IVerticalCoordinateTransform (Core 2.1.9 API)

```
public interface IVerticalCoordinateTransform
```
Defines an interface for transforming the vertical coordinate value of a feature when loading it.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`double`	`transform(int referenceIndex, double z)`	Transform the vertical coordinate of a feature.

- Method Detail
  - transform
```
double transform(int referenceIndex,
                 double z)
```
    Transform the vertical coordinate of a feature. The arguments to this method are intended to provide considerable flexibility for cases in which the data source features may not include a meaningful Z coordinate directly, but must obtain one from a supplemental or associated metadata source. Thus the reference index is also provided. Implementations may use the reference index as appropriate to access auxiliary data files. For example, a shapefile reader might use it to access the metadata in the DBF file associated with the Shapefile.
    
    Parameters:
    
    referenceIndex - an optional, supplemental index defined by the implementation.
    
    z - the vertical coordinate from the data source. In some cases, an implementation may elect to treat this value as undefined or meaningless and may derive a vertical coordinate from the reference index.
    
    Returns:
    
    a floating point value to be assigned to the feature according to the needs of the application.