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Updated development guide

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poutnikl 2019-09-18 10:52:41 +02:00
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34
misc/readmes/profile_developers_guide.txt
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@ -86,6 +86,14 @@ the routing engine:
- turnInstructionCatchingRange default 40m - turnInstructionCatchingRange default 40m
- turnInstructionRoundabouts default=true=generate explicit roundabout hints - turnInstructionRoundabouts default=true=generate explicit roundabout hints
- variables to modify BRouter behaviour
- processUnusedTags
default is false. If an OSM tag is unused
within the profile, BRouter totallgy ignores tag existence
what increases BRouter speed. As sidedgjv effect, the tag is not even listed
in the route segment table nor the table exported as CSV.
- for the way section these are - for the way section these are
- turncost - turncost
@ -95,6 +103,7 @@ the routing engine:
- downhillcostfactor - downhillcostfactor
- nodeaccessgranted - nodeaccessgranted
- initialclassifier - initialclassifier
- priorityclassifier
- for the node section this is just - for the node section this is just
@ -203,6 +212,24 @@ to adding the value of "initialcost".
For backward compatibility, if "initialclassifier" = 0, it is replaced For backward compatibility, if "initialclassifier" = 0, it is replaced
by the costfactor. by the costfactor.
The priority classifier
-----------------------
Priorityclassifier is a BRouter numerical parameter
calculated for ways and used for generation of pictogram/voice navigation instructions.
Higher values means the more significant(noticable) way,
AFA it can be predicted from OSM data.
To avoid navigation instruction flood, it was decided
the instructions are provided only if:
1/ You are supposed to turn at a crossroad/junction
and some other ways have the same or higher Priorityclassifier value.
OR
2/ You are supposed to go straight ahead
and some other ways have the higher Priorityclassifier value.
Technical constraints Technical constraints
--------------------- ---------------------
@ -271,3 +298,10 @@ and that values are only appended at the end of the value lists.
This is because the routing data files adress tags and values This is because the routing data files adress tags and values
by their sequence numbers, so changing sequences would produce by their sequence numbers, so changing sequences would produce
garbage data. garbage data.
Other resources
---------------
See https://github.com/poutnikl/Brouter-profiles/wiki/Glossary
as a complementary inofficial source
about various profile internals.