[OSGeo-Discuss] Thoughts on how to use elevation in routing

Stephen Woodbridge woodbri at swoodbridge.com
Wed Sep 15 07:24:53 PDT 2010

Yes, on the OSGeo Discuss list there was the interesting suggestion that 
one could compute the viewshed for points along a road segment to get an 
estimate of the potential view from that segment. I'm thinking about 
doing this in the future since I already have the DEM which would be 
required for the US. The BIG problem is how to do this from a great many 
points as it is compute cost heavy.

There are also problems with vegetation blocking the view, but just 
computing the potential view based on the DEM might be a good starting 
point. By comparing the difference between a DEM that looks at the 
ground and one that looks at the vegetation you can probably get a good 
idea of whether or not the view is hidden by the vegetation.

So many ideas and so little time and compute power <sigh>.

In the idea of costing cross traffic turns higher than with traffic 
turns, this would be a very cool feature to have in pgRouting. In the 
abstract we are adding a cost at a node based on a rule. If the rules 
are extensible, then a node might also represent a bus stop and a 
schedule such that given an arrival time at the stop we can cost then 
compute the wait time for each successive departure when doing 
multi-modal routing.


On 9/15/2010 10:09 AM, Anton Patrushev wrote:
> Correct, but not with only right (left) turns, but with much higher
> costs for left (right) turns.
> Slightly off the topic - at the FOSS4G conference poster session I saw
> very interesting application for tourism with costs assigned according
> to how beautiful or interesting road segments are.
> Anton.
> On Wed, Sep 15, 2010 at 7:22 AM, Geoff Hay<geoffrey.hay at otago.ac.nz>  wrote:
>> Hi All
>> I seem to remember reading somewhere that UPS delivery routes are
>> constructed with only right turns (or left depending on the country) so as
>> to make use of 'free' turns to avoid waiting at traffic lights.
>> Geoff
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