[OSM-talk] Mapping and surveying long road tunnels

[Raphaël Jacquot]

Jon Burgess wrote:
> On Thu, 2007-03-22 at 16:02 +0100, Raphaël Jacquot wrote:
>> Simon Hewison a écrit :
>>> Raphaël Jacquot wrote:
>>>> or, we could use IMUs and some kalmann filtering
>>> or video surveying. Marking key points on video frames from twin video 
>>> cameras (stereo vision) with the same focal length will get you a distance 
>>> of point on edge of tunnel from point of view. Couple with a distance 
>>> measurement from wheel counter and you have a quite clever system.
>>>
>>> This is partly what those geospatialvision and the amazon mechanical turk 
>>> slaves do.
>>>
>> yes, but an IMU will give you points that you can insert into the GPX
>> file directly, which is much less work
>>
> 
> The cost of some IMUs is almost low enough for me to consider getting
> one to experiment with, e.g.
> http://www.sparkfun.com/commerce/categories.php?cPath=23_85
> 
> 
> 
> 	Jon
> 
> 

problem is, those are bluetooth devices, that will be rather useless 
inside a car, with a cell phone running at the same time...