ST_ComputeViewShedSurface

Syntax

meshgeom  ST_ComputeViewShedSurface(scene sc, cstring viewpoint);

Return value

Returns a meshgeom object.

Parameters

Description

This function calculates the visible surface based on a scene object and a viewpoint. The visible surface consists of the visible triangular patches from the scene object. The viewpoint information must be provided in the same JSON format that is used by the ST_ComputeFrustum function. The following figures show an example:

• Scene object

  

• Visible surface

  

Example

SELECT ST_NumPatches(ST_ComputeViewShedSurface(scene, '{"x" : 2938, "y" : 750, "z" : 90, "h" : 1.8, "azimuth" : 90, "pitch" : -35, "horizontalFov" : 90, "verticalFov" : 60, "distance" : 600, "depthMapSize" : 128}')) from t;
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