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oracle.spatial.util
Class Generalization3D

java.lang.Object
oracle.spatial.util.Generalization3D

public class Generalization3D

extends java.lang.Object

Constructor Summary

Generalization3D()
Java class that generalizes 3D buildings for different LOD levels.

Method Summary

J3D_Geometry

groundPlanSimplification(J3D_Geometry A, java.sql.Connection conn, int choice, double tolerance) Simplifies input 3D building geometry.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Generalization3D

public Generalization3D()

Java class that generalizes 3D buildings for different LOD levels. The LOD levels are as follows: LOD 4 - Full texture - Given by Navteq LOD 3 - Same geometry, no texture LOD 2 - "SIMPLIFIED GEOMETRY"-> How?- This class resolves this issue. We either keep ground footprint kept unchanged (choice = 1) or, simplify footprint to reduce faces (choice = 0). Roofs are ignored. LOD 1 - Extrude geometry -> Use footprint and average height LOD 0 - Group LOD 1 Geometry -> Footprints on ground must be merged like hull operation -> extrude This last operation is called typification. We assume during generalization for LOD2 that: - building's ground is at z=0 plane and height is +ive. - building has one store i.e., the ground is connected to roof polygons via single level of polygon. - building has ground polygon(s) defined implicitly -> In other words, we deduce ground plan from side walls of the building. - If ground plan is explicitly defined (NOT supported), we need to deduce ground plan directly from polygon(s) having z-coordinates equal to zero within tolerance (epsilon). Then, use getGroundPlan_old function for this case.

Since:

JDBC Driver

Method Detail

groundPlanSimplification

public J3D_Geometry groundPlanSimplification(J3D_Geometry A,
                                             java.sql.Connection conn,
                                             int choice,
                                             double tolerance)
                                      throws java.lang.Exception

Simplifies input 3D building geometry. LOD 4 - Full texture - Given by Navteq LOD 3 - Same geometry, no texture LOD 2 - "SIMPLIFIED GEOMETRY"-> How?- This function simplifies at this level. We either keep ground footprint kept unchanged (choice = 1) or, simplify footprint to reduce faces (choice = 0). Roofs are ignored. LOD 1 - Extrude geometry -> Use footprint and average height LOD 0 - Group LOD 1 Geometry -> Footprints on ground must be merged like hull operation -> extrude This last operation is called typification. We assume during generalization for LOD2 that: - building's ground is at z=0 plane and height is +ive. - building has one store i.e., the ground is connected to roof polygons via single level of polygon. - building has ground polygon(s) defined implicitly -> In other words, we deduce ground plan from side walls of the building. - If ground plan is explicitly defined (NOT supported), we need to deduce ground plan directly from polygon(s) having z-coordinates equal to zero within tolerance (epsilon). Then, use getGroundPlan_old function for this case.

Parameters:

A - J3D_Geometry geometry which is input (original) 3D building

conn - Database connection

choice - 1: Simplification using building ground plan, 0: Simplification using simplified building ground plan.

tolerance - Tolerance

Returns:

a J3D_Geometry (3D) geometry,

Throws:

java.lang.Exception - if an error occurs.

Since:

Oracle Database 11g Release 2 (11.2)

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