This assumption can be problematic, particularly if x,y units are geographic (latitude-longitude). If no units are defined, ArcGIS will assume that the z-units match the x,y units. The units and datum for a feature class's z-values should be defined on the containing feature dataset (if one exists) or on the feature class itself (if there is no feature dataset). Both methods are fully supported in the display and analysis of the resulting 3D feature class. The values can represent absolute heights or relative-to-ground heights. Z-values are used for representing the shape and elevation of your multipatch features. Learn more about converting 2D features to 3D features What do the z-values represent? Learn more about creating new 3D feature classes To create a new multipatch feature class, simply choose Multipatch Features from the Type drop-down menu when defining the feature class's geometry. How do I create a multipatch feature class? You can use the Is Closed geoprocessing tool to verify that a multipatch is properly closed.Įxamples of multipatch features include textured buildings, lamp posts, trees, subsurface geologic formations, underground structures, or certain types of analytic surfaces. The patches must not intersect each other, and there must be no gaps or empty spaces in the shell. The patches it is composed of must all have the same counterclockwise orientation of their coordinates and participate in defining the shell of the volume. The feature must represent one distinct volume. For a multipatch to be considered closed, it must be constructed in the correct fashion. Closed multipatches may be used in additional analysis tools, such as Union 3D and Intersect 3D. Some multipatch features are considered closed, meaning they properly define a volume. While it is possible to model the base z-value of a multipatch using a numeric feature attribute, this option may not support all the same analysis and interaction options that are available when using embedded z-values. All multipatches store z-values as part of the coordinates used to construct patches.
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