ArcObjects Library Reference (Geometry)  

IZ Interface

Provides access to members that identify geometric objects that can have 3D coordinates and defines operations on such objects. Note: the IZ interface has been superseded byIZ2. Please consider using the more recent version.

Product Availability

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.


IZ contains methods for setting Zs through interpolation based on existing Z values, Z values set at the From and To Points, and Z values from a FunctionalSurface.  Z values may also be set to a single constant value.  IZ also contains a method for determining if consecutive vertices exhibit a vertical relation.


Method CalculateNonSimpleZs Calculates the non-simple Z values by extrapolation/interpolation for polylines and interpolation for polygons.
Method InterpolateFromSurface Use the specified functional surface to generate Z values for the vertices of this object.
Method InterpolateZsBetween Generate Z values by linear interpolation for all vertices in the range [start+1, end-1].
Method MultiplyZs Multiplies all the Z values by a factor.
Method OffsetZs Offsets all the Z values by an offset value.
Method SetConstantZ Sets Z coordinates at all vertices to zLevel.
Read-only property ZMax The maximum Z value.
Read-only property ZMin The minimum Z value.
Read-only property ZVertical Indicates if at least two consecutive vertices of this polyline or polygon have the same x and y values, but distinct z values.

Inherited Interfaces

Interfaces Description
IZCollection Provides access to operations on Z-aware geometries.

CoClasses that implement IZ

CoClasses and Classes Description
Polygon A collection of rings ordered by their containment relationship; optionally has measure, height and ID attributes.
Polyline An ordered collection of paths; optionally has measure, height and ID attributes.

See Also

IPoint.Z Property | IZAware Interface | IZCollection Interface | IZ Interface