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Related Standards

Public review: MovingObjectSnapshot Standard

OGC Invites Comments on MovingObjectSnapshot Standard

Wayland, MA, USA. July 23, 2010.

The Open Geospatial Consortium, Inc. (OGC) is seeking public comment on a Geography Markup Language (GML) XML encoding for describing the characteristics of a moving object, such as a GPS enabled car. This candidate standard provides a way of describing in simple terms the motion of an object, such as a car driving through city streets or a person walking in a park.

This candidate standard fills a need for "lightweight" packets of tracking information, such as direction and velocity that can be communicated between diverse platforms and applications supporting mobile location-aware devices. The GML encoding used in this candidate standard is compatible with a wide range of other standard encodings used in other communities, such as emergency services.

The candidate standard and information on submitting comments on this document are available at:

The public comment period closes on August 23rd, 2010.

About MovingObjectSnapshot

OGC MovingObjectSnapshot: An Application Schema of the OGC Geography Markup Language. Edited by George Percivall and David Burggraf. From Open Geospatial Consortium Inc. Candidate OGC Discussion Paper. Document subtype: GML Application Schema. Version: 0.6. OGC Reference Number: OGC 10-034r3. Date: 2010-06-16.

This document defines the OGC MovingObjectSnapshot that encodes properties that describe the motion of an object. The MovingObjectSnapshot is an application schema of the OGC Geography Markup Language (GML) Version 3.2. The motion described by MovingObjectSnapshot is intended for simple use cases such as a car driving through city streets or a person walking in a park.

This document defines a GML application schema to encode a snapshot of a moving object including its location, translational velocity and acceleration. This specification addresses the use case of a solid object, such as a car, travelling in a plane local to the object, such as a street. The velocity is an instantaneous vector composed of a scalar speed and a heading relative to North... Data using this specification shall produce an XML document compliant with MovingObjectSnapshotType as defined in the schema with namespace

Intended Use Cases: Typical use cases for the moving object defined in this specification are a car driving through city streets or a human walking in a park. The velocity defined in this specification is applicable to the instantaneous, translational motion of an object moving relative to a two-dimensional plane. The object may be a single point or the centre of mass of a rigid body, such as a car. The coordinate system is a Local Tangent Plane that includes North as a coordinate axis.

The OGC Sensor Web Enablement (SWE) standards address motions and coordinate reference frames more complex that the use case of this MovingObjectSnapshot specification.

[...] Present Position: The instantaneous position of the object in MovingObjectSnapshot is defined using the GML Point Profile. GML Point Profile defines the location of a point using geographic latitude and longitude in degrees. The coordinates in the GML Point Profile are defined in a coordinate reference system known as EPSG:4326 and formally identified in OGC by the URN identifier: urn:ogc:def:crs:EPSG::4326... A MovingObjectSnapshot element allows the user to describe the present time, position, along with the speed, heading, acceleration and elevation of an object constrained to a plane. The latter are not part of the object but can be added as additional properties which are defined in the schema. The MovingObjectSnapshot is defined by [an] XML Schema...

About OGC

The OGC is an international consortium of more than 395 companies, government agencies, research organizations, and universities participating in a consensus process to develop publicly available geospatial standards. OGC Standards empower technology developers to make geospatial information and services accessible and useful with any application that needs to be geospatially enabled. Visit the OGC website at:


Lance McKee
Senior Staff Writer
Open Geospatial Consortium (OGC)
Tel: +1-508-655-5858

Prepared by Robin Cover for The XML Cover Pages archive. See general references in Geography Markup Language (GML).

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