[OSM-talk] please help transform of coords for Prishtina DXF

[Aun Yngve Johnsen]

Since all the positions you have should be related into one square  
sheet in AutoCAD, there must be some other way to get the positions  
out than just UTM/WGS84. There are probably some sort of reference,  
for example to a corner of the sheet for the relative positions. If  
somebody are able to open the original CAD drawing they should be able  
to spot this.

brgds
Aun Johnsen



On 24/01/2010, at 10:12, jamesmikedupont at googlemail.com wrote:

> I have here a dxf file of Prishtina in high quality.
> http://www.archive.org/details/PrishtinaStreets
>
> I have been able to convert it to lat/lon like this
> cs2cs +proj=utm  +zone=34T +ellps=WGS84 +datum=WGS84 +units=m -f \"%. 
> 7f\"
>
> Problem is that most of the points are in relative position, there  
> is a grid.
>
> I have pushed a version of two nickels that can process alot of this :
> To git at github.com:h4ck3rm1k3/TwoNickels.git
>   c8e4009..41f23f1  master -> master
>
> It produces osm files with data in three groups :
>
> 1. points that are exact on the mark, (few)
> 2. points on the equator (0,0) relative to something
> 3. points that seem to be shifted over from utm34T
>
>         720496.25, 506444.9375 -> 22.987450699423831679,  
> 4.5791053696411907481
>
> I have created averages of good points versus the shifted ones and
> came up with these constant shifts:
> 	$n -= 187380;
> 	$e += 4228672;
>
> They are still 15km off of prishtina..
>
>
> So I would like one of you to please help with the autocad and
> transform all coordinates into some single form so I can convert them.
> Or please advice on these points.
>
> thanks,
> mike
>
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