GIS应用开发课件4.ppt

object name = Newfoundland; object alias = NF_LAB; object abbreviation = NF; object remarks = Most Eastern Province in Canada; object usage = When making maps of Newfoundland; object geographicCoordinateSystemObject = geographicCoordinateSystem as object; object unitObject = unit as object; object projectionObject = projection as object; object parametersObject = parameters as object; projectedCoordinateSystemEdit.Define( ref name, ref alias, ref abbreviation, ref remarks, ref usage, ref geographicCoordinateSystemObject, ref unitObject, ref projectionObject, ref parametersObject); return projectedCoordinateSystemEdit as IProjectedCoordinateSystem; } Creating a custom vertical coordinate system The ISpatialReferenceFactory3 interface allows you to create the Datum, VerticalDatum, and LinearUnit component parts. These components can also be created using a similar Define method available on their classes. private IVerticalCoordinateSystem CreateVerticalCoordinateSystem() { ISpatialReferenceFactory3 spatialReferenceFactory = new SpatialReferenceEnvironmentClass(); IVerticalDatum verticalDatum = spatialReferenceFactory.CreateVerticalDatum((int)esriSRVerticalDatumType.esriSRVertDatum_Taranaki); IHVDatum hvDatum = verticalDatum as IHVDatum; ILinearUnit linearUnit = spatialReferenceFactory.CreateUnit((int)esriSRUnitType.esriSRUnit_Meter) as ILinearUnit; IVerticalCoordinateSystemEdit verticalCoordinateSystemEdit = new VerticalCoordinateSystemClass(); object name = New VCoordinateSystem; object alias = VCoordinateSystem alias; object abbreviation = abbr; object remarks = Test for options; object usage = New Zealand; object hvDatumObject = hvDatum as object; object unitObject = linearUnit as object; object verticalShift = 40 as object; object positiveDirection = -1 as object; ve