[pgrouting-users] How to merge GPS traces which are close to each other

[Raghavan Krishnasamylakshmanaperumal]

Thanks for the response. Sure I will check if openstreetmap or GRASS GIS
and keep posted if I can solve this issue.

Thanks,
Raghavan


On Wed, Apr 2, 2014 at 2:39 PM, Stephen Mather <stephen at smathermather.com>wrote:

> The openstreetmap community has also done some good practical work in this
> domain.
>
> Best,
> Steve
> On Apr 2, 2014 1:09 PM, "Stephen Woodbridge" <woodbri at swoodbridge.com>
> wrote:
>
>> On 4/2/2014 12:16 PM, Raghavan Krishnasamylakshmanaperumal wrote:
>>
>>> Hello Everyone,
>>>
>>> I have raw GPS points collected from runkeeper(runner/biker) traces.
>>>  From these points I am creating linestrings and on linestrings I am
>>> applying pgr_nodeNetwork to create the network edge table and then
>>>   using pgr_createTopology to build the topology with source and target
>>> information.
>>>
>>> How can I merge the gps traces which are close to each other, for
>>> example look at the picture which I have attached in which there are 3
>>> GPS traces(red,green,blue) which are close to each  and while forming
>>> the network graph I want these traces to be considered as a single
>>> trace(as shown in black color). It will be better to get the average of
>>> those 3 GPS traces to form a single GPS trace by this way I may get rid
>>> of the noise on the GPS traces obtained from runkeeper.
>>>
>>> Is there a function in pgRouting to make this possible?
>>>
>>
>> No pgRouting does not have a function for this. While it would be useful,
>> I think it falls more under PostGIS because this is a geometry problem.
>>
>> I will also note that the problem is not well defined. Consider the case
>> where you have an exit ramp the parallels the highway for some time before
>> connecting to a cross road or veering away from the highway. In this case
>> how does one determine where to make the intersection of the ramp and
>> highway?
>>
>> Ask the PostGIS list for some ideas. You might also ask GRASS GIS list
>> they might have some tools for this.
>>
>> -Steve
>>
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-- 
Thanks and Regards,
Raghavan KL
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