Creation of spatial data connectivity data

Hello

I have a few spatial data, which I'll try to describe the relevant aspects:

-A LineSegment table, which contains information about cables, including the ID of the area (approximately 4 million lines)
-An array of location, that contains a LineSegmentID (one by one), and a column (space) geometry (approximately 4 million lines).

What I need to do, is to create a new table containing conceptual "nodes", containing the following columns:

-NodeID (number)
-(Number) LineSegmentID
-LineSegmentEnd (1 or 2)

So I need to prepare, for each cable, which other cable it connects, by comparing its ends with the endpoints of other cables in the same sector. A box contains cables up to 464. There are a total of 160 thousand areas.

I'm working on the most effective way to achieve this, ideally by making a batch which will take less than half an hour. Oracle is relatively new to me, but I'm guessing that the right approach would be to use a series of intermediate (intermediate) tables, as I believe nested cursors would be much too slow (I ran a simple test to confirm this).

I guess I'll have to get in a temporary table, the starting point and the end point of each cable using SDO_LRS. GEOM_SEGMENT_START_PT and SDO_LRS. GEOM_SEGMENT_END_PT, as well as the area ID. Join the table to itself, and then use SDO_GEOM. SDO_DISTANCE to work on what points are close together (for example less than one meter). However, I'm fighting to describe a step by step process.

Anyone has any ideas that can help?

(Oracle 11g)

Examples of data to illustrate the problem:

create table line_location (lineid number,
geometry sdo_geometry);
create table (ID, areaid) line;

-a cable in the box 1, 2 in area 4, etc.
insert into a values (1, 1) line;
insert into values of line (2, 4);
insert into values of line (3, 4);
insert into a values (4, 3) line;
insert into values of line (5, 3);
insert into a values (6, 3) line;
insert into values of line (7, 2);
insert into values of line (8: 2);
insert into a values (9, 2) line;
insert into values of line (10, 2);

-in reality, the lines are not necessarily straight and simple as these...
insert into line_location values (1, MDSYS. SDO_GEOMETRY (2002,3785, NULL, MDSYS. SDO_ELEM_INFO_ARRAY (1,2,1), MDSYS. SDO_ORDINATE_ARRAY (10,1,10,4))); -zone 1
insert into line_location values (2, MDSYS. SDO_GEOMETRY (2002,3785, NULL, MDSYS. SDO_ELEM_INFO_ARRAY (1,2,1), MDSYS. SDO_ORDINATE_ARRAY (3,9,5,9))); -zone 4
insert into line_location values (3, MDSYS. SDO_GEOMETRY (2002,3785, NULL, MDSYS. SDO_ELEM_INFO_ARRAY (1,2,1), MDSYS. SDO_ORDINATE_ARRAY (5,9,5,10))); -zone 4
insert into line_location values (4, MDSYS. SDO_GEOMETRY (2002,3785, NULL, MDSYS. SDO_ELEM_INFO_ARRAY (1,2,1), MDSYS. SDO_ORDINATE_ARRAY (1,1,2,1))); -zone 3
insert into line_location values (5, MDSYS. SDO_GEOMETRY (2002,3785, NULL, MDSYS. SDO_ELEM_INFO_ARRAY (1,2,1), MDSYS. SDO_ORDINATE_ARRAY (2,3,2,1))); -zone 3
insert into line_location values (6, MDSYS. SDO_GEOMETRY (2002,3785, NULL, MDSYS. SDO_ELEM_INFO_ARRAY (1,2,1), MDSYS. SDO_ORDINATE_ARRAY (2,3,3,3))); -zone 3
insert into line_location values (7, MDSYS. SDO_GEOMETRY (2002,3785, NULL, MDSYS. SDO_ELEM_INFO_ARRAY (1,2,1), MDSYS. SDO_ORDINATE_ARRAY (5,3,5,4))); -zone 2
insert into line_location values (8, MDSYS. SDO_GEOMETRY (2002,3785, NULL, MDSYS. SDO_ELEM_INFO_ARRAY (1,2,1), MDSYS. SDO_ORDINATE_ARRAY (4,4,5,4))); -zone 2
insert into line_location values (9, MDSYS. SDO_GEOMETRY (2002,3785, NULL, MDSYS. SDO_ELEM_INFO_ARRAY (1,2,1), MDSYS. SDO_ORDINATE_ARRAY (5,9,6,4))); -zone 2
insert into line_location values (10, MDSYS. SDO_GEOMETRY (2002,3785, NULL, MDSYS. SDO_ELEM_INFO_ARRAY (1,2,1), MDSYS. SDO_ORDINATE_ARRAY (5,7,5,9))); -zone 2

create table node_line (node_id number,
line_id number,
endpoint_id number,--1 for starting point, 2 for the end point.
area_id number
);

-expected here. If two lines are less than 0.5, whereas they should share a node.
insert into node_line values (1, 1, 1, 1); -insulated cable in zone 1, starting point node
insert into node_line values (2, 1, 2, 1); -insulated cable in zone 1, point endpoint node
insert into node_line values (3, 2, 1, 4); -zone 4: 2, node starting point of cable
insert into node_line values (4, 2, 2, 4); -zone 4, cable 2, point endpoint node
insert into node_line values (4, 3, 1, 4); -point 2 = cable endpoint node cable 3 start knot, etc.
insert into node_line values (5, 3, 2, 4);
insert into node_line values (6, 4, 1, 3); -node at (1,1)
insert into node_line values (7, 4, 2, 3); -node to (2.1)
insert into node_line (8, 5, 1, 3) values; -node to (2,3)
insert into node_line values (7, 5, 2, 3); -node to (2.1)
insert into node_line (8, 6, 1, 3) values; -node to (2,3)
insert into node_line values (9, 6, 2, 3); -(3.3) node
insert into node_line values (10, 7, 1, 2); -node to (5.3)
insert into node_line values (11, 7, 2, 2); -node to (5.4)
insert into node_line (12, 7, 1, 2) values; -node to (4.4)
insert into node_line values (11, 7, 2, 2); -node to (5.4)
insert into node_line (13, 7, 1, 2) values; -node to (5.9)
insert into node_line (14, 7, 2, 2) values; -node (6.4)
insert into node_line values (15, 7, 1, 2); -node to (5,7)
insert into node_line (13, 7, 2, 2) values; -node to (5.9)

Thank you

Hi Ronnie

Have you had a look at the script on the old NET?
This done in a slightly different result structure, what you're after.
I took the time this morning to see a bit optimized.

Below you will find the result.

With clues about a couple and the use of the SDO_JOIN rather the sdo_relate this speeds up considerably.
I had tested on a 600 k line objects (which is not 4 million I know) and is reasonable ok on my test (non optimized) environment.

On the "1 metre" close to each other, I would have supported itself by setting the tolerance appropriately, so
There should be no reason to perform within the distance checking. Obviously that permitting the resolution of your data.

Have a look at.

Note that the final table is different in their structure, but this needs to be easily adjusted in the script if your node_line table must be exactly like you defined.

Luke

-drop the existing SEQ_TOPO

sequence of fall SEQ_TOPO;

-create sequences with caching

CREATE SEQ_TOPO CACHE 2000 SEQUENCES;

commit;

-drop temporary table

drop table temp_nodes cascade constraints;

-create temporary table and fill it with startponts and a field saying this are implemented, as X, Y, as we use it later to remove duplicates in a nonspatial way

create the table temp_nodes

as

Select a.lineid, a.areaid, sdo_geometry (2001, a.node.sdo_srid, SDO_POINT (t.X, t.Y, null), null, null) as a node, SEQ_TOPO.nextval node_id, the from ' AS STEND, t.x, t.y

Of

(select lineid, areaid, node sdo_lrs.geom_segment_start_pt (geometry) of line_location, where the LINE line_location.lineid = line.line_id), TABLE (SDO_UTIL. GETVERTICES (a.Node)) t;

commit;

-Insert the end points in the temporary table

insert into temp_nodes

Select a.lineid, a.areaid, sdo_geometry (2001, a.node.sdo_srid, SDO_POINT (t.X, t.Y, null), null, null) as a node, SEQ_TOPO.nextval node_id, 'E' AS STEND, t.x, t.y

Of

(select lineid, areaid, node sdo_lrs.geom_segment_end_pt (geometry) of line_location, where the LINE line_location.lineid = line.line_id), TABLE (SDO_UTIL. GETVERTICES (a.Node)) t;

commit;

-insert user_sdo_geom_metadata and have created for temp_nodes index

-adjust with appropriate metadata to srid, high and lowebounds values and the tolerance of your dataset

-Here the tolerance is set at 1 meter, this way there is no need to use a distance, let tolerance help us here

-Obviously this can work if tolerance is smaller, then the distance between the start and end of the link itself.

delete from user_sdo_geom_metadata where table_name = 'TEMP_NODES ';

INSERT INTO user_sdo_geom_metadata VALUES ("TEMP_NODES", "NODE", SDO_DIM_ARRAY (SDO_DIM_ELEMENT ('X', 0, 1000000, 1), SDO_DIM_ELEMENT ('Y', 0, 100000, 1)), 3785);

-create spatial indexes with gtype = POINT to use internal optimization

Drop index node_sx;

CREATE INDEX node_sx ON temp_nodes (node) INDEXTYPE IS MDSYS. SPATIAL_INDEX PARAMETERS ('sdo_indx_dims = 2, layer_gtype = POINT');

-create indexes on X, Y combination to accelerate "eliminating duplicates" (in the group by) is actually a "select unique" rather that remove duplicates

CREATE INDEX INDEX1 ON TEMP_NODES (X, Y);

CREATE the INDEX INDEX2 ON TEMP_NODES (node_id);

-create the final node table with unique nodes of the temporary table, x, to y could be omitted

create the table node_topo

as

Select a.nodeid, t.node, t.x, t.y

Of

(

Select min (node_id) as nodeid

Of

temp_nodes

Group x, Y

) an inner join

temp_nodes t

on (a.nodeid = t.node_id)

;

commit;

-insertion of metadata information

delete from user_sdo_geom_metadata where table_name = 'NODE_TOPO ';

INSERT INTO user_sdo_geom_metadata VALUES ("NODE_TOPO", "NODE", SDO_DIM_ARRAY (SDO_DIM_ELEMENT ('X', 0, 1000000, 1), SDO_DIM_ELEMENT ('Y', 0, 100000, 1)), 3785);

-create spatial indexes on the table to end node with gtype = POINT (internal optimization)

Drop index node_topo_sx;

CREATE INDEX node_topo_sx ON NODE_TOPO (node) INDEXTYPE IS MDSYS. SPATIAL_INDEX PARAMETERS ('sdo_indx_dims = 2, layer_gtype = POINT');

-create table node_link using SDO_JOIN between end node final tables and temp

-the NAYINTERACT should take care of the "alignment" as the tolerance will be applied

create the table node_line

as

Select lineid, max (st_ID) START_NODE_ID, max (en_ID) END_NODE_ID, max (areaid) AREAID

Of

(

SELECT b.lineid, case when b.stend = s ' THEN a.nodeid 0 otherwise end st_ID,.

cases where b.stend = 'E' THEN a.nodeid 0 otherwise end en_ID, areaid

TABLE (SDO_JOIN ('NODE_TOPO', 'NODE',

"TEMP_NODES", "NODE",

"(masque = ANYINTERACT')) c,"

node_topo has,

temp_nodes b

WHERE c.rowid1 = a.rowid AND c.rowid2 = b.rowid

)

Lineid group;

commit;

-items temp

drop table temp_nodes cascade constraints;

delete from user_sdo_geom_metadata where table_name = 'TEMP_NODES ';

commit;

seq_topo sequence of fall;

commit;

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    Oracle Database 11 g Release 11.2.0.2.0 - 64 bit Production
    PL/SQL Release 11.2.0.2.0 - Production
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SQL> with
  2      master_data as
  3      (
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  5      select 1 id, 'Header 1' description from dual union all
  6      select 2 id, 'Header 2' description from dual union all
  7      select 3 id, 'Header 3' description from dual union all
  8      select 4 id, 'Header 4' description from dual
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 14      select 1 id, 2 detail_id, 'Detail 1.2' description from dual union all
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 19      select 2 id, 4 detail_id, 'Detail 2.4' description from dual union all
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 28  from
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-------- ----------
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Header 1 Detail 1.2
Header 1 Detail 1.3
Header 2 Detail 2.1
Header 2 Detail 2.2
Header 2 Detail 2.3
Header 2 Detail 2.4
Header 4 Detail 4.2
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SQL> edi
Wrote file afiedt.buf

  1  with
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  3      (
  4      -- this query emulates the master data of a master detail query
  5      select 1 id, 'Header 1' description from dual union all
  6      select 2 id, 'Header 2' description from dual union all
  7      select 3 id, 'Header 3' description from dual union all
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 30      detail_data d
 31  where
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 33  order by
 34      m.id,
 35*     d.detail_id
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-------- ----------
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Header 1 Detail 1.2
Header 1 Detail 1.3
Header 2 Detail 2.1
Header 2 Detail 2.2
Header 2 Detail 2.3
Header 2 Detail 2.4
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Header 4 Detail 4.3

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