mFixNaN(1)
NAME
mFixNaN - Replace a particular set of values in a FITS image with NaNs (or vice-versa)
SYNOPSIS
mFixNaN [-d level] [-v NaN-value] in.fits out.fits [minblank maxblank]
DESCRIPTION
Converts NaNs found in the image to some other value (given by the user), or converts a range of supplied values into NaNs.
OPTIONS
-d level
Turn on debugging to the specified level (1-3)
-v NaN-value
Value to use in place of any NaNs
ARGUMENTS
in.fits
Input FITS image file
out.fits
Path of output FITS file. To run in "count" mode without
creating an output file, use a dash ("-") for this argument.
minblank maxblank
If the "-v" switch is not used, mFixNaN will replace all pixel
values between minblank and maxblank with NaN.
RESULT
[struct stat="OK", rangeCount=rangeCount, nanCount=nanCount] rangeCount is the number of pixels that were found between minblank and maxblank, if they were specified. If not (i.e., NaNs were removed and replaced with value), nanCount is the number of NaNs removed.
MESSAGES
OK [struct stat="OK", rangeCount=rangeCount, nanCount=nanCount"] ERROR No debug level given ERROR Debug level string is invalid: level ERROR Debug level string is invalid: level ERROR Debug level string cannot be negative ERROR No value given for NaN conversion ERROR NaN conversion value string is invalid: 'NaN-value' ERROR Invalid input file 'in.fits'] ERROR min blank value string is not a number ERROR max blank value string is not a number ERROR Image file in.fits missing or invalid FITS ERROR FITS library error
EXAMPLES
A FITS image with BITPIX -64 (double-precision floating point) was
generated without using NaNs; all "blank" pixels are represented by
very small negative numbers. This can throw off initial attempts to
display the image with a proper stretch, and does not conform to the
FITS standard. To replace all those "blank" pixels with NaNs:
mFixNaN original.fits NaN.fits -4.61169e32 -4.61169e10
[struct stat="OK", rangeCount=1321, nanCount=0]
To convert those NaNs back into a single pixel value:
mFixNaN -v -4.6e32 NaN.fits blankval.fits
[struct stat="OK", rangeCount=0, nanCount=1321]
BUGS
The drizzle algorithm has been implemented but has not been tested in this release. If a header template contains carriage returns (i.e., created/modified on a Windows machine), the cfitsio library will be unable to read it properly, resulting in the error: [struct stat="ERROR", status=207, msg="illegal character in keyword"] It is best for the background correction algorithms if the area described in the header template completely encloses all of the input images in their entirety. If parts of input images are "chopped off" by the header template, the background correction will be affected. We recommend you use an expanded header for the reprojection and background modeling steps, returning to the originally desired header size for the final coaddition. The default background matching assumes that there are no non-linear background variations in the individual images (and therefore in the overlap differences). If there is any uncertainty in this regard, it is safer to turn on the "level only" background matching (the "-l" flag in mBgModel.
COPYRIGHT
2001-2015 California Institute of Technology, Pasadena, California If your research uses Montage, please include the following acknowledgement: "This research made use of Montage. It is funded by the National Science Foundation under Grant Number ACI-1440620, and was previously funded by the National Aeronautics and Space Administration's Earth Science Technology Office, Computation Technologies Project, under Cooperative Agreement Number NCC5-626 between NASA and the California Institute of Technology." The Montage distribution includes an adaptation of the MOPEX algorithm developed at the Spitzer Science Center.
Opportunity
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
Free Books
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Education
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.
