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Current Oracle Spatial Blog Articles

    GeoRaptor 4.x Update 2 (Project has Stalled)
    Tip: Drop that Spatial Index!
    Convert Single Geometry to Multi-part Geometry in Oracle Spatial
    Optimized Rectangle to 5 Point Polygon
    Centroid Package now supports Y ordinate seeding
    Convert GeoJSON document to Sdo_Geometry objects
    Implementation Of Travelling Salesman Problem
    Create Polygon From Bearings And Distances
    Function That Returns a Compass Point From a Whole Circle Bearing
    Playing around with Centroids by using different seed values
    Simple Oracle C Sprintf or Java String.format
    Some Oriented Point Functions
    Extracting Inner Rings Changed Ordinate Ordering: A Trap For Players Who Don't Read Documentation!
    PLS-00306: wrong number or types of arguments in call to 'SDO_GEOMETRY'
    Converting Google Earth Formatted Longitude/Latitude points to decimal degrees
    Oracle Business Intelligence Warehousing and Analytics - Spatial Summit
    How far inside, is inside? Measuring actual distance.
    Noding and building a polygon from single, overlapping linestrings
    Analyzing Spatial Query Performance Improvements in Oracle Spatial and Graph 12c Through Cross-Vendor Comparison
    ST_VertexN / ST_PointN - Extracting a specific point from any geometry
    Convert Single Point stored in SDO_ORDINATES to SDO_POINT_TYPE
    Aggregate APPEND Islands and XOR polygons
    Circular Arcs in Geodetic Polygons
    Some SDO_GEOMETRY/DIMINFO handling functions
    Applying And Extending Oracle Spatial - Book Released
    Changing all DIMINFO sdo_tolerance values for all metadata records in one go.
    Building Polygons from Incomplete Linestrings using ST_PolygonBuilder
    Computing Cardinal Directions to nearby geometries
    Intersecting two aggregated polygon layers with SC4O
    Spatial and Oracle 12c
    Update Triggers and SDO_GEOMETRY Equality
    Duplicate Geometry data and Data Models
    CENTROID package update
    How to calculate cumulative length of a linestring
    Useful Package of Wrapper Functions for Sdo_Util.AffineTransforms
    Compute Location from known Lat/Long point using delta easting and northing in miles
    SDO_AGGR_SET_UNION
    Sorting SDO_GEOMETRY data using the ORDER BY clause of a SELECT statement
    Creating linestrings from points
    Rounding Coordinates or Ordinates in SDO_GEOMETRY
    Effects of Sdo_Geometry Ordinate Precision on Performance
    Effects of Sdo_Geometry Ordinate Precision on Storage
    The Spatial filtering of geometries: The effect of tolerances on relationships
    Application of Delaunay Triangulation and Inverse Distance Weighting (IDW) in Oracle for Soils Interpolation
    Selecting all SDO_GTYPE values for all tables/sdo_geometry columns in a schema
    CENTROID package - Tips for Use
    Announcing the Spatial Companion For Oracle (SC4O)
    Filtering Rings (Oracle Spatial)
    Splitting a polygon using one or more linestrings
    isValid, isSimple, Dimension and CoordDim methods for SDO_Geometry
    Line Merging or Collecting lines together: ST_LineMerger
    ST_DeleteVertex for Oracle SDO_Geometry based on Jaspa/JTS
    3D/4D and SRID aware Conversion functions for SDO_Geometry: WKT and EWKT
    Topological vs Non-Topological Simplification/Generalization of Aggregated Area Geometies in Oracle
    Filtering very short linestrings via bitmap function index
    CENTROID For Oracle
    Gridding a sdo_geometry line/polygon object (Oracle)
    Finding centre and radius of a circular geometry
    Constraining geometry type for sdo_geometry column in a table.
    CASE Statements and SDO_GEOMETRY
    The Power of Constraints and Indexes for Spatial Constraints: stopping duplicate points
    Replacement for SDO_GEOM.RELATE - ST_Relate based on JTS
    Changing Oracle Spatial Index Parameters on existing index
    Writing Excel Spreadsheets files from within the Oracle database using Java and PL/SQL
    Writing xSV (eg csv) files from within the Oracle database using Java and PL/SQL
    A simple spike finder for Spatial/Locator
    JTS Java class compilation for 11g and above
    Random Spatial Search Procedure
    Geometry Snapping using JTS in Oracle
    Exposing JTS's MinimumBoundingCircle functionality
    Exposing JTS's Densifier functionality
    Using JTS's Comparison Functions - HausdorffSimilarityMeasure & AreaSimilarityMeasure with SDO_GEOMETRY
    Free JTS-based Area/Length Functions
    Handy way of systematically fixing polygon geometries with 13349 and other errors
    Standalone CENTROID package now available for download
    Free Union, Intersection, Xor and Difference Functions for Oracle Locator - Part 4 Processing Geodetic data
    Configurable Buffer: JTS and Oracle
    Free Union, Intersection, Xor and Difference Functions for Oracle Locator - Part 3
    Free Union, Intersection, Xor and Difference Functions for Oracle Locator - Part 2
    Free Union, Intersection, Xor and Difference Functions for Oracle Locator - Part 1
    Building Lines into Polygons in Oracle Locator / Spatial
    Finding Intersection Points between Line and Polygon
    SDO2GeoJSON
    Free version of sdo_length
    Alternative to my SQL based GetNumRings function
    External Tables and SDO_Geometry data.
    layer_gtype keyword issue when indexing linear data on 11g
    String Tokenizer for Oracle
    Free Aggregate Method for Concatenating 2D Lines in Oracle Locator 10g
    Reducing 5 Vertex Polygon to Optimized Rectangle
    Square Buffer
    Converting decimal seconds to string
    SDO_GEOM.VALIDATE_GEOMETRY_WITH_CONTEXT - 13356 Issues
    Valid conversion unit values for Oracle sdo_geom.sdo_length()
    Removing Steps in Gridded Vector Data - SmoothGrid for Oracle
    Oracle Spatial DISJOINT search/filtering
    Creating SDO_Geometry from geometric data recorded in the columns of a table
    Concave Hull Geometries in Oracle 11gR2
    Projecting SDO_GEOM_METADATA DIMINFO XY ordinates
    Instantiating MDSYS.VERTEX_TYPE
    New PL/SQL Packages - Rotate oriented point
    GeoRaptor Development Team
    Fast Refreshing Materialized View Containing SDO_GEOMETRY and SDO_GEOM.SDO_AREA function
    Performance of PL/SQL Functions using SQL vs Pure Code
    Implementing the BEST VicGrid Projection in Oracle 10gR2
    Making Sdo Geometry Metadata Update Generic Code
    ORA-13011 errors when using SDO_GEOM.VALIDATE_LAYER_WITH_CONTEXT()
    Extract Polygons from Compound Polygon
    Detecting sdo_geometries with compound (3-point Arcs) segments
    GEOMETRY_COLUMNS for Oracle Spatial
    Convert GML to SDO_Geometry in Oracle 10gR2
    Spatial Sorting of Data via Morton Key
    Swapping Ordinates in an SDO_GEOMETRY object
    New To_3D Function
    Extend (Reduce/Contract/Skrink) Function for Oracle
    Loading and Processing GPX 1.1 files using Oracle XMLDB
    Loading Spatial Data from an external CSV file in Oracle
    Calling the Oracle Spatial shapefile loader from within the Oracle database itself
    Implementing SDO_VertexUpdate/ST_VertexUpdate for Oracle
    Implementing SDO_RemovePoint/ST_RemovePoint for Oracle
    Implementing SDO_AddPoint/ST_AddPoint for Oracle
    ESRI ArcSDE Exverted and Inverted Polygons and Oracle Spatial
    Funky Fix Ordinates By Formula
    Implementing a SetPoint/ST_SetPoint function in Oracle
    Implementing an ST_SnapToGrid (PostGIS) function for Oracle Spatial
    Generating random point data
    Implementing an Affine/ST_Affine function for Oracle Spatial
    Implementing a Scale/ST_Scale function for Oracle Spatial
    Implementing a Parallel/ST_Parallel function for linestring data for Oracle Spatial
    Implementing a Rotate/ST_Rotate function for Oracle Spatial
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    Implementing a Translate/ST_Translate/Move function for Oracle Spatial
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    Minumum Bounding Rectangle (MBR) Object Type for Oracle
    How to extract elements from the result of an sdo_intersection of two polygons.
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    Fixing failed spatial indexes after import using data pump
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    Multi-Centroid Shootout
    Oracle Spatial Centroid Shootout
    On the use of ROLLUP in Oracle SELECT statements
    Surrounding Parcels
    Spatial Pipelining
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    Converting distances and units of measure in Oracle Locator
    Split Sdo_Geometry Linestring at a known point
    Forcing an Sdo_Geometry object to contain only points, lines or areas
    Unpacking USER_SDO_GEOM_METADATA's DIMINFO structure using SQL
    Generating multi-points from single point records in Oracle Spatial
    Object Tables of Sdo_Geometry
    Oracle Locator vs Oracle Spatial: A Reflection on Oracle Licensing of the SDO_GEOM Package
    FAST REFRESHing of Oracle Materialized Views containing Sdo_Geometry columns
    Australian MGA/AMG Zone Calculation from geographic (longitude/latitude) data
    Loading Shapefiles (SHP) into Oracle Spatial
    Oracle Spatial Mapping and Map Rendering Performance Tips
    The significance of sdo_lb/sdo_ub in USER_SDO_GEOM_METDATA: Do I need it?
    Oracle Spatial Forum - Melbourne April 2007
    Layer_GTypes for spatial indexes
    Oracle's SQL/MM Compliant Types
    Tips and Tricks

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All Blog Articles, Data Models and Free Source Code by Simon Greener, The SpatialDB Advisor is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.

Free version of sdo_length

Thursday July 21 2011 at 03:38

For users of 10gR2 Locator not licensed for Spatial, the use of sdo_geom.sdo_length is forbidden. So is use of sdo_geom.sdo_length. However, use of sdo_geom.sdo_distance is allowed for Locator users.

The sdo_geom.sdo_distance function can be used to construct an sdo_length alternative function that is fully licensed.

Here is one such attempt:

create or replace
Function sdo_length(p_geometry  in mdsys.sdo_geometry,
                    p_tolerance in number default 0.005 )
  Return Number
Is
  v_length       number;
  v_i            pls_integer;
  v_num_rings    pls_integer;
  v_num_elements pls_integer;
  v_element_no   pls_integer;
  v_element      mdsys.sdo_geometry;
  v_ring         mdsys.sdo_geometry;
  v_geometry     mdsys.sdo_geometry := p_geometry;
 
  Function ComputeLength (p_geometry  in mdsys.sdo_geometry,
                          p_tolerance in number default 0.005 )
    Return Number
  Is
    v_length   number := 0.0;
    v_vertex   mdsys.vertex_type;
    v_vertices mdsys.vertex_set_type;
  Begin 
    v_vertices := mdsys.sdo_util.getVertices(p_geometry);
    if ( v_vertices is null ) Then
       v_length := 0.0;
    Else
       v_vertex := v_vertices(1);
       for v_i in 2..v_vertices.COUNT loop
           v_length := v_length + 
                       mdsys.sdo_geom.sdo_distance(
                              mdsys.sdo_geometry(2001,p_geometry.sdo_srid,mdsys.sdo_point_type(       v_vertex.x,       v_vertex.y,null),null,null),
                              mdsys.sdo_geometry(2001,p_geometry.sdo_srid,mdsys.sdo_point_type(v_vertices(v_i).x,v_vertices(v_i).y,null),null,null),
                              p_tolerance);
           v_vertex := v_vertices(v_i);
       end loop;
    End If;
    return v_length;
  End ComputeLength;
 
  Function hasRectangles( p_elem_info in mdsys.sdo_elem_info_array  )
    Return Pls_Integer
  Is
     v_rectangle_count number := 0;
     v_etype           pls_integer;
     v_interpretation  pls_integer;
     v_elements        pls_integer;
  Begin
     If ( p_elem_info is null ) Then
        return 0;
     End If;
     v_elements := ( ( p_elem_info.COUNT / 3 ) - 1 );
     <<element_extraction>>
     for v_i IN 0 .. v_elements LOOP
       v_etype := p_elem_info(v_i * 3 + 2);
       v_interpretation := p_elem_info(v_i * 3 + 3);
       If  ( v_etype in (1003,2003) AND v_interpretation = 3  ) Then
           v_rectangle_count := v_rectangle_count + 1;
       end If;
     end loop element_extraction;
     Return v_rectangle_Count;
  End hasRectangles;
 
  Function hasCircularArcs(p_elem_info in mdsys.sdo_elem_info_array)
     return boolean 
   Is
     v_elements  number;
   Begin
     v_elements := ( ( p_elem_info.COUNT / 3 ) - 1 );
     <<element_extraction>>
     for v_i IN 0 .. v_elements LOOP
        if ( ( /* etype */         p_elem_info(v_i * 3 + 2) = 2 AND
               /* interpretation*/ p_elem_info(v_i * 3 + 3) = 2 )
             OR
             ( /* etype */         p_elem_info(v_i * 3 + 2) in (1003,2003) AND
               /* interpretation*/ p_elem_info(v_i * 3 + 3) IN (2,4) ) ) then
               return true;
        end If;
     end loop element_extraction;
     return false;
  End hasCircularArcs;
 
  Function GetNumRings( p_geometry  in mdsys.sdo_geometry,
                        p_ring_type in integer default 0 /* 0 = ALL; 1 = OUTER; 2 = INNER */ )
    Return Number
  Is
     v_ring_count number := 0;
     v_ring_type  number := p_ring_type;
     v_elements   number;
     v_etype      pls_integer;
  Begin
     If ( p_geometry is null ) Then
        return 0;
     End If;
     If ( p_geometry.sdo_elem_info is null ) Then
        return 0;
     End If;
     If ( v_ring_type not in (0,1,2) ) Then
        v_ring_type := 0;
     End If;
     v_elements := ( ( p_geometry.sdo_elem_info.COUNT / 3 ) - 1 );
     <<element_extraction>>
     for v_i IN 0 .. v_elements LOOP
       v_etype := p_geometry.sdo_elem_info(v_i * 3 + 2);
       If  ( v_etype in (1003,1005,2003,2005) and 0 = v_ring_type )
        OR ( v_etype in (1003,1005)           and 1 = v_ring_type )
        OR ( v_etype in (2003,2005)           and 2 = v_ring_type ) Then
           v_ring_count := v_ring_count + 1;
       end If;
     end loop element_extraction;
     Return v_ring_count;
  End GetNumRings;
 
  PROCEDURE ADD_Coordinate( p_ordinates  in out nocopy mdsys.sdo_ordinate_array,
                            p_dim        in number,
                            p_x_coord    in number,
                            p_y_coord    in number,
                            p_z_coord    in number,
                            p_m_coord    in number,
                            p_measured   in boolean := false,
                            p_duplicates in boolean := false)
    IS
      Function Duplicate
        Return Boolean
      Is
      Begin
        Return case when p_ordinates is null or p_ordinates.count = 0
                    then False
                    Else case p_dim
                              when 2
                              then ( p_ordinates(p_ordinates.COUNT)   = p_y_coord
                                     AND
                                     p_ordinates(p_ordinates.COUNT-1) = p_x_coord )
                              when 3
                              then ( p_ordinates(p_ordinates.COUNT)   =  case when p_measured then p_m_coord else p_z_coord end
                                     AND
                                     p_ordinates(p_ordinates.COUNT-1) = p_y_coord
                                     AND
                                     p_ordinates(p_ordinates.COUNT-2) = p_x_coord )
                              when 4
                              then ( p_ordinates(p_ordinates.COUNT)   = p_m_coord
                                     AND
                                     p_ordinates(p_ordinates.COUNT-1) = p_z_coord
                                     AND
                                     p_ordinates(p_ordinates.COUNT-2) = p_y_coord
                                     AND
                                     p_ordinates(p_ordinates.COUNT-3) = p_x_coord )
                          end
                  End;
      End Duplicate;
 
  Begin
    If ( p_ordinates is null ) Then
       p_ordinates := new mdsys.sdo_ordinate_array(null);
       p_ordinates.DELETE;
    End If;
    If ( p_duplicates or Not Duplicate() ) Then
      IF ( p_dim >= 2 ) Then
        p_ordinates.extend(2);
        p_ordinates(p_ordinates.count-1) := p_x_coord;
        p_ordinates(p_ordinates.count  ) := p_y_coord;
      END IF;
      IF ( p_dim >= 3 ) Then
        p_ordinates.extend(1);
        p_ordinates(p_ordinates.count)   := case when p_dim = 3 And p_measured
                                                 then p_m_coord
                                                 else p_z_coord
                                            end;
      END IF;
      IF ( p_dim = 4 ) Then
        p_ordinates.extend(1);
        p_ordinates(p_ordinates.count)   := p_m_coord;
      END IF;
    End If;
  END ADD_Coordinate;
 
  Function Rectangle2Polygon(p_geometry in mdsys.sdo_geometry)
    return mdsys.sdo_geometry 
  As
    v_dims      pls_integer;
    v_ordinates mdsys.sdo_ordinate_array := new mdsys.sdo_ordinate_array(null);
    v_vertices  mdsys.vertex_set_type;
    v_etype     pls_integer;
    v_start_coord mdsys.vertex_type;
    v_end_coord   mdsys.vertex_type;
  Begin
      v_ordinates.DELETE;
      v_dims        := p_geometry.get_dims();
      v_etype       := p_geometry.sdo_elem_info(2);
      v_vertices    := sdo_util.getVertices(p_geometry);
      v_start_coord := v_vertices(1);
      v_end_coord   := v_vertices(2);
      -- First coordinate
      ADD_Coordinate( v_ordinates, v_dims, v_start_coord.x, v_start_coord.y, v_start_coord.z, v_start_coord.w );
      -- Second coordinate
      If ( v_etype = 1003 ) Then
        ADD_Coordinate(v_ordinates,v_dims,v_end_coord.x,v_start_coord.y,(v_start_coord.z + v_end_coord.z) /2, v_start_coord.w);
      Else
        ADD_Coordinate(v_ordinates,v_dims,v_start_coord.x,v_end_coord.y,(v_start_coord.z + v_end_coord.z) /2,
            (v_end_coord.w - v_start_coord.w) * ((v_end_coord.x - v_start_coord.x) /
           ((v_end_coord.x - v_start_coord.x) + (v_end_coord.y - v_start_coord.y)) ));
      End If;
      -- 3rd or middle coordinate
      ADD_Coordinate(v_ordinates,v_dims,v_end_coord.x,v_end_coord.y,v_end_coord.z,v_end_coord.w);
      -- 4th coordinate
      If ( v_etype = 1003 ) Then
        ADD_Coordinate(v_ordinates,v_dims,v_start_coord.x,v_end_coord.y,(v_start_coord.z + v_end_coord.z) /2,v_start_coord.w);
      Else
        Add_Coordinate(v_ordinates,v_dims,v_end_coord.x,v_start_coord.y,(v_start_coord.z + v_end_coord.z) /2,
            (v_end_coord.w - v_start_coord.w) * ((v_end_coord.x - v_start_coord.x) /
           ((v_end_coord.x - v_start_coord.x) + (v_end_coord.y - v_start_coord.y)) ));
      End If;
      -- Last coordinate
      ADD_Coordinate(v_ordinates,v_dims,v_start_coord.x,v_start_coord.y,v_start_coord.z,v_start_coord.w);
      return mdsys.sdo_geometry(p_geometry.sdo_gtype,p_geometry.sdo_srid,null,mdsys.sdo_elem_info_array(1,v_etype,1),v_ordinates);
  End Rectangle2Polygon;
 
Begin
  -- If the input geometry is null, just return null
  IF ( p_geometry IS NULL ) THEN
    RETURN NULL;
  END IF;
 
  -- Only process linestrings and polygons
  --
  If ( p_geometry.get_gtype() not in (2,6,3,7) ) Then
    RETURN NULL;
  End If;
 
  If ( hasCircularArcs(p_geometry.sdo_elem_info) ) then
      return null;
  End If;
 
  v_num_elements := mdsys.sdo_util.GetNumElem(p_geometry);
  v_length := 0.0;
  <<for_all_elements>>
  FOR v_element_no IN 1..v_num_elements LOOP
     v_element := mdsys.sdo_util.Extract(p_geometry,v_element_no);   -- Extract element with all sub-elements
     If ( v_element.get_gtype() = 2 ) Then
        v_length := v_length + ComputeLength(v_element,p_tolerance);
     Else
        v_num_rings := GetNumRings(v_element); 
        <<for_all_rings>>
        FOR v_i in 1..v_num_rings Loop
             v_ring := MDSYS.SDO_UTIL.EXTRACT(p_geometry,v_element_no,v_i);  -- Extract ring from element .. must do it this way, can't correctly extract from v_element.
            If (hasRectangles(v_ring.sdo_elem_info)>0 ) Then
               v_length := v_length + ComputeLength(Rectangle2Polygon(v_ring),p_tolerance);
            else
               v_length := v_length + ComputeLength(v_ring,p_tolerance);
            End If;
        End Loop for_all_rings;
     End If;
  END LOOP for_all_elements;
  return v_length;
  exception 
     when others then
        return null;
End sdo_length;

A quick and simple test.

select a.stype,
       sdo_length(a.geometry,0.005) as my_length,
       mdsys.sdo_geom.sdo_length(a.geometry,0.005) as ora_length
 from (select 'line' as stype, MDSYS.SDO_GEOMETRY(2006, NULL, NULL, MDSYS.SDO_ELEM_INFO_ARRAY(1,2,1,9,2,1), MDSYS.SDO_ORDINATE_ARRAY(50.0, 55.0, 50.0, 60.0, 55.0, 58.0, 50.0, 55.0, 56.0, 58.0, 60.0, 55.0, 60.0, 60.0, 56.0, 58.0)) as geometry from dual
       union all 
       select 'poly 2 rectangles' as stype, MDSYS.SDO_GEOMETRY(2003, NULL, NULL, MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,3,5,2003,3), MDSYS.SDO_ORDINATE_ARRAY(10.0, 135.0, 20.0, 140.0, 30.0, 100.0, 70.0, 100.0)) as geometry from dual
       union all
       select 'poly 1 rectangle' as stype, MDSYS.SDO_GEOMETRY(2003, NULL, NULL, MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,3), MDSYS.SDO_ORDINATE_ARRAY(10.0, 135.0, 20.0, 140.0)) as geometry from dual) a
 where a.geometry is not null 
   and a.geometry.sdo_gtype is not null
order by 1;
 
STYPE             MY_LENGTH         ORA_LENGTH
----------------- ----------------- ----------------
line              30.68825265697938 30.6882526569794
poly 1 rectangle  30                30
poly 2 rectangles 110               110

For those not wanting to create or use such a thing, the best thing to do is upgrade to 11g where sdo_length and sdo_area are now licensed (Oracle does not “do” back licensing).

Hope this helps those still on 10g.

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