[webmap-discuss] OGC and google style tiling
Adair, Mike
Mike.Adair at CCRS.NRCan.gc.ca
Fri Apr 14 14:45:02 EDT 2006
That's the way I see it too. It's just a new model type and we need a
KaMapPane widget for it to write out the tiles in the correct way.
Mike
> -----Original Message-----
> From: Ehud Shabtai [mailto:eshabtai at gmail.com]
> Sent: Friday, April 14, 2006 4:35 AM
> To: webmap-discuss at mail.osgeo.org
> Subject: Re: [webmap-discuss] OGC and google style tiling
>
> I think that the first step should be just to use ka-map's tiles from
> within mapbuilder. This would enable the usage of ka-map's tile
> caching along with mapbuilder.
> As each tile does have a standard URL this should be similar to the
> google api support in mapbuilder?
>
>
> On 4/14/06, Cameron Shorter <cameron.shorter at gmail.com> wrote:
> > The "standard URL" I was refering to is the URL of a tile.
> >
> > Both ka-map and mapbuilder have both implemented much of the same
> > functionality. We will need to work out a logical place to split
> > between the ka-map code and the mapbuilder code.
> >
> > I think it would be difficult to use Mapbuilder without Mapbuilder
> > controls. Probably what we would need to do is convert your ka-map
> > tools to fit within the Mapbuilder framework.
> >
> > Paul Spencer wrote:
> > > Cameron,
> > >
> > > what do you mean by standard url? ka-Map has a
> javascript API that
> > > handles all the navigation including the smooth panning
> of the map.
> > > While not exactly like google, the api is roughly equivalent.
> > >
> > > Not sure if you could use mapbuilder's controls or not,
> it would be
> > > cool if you could.
> > >
> > > I'll take a stab at installing/running MapBuilder this
> weekend. Do I
> > > need to do anything special to use the Google Map layer?
> > >
> > > Cheers
> > >
> > > Paul
> > >
> > > On 13-Apr-06, at 6:26 AM, Cameron Shorter wrote:
> > >
> > >> Paul,
> > >> I'm currently allowing a Google Map layer to be included
> as one of
> > >> the layers rendered by Mapbuilder.
> > >>
> > >> So if you have a standard URL used to call a tiled map
> server, then
> > >> we can create a Mapbuilder Layer which accesses the URL (we'd
> > >> probably base our code on your existing ka-maps code).
> > >>
> > >> I'd expect that we would use the Mapbuilder pan/zoom
> type tools and
> > >> buttons rather than the ka-map tools.
> > >>
> > >> Is that what you were thinking about?
> > >>
> > >> Paul Spencer wrote:
> > >>
> > >>> What would be really nice would be to have a MapBuilder
> widget for
> > >>> ka- Map ;) Mike Adair has mentioned that this is both
> possible and
> > >>> quite easy to do. Not being very familiar with
> MapBuilder, I can't
> > >>> comment on that. But if it were possible to do, ka-Map would
> > >>> provide you a tiled interface and you could use your
> existing map
> > >>> file to do it without breaking ogc compatibility.
> > >>> Cheers
> > >>> Paul
> > >>> On 12-Apr-06, at 4:33 AM, Steven M. Ottens wrote:
> > >>>
> > >>>> Hi Bart,
> > >>>>
> > >>>> Thanks for the mailinglist tip.
> > >>>> It might be possible to rasterize our vector data, but
> we've got quite
> > >>>> some datasets and there will be more of them. It also
> makes us less
> > >>>> flexible. Obviously we've to make a trade-off on
> flexibility and
> > >>>> speed.
> > >>>> We hope that with cached tiles we can have both the
> flexibility and
> > >>>> speed. If we rasterise it would make sense to
> rasterise into fixed
> > >>>> tiles
> > >>>> I guess.
> > >>>>
> > >>>> Steven
> > >>>>
> > >>>> Bart van den Eijnden wrote:
> > >>>>
> > >>>>> Hi Steven,
> > >>>>>
> > >>>>> there is an OGC list to discuss tiling:
> > >>>>>
> > >>>>> http://lists.eogeo.org/mailman/listinfo/tiling
> > >>>>>
> > >>>>> check the archives there.
> > >>>>>
> > >>>>> What you could also do, since I assume your data is
> pretty much
> > >>>>> static, is
> > >>>>> use UMN Mapserver to rasterize all your vector data (create
> > >>>>> Geotiffs e.g.)
> > >>>>> and serve out the rasters instead. I guess the classifications
> > >>>>> used are
> > >>>>> heavy on CPU usage, and pre-classified rasters would
> solve that
> > >>>>> part at
> > >>>>> least.
> > >>>>>
> > >>>>> Best regards,
> > >>>>> Bart
> > >>>>>
> > >>>>>
> > >>>>>> Hi all,
> > >>>>>>
> > >>>>>> For those who don't know: I'm one of the lead
> developers on the
> > >>>>>> EduGIS
> > >>>>>> project, a site which aims to introduce highschool
> students to
> > >>>>>> GIS. The
> > >>>>>> site contains a webmapping part, which combined with
> so called
> > >>>>>> 'lesson-modules' can be used inside the classroom.
> > >>>>>> We aim to be able to have at least 200 students
> access the site
> > >>>>>> at one
> > >>>>>> time. Since it's being used inside the classroom it
> means that a
> > >>>>>> lot of
> > >>>>>> students will do more or less the same thing at the same time
> > >>>>>> (following
> > >>>>>> the tasks in the lesson-modules). This causes quite
> some stress
> > >>>>>> on the
> > >>>>>> server. Since it's a free site we have limited
> budget and cannot
> > >>>>>> put a
> > >>>>>> google-style server park behind it ;(
> > >>>>>>
> > >>>>>> Right now we've got apache to serverside cache the
> umn mapserver
> > >>>>>> output.
> > >>>>>> This obviously works only for those images that are
> requested twice
> > >>>>>> (like the first mapimage). Right now about 30
> students can work
> > >>>>>> at the
> > >>>>>> same time without it becoming unworkable slow. Since
> serverside
> > >>>>>> caching
> > >>>>>> works, the next logical step to boost performance
> would be using
> > >>>>>> tiles
> > >>>>>> like google.
> > >>>>>> But..
> > >>>>>> From what I know, tiling breaks OGC compatibility, right?
> > >>>>>> We're using Mapbuilder as client and we prefer to
> keep using it,
> > >>>>>> since
> > >>>>>> it's turning into a rather featureful client on the
> EduGIS site.
> > >>>>>> But the
> > >>>>>> question arises how to implement tiling inside
> WMC/OWS-context
> > >>>>>> without
> > >>>>>> breaking OGC too much.
> > >>>>>> Also I'm interested in the used algorithms to get
> tiling working.
> > >>>>>>
> > >>>>>> Cheers,
> > >>>>>> Steven
> > >>>>>>
> > >>>>>>
> > >>>>>>
> > >>>>>>
> ------------------------------------------------------------------
> > >>>>>> -- -
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> > >>>>>>
> > >>>>>>
> > >>>>>>
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>>
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> > >>>>>
> > >>>>>
> > >>>>
> > >>>>
> > >>>>
> > >>>>
> -------------------------------------------------------------------- -
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> > >>>>
> > >>>
> +-----------------------------------------------------------------+
> > >>> |Paul Spencer
> pspencer at dmsolutions.ca |
> > >>>
> +-----------------------------------------------------------------+
> > >>> |Applications & Software Development
> |
> > >>> |DM Solutions Group Inc
> http://www.dmsolutions.ca/|
> > >>>
> +-----------------------------------------------------------------+
> > >>>
> ---------------------------------------------------------------------
> > >>> To unsubscribe, e-mail:
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> > >>
> > >>
> > >>
> > >> --
> > >> Cameron Shorter
> > >> http://cameron.shorter.net
> > >>
> > >>
> ---------------------------------------------------------------------
> > >> To unsubscribe, e-mail: webmap-discuss-unsubscribe at mail.osgeo.org
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> > >>
> > >
> > >
> +-----------------------------------------------------------------+
> > > |Paul Spencer
> pspencer at dmsolutions.ca |
> > >
> +-----------------------------------------------------------------+
> > > |Applications & Software Development
> |
> > > |DM Solutions Group Inc
> http://www.dmsolutions.ca/|
> > >
> +-----------------------------------------------------------------+
> > >
> > >
> > >
> > >
> > >
> > >
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> > >
> > >
> >
> >
> > --
> > Cameron Shorter
> > http://cameron.shorter.net
> >
> >
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> >
> >
>
>
> --
> Ehud Shabtai
> http://www.freemap.co.il/map/
>
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