[webmap-discuss] OGC and google style tiling

[Paul Spencer]

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   |
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>
>
> -- 
> Cameron Shorter
> http://cameron.shorter.net
>
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+-----------------------------------------------------------------+
|Paul Spencer                           pspencer at dmsolutions.ca   |
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|Applications & Software Development                              |
|DM Solutions Group Inc                 http://www.dmsolutions.ca/|
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