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Re: [sumo-user] Coordinate system for osm.net.xml file outputs - Projection Problem
  • From: Michael Behrisch <oss@xxxxxxxxxxx>
  • Date: Wed, 17 Apr 2019 07:05:48 +0200
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Hi Barry,
sumo's netconvert uses the proj library to convert WGS84 OSM coordinates
to UTM and then adds an offset to have the lower left corner
approximately at 0,0 (to make the coordinates easier to read and reduce
floating point errors when calculating). To convert it back the easiest
way is to use sumolib, see
https://sumo.dlr.de/wiki/Tools/Sumolib#coordinate_transformations but if
you want to do it yourself you can just subtract the offset from your
coordinates and project it back from UTM with the tool of your choice
(if you use proj, you have the proj option string already there).

Best regards,
Michael

Am 16.04.19 um 18:23 schrieb Evans, Barry:
> Hi all,
> 
>  
> 
> I’ve used the WebWizard to generate a network file and I’ve converted
> the lines into a JSON format. I need to fix the projection though as to
> overlay it onto a map. The line coordinates are defined as followed:
> 
>  
> 
> shape="2341.81,2313.86 2340.45,2313.94 2339.52,2313.95 2338.58,2313.93
> 2337.22,2313.89"
> 
>  
> 
> I assume these maybe coordinates from a lower left corner. Does anyone
> know how to use the reference data to convert these to British national
> Grid or to Lat Longs (WGS84). The location coordinate component which
> gives some information shows this:
> 
>  
> 
> <location netOffset="-526561.27,-5698105.60"
> convBoundary="0.00,-0.00,5740.81,3968.92"
> origBoundary="-2.712703,51.422728,-2.534214,51.500660"
> projParameter="+proj=utm +zone=30 +ellps=WGS84 +datum=WGS84 +units=m
> +no_defs"/>
> 
>  
> 
> I can’t see how to use this to reproject the data though.
> 
>  
> 
> Any help would be greatly appreciated.
> 
>  
> 
> Kind regards,
> 
>  
> 
> Barry
> 
>  
> 
> Dr Barry Evans BSc(Hons), MSc, PhD
> 
> College of Engineering, Mathematics and Physical Sciences,
> 
> Harrison Building,
> 
> University of Exeter,
> 
> North Park Road,
> 
> Exeter,
> 
> EX4 4QF
> 
>  
> 
> Tel: +44(0)1392724075
> 
> Email: b.evans@xxxxxxxxxxxx <mailto:b.evans@xxxxxxxxxxxx>
> 
>  
> 
> 
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