[Merkaartor] What's coming in?: short-term roadmap

Chris Browet cbro at semperpax.com
Fri Nov 5 09:42:27 GMT 2010


On Fri, Nov 5, 2010 at 09:48, Toby Speight <T.M.Speight.90 at cantab.net>wrote:

> 0> In article <
> AANLkTikE5uqW+5_zyzO1bpK_UGnYUtd9L6CJ6PW12R1z at mail.gmail.com<AANLkTikE5uqW%2B5_zyzO1bpK_UGnYUtd9L6CJ6PW12R1z at mail.gmail.com>
> >,
> 0> Chris Browet <URL:mailto:cbro at semperpax.com> ("Chris") wrote:
>
> Chris> The tests I've been running with Spatialite for the plugin
> Chris> incite me of thinking about a *Spatialite backend* for
> Chris> Merkaartor, alongside the traditional memory/XML current way.
> Chris> The advantages will be a builtin spatial index (hopefully no
> Chris> more "indexing...")  and the possibility to load and query far
> Chris> greater datasets than is possible today.
>
>
> 0> In article <87r5f029gg.fsf at balti.ashgrove>,
> 0> Toby Speight <URL:mailto:T.M.Speight.90 at cantab.net> ("Toby") wrote:
>
> Toby> Something I've been contemplating for a while is to build a tool for
> Toby> helping find duplicate or very close nodes (without continuously
> Toby> switching to and from KeepRight).  It sounds like I should hold off
> this
> Toby> until the spatial index code is stabilised?
>
>
> 0> In article <AANLkTinq7BGp_7EitOz6EnQTLOOqZ6y0=
> k7SH1Uvw4s_ at mail.gmail.com>,
> 0> Chris Browet <URL:mailto:cbro at semperpax.com> ("Chris") wrote:
>
> Chris> Not necessarily.
> Chris>
> Chris> Using Spatialite as a backend, the usual Node/Way/Relation
> Chris> interface will still be there.  What would change is the way
> Chris> they are saved/restored and their lifecycle (i.e. they could be
> Chris> generated "on-demand" from the backend)
>
> Okay, thanks.
>
> Although I haven't started anything yet, I'm expecting to need to build
> a spatial index of the relevant area in order to find proximate pairs,
> so I thought that the Spatialite index might save me re-implementing
> code.
>
> But I probably need to study the code a bit first.
>

There is already an in-memory rtree spatial index at the layer level, so
you're spared the work anyway ;-)

- Chris -
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