The Global Spatial Data Model (GSDM)

Earl F. Burkholder, PS, PE

Global COGO, Inc.

Las Cruces, New Mexico 88003

Email: globalcogo@zianet.com

Link to full paper

Spatial data are 3-dimensional (3-D) and modern measurement systems collect data in a 3-D environment. Computer data bases store 3-D digital spatial data. Human perception of spatial relationships is primarily visual and, due to gravity, our natural reference for spatial experience is horizontal (2-D) and vertical (1-D). Various models are used to establish a conceptual connection between the measurements, digital spatial data, and its representation - data visualization. Digital spatial data are also used to make analog products such as maps, charts, and other hardcopy diagrams. Conference organizers have invited consideration and discussion of a variety models which are being or can be used to accommodate the many facets of spatial data endeavors.

The global spatial data model (GSDM) described in this presentation is a collection of concepts and procedures which can be used to collect, organize, store, process, and manipulate 3-D spatial data. The GSDM uses one set of solid geometry equations which are equally applicable around the world. From this simple standard (which preserves global interoperability), each discipline, agency, corporation, or individual spatial data user has complete freedom to implement any derivative use or application.

The GSDM includes both a functional model and a stochastic model. The functional model encompasses the geometry of spatial relationships and the stochastic model defines the process for establishing, tracking, and reporting the accuracy of spatial data using standard procedures.

For additional information, see www.zianet.com/globalcogo/.

Suggested time: 20 minutes for presentation plus time for discussion.

Audio/visual: Overhead projector for transparencies, lapel mike for voice.

I have a laser pointer or can use one provided.

Optional: Prototype, DOS-based, menu-driven 3-D coordinate geometry software which includes standard deviations and error propagation (called BURKORD(TM)) is available and can be demonstrated on any standard PC (with 386 chip or newer). It could be done in about 10 minutes at end of the formal presentation (I have a laptop, but would need a projector) or off-line for a small group gathered around a PC.