[pgrouting-users] How to interpret the outcome of pgr_analyzeGraph()
kaiserasif at gmail.com
Thu Apr 3 15:10:13 PDT 2014
I got the following message output from pgr_analyzeGraph():
NOTICE: Performing checks, pelase 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: 62
NOTICE: Dead ends: 227
NOTICE: Potential gaps found near dead ends: 7
NOTICE: Intersections detected: 1760018
NOTICE: Ring geometries: 8
Total query runtime: 512185 ms.
- What do the last 3 count means?
- Does the *intersection* count means that the graph needs to be "noded" so
that all intersections are converted into nodes? how to do that? increasing
the tolerance in pgr_nodeNetwork() increased the number of intersections.
- on related note: why is there a tolerance in pgr_createTopology? What I
understand is: all edges shorter than the tolerance will be marked as loop
(sets target = source). So if AB and BC were segments from a trace and AB <
tolerance, then the result is AA and BC. ABC path becomes disconnected. I
don't want that.
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