Aug 172010
 

The uDig open source GIS system is now available for download. The new version continues a good tradition of shapefile presentations and editing. In this article we will forward some of their own info about the system.

uDig is ok for basic stuff. On the plus side it gives you good access to spatial databases like PostGIS, ArcSDE, Oracle Spatial, MySQL and more. On the down side the set of tools for editing and doing spatial arithmetic’s is fairly poor. One should of course keep in mind that uDig is a framework for developing new tools using it as a library.

uDigs website is here: http://udig.refractions.net/

Features and capabilities of this release:

  • Access to GeoTools DataStores via a generic wizard allowing users to connect to many additional data formats and access all connection parameters.
  • One long standing difficulty with using large datasets is uDig wanting to know the bounds of the data (so it can efficiently search, zoom). For common spatial file formats this data is known and available; for large databases such as DB2 and PostgreSQL this can take some time to calculate. For the generic GeoTools DataStorewizard above we are experimenting with using bounds based simply on the valid area for coordinate reference system provided by the data.
  • The valid area of the coordinate reference system is also used when “clipping” WFS requests resolving some long standing issues when editing WFS services that do not update their Capabilities document.
  • Advanced: Control what features are requested for a layer using a Common Query Language (CQL) expression. The expression builder offers command completion with the full GeoTools? function list available as you type
  • Advanced: Cache support added allowing you to cache Raster layers in memory (please be working with large datasets as this is the first time uDig is allowing users to cache information in memory). Please note that raster file formats on disk are optimised and in may cases perform better than caching in memory. Caching in memory is recommended for formats such as jpeg (where the entire image must be loaded to display even a small section) and when working with data from a slow device such as the network or DVD.
  • Experimental: Cache support added allowing you to cache WFS layers in memory for increased performance (please be careful when working with large datasets as this is the first time uDig is allowing users to cache data in memory)
  • Enhanced Vector Editing
  • Revamped printing support, standard paper sizes are supported when printing
  • Import multiple layers into the catalog at once
  • switch between common map scales
  • Improved Drag and Drop support allowing multiple layers to be manipulated at once
  • Drag and Drop treats URL as a distinct content type across browser implementations
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