SDO_LRS.GET_MEASURE

Format

SDO_LRS.GET_MEASURE(
     point        IN SDO_GEOMETRY 
     [, dim_array IN SDO_DIM_ARRAY] 
     ) RETURN NUMBER;

Description

Returns the measure of an LRS point.

Parameters

point: Point whose measure is to be returned.
dim_array: Dimensional information array corresponding to point, usually selected from one of the xxx_SDO_GEOM_METADATA views (described in Geometry Metadata Views).

Usage Notes

This function returns the measure of an LRS point.

If point is not valid, an "invalid LRS point" exception is raised.

Contrast this function with SDO_LRS.PROJECT_PT, which accepts as input a point that is not necessarily on the geometric segment, but which returns a point that is on the geometric segment, as opposed to a measure value. As the following example shows, the SDO_LRS.GET_MEASURE function can be used to return the measure of the projected point returned by SDO_LRS.PROJECT_PT.

The _3D format of this function (SDO_LRS.GET_MEASURE_3D) is available. For information about _3D formats of LRS functions, see 3D Formats of LRS Functions.

Examples

The following example returns the measure of a projected point. In this case, the point resulting from the projection is 9 units from the start of the segment.

SELECT SDO_LRS.GET_MEASURE(
   SDO_LRS.PROJECT_PT(a.route_geometry, m.diminfo,
    SDO_GEOMETRY(3001, NULL, NULL,
       SDO_ELEM_INFO_ARRAY(1, 1, 1),
       SDO_ORDINATE_ARRAY(9, 3, NULL)) ),
   m.diminfo )
   FROM lrs_routes a, user_sdo_geom_metadata m
   WHERE m.table_name = 'LRS_ROUTES' AND m.column_name = 'ROUTE_GEOMETRY'
       AND a.route_id = 1;

SDO_LRS.GET_MEASURE(SDO_LRS.PROJECT_PT(A.ROUTE_GEOMETRY,M.DIMINFO,SDO_GEOM
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