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

Z-Scale

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

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