This item is on our roadmap for Styler, a web cartography application.
Two standard features of any GIS styler are the presentation of unique values and
the composition of thematic maps.
Unique Values
Uniques values are useful when there are features of a few different categorical types, which should all be drawn differently. A good example is roads – you want your interstates, your highways, your primary roads, and your secondary roads to all look different. This item will provide “wizard”-type functionality to generate unique values, and work-flows that make it easy to further customize the style.
Thematic Maps
Thematic maps classify continuous data (e.g. incomes, ages, temperatures) into different colors, to display numeric information visually. GeoServer already has the ability to dynamically generate SLD documents from data sources, with support for equal intervals and quantiles, and creating color ramps using a number of categories supplied by the user. The main thing needed is a good UI to manipulate and manage the groups of rules that are generated by the server from the raw data.
Funding
This roadmap item is currently unfunded.
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Other Roadmap Items
Unique Values and Thematic Maps
Styling interfaces for thematic mapping require the classification of data, and the assignment of styles to each classification. This item would create a user interface for managing the style groups in a thematic map, and displaying the unique values in categorical data layers.
Editing Toolbar and Components
Funded: While there is rich editing available in OpenLayers there are now good default toolbars to make use of these in GeoExt that work well with the different OpenLayers persistence mechanisms.
Map Styling Tools (SLD editing)
A premier feature of GeoExt will be a powerful style editor, built on the SLD standard, that can be integrated in to any application to let users change how the map looks. This will build on the work of Styler, improving and integrating those components to allow standalone SLD editing in addition to server-side style administration. It should support a variety of user friendly tools to create complex styling rules with ease.