![]() In an OpenGIS context, the elements PostGIS, MapServer and GeoServer are the other three components that make up an enterprise-level GIS system. the desktop application for editing GIS data. uDig would be analogous to ArcGIS from ESRI, i.e. UDig supports OpenGIS and other de facto industry standards and has a user-friendly GUI. Refractions offers consulting and systems integration services related to enterprise-level geospatial applications. The application was initiated and is hosted by the Canadian firm Refractions Research it is currently developed by an international community of contributors. Our program uDig, then, is a Java-based open source desktop GIS platform built on top of the Eclipse Rich Client Platform. I would further add that one can integrate any kind of geographic information and then find relationships among that information, and display it how you wish. A more accurate description is, as the folks at Quantum GIS say, that a GIS is a collection of software that allows you to create, query and analyze geospatial data. While this description is a bit oversimplistic, it captures the broad purpose of GIS. To those who are new to GIS I generally tell them it involves "mapping with a computer". ![]() The Michigan Geographical Library has data for download that illustrates the (theoretical) land cover in the state from the early 1800s in the shapefile format, one of the most common geospatial data formats. To illustrate some of uDig's basic features, I will download and load geospatial data related to land cover in my own Ingham County, Michigan before European settlement occurred. In this particular article I will install and explore an example with uDig. Just pop the term “GIS” into the search box here at the site and you'll get a nice list of articles. One of these previous articles is a general introduction to QGIS while the other illustrates how to integrate GIS data into QGIS. In earlier articles, I covered another great GIS application, Quantum GIS (QGIS). uDig is for GIS users of all levels, from beginners to advanced. Part of an ongoing series of on open-source geographic information system (GIS) programs, this article offers an introduction to uDig GIS.
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