[OSM-dev] curves

[Artem Pavlenko]

On 3 Jan 2008, at 16:57, Andy Robinson ((blackadder)) wrote:

> Frederik Ramm wrote:
>> Sent: 03 January 2008 4:53 PM
>> To: Robert (Jamie) Munro
>> Cc: dev Openstreetmap
>> Subject: Re: [OSM-dev] curves
>>
>> Hi,
>>
>>>> What people think about explicitly supporting curves as a part of
>>>> geometry model? This way we can model the world better.
>>>
>>> When I suggested this before, someone said it was patented,  
>>> possibly by
>>> either NavTeq or TeleAtlas,
>>
>> Navteq seem to have a patent on using Bezier curves for road network
>> representation or something. It was on the lists here.
>
> Try this for size:
>
> http://www.freepatentsonline.com/7007011.html
>

but this one is not about representing geometry as series of command :

moveto
lineto
curveto

Is SVG patented ?

Artem

> Cheers
>
> Andy
>
>>
>> I also find the idea very tempting, however one has to bear in  
>> mind that
>> some things could then become very difficult. For example,  
>> computing the
>> combined length of all motorways is trivial today, and will probably
>> require specialist tools if we go Bezier. Equally, finding  
>> intersections
>> and the like (think Validator plugin) - probably a computational
>> nightmare if Beziers are involved.
>>
>> Will the built-in PostGIS stuff ("give me everything that intersects
>> with this rectangle") work out-of-the box with Beziers?
>>
>> Bye
>> Frederik
>>
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>
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