Bearing

Question

hi
The function SDO_UTIL.BEARING_TILT_FOR_POINTS takes start point and end point in geodetic coordinates. Is there any to use this function if coordinates are in projection system (UTM) ? I have used this function in geodetic system.
regards

Answer 1

You could of course transform the data into geodetic, calculate and tranfsorm back:
--calculate point 1000m 0° (north)
--  use WGS84 geodetic (8307) / ETRS89 UTM32 projected /25832)
SELECT SDO_CS.TRANSFORM(
         SDO_UTIL.POINT_AT_BEARING(
           SDO_CS.TRANSFORM(
            SDO_GEOMETRY(2001, 25832,SDO_POINT_TYPE(634176, 5618187, NULL), NULL, NULL),
            8307),
         0,1000),
       25832) 
  FROM DUAL; 
-- SDO_GEOMETRY(2001, 25832,SDO_POINT_TYPE(634150.34, 5619186.49, NULL), NULL, NULL), 
--check the distance in projected -> aproximate
SELECT SDO_GEOM.SDO_DISTANCE(
         SDO_GEOMETRY(2001, 25832,SDO_POINT_TYPE(634176.00, 5618187.00, NULL), NULL, NULL),
         SDO_GEOMETRY(2001, 25832,SDO_POINT_TYPE(634150.34, 5619186.49, NULL), NULL, NULL),
         0.1)
       FROM dual;
--999.82
--check the distance in geodetic -> exact
-- it is exactly northern
SELECT SDO_GEOM.SDO_DISTANCE(
         SDO_GEOMETRY(2001, 8307,SDO_POINT_TYPE(10.9000100360663, 50.7089939346931, NULL), NULL, NULL),
         SDO_GEOMETRY(2001, 8307,SDO_POINT_TYPE(10.9000100360663, 50.7000045737259, NULL), NULL, NULL),
         0.1)
       FROM dual;
--999.999995296258