[mapguide-users] What is Tile Map?

[Kenneth Skovhede, GEOGRAF A/S]

Tiles are not related to the raster workshop as such.

When you request a map in MGOS, it renders all features on the server 
and sends the resulting image
to the client. This can take a long time, especially if the data is complex.

One solution would be to pregenerate all possible sizes and displays of 
the map, but that would result
in a HUGE number of images. This would also be annoying if you wanted to 
turn a layer on or off.

Instead, MapGuide can serve tiles in a grid, so that a user with a 
600x600 display gets two tile rows
and two tile cols (a 300x300 tile). A user with a 900x900 display can 
then use the same tiles plus some more.

These tiles can then be saved, so that no processing power is required 
for subsequent rendering.
To make sure that it is possile to turn layers on/off MapGuide makes 
tiles from special groups,
known as "base layers". You can then have ordinary layers and groups 
displayed on top of the base layer tiles.

This also makes it possible to have dynamic data displayed up-to-date, 
while stale
background data takes up very few resources.

Regards, Kenneth Skovhede, GEOGRAF A/S



nelyass.heglig at gnpoc.com skrev:
> Many thanks for your reply
>
> As I know from mapguide 6.5 tile maps means that the map image is
> divided into tiles (a network gird like).
> Which means when you zoom to an area the server sends you only the
> viewed tiles in that area the same concept as in google earch.
>
> As I remember the was utitlity in mapguide 6.5 called raster workshop
> can divide raster format data into tiles. 
>
> My question is the same concept applied in mapguide open source or not?
>
> And does the server divide the map image into a grid of tiles or not?
>
> Thanks 
>
>
> Nadir Elyass
>
>
> -----Original Message-----
> From: mapguide-users-bounces at lists.osgeo.org
> [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Zac Spitzer
> Sent: Friday, December 19, 2008 3:11 PM
> To: MapGuide Users Mail List
> Subject: Re: [mapguide-users] What is Tile Map?
>
> On Fri, Dec 19, 2008 at 10:57 PM,  <nelyass.heglig at gnpoc.com> wrote:
>   
>> Sirs,
>>
>>
>>
>> Would you tell what are the deferences between Tile map and ordinary
>>     
> map
>
> tiled maps are cached (unless otherwise configured)
>
>   
>>
>> Which one has a greater performance?
>>     
>
> tiled because of cachng
>
>   
>>
>> What happen behind the seen with the data from the server and client
>>     
> sides?
>   
>
> I don't know what your asking here???
>
>   
>> Do all data format (sdf, shp, raster etc.) can be used in tile maps?
>>     
>
> there is no difference here between tiled and dynamic maps
>
>   
>>
>> Thanks in advance
>>
>>
>>
>> Nadir Elyass
>>
>> _______________________________________________
>> mapguide-users mailing list
>> mapguide-users at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/mapguide-users
>>
>>
>>     
>
>
>
>   
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