This image shows the result of building extraction after preprocessing of building footprints. This image shows the result of building extraction before preprocessing of building footprints. Building footprints can be split with another feature class or by differences in elevation. To accurately represent these buildings, they need be split into their separate parts. Some building footprints may contain several roof types and roof parts. Run the Preprocess building footprints task to prepare the building footprints for a realistic 3D visualization. Preprocess building footprints (optional) It is not required if you have an accurate footprint feature class. Run the Extract building footprints task to optionally extract building footprints from lidar. To publish your buildings, expand the Publish buildings group task and follow the steps provided. These footprints require splitting, segmentation, and updating of the roof form attributes. ![]() Building footprints with one roof type within their boundary (for example, suburban areas) will produce higher-quality roof structures than footprints with multiple roof types (for example, city centers). A lidar point spacing of 3 feet or less is required, 1 foot or less is recommended. The quality of the roof structures is dependent on the quality of the input lidar and building footprint data. High-density lidar (point spacing less than 3 feet) and building footprint segmentation are needed to model complex roof structures. Procedural rules are then used to create the 3D roof structures. Attributes such as building height, eave height, and the roof form are extracted from the lidar and added to the building footprints. Publish buildingsīuildings with simple roof structures can be generated automatically from the lidar. Reprojection to Web Mercator with height in meters is only required if you want to use the published layers in a global web scene. This task publishes the ground elevation layer to your organization. The ground elevation layer can also be used to improve the ground in your scene. These surfaces are used to create buildings and vegetation layers. This task extracts three elevation surfaces from the LAS dataset: a ground elevation (dtm), a surface elevation (dsm), and a normalized surface elevation (ndsm). Extract elevation surfaces from LAS dataset To publish your ground elevation surface, click the Publish ground elevation surface task and follow the steps provided. The ground elevation layer can be used to enhance the existing elevation in your 3D scene. These layers are used to create buildings and vegetation layers.
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