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DMA Release 0.8 Copyright ©1995 by Genesis Project, Ltd. All Rights Reserved. MiscZoneUTMCoord Inherits From: MiscUTMCoord : MiscCoord : Object Declared In: misckit/miscgiskit/MiscZoneUTMCoord.h Class Description A MiscZoneUTMCoord object contains points in the one of the 60 zones of the International Universal Transverse Mercator Projection (1924) described in the UK Ordinance Survey document, Transverse Mercator Projection, Constants, Formula and Methods", March 1983. All distances are in meters. International UTM Zones are 6 degrees apart starting at 3 degrees east of Longitude 180 and proceed East. The Greenwich meridan is bracketed by Zone 30 and 31. Zone Numbering starts from 1 and ends at 60. MiscZoneUTMCoords use a MiscPlanetCoordConverter object as the default convertor for convert:to: operations (See MiscCoord). This related class is invisible to the user and handles conversion between the basic types discussed above. The first time MiscZoneUTMCoord is created that is in a heretofore unused zone, a single instance of a MiscUTMConstants object is created with values particular to that zone's grid. World coordinate of True Origin: Latitude 0.0 N, Longitude (set according to zone number) True origin offset from grid origin: 500000.0 meters East , 0 meters North Spheroid: a=6378388.000 meters, b=6356911.946 meters Scaling at Central Meridian: 0.9996 These invisible constants objects are shared by all future instances of MiscZoneUTMCoord that are created. They are protected against deletion. Instance Variables unsigned int zoneNumber; zoneNumber The UTM zone number which this coord is in. Method Types Initialization - initDescription:zone: Archiving - write: - read: - awake Instance Methods awake - awake Connect to the zone constants for the zone of the unarchived object. You should never invoke this method directly. Returns self. See also: - write:, - read: initDescription:zone: - initDescription:(char*)textString zone: (unsigned int) utmzone Designated initializer for the MiscZoneUTMCoord class. textString is copied and may be used in describing the set of points. utmzone is a number between 1 and 60 that identifies which International UTM Zone is desired. A zone number of zero will be set to zone 1; a zone greater than 60 will be set to zone 60. The new object will initially have space for one point. The default conversion contractor for conversion between coordinate systems is set to be the instance of PlanetCoordConverter. read: - read:(NXTypedStream *)stream Reads the object from the typed stream stream. Returns self. See also: - write:, - awake write: - write:(NXTypedStream *)stream Writes the object to the typed stream stream. Returns self. See also: - read:, - awake
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