[OSM-talk] geojson

Frans Thamura frans at meruvian.org
Sat Jan 21 10:16:29 GMT 2012


i post another question related to this, in the OSM API question

we will see, :) we will use your JSON model :)

and we can see what issue will raise up, and we have started the
threada about this scalability. that will become my homework to solve
that, when it happen

F


On Sat, Jan 21, 2012 at 5:08 PM, Graham Jones <grahamjones139 at gmail.com> wrote:
> Hi Frans,
> I haven't checked Nick's code, but I think that it works by the client
> requesting data for the specific area that is being displayed on the map.
> The BrewMap code just uses a single data file to cover the entire area (in
> this case the uk), so even if you zoom in very close, it still uses data for
> the whole uk.   This is fine if you only have a few hundred data points, but
> will become very slow if you have tens of thousands.
>
> Now for low zoom levels (large displayed areas) this amounts to the same
> thing, so there would be no benefit, unless you do some filtering on the
> server side to simplify the data (eg group POIs if they are going to be
> plotted on top of each other).   I have not done this yet, but Nick, and the
> folks working on KothicJS are likely to have thought about it and may have
> solutions, which is why I think it is worth investigating how they do it.
>
> Whether it is worth putting effort into simplifying the data on the server
> depends on how much data you are dealing with.
>
> Regards
>
> Graham.
>
> --
> Graham Jones
> Hartlepool, UK.
>



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