[OSM-talk] Mapping and surveying long road tunnels
Raphaël Jacquot
sxpert at sxpert.org
Fri Mar 23 07:31:09 GMT 2007
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...
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