[OSM-talk] finding settlements where the highways do connect across the settlement
Frederik Ramm
frederik at remote.org
Wed Jul 4 20:30:50 UTC 2018
Hi,
On 07/04/2018 06:12 PM, john whelan wrote:
> I'm using JOSM and find unconnected highways is useful but in Africa I'm
> seeing a number of settlements that have highways entering on both sides
> but nothing connecting them which poses problems for routing software.
A very very long time ago, when the US data consisted of about 99.9%
untouched TIGER import, all road connectivity was broken at every county
border. County borders had not yet been imported so you couldn't just
mosey along the county boundaries and mend roads either. Andy Allan,
then working for CloudMade, ran a connectivity check by building a
matrix of (100 by 100? don't remember) bigger cities and compared the
routing distance to the bee line distance. Where the routing distance
was larger than bee line by a factor of larger than something like 1.5
(don't remember), the entry was highlighted as "potentially affected by
a connectivity issue" that humans could then hunt down.
I fear the approach will need quite some adaptation to work in rural
Africa but maybe it works on the small scale.
Bye
Frederik
--
Frederik Ramm ## eMail frederik at remote.org ## N49°00'09" E008°23'33"
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