[webmap-discuss] OGC and google style tiling

[Cameron Shorter]

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
>>>>>>
>>>>>>
>>>>>>
>>>>>> ------------------------------------------------------------------ 
>>>>>> -- -
>>>>>> To unsubscribe, e-mail: webmap-discuss-unsubscribe at mail.osgeo.org
>>>>>> For additional commands, e-mail: webmap-discuss- help at mail.osgeo.org
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> ------------------------------------------------------------------- --
>>>>> To unsubscribe, e-mail: webmap-discuss-unsubscribe at mail.osgeo.org
>>>>> For additional commands, e-mail: webmap-discuss-help at mail.osgeo.org
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>> -------------------------------------------------------------------- -
>>>> To unsubscribe, e-mail: webmap-discuss-unsubscribe at mail.osgeo.org
>>>> For additional commands, e-mail: webmap-discuss-help at mail.osgeo.org
>>>>
>>> +-----------------------------------------------------------------+
>>> |Paul Spencer                           pspencer at dmsolutions.ca   |
>>> +-----------------------------------------------------------------+
>>> |Applications & Software Development                              |
>>> |DM Solutions Group Inc                 http://www.dmsolutions.ca/|
>>> +-----------------------------------------------------------------+
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: webmap-discuss-unsubscribe at mail.osgeo.org
>>> For additional commands, e-mail: webmap-discuss-help at mail.osgeo.org
>>
>>
>>
>> -- 
>> Cameron Shorter
>> http://cameron.shorter.net
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: webmap-discuss-unsubscribe at mail.osgeo.org
>> For additional commands, e-mail: webmap-discuss-help at mail.osgeo.org
>>
> 
> +-----------------------------------------------------------------+
> |Paul Spencer                           pspencer at dmsolutions.ca   |
> +-----------------------------------------------------------------+
> |Applications & Software Development                              |
> |DM Solutions Group Inc                 http://www.dmsolutions.ca/|
> +-----------------------------------------------------------------+
> 
> 
> 
> 
> 
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: webmap-discuss-unsubscribe at mail.osgeo.org
> For additional commands, e-mail: webmap-discuss-help at mail.osgeo.org
> 
> 


-- 
Cameron Shorter
http://cameron.shorter.net