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\page faq

<title>GDAL FAQ</title>

<ol>

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<li> <b>What's this OGR Stuff?</b><p>

The gdal/ogr tree holds source for a vector IO library inspired by

OpenGIS Simple Features. In theory it is separate from GDAL, but currently

they reside in the same source tree and are somewhat entangled. More

information can be found at

<a href="http://gdal.velocet.ca/projects/opengis/">http://gdal.velocet.ca/projects/opengis</a>. It is my plan to fold OGR into GDAL properly at some point

in the future. Then GDAL will be a raster and vector library. <p>

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<li> <b>How do I add support for a new format?</b><p>

To some extent this is now covered by the

<a href="gdal_drivertut.html">GDAL Driver Implementation Tutorial</a>.<p>

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<li> <b>What exactly was the license terms for GDAL?</b><p>

The following terms are the same as X windows is released under, and is

generally known as the "MIT License". It is intended to give you permission

to do whatever you want with the GDAL source, including building propietary

commercial software, without further permission from me, or requirement to

distribute your source code. A few portions of GDAL under under slightly

different terms. For instance the libpng, libjpeg, libtiff, and libgeotiff

license terms may vary slightly though I don't think any of them differ

in any significant way.<p>

<pre>

Copyright (c) 2000, Frank Warmerdam

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:

The above copyright notice and this permission notice shall be included

in all copies or substantial portions of the Software.

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.

</pre>

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<li> <b>What are ``Well Known Text'' projections, and how do I use them?</b><p>

OpenGIS's <i>Well Known Text</i> is a textual format for defining coordinate

systems. It is loosely based on the EPSG coordinate systems model. While

GDAL itself just passes these definitions around as text strings, there is

also an OGRSpatialReference class in gdal/ogr for manipulating them and

a linkage to <a href="http://www.remotesensing.org/proj">PROJ.4</a> for

transforming between coordinate systems. The

OGRSpatialReference, and PROJ.4 linkaged (but not PROJ.4 itself) is

linked into the GDAL shared library by default. More documentation on WKT

and OGRSpatialReference can be found in the

<a href="http://gdal.velocet.ca/projects/opengis/ogrhtml/osr_tutorial.html">

OGR Projections Tutorial</a>.<p>

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<li> <b>Can I reproject rasters with GDAL?</b><p>

At this time there is no utility for reprojecting images with GDAL. Hopefully

there will be soon, but no timetable is set.<p>

</ol>

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