pgr_analyzeGraph¶
pgr_analyzeGraph
— Analyzes the network topology.
Availability
Version 2.0.0
Official function
Description¶
The function returns:
OK
after the analysis has finished.FAIL
when the analysis was not completed due to an error.
[the_geom, id, source, target, rows_where]
VARCHAR
Prerequisites
The edge table to be analyzed must contain a source column and a target column filled with id’s of the vertices of the segments and the corresponding vertices table <edge_table>_vertices_pgr that stores the vertices information.
Use pgr_createVerticesTable to create the vertices table.
Use pgr_createTopology to create the topology and the vertices table.
Parameters¶
The analyze graph function accepts the following parameters:
- edge_table:
text
Network table name. (may contain the schema name as well)- tolerance:
float8
Snapping tolerance of disconnected edges. (in projection unit)- the_geom:
text
Geometry column name of the network table. Default value isthe_geom
.- id:
text
Primary key column name of the network table. Default value isid
.- source:
text
Source column name of the network table. Default value issource
.- target:
text
Target column name of the network table. Default value istarget
.- rows_where:
text
Condition to select a subset or rows. Default value istrue
to indicate all rows.
The function returns:
OK
after the analysis has finished.Uses the vertices table: <edge_table>_vertices_pgr.
Fills completely the
cnt
andchk
columns of the vertices table.Returns the analysis of the section of the network defined by
rows_where
FAIL
when the analysis was not completed due to an error.The vertices table is not found.
A required column of the Network table is not found or is not of the appropriate type.
The condition is not well formed.
The names of source , target or id are the same.
The SRID of the geometry could not be determined.
The Vertices Table
The vertices table can be created with pgr_createVerticesTable or pgr_createTopology
The structure of the vertices table is:
- id:
bigint
Identifier of the vertex.- cnt:
integer
Number of vertices in the edge_table that reference this vertex.- chk:
integer
Indicator that the vertex might have a problem.- ein:
integer
Number of vertices in the edge_table that reference this vertex as incoming. See pgr_analyzeOneWay.- eout:
integer
Number of vertices in the edge_table that reference this vertex as outgoing. See pgr_analyzeOneWay.- the_geom:
geometry
Point geometry of the vertex.
Usage when the edge table’s columns MATCH the default values:¶
The simplest way to use pgr_analyzeGraph is:
SELECT pgr_createTopology('edges',0.001, 'geom', clean := true);
NOTICE: PROCESSING:
NOTICE: pgr_createTopology('edges', 0.001, 'geom', 'id', 'source', 'target', rows_where := 'true', clean := t)
NOTICE: Performing checks, please wait .....
NOTICE: Creating Topology, Please wait...
NOTICE: -------------> TOPOLOGY CREATED FOR 18 edges
NOTICE: Rows with NULL geometry or NULL id: 0
NOTICE: Vertices table for table public.edges is: public.edges_vertices_pgr
NOTICE: ----------------------------------------------
pgr_createtopology
--------------------
OK
(1 row)
SELECT pgr_analyzeGraph('edges',0.001,'geom');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('edges',0.001,'geom','id','source','target','true')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 2
NOTICE: Dead ends: 7
NOTICE: Potential gaps found near dead ends: 1
NOTICE: Intersections detected: 1
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
Arguments are given in the order described in the parameters:
SELECT pgr_analyzeGraph('edges',0.001,'geom','id','source','target');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('edges',0.001,'geom','id','source','target','true')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 2
NOTICE: Dead ends: 7
NOTICE: Potential gaps found near dead ends: 1
NOTICE: Intersections detected: 1
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
We get the same result as the simplest way to use the function.
Warning
An error would occur when
the arguments are not given in the appropriate order:
In this example, the column id
of the table mytable
is passed to the function as the geometry column, and the geometry column
the_geom
is passed to the function as the id column.
SELECT pgr_analyzeGraph('edges',0.001,'id','geom','source','target');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('edges',0.001,'id','geom','source','target','true')
NOTICE: Performing checks, please wait ...
NOTICE: Got function st_srid(bigint) does not exist
NOTICE: ERROR: something went wrong when checking for SRID of id in table public.edges
pgr_analyzegraph
------------------
FAIL
(1 row)
When using the named notation
The order of the parameters do not matter:
SELECT pgr_analyzeGraph('edges',0.001,the_geom:='geom',id:='id',source:='source',target:='target');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('edges',0.001,'geom','id','source','target','true')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 2
NOTICE: Dead ends: 7
NOTICE: Potential gaps found near dead ends: 1
NOTICE: Intersections detected: 1
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
SELECT pgr_analyzeGraph('edges',0.001,source:='source',id:='id',target:='target',the_geom:='geom');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('edges',0.001,'geom','id','source','target','true')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 2
NOTICE: Dead ends: 7
NOTICE: Potential gaps found near dead ends: 1
NOTICE: Intersections detected: 1
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
Parameters defined with a default value can be omitted, as long as the value matches the default:
SELECT pgr_analyzeGraph('edges',0.001, 'geom', source:='source');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('edges',0.001,'geom','id','source','target','true')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 2
NOTICE: Dead ends: 7
NOTICE: Potential gaps found near dead ends: 1
NOTICE: Intersections detected: 1
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
Selecting rows using rows_where parameter
Selecting rows based on the id. Displays the analysis a the section of the network.
SELECT pgr_analyzeGraph('edges',0.001, 'geom', rows_where:='id < 10');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('edges',0.001,'geom','id','source','target','id < 10')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 0
NOTICE: Dead ends: 4
NOTICE: Potential gaps found near dead ends: 0
NOTICE: Intersections detected: 0
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
Selecting the rows where the geometry is near the geometry of row with id
=
5
SELECT pgr_analyzeGraph('edges',0.001, 'geom', rows_where:='geom && (SELECT st_buffer(geom,0.05) FROM edge_table WHERE id=5)');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('edges',0.001,'geom','id','source','target','geom && (SELECT st_buffer(geom,0.05) FROM edge_table WHERE id=5)')
NOTICE: Performing checks, please wait ...
NOTICE: Got relation "edge_table" does not exist
NOTICE: ERROR: Condition is not correct. Please execute the following query to test your condition
NOTICE: select count(*) from public.edges WHERE true AND (geom && (SELECT st_buffer(geom,0.05) FROM edge_table WHERE id=5))
pgr_analyzegraph
------------------
FAIL
(1 row)
Selecting the rows where the geometry is near the geometry of the row with
gid
=100 of the table othertable
.
CREATE TABLE otherTable AS (SELECT 100 AS gid, st_point(2.5,2.5) AS other_geom) ;
SELECT 1
SELECT pgr_analyzeGraph('edges',0.001, 'geom', rows_where:='geom && (SELECT st_buffer(geom,1) FROM otherTable WHERE gid=100)');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('edges',0.001,'geom','id','source','target','geom && (SELECT st_buffer(geom,1) FROM otherTable WHERE gid=100)')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 2
NOTICE: Dead ends: 7
NOTICE: Potential gaps found near dead ends: 1
NOTICE: Intersections detected: 1
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
Usage when the edge table’s columns DO NOT MATCH the default values:¶
For the following table
CREATE TABLE mytable AS (SELECT id AS gid, source AS src ,target AS tgt , geom AS mygeom FROM edges);
SELECT 18
SELECT pgr_createTopology('mytable',0.001,'mygeom','gid','src','tgt', clean := true);
NOTICE: PROCESSING:
NOTICE: pgr_createTopology('mytable', 0.001, 'mygeom', 'gid', 'src', 'tgt', rows_where := 'true', clean := t)
NOTICE: Performing checks, please wait .....
NOTICE: Creating Topology, Please wait...
NOTICE: -------------> TOPOLOGY CREATED FOR 18 edges
NOTICE: Rows with NULL geometry or NULL id: 0
NOTICE: Vertices table for table public.mytable is: public.mytable_vertices_pgr
NOTICE: ----------------------------------------------
pgr_createtopology
--------------------
OK
(1 row)
Using positional notation:
The arguments need to be given in the order described in the parameters:
SELECT pgr_analyzeGraph('mytable',0.001,'mygeom','gid','src','tgt');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('mytable',0.001,'mygeom','gid','src','tgt','true')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 2
NOTICE: Dead ends: 7
NOTICE: Potential gaps found near dead ends: 1
NOTICE: Intersections detected: 1
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
Warning
An error would occur when
the arguments are not given in the appropriate order: In this example, the
column gid
of the table mytable
is passed to the function as the
geometry column, and the geometry column mygeom
is passed to the function
as the id column.
SELECT pgr_analyzeGraph('mytable',0.0001,'gid','mygeom','src','tgt');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('mytable',0.0001,'gid','mygeom','src','tgt','true')
NOTICE: Performing checks, please wait ...
NOTICE: Got function st_srid(bigint) does not exist
NOTICE: ERROR: something went wrong when checking for SRID of gid in table public.mytable
pgr_analyzegraph
------------------
FAIL
(1 row)
When using the named notation
The order of the parameters do not matter:
SELECT pgr_analyzeGraph('mytable',0.001,the_geom:='mygeom',id:='gid',source:='src',target:='tgt');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('mytable',0.001,'mygeom','gid','src','tgt','true')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 2
NOTICE: Dead ends: 7
NOTICE: Potential gaps found near dead ends: 1
NOTICE: Intersections detected: 1
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
SELECT pgr_analyzeGraph('mytable',0.001,source:='src',id:='gid',target:='tgt',the_geom:='mygeom');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('mytable',0.001,'mygeom','gid','src','tgt','true')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 2
NOTICE: Dead ends: 7
NOTICE: Potential gaps found near dead ends: 1
NOTICE: Intersections detected: 1
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
In this scenario omitting a parameter would create an error because the default values for the column names do not match the column names of the table.
Selecting rows using rows_where parameter
Selecting rows based on the id.
SELECT pgr_analyzeGraph('mytable',0.001,'mygeom','gid','src','tgt',rows_where:='gid < 10');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('mytable',0.001,'mygeom','gid','src','tgt','gid < 10')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 0
NOTICE: Dead ends: 4
NOTICE: Potential gaps found near dead ends: 0
NOTICE: Intersections detected: 0
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
SELECT pgr_analyzeGraph('mytable',0.001,source:='src',id:='gid',target:='tgt',the_geom:='mygeom',rows_where:='gid < 10');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('mytable',0.001,'mygeom','gid','src','tgt','gid < 10')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 0
NOTICE: Dead ends: 4
NOTICE: Potential gaps found near dead ends: 0
NOTICE: Intersections detected: 0
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
Selecting the rows WHERE the geometry is near the geometry of row with id
=5 .
SELECT pgr_analyzeGraph('mytable',0.001,'mygeom','gid','src','tgt',
rows_where:='mygeom && (SELECT st_buffer(mygeom,1) FROM mytable WHERE gid=5)');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('mytable',0.001,'mygeom','gid','src','tgt','mygeom && (SELECT st_buffer(mygeom,1) FROM mytable WHERE gid=5)')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 1
NOTICE: Dead ends: 5
NOTICE: Potential gaps found near dead ends: 0
NOTICE: Intersections detected: 1
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
SELECT pgr_analyzeGraph('mytable',0.001,source:='src',id:='gid',target:='tgt',the_geom:='mygeom',
rows_where:='mygeom && (SELECT st_buffer(mygeom,1) FROM mytable WHERE gid=5)');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('mytable',0.001,'mygeom','gid','src','tgt','mygeom && (SELECT st_buffer(mygeom,1) FROM mytable WHERE gid=5)')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 1
NOTICE: Dead ends: 5
NOTICE: Potential gaps found near dead ends: 0
NOTICE: Intersections detected: 1
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
Selecting the rows WHERE the geometry is near the place=’myhouse’ of the table
othertable
. (note the use of quote_literal)
DROP TABLE IF EXISTS otherTable;
DROP TABLE
CREATE TABLE otherTable AS (SELECT 'myhouse'::text AS place, st_point(2.5,2.5) AS other_geom) ;
SELECT 1
SELECT pgr_analyzeGraph('mytable',0.001,'mygeom','gid','src','tgt',
rows_where:='mygeom && (SELECT st_buffer(other_geom,1) FROM otherTable WHERE place='||quote_literal('myhouse')||')');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('mytable',0.001,'mygeom','gid','src','tgt','mygeom && (SELECT st_buffer(other_geom,1) FROM otherTable WHERE place='myhouse')')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 2
NOTICE: Dead ends: 10
NOTICE: Potential gaps found near dead ends: 1
NOTICE: Intersections detected: 1
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
SELECT pgr_analyzeGraph('mytable',0.001,source:='src',id:='gid',target:='tgt',the_geom:='mygeom',
rows_where:='mygeom && (SELECT st_buffer(other_geom,1) FROM otherTable WHERE place='||quote_literal('myhouse')||')');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('mytable',0.001,'mygeom','gid','src','tgt','mygeom && (SELECT st_buffer(other_geom,1) FROM otherTable WHERE place='myhouse')')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 2
NOTICE: Dead ends: 10
NOTICE: Potential gaps found near dead ends: 1
NOTICE: Intersections detected: 1
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
Additional Examples¶
SELECT pgr_createTopology('edges',0.001, 'geom', clean := true);
NOTICE: PROCESSING:
NOTICE: pgr_createTopology('edges', 0.001, 'geom', 'id', 'source', 'target', rows_where := 'true', clean := t)
NOTICE: Performing checks, please wait .....
NOTICE: Creating Topology, Please wait...
NOTICE: -------------> TOPOLOGY CREATED FOR 18 edges
NOTICE: Rows with NULL geometry or NULL id: 0
NOTICE: Vertices table for table public.edges is: public.edges_vertices_pgr
NOTICE: ----------------------------------------------
pgr_createtopology
--------------------
OK
(1 row)
SELECT pgr_analyzeGraph('edges', 0.001, 'geom');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('edges',0.001,'geom','id','source','target','true')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 2
NOTICE: Dead ends: 7
NOTICE: Potential gaps found near dead ends: 1
NOTICE: Intersections detected: 1
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
SELECT pgr_analyzeGraph('edges',0.001,'geom', rows_where:='id < 10');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('edges',0.001,'geom','id','source','target','id < 10')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 0
NOTICE: Dead ends: 4
NOTICE: Potential gaps found near dead ends: 0
NOTICE: Intersections detected: 0
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
SELECT pgr_analyzeGraph('edges',0.001,'geom', rows_where:='id >= 10');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('edges',0.001,'geom','id','source','target','id >= 10')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 2
NOTICE: Dead ends: 8
NOTICE: Potential gaps found near dead ends: 1
NOTICE: Intersections detected: 1
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
SELECT pgr_analyzeGraph('edges',0.001,'geom', rows_where:='id < 17');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('edges',0.001,'geom','id','source','target','id < 17')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 0
NOTICE: Dead ends: 3
NOTICE: Potential gaps found near dead ends: 0
NOTICE: Intersections detected: 0
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
SELECT pgr_createTopology('edges', 0.001,'geom', rows_where:='id <17', clean := true);
NOTICE: PROCESSING:
NOTICE: pgr_createTopology('edges', 0.001, 'geom', 'id', 'source', 'target', rows_where := 'id <17', clean := t)
NOTICE: Performing checks, please wait .....
NOTICE: Creating Topology, Please wait...
NOTICE: -------------> TOPOLOGY CREATED FOR 16 edges
NOTICE: Rows with NULL geometry or NULL id: 0
NOTICE: Vertices table for table public.edges is: public.edges_vertices_pgr
NOTICE: ----------------------------------------------
pgr_createtopology
--------------------
OK
(1 row)
SELECT pgr_analyzeGraph('edges', 0.001, 'geom');
NOTICE: PROCESSING:
NOTICE: pgr_analyzeGraph('edges',0.001,'geom','id','source','target','true')
NOTICE: Performing checks, please wait ...
NOTICE: Analyzing for dead ends. Please wait...
NOTICE: Analyzing for gaps. Please wait...
NOTICE: Analyzing for isolated edges. Please wait...
NOTICE: Analyzing for ring geometries. Please wait...
NOTICE: Analyzing for intersections. Please wait...
NOTICE: ANALYSIS RESULTS FOR SELECTED EDGES:
NOTICE: Isolated segments: 0
NOTICE: Dead ends: 3
NOTICE: Potential gaps found near dead ends: 0
NOTICE: Intersections detected: 0
NOTICE: Ring geometries: 0
pgr_analyzegraph
------------------
OK
(1 row)
The examples use the Sample Data network.
See Also¶
pgr_nodeNetwork to create nodes to a not noded edge table.
Indices and tables