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Provides access to members that specify the spatial and M tolerances of a spatial reference.
Use the ISpatialReferenceTolerance interface to define default and user-specified XYTolerance and ZTolerance parameters utilized by the topology engine when performing geometric and relational operations on geometries associated with this spatial reference. This interface also provides access to define the MTolerance used by the geometric and relational operations associated with this spatial reference.
Name | Description | |
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IsMToleranceEqual | Returns true if the measure tolerances of the two spatial references are the same. | |
IsXYToleranceEqual | Returns true if the XY tolerances of the two spatial references are the same. | |
IsZToleranceEqual | Returns true if the Z tolerances of the two spatial references are the same. | |
MTolerance | The tolerance used to determine equality of M values. | |
MToleranceValid | Returns true if the M tolerance is well defined (not NaN) and >= the minimum M tolerance. | |
SetDefaultMTolerance | Sets the default tolerance used to determine equality of M values (2.0 * m resolution). | |
SetDefaultXYTolerance | Sets the default cluster tolerance used to control point coalescing in the X and Y dimensions (the equivalent of 1 mm in the current spatial reference units). | |
SetDefaultZTolerance | Sets the default value for the Z cluster tolerance used to control point coalescing strictly along the Z axis (the equivalent of 1 mm in the current vertical coordinate system units). | |
SetMinimumMTolerance | Sets the minimum tolerance (i.e., pre 9.2) used to determine equality of M values (2.0 * m resolution). | |
SetMinimumXYTolerance | Sets the xy cluster tolerance to be 2.0 * resolution. Use this value for compatibility with pre-9.2 topological and relational operators. | |
SetMinimumZTolerance | Sets the minimum value for the Z cluster tolerance (i.e., pre 9.2) used to control point coalescing strictly along the Z axis (the equivalent of 1 mm in the current vertical coordinate system units). | |
XYTolerance | The xy tolerance used to control point coalescing in the X and Y dimensions. | |
XYToleranceValid | Returns esriSRToleranceOK if the XY tolerance is well defined (not NaN) and >= the minimum XY tolerance. | |
ZTolerance | The tolerance used to control point coalescing strictly along the Z axis. | |
ZToleranceValid | Returns true if the Z tolerance is well defined (not NaN) and >= the minimum Z tolerance. |
Classes | Description |
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GeographicCoordinateSystem | Creates a geographic coordinate system. |
ProjectedCoordinateSystem | Creates a projected coordinate system. |
UnknownCoordinateSystem | Creates an unknown coordinate system. |
The tolerance values for a spatial reference remain NaN until they are either set explicitly using one of the methods or properties available on this interface or as a result of calling a method which defines the resolution of the spatial reference, including ISpatialReference::SetDomain, ISpatialReference::SetZDomain, ISpatialReference::SetMDomain, ISpatialReference::SetFalseOriginAndUnits, ISpatialReference::SetZFalseOriginAndUnits and ISpatialReference::SetMFalseOriginAndUnits. These methods will set the corresponding tolerance to its minimum value if it is currently undefined (NaN).
It is generally good practice to check the validity of the tolerance after setting it using any of the available methods.