These existing obstacles are symbolized with blue dots, and the proposed obstacles associated with the construction are symbolized with large blue circles. On the map, you can see several obstacles that overlap with the approach surfaces at either end of this runway. The definition query is applied, and only the approach surfaces are shown on the map. You will be creating an OIS using the FAA FAR 77 geoprocessing tool. Aviation authorities, such as the FAA and ICAO, provide standards and specifications for OIS creation. Those penetrating obstacles may present a hazard to flight operations.ĪrcGIS Aviation Airports contains several geoprocessing tools to generate an OIS for different specifications. For this exercise, you are interested in obstacles whose heights intersect the OIS at any point on its slope down to the runway. This image shows that the height of the OIS (1) changes as the surface slopes down toward the runway (2). This image shows an approach OIS surface in 3D for a runway at a municipal airport. Obstruction identification surfaces (OIS) are multipatch or polygon features that represent the clearance between an aircraft in the air and obstacles on the earth's surface. Create obstruction identification surfaces Now you'll create surfaces for the airport that you will use to identify if any of the obstacles that you've added to the project will pose a hazard to aircraft. You'll create an approach surface later.Īn OIS includes the following components: The following diagram shows the types of surfaces contained in a typical obstruction identification surface. An obstruction identification surface is made of several component surfaces. The ObstructionIdSurface_MP feature class is empty, but the layer has been symbolized by surface type. Runway-A polygon feature class representing runways at SFO.Runwa圜enterline-A polyline feature class containing runway center line features at SFO.ObstructionIdSurface_MP-A multipatch feature class that will hold obstruction identification surfaces.AirportControlPoint-A point feature class containing airport elevation and runway displaced threshold features.VerticalStructurePoint-A point feature class that will hold obstacle features.In the Contents pane, you will find the following features: The project contains layers of points, lines, and polygons that represent features at San Francisco International Airport (SFO).