Latest Headlines

OGC Releases Geography Markup Language version 3 02.07.03

GML 3 is modular, meaning that users can select out only the parts necessary for use, which simplifies and minimizes the size of implementations.

The Open GIS Consortium (OGC) announced the approval and release of Geography Markup Language version 3 (GML 3). GML 3 defines a data encoding in XML that allows geographic data and its attributes to be moved between disparate systems with ease. The new release is modular, meaning that users can select out only the parts necessary for use, which simplifies and minimizes the size of implementations. New additions in GML 3 include support for complex geometries, spatial and temporal reference systems; topology; units of measure; metadata; gridded data; and default styles for feature and coverage visualization.

GML 3 is almost entirely backwards compatible with GML 2 so that developers and users familiar with GML 2 can begin working immediately with GML 3. Like GML 2, GML 3 will play a key role in both spatial data encoding and transport, and in the description of geographic objects for geospatial Web services.

Kurt Buehler, OGC CTO, explains, “GML 3’s modular structure means that those choosing to use GML can literally pick out the schemas or schema components that apply to their work. GML 3.0 also includes a sample packaging tool that creates a tailored schema containing only the required components from the GML core schemas.” Buehler also pointed out that it is OGC’s intention that this very broad specification, with more than 1,000 new tags covering over 400 pages, remains relatively unchanged, save for minor bug fixes over the next year or so. This stability will give potential implementers time to learn about and use GML 3 effectively.

Ron Lake of Galdos Systems, who pioneered GML 1.0 and led the subsequent growth of the specification, makes clear, “the new features are designed specifically to address real world problems.” For example, new in GML 3 is the ability to store topology (the relationships between features), geometric curves and time information. The storage of topology is a key requirement for organizations like the Ordnance Survey Great Britain, which uses GML to store its nationwide data layers. Topology is also required for routing applications popular in location-based services. Those working with highway designs and other transportation-related data require accurate curve definitions. Time information is essential in tracking applications (like monitoring ambulance locations) and exploring the movement and growth of natural disasters such as floods and fires over hours, days or months.

The GML 3 specification was submitted by OGC member organizations CSIRO Australia, Galdos Systems (Canada), interactive instruments (Germany), BAE SYSTEMS Mission Solutions (U.S.), US Census Bureau, POSC (U.S.), MapInfo Corp. (U.S.), Oracle Corp. (U.S.), NTT Data Corp.(Japan), and Laser-Scan Ltd. (UK) and is available for download at

Did you enjoy this article? Click here to subscribe to POB.

You must login or register in order to post a comment.



Image Galleries

HxGN Live

More than 3,500 attendees from more than 70 countries attended HxGN Live, the annual Hexagon AB user conference, at the MGM Grand Hotel & Casino in Las Vegas on June 3-6. About 450 keynotes and panel discussions were held, and several companies from around the world exhibited their geospatial products. Here are a few snapshots from the event.


POB May 2015 Cover

2015 May

In this May 2015 issue of POB, we take a look at the keynote on technology in the information age given by Andy Lowery, DAQRI CEO, at this year's SPAR International.

Table Of Contents Subscribe


Surveyors, with the weather finally starting to improve everywhere, are you thinking about the long days to come? This summer, you are going to …
View Results Poll Archive

Point of Beginning Store

M:\General Shared\__AEC Store Katie Z\AEC Store\Images\POB\epubsite\Statues-pic-large.gif

The perfect gift or award for any special occasion.

More Products

Clear Seas Research

Clear Seas ResearchWith access to over one million professionals and more than 60 industry-specific publications, Clear Seas Research offers relevant insights from those who know your industry best. Let us customize a market research solution that exceeds your marketing goals.


Facebook logo Twitter logo  LinkedIn logo  YouTube logoRPLS small logo

Google +

Geo Locator

Buyers Guide

The #1 buyers' guide for land surveyors and geomatics professionals. Search listings for software and equipment manufacturers, equipment dealers and professional services. CLICK HERE to view GeoLocator.