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% vim: set textwidth=78 autoindent: | ||
\chapter{Forward} | ||
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Welcome to the wonderful world of Geographical Information Systems (GIS)! | ||
Quantum GIS (QGIS) is an Open Source Geographic Information System. The project | ||
was born in May of 2002 and was established as a project on SourceForge in June | ||
of the same year. We've worked hard to make GIS software (which is traditionaly | ||
expensive commerical software) a viable prospect for anyone with basic access | ||
to a Personal Computer. QGIS currently runs on most Unix platforms, Windows, and | ||
OS X. QGIS is developed using the Qt toolkit (\url{http://www.trolltech.com}) | ||
and C++. This means that QGIS feels snappy to use and has a pleasing, easy to | ||
use graphical user interface. | ||
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||
QGIS aims to be an easy to use GIS, providing common functions and features. | ||
The initial goal was to provide a GIS data viewer. QGIS has reached that point | ||
in its evolution and is being used by many for their daily GIS data viewing | ||
needs. QGIS supports a number of raster and vector data formats, with new | ||
support easily added using the plugin architecture (see Appendix | ||
\ref{appdx_data_formats} for a full list of currenly supported data formats). | ||
QGIS is released under the GNU Public License (GPL). Developing QGIS under this | ||
license means that you can (if you want to) inspect and modify the source code | ||
and guarantees that you, our happy user will always have access to a GIS | ||
program that is free of cost and can be freely modified. You should have | ||
received a full copy of the license with your copy of QGIS, and is also | ||
available as Appendix \ref{gpl_appendix}. | ||
\begin{quote} | ||
\begin{center} | ||
\textbf{Note:} The latest version of this document can always be found at \newline | ||
http://qgis.sourceforge.net/docs/userguide.html | ||
\end{center} | ||
\end{quote} | ||
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||
\section{Major Features} | ||
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QGIS has many common GIS features and functions. The major features | ||
are listed below. | ||
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\begin{compactenum} | ||
\item Support for spatially enabled PostgreSQL tables using PostGIS | ||
\item Support for ESRI shapefiles and other vector formats support by the | ||
OGR library, including MapInfo files | ||
\item GRASS integration, including view, edit, and analysis | ||
\item On the fly projection of vector layers | ||
\item Map composer | ||
\item Identify features | ||
\item Display attribute table | ||
\item Select features | ||
\item Label features | ||
\item Persistent selections | ||
\item Save and restore projects | ||
\item Support for raster formats supported by the GDAL library | ||
\item Change vector symbology (single, graduated, unique value, and continuous) | ||
\item SVG markers symbology (single, unique value, and graduated) | ||
\item Display raster data such as digital elevation models, aerial photography | ||
or landsat imagery | ||
\item Change raster symbology (grayscale, pseudocolor and multiband RGB) | ||
\item Export to Mapserver map file | ||
\item Digitizing support | ||
\item Map overview | ||
\item Plugins | ||
\end{compactenum} | ||
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\section{Whats New in 0.7} | ||
Version 0.7 brings several important features, including projection support, a map composer, and better integration with GRASS. The major new features in this release include: | ||
\begin{compactenum} | ||
\item On the fly projection for reprojecting layers in different coordinate systems | ||
\item Map Composer for creating print layouts | ||
\item Toolbox for running GRASS tools from QGIS | ||
\item Raster graphing tool to produce a histogram for a raster layer. | ||
\item Raster query using the identify tool to get the pixel | ||
values from a raster | ||
\item New customizable settings for the digitizing line width, color, and selection color | ||
\item New symbols for use with point layers are available from the layer properties dialog | ||
\item Spatial bookmarks allow you to create and manage bookmarks for an area on the map | ||
\item Measure tool to measure distances on the map with both | ||
segment length and total length displayed as you click | ||
\item GPX loading times and memory consumption for large GPX (GPS) files | ||
has been drastically reduced. | ||
\item Digitizing enhancements, including the ability to capture data straight | ||
into PostgreSQL/PostGIS, and improvements to the definition of attribute tables | ||
for newly created layers. | ||
\item Raster Georeferencing plugin can be used | ||
to generate a world file for a raster by defining known | ||
control points in the raster coordinate system. | ||
\end{compactenum} | ||
|
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