FDO API Reference Feature Data Objects

virtual FDO_API const double FdoXmlSpatialContextReader::GetZTolerance  )  [virtual]
 

Gets the tolerance value for Z ordinates of the spatial context currently being read. Tolerances are used in some geometric tests, mostly for equality between coordinates. This occurs a frequently in spatial queries, especially with "on boundary" or "just touching" conditions. It is also an objective amount that can be used when formulating step distances for parametric curve interpolation.

Returns:
Returns the tolerance

Implements FdoISpatialContextReader.


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