Copyright (c) 2005 Norut IT, All Rights Reserved. AIS based vehicle tracking - GML Application schema Allways in UTC timeframe (YYYY-MM-DDThh:mm:ss) Vessel Identification according to the IMO AIS standards Allways in UTC timeframe (YYYY-MM-DDThh:mm:ss) In meters In meters In meters In decimal deegrees of angle In decimal deegrees of angle In decimal deegrees of angle In knots Units as defined for IMO AIS ? Free text Organizational source of data for the object of which this element is a member, used at several levels and may represent a data service provider, a data management sys., an AIS transmission sys., etc. Inherits the pointMemberType of gml. This 'time slice' type encapsulates the various dynamic properties of AIS objects at a given point in time and space Time represents here the AIS message time stamp (mandatory) SOG as defined for AIS messages (optional) COG as defined for AIS messages (optional) Heading as defined for AIS messages (optional) Bearing, not currently defined for AIS messages (optional) Rate Of Turn as defined for AIS messages (optional) Status free text as defined for AIS messages (optional) optional dataSource (optional) represents here the infrastructure supplying the AIS message The track of an object is a sequence of specialized timeslices (i.e. ObjectStatus) that indicate the dynamic status of the object. Inherits srsName attribute of abstract geometry type for defining SRS for this entire track, i.e. all geometry elements within this track are interpreted under the given SRS, unless differently specified at a lower level for each geometric element. This is applied as the geometry property of a feature, so that general GML tools can interpret that each feature is associated with a given geometry - NB! it contains no attribute group refering to gml:AssociationAttributeGroup An AIS feature encloses static, voyage-related, and dynamic/historic info of a single AIS object (typically a response to time and geometry bounded request for tracking-data of an identifyable vehicle) mandatory mandatory mandatory optional optional optional optional optional optional optional optional optional optional optional Time (optional) represents here the time of creation of this feature as a "snapshot" of history, which implies the latest possible time of an AISObjectStatus within the feature. Should be identical to - and omitted here - given the enclosing feature collection's time dataSource (optional) represents here the generating organizational source for this feature, e.g. coastal traffic authorities collecting AIS messages from a fleet. Should be identical to - and omitted here - given the enclosing feature collection's dataSource This is the concrete request element used to query a service for AIS features Extends the Bounding Box type of gml, giving the geometric boundaries for the requested AIS Features. The object status reports included in the track of each AISFeature must have position within the bounding box, AND have time value that lies within the time period specified by the 'to'/'from' elements. However, the requesting part can specify the 'requireLastPos' with value' true' to indicate that the temporally "last known position" object status should be included in each features track (mandatory) The starting time period endpoint (optional) The ending time period endpoint, if not present the time period should be interpreted as ending "now", i.e. the current timepoint as the request is processed If a requestID is given here, it shall be set as the value of the 'requestID' element of the AISFeatureCollection returned as the response to this request If set to 'true', the requesting part requires each AISFeature's temporally last (within the specified time period) AISObjectStatus to be included in it's AISTrack, even though the geometric position may fall outside the specified geometry of the envelope Indicates, in number of seconds, the appropriate temporal resolution for the AISTracs of the response. If objects are positioned by a positoning service every 10 seconds, a value of 120 given here by the requesting part, would mean that only every 12th position is included in the track - i.e. one AISObjectStatus for every 2 minutes If given, this is regarded as a criteria for the query, such that only a feature with this MMSI is included in the response This is the concrete response element used to query a service for AIS features An AIS feature collection encloses a set of AIS features - usually as a response to a request/query that is bounded in time and geometry. If an requestID was given by the requesting part, it's value shall be set here Time (optional) represents here the time of creation of this feature collection as a "snapshot" of history, which allso implies the latest possible time of an ObjectStatus within the collection DataSource (optional) represents here the generating organizational source for this feature collection, e.g. coastal traffic authorities collecting AIS messages from a fleet