Terrain Mapping: Perspective View (3 − D Draping Process) and 4 Parameters to Control Perspective View (Especially for GATE-Geospatial 2022)

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A projection mode in 3D applications that allows viewing from a perspective that can be controlled by navigating the scene or globe from a specified location. 3-D view of the terrain

Picture Shows a 3 - D Perspective View

3-D Draping Process

GIS users can rotate the surface, navigate the surface, or take a close-up view of the surface. The users can superimpose thematic layers such as land cover, or roads in a 3-D draping process.

Picture Shows 3-D Draping

Four Parameters Control the Appearance of a 3-D View

Diagram Shows Four Parameters of a 3-D View

Viewing Azimuth

The direction from the observer to the surface, range from and in a clockwise direction

Viewing Angle

The angle measured from the horizon to the altitude of the observer, ranging between 0 to .

  • means viewing directly from above.
  • means viewing surface directly ahead.

Viewing Distance

The distance between the viewer and the surface


The ratio between the vertical scale and the horizontal scale that useful for highlighting minor features.

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