Multiple MapProviders as Layers

[Markus]

Hello again,

I am wondering if there is a way to use multiple MapProviders and then show them on top of each other. For example a Providers-property instead of a Provider-property in the RadMap-class.
As far as I've seen the InformationLayer and the DynamicLayer is no option for us since we want to deliver tiles.

Best regards
   Markus

[Andrey]

Hi Markus,

Unfortunately it is not possible in the current version. But this feature is planned for the 2010.Q3 release. You can check its availability using our PITS:

http://www.telerik.com/support/pits.aspx#/public/silverlight/31

Greetings,
Andrey Murzov
the Telerik team

[Jason D]

Until this is released, would a valid alternative be to create a custom provider that merges tiles together and returns a single tile image?

[Andrey]

Hi Jason,

It might be possible to create a map provider which merges tiles from two image sources, but we cannot recommend such approach as it would be rather complicated and error-prone task with lots of synchronization issues that need to be addressed.


All the best,
Andrey Murzov
the Telerik team

[Jason D]

I updated to the new version with multiple provider support using the blog example. It sort of works, so looking for some guidance. For my custom TiledMapSource, I only have tiles for which there is actually data. For example, our data may be restricted to a small area, such as 1 mile by 1 mile. My data shows up, but the other tiles do not, unless they are already cached. How should I handle this?

Possibly related, it take about 10 seconds for my *one* tile to show up and I'm getting alot of System.Net.WebExceptions.

[Jason D]

I will be out on vacation this week, so I will not be able to reply to any responses. If we can get this to work, we will probably make a purchase. Thanks in advance.

[Andrey]

Hello Jason,

If you have a few small regions with tiles and all other regions of the map are empty, then you can use the new feature of the RadMap control - geographically limited tile providers. For example, the following XAML shows 2 OpenStreet 1x1 mile "windows":

<telerik:RadMap Name="radMap"
        ZoomLevel="12"
        DistanceUnit="Mile"
        Center="45.133, -75.7396">
    <telerik:RadMap.Providers>
        <telerik:EmptyProvider />
        <telerik:OpenStreetMapProvider telerik:MapLayer.ZoomRange="12,19"
               GeoBounds="45.133,-75.7396,1,1" />
        <telerik:OpenStreetMapProvider telerik:MapLayer.ZoomRange="12,19"
               GeoBounds="45.233,-75.7396,1,1" />
    </telerik:RadMap.Providers>
</telerik:RadMap>

Greetings,
Andrey Murzov
the Telerik team

[Jason D]

Thank you. Everything is working great. I fixed the delay by implementing the caching system (I just call GetTile from GetCachedTile). Unless I'm doing something wrong, I would suggest this area be looked at. I can see GetTile is called and I immediately return tiles, but there are several seconds before they show up. If I return the tile using GetCachedTile there is no delay. I can submit a ticket with sample data if you would like.

[Andrey]

Hi Jason,

The caching system allows the customization.
I'm not sure about a way you use. It will be interesting to look at your implementation.
So, it will be great if you send to us your code for additional review.

All the best,
Andrey Murzov
the Telerik team

[Jason D]

I opened a ticket and included my sample code and tiles. Thanks.

[Andrey]

Hi Jason,

Thanks a lot for the sample solution.
We have reproduced the problem. We have created the PITS issue to fix it. You can track it using the following link:
http://www.telerik.com/support/pits.aspx#/public/wpf/5583

Regards,
Andrey Murzov
the Telerik team