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<center>
<title>GXF-3</title>
</center>

<h2>Introduction</h2>

The GXF-3 library is intended to make correct implementation of GXF-3 file
format readers easy.  It consists of free (OpenSource) C source code for 
functions to read GXF-3 raster files, and an example program using them to 
convert GXF data to GeoTIFF format.<p>

GXF (Grid eXchange File) is a standard ASCII file format for exchanging 
gridded data among different software systems. Software that supports the 
GXF standard will be able to import properly formatted GXF files and export 
grids in GXF format.  GXF-3 is an adopted standard format of the
Gravity/Magnetics Committee of the Society of Exploration Geophysicists (SEG).
GXF-3 is the primary gridded data interchange format for 
<a href="http://www.Geosoft.com/">Geosoft</a>.<p>

<h2>Resources</h2>

<ul>
<li> <a href="gxfopen.h.html">GXF-3 API Documentation</a>
<li> <a href="ftp://gdal.velocet.ca/pub/outgoing/gxf3_1_0.tar.gz">GXF-3 API in .tar.gz</a>
<li> <a href="ftp://gdal.velocet.ca/pub/outgoing/gxf3_1_0.zip">GXF-3 API in ZIP</a>
<li> <a href="gxfr3d9_1.pdf">GXF-3 File Format Specification (pdf)</a>
</ul>

<h2>Licensing</h2>

This library is offered as <a href="http://www.opensource.org">Open Source</a>.
In particular, it is offered under the X Consortium license which doesn't
attempt to impose any copyleft, or credit requirements on users of the code.<p>

The precise license text is:<p>

<em>
 Copyright (c) 1999, Frank Warmerdam
<p>
 Permission is hereby granted, free of charge, to any person obtaining a
 copy of this software and associated documentation files (the "Software"),
 to deal in the Software without restriction, including without limitation
 the rights to use, copy, modify, merge, publish, distribute, sublicense,
 and/or sell copies of the Software, and to permit persons to whom the
 Software is furnished to do so, subject to the following conditions:
<p>
 The above copyright notice and this permission notice shall be included
 in all copies or substantial portions of the Software.
<p>
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 DEALINGS IN THE SOFTWARE.
<p>
</em>

<h2>Building the Source</h2>

Unix developers should be able to unpack the .tar.gz file, run configure, 
and type make to build the library (libgxf3.a), and a simple test program
(gxftest.c).<p>

Windows developers should unpack the .zip file, and type 
<tt>nmake /f makefile.vc</tt> to build with VC++. <p>

<h2>Author and Acknowledgements</h2>

The primary author of the GXF3 library is 
<a href="http://pobox.com/warmerdam">Frank Warmerdam</a>, 
and I can be reached at 
<a href="mailto:warmerdam@pobox.com">warmerdam@pobox.com</a>.  I am open to
bug reports, and suggestions.<p>

I would like to thank:<p>

<ul>
<li> <a href="http://www.globalgeo.com/">Global Geomatics</a>
who funded development the majority of the work on this library, 
and agreed for it to be Open Source.<p>

<li> Ian Macleod of Geosoft who answered a number of questions I had,
and provided sample files.<p>

</ul>

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