Cadcorp SIS API Methods

DefineNolDatum Method

Description

Creates a named Geodetic Datum in a Named Object Library, using the standard seven Bursa-Wolf parameters to modify WGS84, replacing any existing Geodetic Datum with the same name.

Syntax

Visual Basic
Public Function DefineNolDatum( _ ByVal datum As String, _ ByVal re As Double, _ ByVal rp As Double, _ ByVal dx As Double, _ ByVal dy As Double, _ ByVal dz As Double, _ ByVal ex As Double, _ ByVal ey As Double, _ ByVal ez As Double, _ ByVal m As Double, _ ByVal pm As Double _ ) As Integer

Visual Basic

Public Function DefineNolDatum( _
   ByVal datum As String, _
   ByVal re As Double, _
   ByVal rp As Double, _
   ByVal dx As Double, _
   ByVal dy As Double, _
   ByVal dz As Double, _
   ByVal ex As Double, _
   ByVal ey As Double, _
   ByVal ez As Double, _
   ByVal m As Double, _
   ByVal pm As Double _
) As Integer

Parameters

datum: The named Geodetic Datum to create, or replace.
re: The equatorial radius of the ellipsoid, specified in metres.
rp: The polar radius of the ellipsoid, specified in metres.
dx: The x shift to apply to the ellipsoid, specified in metres.
dy: The y shift to apply to the ellipsoid, specified in metres.
dz: The z shift to apply to the ellipsoid, specified in metres.
ex: The rotational adjustment about the x axis, specified in minutes of arc.
ey: The rotational adjustment about the y axis, specified in minutes of arc.
ez: The rotational adjustment about the z axis, specified in minutes of arc.
m: The correction scale factor, specified in parts per million. Use 0.0 for no scale correction.
pm: The Prime Meridian, specified in radians. At present, this parameter is ignored, and must be specified as 0.0.

Remarks

Available: GEO MM ME MD OM OD SISpy

Groups:

Example

sis.DefineNolDatum ("USER90", 6378206, 6356584, –4, –102, –129, -0.2570, 0.3410, -0.0880, 3.7230, 0)

Send comments on this topic.

Click to return to www.cadcorp.com