength band (e.g. J for 2MASS).
    locstr : str
        A (quoted if necessary) string containing a coordinate or the name of an object on the sky.
    width : float
        Region width in degrees.
    height : float
        Region height in degrees.
    outfile : str
        Output table file.
    debug : int, optional
        Debugging output flag.
    
    
    Returns
    -------
    status : int
        Return status (0: OK, 1:ERROR).
    msg : str
        Return message (for errors).
    count : int
        Number of images in list.

mArchiveList Example¶

mArchiveList can be used to retrieve a list of images overlapping a region on the sky for the following missions: 2MASS, SDSS, WISE and DSS. These were chosen because they are all-sky or at least very large contiguous areas of the sky. This list contains some metadata describing the image coverage, a URL to retrieve the image, and a suggested name for a local file name to use on download.

The following call retrieves a list of 2MASS J-band images for a 0.5 degree region around M17. NOTE: Not all archive metadata searches are equally good about matching the sky coverage you intend. We find it best to ask for metadata for a larger area than you need, then narrow the list down using the header for the region you want and mCoverageCheck.

rtn = mArchiveList('2MASS', 'J', 'M17', 2., 2., 'work/M17/archive.tbl')
 
print(rtn)

{'status': '0', 'count': 418}

Montage modules return JSON structures. They always include a status (0: success; 1: error) and a variable number of informational parameters. Here it shows the count for the returned list of images.

Archive List Data¶

The returned table is in IPAC ASCII format, the default for Montage. You can read it into a Pandas dataframe with AstroPy. Here we extract the URL used to download each data file and the local file name.

import os
import numpy as np
import pandas as pd
from astropy.io import ascii

ipactable = ascii.read('work/M17/archive.tbl').to_pandas()

ipactable

mArchiveList Error Handling¶

If mArchiveList encounters an error, the return structure will just have two elements: a status of 1 ("error") and a message string that tries to diagnose the reason for the error.

For instance, if the user asks for an unsupported dataset:

rtn = mArchiveList('OtherMission', 'A', 'M51', 0.5, 0.5, 'remote.tbl')

print(rtn)

{'status': '1', 'msg': b'Invalid survey name: OTHERMISSION A'}

Classic Montage: mArchiveList as a Stand-Alone Program¶

Unix/Windows Command-line Arguments¶

mArchiveList can also be run as a command-line tool in Linux, OS X, and Windows:

Usage: mArchiveList [-d] survey band object|location width height outfile (object/location must be a single argument string)

mArchiveList as a Library Call¶

If you are writing in C/C++ on Linux or OSX, mArchiveList can be accessed as a library function:

/*-***********************************************************************/
/*                                                                       */
/* mArchiveList -- Given a location on the sky, archive name, and size   */
/* in degrees contact the IRSA server to retreive a list of archive      */
/* images.  The list contains enough information to support mArchiveGet  */
/* downloads.                                                            */
/*                                                                       */
/*   char  *survey         Data survey to search (e.g. 2MASS, SDSS,      */
/*                         WISE, etc.)                                   */
/*                                                                       */
/*   char  *band           Wavelength band (e.g. J for 2MASS, g for      */
/*                         SDSS)                                         */
/*                                                                       */
/*   char  *locstr         A (quoted if necessary) string containing     */
/*                         a coordinate or the name of an object on      */
/*                         the sky                                       */
/*                                                                       */
/*   double width          Image width in degrees                        */
/*   double height         Image height in degrees                       */
/*                                                                       */
/*   char  *outfile        Output FITS header file                       */
/*                                                                       */
/*   int    debug          Debugging output flag                         */
/*                                                                       */
/*************************************************************************/


struct mArchiveListReturn *mArchiveList(char *survey, char *band, char *location,  
                                        double width, double height,
                                        char *outfile, int debug)

Return Structure

struct mArchiveListReturn
{
   int    status;        // Return status (0: OK, 1:ERROR)
   char   msg [1024];    // Return message (for error return)
   char   json[4096];    // Return parameters as JSON string
   int    count;         // Number of lines in output file.
};

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3	380802	RA---SIN	DEC--SIN	512	1024	274.874872	-15.494458	256.5	512.5	-0.000278	...	274.948728	-15.636662	274.801040	-15.636674	274.801118	-15.352229	274.948603	-15.352218	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-990502s-j1340162.fits
4	427643	RA---SIN	DEC--SIN	512	1024	274.131910	-15.226637	256.5	512.5	-0.000278	...	274.205651	-15.368851	274.058155	-15.368844	274.058268	-15.084399	274.205566	-15.084406	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-001012s-j0150150.fits
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9	125562	RA---SIN	DEC--SIN	512	1024	274.503528	-14.630843	256.5	512.5	-0.000278	...	274.577097	-14.773041	274.430013	-14.773067	274.430054	-14.488622	274.576948	-14.488596	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-990502s-j1310151.fits
10	126301	RA---SIN	DEC--SIN	512	1024	274.255663	-14.631538	256.5	512.5	-0.000278	...	274.329213	-14.773745	274.182128	-14.773753	274.182208	-14.489308	274.329103	-14.489300	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-990502s-j1290151.fits
11	317731	RA---SIN	DEC--SIN	512	1024	274.380079	-15.225856	256.5	512.5	-0.000278	...	274.453838	-15.368061	274.306342	-15.368072	274.306419	-15.083627	274.453717	-15.083616	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-990502s-j1300150.fits
12	475064	RA---SIN	DEC--SIN	512	1024	273.884372	-15.493839	256.5	512.5	-0.000278	...	273.958230	-15.636042	273.810542	-15.636056	273.810615	-15.351611	273.958100	-15.351598	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-990502s-j1200162.fits
13	35367	RA---SIN	DEC--SIN	512	1024	274.875054	-17.650014	256.5	512.5	-0.000278	...	274.949749	-17.792217	274.800383	-17.792228	274.800477	-17.507783	274.949607	-17.507772	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-990502s-j1340257.fits
14	46712	RA---SIN	DEC--SIN	512	1024	274.131830	-16.843304	256.5	512.5	-0.000278	...	274.206178	-16.985516	274.057468	-16.985510	274.057594	-16.701065	274.206080	-16.701072	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-001012s-j0150221.fits
15	102749	RA---SIN	DEC--SIN	512	1024	274.628113	-16.574205	256.5	512.5	-0.000278	...	274.702358	-16.716417	274.553860	-16.716412	274.553978	-16.431967	274.702257	-16.431971	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-001012s-j0140209.fits
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21	18095	RA---SIN	DEC--SIN	512	1024	275.123069	-17.112820	256.5	512.5	-0.000278	...	275.197550	-17.255020	275.048625	-17.255038	275.048702	-16.970593	275.197400	-16.970575	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-990502s-j1420233.fits
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26	49474	RA---SIN	DEC--SIN	512	1024	275.123035	-16.843376	256.5	512.5	-0.000278	...	275.197408	-16.985576	275.048699	-16.985594	275.048774	-16.701149	275.197260	-16.701131	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-990502s-j1420221.fits
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29	287402	RA---SIN	DEC--SIN	512	1024	275.122966	-16.304487	256.5	512.5	-0.000278	...	275.197129	-16.446688	275.048839	-16.446705	275.048911	-16.162260	275.196985	-16.162243	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-990502s-j1420198.fits
...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...
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397	3495506	RA---SIN	DEC--SIN	512	1024	276.611886	-16.785552	256.5	512.5	-0.000278	...	276.686237	-16.927752	276.537573	-16.927770	276.537646	-16.643325	276.686088	-16.643307	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-990811s-j0280056.fits
398	4416330	RA---SIN	DEC--SIN	512	1024	276.362645	-16.786731	256.5	512.5	-0.000278	...	276.436974	-16.928942	276.288309	-16.928939	276.288428	-16.644493	276.436870	-16.644497	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-000805s-j0200056.fits
399	4465996	RA---SIN	DEC--SIN	512	1024	276.240939	-16.842092	256.5	512.5	-0.000278	...	276.315305	-16.984296	276.166596	-16.984307	276.166685	-16.699862	276.315170	-16.699851	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-000727s-j0210221.fits
400	2961809	RA---SIN	DEC--SIN	512	1024	276.115782	-17.112899	256.5	512.5	-0.000278	...	276.190236	-17.255112	276.041311	-17.255104	276.041442	-16.970659	276.190139	-16.970667	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-000928s-j0140233.fits
401	3520557	RA---SIN	DEC--SIN	512	1024	276.116619	-17.055576	256.5	512.5	-0.000278	...	276.191059	-17.197785	276.042180	-17.197785	276.042293	-16.913340	276.190945	-16.913340	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-000727s-j0200044.fits
402	3917499	RA---SIN	DEC--SIN	512	1024	276.240143	-17.111446	256.5	512.5	-0.000278	...	276.314605	-17.253655	276.165681	-17.253655	276.165795	-16.969210	276.314491	-16.969210	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-990811s-j0190233.fits
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404	4646158	RA---SIN	DEC--SIN	512	1024	276.239498	-17.057046	256.5	512.5	-0.000278	...	276.313934	-17.199257	276.165054	-17.199253	276.165176	-16.914808	276.313829	-16.914812	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-000928s-j0150044.fits
405	3373608	RA---SIN	DEC--SIN	512	1024	276.487015	-17.649920	256.5	512.5	-0.000278	...	276.561703	-17.792126	276.412337	-17.792131	276.412445	-17.507686	276.561575	-17.507681	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-000805s-j0210257.fits
406	2947753	RA---SIN	DEC--SIN	512	1024	276.115766	-17.382343	256.5	512.5	-0.000278	...	276.190330	-17.524556	276.041185	-17.524548	276.041318	-17.240103	276.190231	-17.240111	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-000928s-j0140245.fits
407	3601007	RA---SIN	DEC--SIN	512	1024	276.239490	-17.326491	256.5	512.5	-0.000278	...	276.314035	-17.468702	276.164936	-17.468698	276.165060	-17.184253	276.313928	-17.184257	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-000928s-j0150033.fits
408	4129208	RA---SIN	DEC--SIN	512	1024	276.116620	-17.594465	256.5	512.5	-0.000278	...	276.191280	-17.736673	276.041960	-17.736674	276.042077	-17.452229	276.191162	-17.452228	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-000727s-j0200021.fits
409	4707015	RA---SIN	DEC--SIN	512	1024	276.487006	-17.380475	256.5	512.5	-0.000278	...	276.561582	-17.522681	276.412440	-17.522686	276.412545	-17.238241	276.561457	-17.238236	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-000805s-j0210245.fits
410	4725409	RA---SIN	DEC--SIN	512	1024	276.362631	-17.325620	256.5	512.5	-0.000278	...	276.437176	-17.467830	276.288078	-17.467827	276.288201	-17.183382	276.437068	-17.183385	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-000805s-j0200033.fits
411	4301207	RA---SIN	DEC--SIN	512	1024	273.884426	-16.032728	256.5	512.5	-0.000278	...	273.958482	-16.174931	273.810398	-16.174945	273.810475	-15.890500	273.958348	-15.890486	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-990502s-j1200186.fits
412	4387828	RA---SIN	DEC--SIN	512	1024	273.760326	-15.707336	256.5	512.5	-0.000278	...	273.834266	-15.849537	273.686423	-15.849555	273.686489	-15.565110	273.834126	-15.565092	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-990502s-j1190103.fits
413	4781559	RA---SIN	DEC--SIN	512	1024	274.008224	-15.976942	256.5	512.5	-0.000278	...	274.082268	-16.119141	273.934226	-16.119163	273.934285	-15.834718	274.082117	-15.834696	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-990502s-j1210092.fits
414	4642570	RA---SIN	DEC--SIN	512	1024	273.884346	-15.224395	256.5	512.5	-0.000278	...	273.958108	-15.366599	273.810612	-15.366612	273.810684	-15.082167	273.957980	-15.082154	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-990502s-j1200150.fits
415	4732578	RA---SIN	DEC--SIN	512	1024	274.008397	-17.054720	256.5	512.5	-0.000278	...	274.082859	-17.196918	273.933981	-17.196940	273.934048	-16.912495	274.082700	-16.912473	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-990502s-j1210044.fits
416	2678665	RA---SIN	DEC--SIN	512	1024	274.627372	-16.303121	256.5	512.5	-0.000278	...	274.701522	-16.445328	274.553233	-16.445333	274.553330	-16.160888	274.701404	-16.160883	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-990502s-j1320198.fits
417	2680438	RA---SIN	DEC--SIN	512	1024	274.132013	-16.572023	256.5	512.5	-0.000278	...	274.206269	-16.714229	274.057773	-16.714236	274.057867	-16.429791	274.206144	-16.429784	http://irsa.ipac.caltech.edu/ibe/data/twomass/...	2mass-atlas-990502s-j1220209.fits