Most LRS functions have formats that end in _3D: for example, DEFINE_GEOM_SEGMENT_3D, CLIP_GEOM_SEGMENT_3D, FIND_MEASURE_3D, and LOCATE_PT_3D. If a function has a 3D format, it is identified in the Usage Notes for the function in SDO_LRS Package (Linear Referencing System) .
The 3D formats are supported only for line string and multiline string geometries. The 3D formats should be used only when the geometry object has four dimensions and the fourth dimension is the measure (for example, X, Y, Z, and M), and only when you want the function to consider the first three dimensions (for example, X, Y, and Z). If the standard format of a function (that is, without the _3D) is used on a geometry with four dimensions, the function considers only the first two dimensions (for example, X and Y).
For example, the following format considers the X, Y, and Z dimensions of the specified GEOM object in performing the clip operation:
SELECT SDO_LRS.CLIP_GEOM_SEGMENT_3D(a.geom, m.diminfo, 5, 10)
FROM routes r, user_sdo_geom_metadata m
WHERE m.table_name = 'ROUTES' AND m.column_name = 'GEOM'
AND r.route_id = 1;
However, the following format considers only the X and Y dimensions, and ignores the Z dimension, of the specified GEOM object in performing the clip operation:
SELECT SDO_LRS.CLIP_GEOM_SEGMENT(a.geom, m.diminfo, 5, 10)
FROM routes r, user_sdo_geom_metadata m
WHERE m.table_name = 'ROUTES' AND m.column_name = 'GEOM'
AND r.route_id = 1;
The parameters for the standard and 3D formats of any function are the same, and the Usage Notes apply to both formats.
The 3D formats are not supported with the following:
Geodetic data
Polygons, arcs, or circles