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oracle.spatial.util
Class GroupingLOD1Generalization

java.lang.Object
oracle.spatial.util.GroupingLOD1Generalization

public class GroupingLOD1Generalization

extends java.lang.Object

Constructor Summary

GroupingLOD1Generalization()
Java class that groups LOD1 geometries to generalize.

Method Summary

java.util.ArrayList

typification(java.lang.String tableName, java.lang.String columnName, java.sql.Connection conn, double tolerance) Groups the LOD1 geometries.

Methods inherited from class java.lang.Object

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

Constructor Detail

GroupingLOD1Generalization

public GroupingLOD1Generalization()

Java class that groups LOD1 geometries to generalize. The LOD levels are as follows: LOD 4 - Full texture - Given by Navteq LOD 3 - Same geometry, no texture LOD 2 - "SIMPLIFIED GEOMETRY" LOD 1 - Extrude geometry -> Use footprint and average height LOD 0 - Group LOD 1 Geometry -> How?- This class resolves this issue. Footprints on ground must be merged like hull operation -> extrude This last operation is called typification. We assume during grouping that: - buildings' grounds are at z=0 plane and height is +ive.

Since:

JDBC Driver

Method Detail

typification

public java.util.ArrayList typification(java.lang.String tableName,
                                        java.lang.String columnName,
                                        java.sql.Connection conn,
                                        double tolerance)
                                 throws java.lang.Exception

Groups the LOD1 geometries. The LOD levels are as follows: LOD 4 - Full texture - Given by Navteq LOD 3 - Same geometry, no texture LOD 2 - "SIMPLIFIED GEOMETRY" LOD 1 - Extrude geometry -> Use footprint and average height LOD 0 - Group LOD 1 Geometry -> How?- This class resolves this issue. Footprints on ground must be merged like hull operation -> extrude This last operation is called typification. Execution plan: a) Ground plan computation using 3D MBR formation method in JGeometry class and then ignores the z-coordinates. Very cheap computation!i Dont use g3dconv since some geoms (buildings) may not touch the ground. b) Use sdo_sam.bin_layer function to get groups of buildings and then c) Use the convex_hull (concave hull later by Ying Hu) to combine a group into a single geometry. d) Use extrusion to get 3D geometries.

Parameters:

tableName - Table name where a bunch of groups of (3D Building) J3D_Geometry geometries to be generalized exist.

columnName - Column name of the table name where the geometries to be generalizaed exist.

conn - Database connection

tolerance - Tolerance

Returns:

an ArrayList of JGeometry (3D) geometries

Throws:

java.lang.Exception - if an error occurs.

Since:

Oracle Database 11g Release 2 (11.2)

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