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: http://hea-www.harvard.edu/RD/zhtools/
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ZHTOOLS is a collection of stand-alone UNIX programs useful for reduction of astronomical images in FITS format and of X-ray data in general, developed by Alexey Vikhlinin. Currently, zhtools includes the following analysis tasks:
General Astronomy Tasks
ad2rad h:m:s d:m:s -> radians angle2size angular to proper size conversion in different cosmologies size2angle proper to angular size conversion in different cosmologies distance angular distance between two points on the sky rad2ad radians -> h:m:s d:m:s
FITS Data Manipulations
addcomm add comment records to FITS header addhist adds history records to FITS header chimtype change data type (e.g. real->integer) in an image. Data may be optionally rescaled. copyheader copy header keywords from one FITS file to another (see also FTOOL cphead). copywcs copy just the World Coordinate System keywords from the header of one FITS image to others. fcolappend append a constant column to a FITS table fitsparsename Prints components of the extended FITS file name. fitspha convert ASCII files to FITS PHA (see also FTOOL ascii2pha). gtiexp prints out the total exposure of the GTI file gtifits converts ASCII GTI files to FITS format iffits prints 1 if its argument is a fits file, 0 otherwise listfits print out FITS header keywords. See also listhead supplied with FITSIO. modifyheader modifies FITS header. This tools is derived from FTOOL fmodhead but incorporates two important improvements printkey prints a FITS keyword value rfits convert fits image to unformatted fortran file wfits convert unformatted fortran file to fits
Image Tasks
adapt smooth an image with circular top hat filter of adaptive size addimages coadd images in the sky coordinates atrous convolve an image with `a trous wavelet contmap draw a contour map createimg make a constant value image dsscoord DSS pixels to sky coordinates dssdetect detect sources in DSS plates dssoverlay overlay contours on DSS (or any other) image findpeak find local maxima in an image gaussimg simulate a Gaussian image imarith simple arith. on two images. See also imcalc and imcarith imblock block and reblock the image imcalc arbitrary image calculus; for simple arithmetic, see imarith and imcarith imcarith constant value arithmetics with an image. Also sqrt, min, max, abs imcopy provided for image manupulation using FITSIO's extended name syntax imdiff reports pixel-by-pixel difference of two images imexam report many image statistics img2list convert integer image to pixel list improj projection of a 2-d image along a direction imsmo smooth image with a Gaussian filter island find connected domains in an image kingimg simulate a beta-model image list2img convert ASCII `photon list' to an image makeimg make an image from FITS events files. Probably made obsolete by fitscopy mexhat convolve an image with the Mexican Hat wavelet mkcond logical operation on an image mkedge set image to a value outside the given radius mkprof calculate radial surface brightness profile mkreg make a mask image from the ASCII region descriptor pix2sky pixels -> sky coordinates poisson simulate Poisson scatter prof2img convert radial surface brightness profile to a 2d image saoimage2reg translate SAOimage region file to the zhtools region descriptor; this tool is almost obsolete because zhtools now understand SAOimage reg.files (see regions) savecont save contours for further use by dssoverlay scatter add Gaussian scatter to an image select apply temp, energy and spatial selection to a FITS events file; probably made obsolete by fitscopy setval set image value in a region sky2pix sky coordinates -> pixels sky2dss sky coordinates -> DSS pixels stackimages adds several images without shift transreg translate region from one WCS to another wvdecomp wavelet decomposition
ROSAT-Specific Tasks
extrrosatspec extract spectrum in 34 ROSAT channels makerosatpsf make ROSAT PSPC PSF image for given source positions makesnowdenspec make spectrum from Snowden's images rosatpsffwhm return FWHM of the PSPC PSF
Misc Tasks
getpar a tool to read command line arguments in shell scriptsInstallation
The zhtools software package has been ported to the Solaris, Linux, and Mac OSX (Tiger on PPC and Intel) operating systems. It can be built and installed using standard commands:
./configure --prefix=[installdir] # configuration make # build the software make install # install in [installdir]Installation is made easier by the availability of pre-built external libraries. Please read the Build Instructions for complete installation instructions.
The latest release is zhtools 3.0.6 (25 October 2012).
Latest Release