[OSM-talk] GPS track precision (was "GPS track upload working?")

[Andy Deakin]

Tom Hughes wrote:
> Yann Coupin wrote:
>
>   
>> You know what to do in version 2 of the track download API, right ? ;)
>>     
>
> Well only if we want to reparse several hundred thousand tracks, and 
> provide storage space for hundreds of millions of hdop values in the 
> database and we believe that the benefit from doing do (which is 
> marginal in my opinion) outweighs the costs.
>   
If the hdop values run between 0-50, in mysql you would only need a 
tinyint (1 Byte) so to store this for all 727425591 trackpoints would 
take up less than a GB. I don't think it is worth reparsing all the 
files, but just because something is not done in the past does not mean 
that it shouldn't be considered for the future.

While the hdop is added, perhaps you could also add a few more flags 
(now is when the storage space gets silly!) :-P
e.g....
As time increases, there will be an increasing number of trackpoints. 
When using JOSM, these are all downloaded for the bbox that you specify, 
and over time the number of batches of 5000 will increase. It would be 
useful to 'depreciate' tracks or points which have already been mapped 
(lie directly on a road). We do this naturally ourselves when using our 
own gpx files, in that we do not load files again which we have already 
mapped.