# GMT Version 3.3.1 for OS/2 Warp

Table of Contents

- Introduction
- Requirements
- Obtaining Code and Data
- Environment variables
- Installation
- Documentation
- Utilities
- Help and Bug Reports

## Introduction

I have ported the Generic Mapping Tools (GMT) package from Unix to OS/2. GMT is a freely-available package, distributed under the GNU Public License, that produces exceptionally high-quality graphical output; it has been developed by Paul Wessel, currently at the University of Hawaii, and Walter Smith, presently at NOAA. GMT is especially designed for spatial data, and includes ways of displaying information using any one of many map projections. All GMT graphical output is postscript, and can be printed on any postscript printer, or printed with a utility such as Ghostscript. For more details on GMT, refer to the GMT Web Site, which also provides many examples of GMT graphical output.

This version of GMT for OS/2 has only been tested Warp 4. No testing has been performed on OS/2 version 2.x of Warp 3, although I expect that the GMT routines, which make no use of PM or the WPS, should work fine on either of these systems.

GMT can be compiled for either a US installation or an SI (Europe or Asia) installation. Both an SI and a US distribution of executables is provided.

Note: The current version of GMT is 3.3.1.

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## Requirements

### System

The present OS/2 version of GMT is REQUIRED to be installed upon a disk formated for HPFS. It might work with file systems such as the native file system used by Linux (which can be read by OS/2 with the appropriate IFS driver), but has not been tested using such a file system. I have no plans to produce a version that will execute on a FAT file system unless several requests for such are received.

Having said that, note that HPFS is really required in order to permit access to files containing world coastline data, political boundaries, and related infomation, as well as to files containing Postscript pattern information. There are many routines in GMT that do not need or use this information; such routines should work fine on a FAT file system.

### Libraries

Run-time. In addition to the GMT codes, one must also have installed the run-time support for EMX. This plus the remainder of the EMX development system is freely available from Hobbes or LEO. The OS/2 version of GMT has been compiled with EMX version 0.9d (fix level 1), and thus the run-time library corresponding to that version should be used.

Development. In addition to the EMX development system, GMT requires the netCDF libraries, developed by the University Corporation for Atmospheric Research. These are freely available from its ftp site, but an OS/2 version is provided with this GMT distribution.

Note that netCDF support is not required to be installed if one only plans to use the GMT executables. Installation of netCDF is necessary, though, for any recompilation of the GMT routines.

In addition, GMT requires a math library; I have used Sun Microsystem's Freely Distributable Math Library (fdlibm), available from netlib, for the required routines. This math library and its source are included with this package.

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## Obtaining the code and related data

Due to the size of the archives, I am distributing GMT for OS/2 in four ZIP archives. Two of these archives are executables only: GMT331-OS2-sibin.zip, the European version, and GMT331-OS2-usbin.zip, the U.S. version. The other two archives, GMT331-OS2-src.zip and GMT331-OS2-doc.zip contain the source code (including man pages) and documentation, respectively. The documentation archive contains extensive documentation, including a tutorial. The documentation is provided in HTML as well as postscript.

The required archives can be found at the ftp site

ftp.geophysics.lanl.gov in the directory pub/EES3/pub/gmt/GMT3.3.1. Please insure that any file transfers are done in BINARY (or Image) mode. Links are provided here for convenience:

US Exectables
European Executables
Source Distribution
Documentation

I also plan to upload the archives to Hobbes and LEO, so if the above ftp site is unavailable, one should check those sites.

GMT contains five different resolutions of world political and coastline data. The resolutions provided are crude, low, intermediate, high, and full (in increasing order of spatial resolution). Only the crude-, low-, and intermediate-resolution data are provided in the basic distribution. All others can be obtained using links from the main GMT web site to one of its mirror sites throughout the world.

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## Environment Variables

The environment variable GMTHOME must to be set for GMT to work properly. If this respect, the OS/2 distribution is the same as the Unix distribution. GMT will look for required data files in the subdirectory lib beneath the main GMT directory specified by GMTHOME. I suggest setting GMTHOME in CONFIG.SYS. In addition, the variable HOME should be set to a directory of the user's choice (it could be the same as GMTHOME); GMT stores default parameters in that directory. Remember to use forward slashes rather than backward slashes to indicate the directories (for example, use SET GMTHOME=d:/GMT rather than SET GMTHOME=d:\GMT).

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## IInstallation

To install, unzip the archives and set the environment variables as discussed above. Install the executables in the directory /GMT/GMT3.3.1/os2bin or in any other location in your PATH. If you are using man, set your MANPATH to either /GMT/GMT3.3.1/src/SI/man or /GMT/GMT3.3.1/src/US/man, whichever is appropropriate.

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## Documentation

Documentation for the routines that comprise GMT is found starting in the /GMT/GMT3.3.1/src subdirectory. Below that directory there are subdirectories SI and US, as the man pages are slightly different for the European (SI) and US versions of GMT. For each routine, there is a Unix man page describing how to use the routine. In addition, there is both html and postscript documentation in GMT331-OS2-doc.zip. The html documentation can be read from starting from /GMT/GMT3.3.1/www/gmt/gmt_services.html.
Both a Technical Reference, a Tutorial, and easy access to the individual man pages can be obtained starting from this base.
In addition, one can access all the GMT html documentation from the GMT web site.

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## Other Utilities

GMT produces outstanding graphical output. All its output is in the form of either Postscript or Encapsulated Postscript files. Some readily-available utilities are extremely useful for viewing or printing such files. Aladdin Ghostscript provides one the ability to print Postscript files to non-Postscript printers; I recommend it (there is also a Gnu version of ghostscript, which I simply have not used). An outstanding OS/2 utility named GSView, written by Russell Lang, uses Aladdin Ghostscript and provides an OS/2 user the ability to preview Postscript and Encapsulated Postscript files.
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## Help and Bug Reports

This version of GMT is not directly supported by Paul Wessel and Walter Smith, who are the authors of the Unix verison. If you believe you've found a bug, it may be a bug that applies to the Unix version as well as to the OS/2 versions. Be aware that there are two electronic mailing lists available to users. The first, gmtgroup@soest.hawaii.edu, is used primarily to notify users of bug fixes and new versions. The second, gmthelp@soest.hawaii.edu, serves as a users forum for idea exchange and questions about GMT usage. To subscribe to either of these lists, send an e-mail message to listserver@soest.hawaii.edu containing one or both of the commands

    subscribe gmtgroup <your full name, not your e-mail address>
    subscribe gmthelp  <your full name, not your e-mail address>

Do not include the angle brackets in the message. Also, if your e-mail client appends a signature file to your outgoing messages, inhibit the sending of the file (or send a blank file).

For questions of bug reports that you believe are specific to the OS/2 version, please send bug reports [e-mail only!] to Allen Cogbill, Los Alamos National Laboratory.

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