6/10/2023 0 Comments Make polygon multipatch arcproFor example, when planting a tree on the roof of a building, if your trees feature class is not z-aware, then the new feature you create will in fact be a 2D feature with a height equal to zero (0). If the feature class is not z-aware, then you may not get the expected results. Type in the exact z-value of the feature.Interactively move an existing feature up and down to set its height.Interactively place a feature on a surface or on top of other existing features (for example: plant a tree on the rooftop of an existing building).When editing features that store the z-value in their geometry, you can Setting feature heights using feature geometry For example, an airplane might have the attribute, height above ground, so to display this feature with the correct elevation, you need to set its base height properties as draped (option 1: Elevation from surface) plus an offset from the attribute (option 2: Elevation from features as an expression using feature attributes). The three options described above are additive and not mutually exclusive. The offset you specify is added to the current z-value. Layer offset: This option lets you specify a constant offset to all the features in your feature layer.You can also use the feature attributes in the expression so that the heights are set based on one or more attribute values of the feature. Use a constant value or expression-Applies a constant value or custom expression for determining the elevation of the features.This option is unavailable for 2D features. Features are displayed at the height specified by their z-value. Use elevation values in the layer's features-This is the default for 3D feature layers.If an elevation surface is defined, the features sit exactly on the ground. No feature-based heights-Choose this option if you do not want to use the 3D geometry of the layer to derive height.Elevation from features: Depending on your data, there are different options here.Also, if the underlying surface is improved, then the displayed heights of the features draped on it will also improve automatically. Elevation from surface: By draping a layer on a surface, you are removing the need to define and maintain z-values for your features.You do not need to be in an edit session to define elevation (z-values) for a feature layer. The different options available to define the elevation source are elevation derived from a surface, directly from the features, or as a constant offset to the layer. The elevation properties of a layer can be set on the Base Heights tab in ArcScene on the Layer Properties dialog box. There are several options for setting the elevation source of your feature layer. Defining where z-values come from for a feature layer For multipatch features, the relative height of the 3D object (for example, a building) must be stored in the feature geometry. For line or polygon features, if the data needs different heights per vertex, then the z-values need to be stored in the feature geometry. For point features, either option is recommended. If your features do need z-values, then there are two options on how the base height (z-value) can be stored in the feature- either within the geometry (shape) field or as a feature attribute. The best practice is to create and maintain z-values for features only when they cannot be applied on the fly from a surface, such as a raster DEM, TIN, or terrain dataset. Other features-such as viewpoints on top of structures or 3D flight paths-need z-values to define their position in 3D space that is distinct from a surface. Many features-such as benches or roads that lie on an elevation surface-do not need a z-value at all but, rather, can be 2D features that get their displayed heights assigned on the fly from an underlying surface layer. Setting the height, or z-value, of the GIS features being edited is a critical part of the 3D editing experience. You can visualize more realistically your creation and placement of features, as well as easily fix errors or change values in the 3D space.
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