Quantum GIS (QGIS) is a geographical information system (GIS) that works with many platforms and with other commercial software packages. It has all of the common GIS functions and features. Its plugins and core features allow you to visualize maps then edit and complete printable maps. You can assemble your data and analyze, edit and manage it till you have exactly what you want.
You don't have to convert to an internal format when viewing and overlaying data in different formats. Quantum GIS supports many types of formats including most of those supported by OGR library, digital elevation models, landsat imagery and aerial photography.
Its user friendly interface helps you create maps and explore spatial data interactively, using a variety of tools such as an overview panel, spatial bookmarks, vector diagram overlay and layering. You can create a map and add a copyright label for protection, a scale bar for enhanced readability and even a directional arrow.
Quantum GIS allows you to use the GPS tools to upload or download directly to a GPS unit. You can also convert GPS formats to GPX or even import and export GPX format.
If you have a web server equipped with UMN MapServer installed you can even publish your map on the internet, which is very convenient for sharing.
Quantum GIS has a community online at OSGeo which includes the source code and a bug tracker. You'll get plenty of support with help from the wiki, the people communicating in the forum, the OSGeo website and its accompanying blog.
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