Local scene

A local scene is a view mode that projects the terrain and layers on a planar surface rather than on a ellipsoid. Local scenes can be used for displaying or analyzing data at the local or city scale and are valuable for urban planning and visualizations when you want to view defined areas such as campus facilities or building developments. They can also be used to represent the entire world, and have the option of using a fixed extent that can be clipped to the dimensions of your layers.

Local scene

Set world origin

The world origin defines the origin of the GIS scene. In a local scene, you can define the Origin position by setting the following values.

  • X (Longitude) : Specifies the east–west position of a point on the Earth's surface. A projected position value for projected coordinate systems or a longitude value for geographic coordinate systems.
  • Y (Latitude) : Specifies the north–south position of a point on the Earth's surface. A projected position value for projected coordinate systems or a latitude value for geographic coordinate systems.
  • Z (Altitude) : The vertical distance of the camera above the terrain.
  • Spatial Reference WKID : The spatial reference of the X, Y and Z values in well-known ID (WKID).

Set up a camera

You need to set a camera for the GIS data to be loaded in your scene. You can set the following values to define the camera position within the scene.

  • X (Longitude) : Specifies the east–west position of a point on the Earth's surface. A projected position value for projected coordinate systems or a longitude value for geographic coordinate systems.
  • Y (Latitude) : Specifies the north–south position of a point on the Earth's surface. A projected position value for projected coordinate systems or a latitude value for geographic coordinate systems.
  • Z (Altitude) : The vertical distance of the camera above the terrain.
  • Spatial Reference WKID : The spatial reference of the X, Y and Z values in well-known ID (WKID).
  • Heading: Provides the ability to either get or set the map view rotation value. This is also known as yaw or azimuth. It represents the number of degrees by which the map's data will be rotated, measured counterclockwise from the north. To rotate clockwise, use a negative value.
  • Pitch: Provides the ability to either get or set a map view's pitch. Pitch is the equivalent of moving a plane's nose up or down (rotating along the axis that passes through the plane's wings). Positive values, looking forward, are above the horizon (pointing upward) and negative values are below the horizon (pointing downward).
  • Roll: Provides the ability to either get or set a map view's roll. Roll is the equivalent of tilting a plane's wings up or down (rotating along the axis that passes through the center of the plane from front to back). A zero value is perfectly horizontal. Positive values will tilt the left side upward (or right side downward). Negative values do the opposite.

Basemap

A basemap provides a background of geographical context for the content in your scene. ArcGIS Maps SDK for Unreal Engine includes a basemap gallery with a variety of choices, including topography, imagery, and streets.

You can use web maps that are collection of layers, an operational layer or a basemap layer, as a basemap. Also, you can use raster tile layer (image tile layer) as a basemap.

Elevation

Elevation layers can help with 3D visualizations by creating relief in your 3D scene. Elevation surfaces define height values across the extent of a map or scene. Other layers are usually draped on top of the elevation layer. In most cases, data for an elevation layer comes from an elevation service.

Map extent

In a local scene, you can clip the basemap and layers to the custom extent of your view. This is useful for increasing performance, focusing on key elements of your project, and interacting with layers that are underground.

The map extent is defined by a series of bounding coordinates that delineate the area of the map or scene with which you want to work.

Values for extent

  • X (Longitude) : Specifies the east–west position of the center of the extent. A projected position value for projected coordinate systems or a longitude value for geographic coordinate systems.
  • Y (Latitude) : Specifies the north–south position of the center of the extent. A projected position value for projected coordinate systems or a latitude value for geographic coordinate systems.
  • Spatial Reference WKID : The spatial reference of the X and Y values in well-known ID (WKID).
  • Width : Side to side measurement of the extent. It's the radius value when the extent shape is a circle. The units depends on the spatial reference.
  • Height : Base to top measurement of the extent. The units depends on the spatial reference.

Use API keys

An API key can be used to authorize access to ArcGIS Online services and resources from your app, as well as to monitor access to those services. You can use a single key for all requests made by your app, or assign individual keys for classes that expose an API key property. See API keys in the security and authentication topic for details.

Learn how to use

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