Generating links nodes

I have a large table of links (road network) and I'm trying to generate a new one for the matching nodes. In addition, I need to present existing links, the start_node and the end_node. I create new nodes by taking SDO_LRS. GEOM_SEGMENT_START_PT and SDO_LRS. GEOM_SEGMENT_END_PT of links.

However, at the crossroads (where 4 links meet) are a 4 generated distinct nodes, instead of a single, which would be shared between all 4 links. To solve it, I could use the function of the distance to each node a to find and remove other nodes with the same geometry, leaving only one, but it's too expensive.

Are there other ways to generate the nodes more quickly?

see you soon

Hello
Suppose you have a table node with node_id, geometry (sdo_geometry)
You can create a spatial index on node_geometry.

Create a table of node mapping: node_id, target_node_id.

Then, to find all nodes that are a given distance WRT a given node. (using operator sdo_within_cost)

select a.node_id node_id, min(b.node_id) target_node_id
from node_table a, node_table b
where sdo_within_distance (b.geometry,a.geometry,'distance = 0.001') = 'TRUE'
group by a.node_id;

For the Group of the intersection of 4 knots (1,2,3,4)
you get:

target_node_id node_id
1 1
6 5
1 of 3
4 1

To the node table, remove those whose node_id is greater than his target_node_id. This command removes the redundant nodes.

For the table of links: link_id, start_node_id, end_node_id...
You can update the start_node_id and end_node_id with their target_node_id in the node_mapping table.

It is more efficient that you use the spatial operator.

I hope that helps!

Jack

Tags: Database

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Nice day
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< identification >
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< / identification >
< identification >
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< / identification >
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-Function
CREATE FUNCTION IDENTIFICATIONDETAILS
.....
SELECT
XMLAGG
(
XMLELEMENT
(
"identification."
XMLFOREST
(
type 'TYPE '.
number such AS 'number '.
)
)
)
Of...
;/
-Query
SELECT
XMLFOREST
(
p.NAME AS 'name',
IDENTIFICATIONDETAILS (p.ID) AS 'identification'
)
Of
NO p
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< id > 1 < /ID >
cheeses from < name > < / name >
< owner >
< name > bert < / name >
< identification >
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< number > 12345 < / number >
travel document < type > < / type >
< number > 98765 < / number >
< / identification >
< / owner >
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What about

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