Map tiles are jumbled up, corrupting map

3 posts, 1 answers
  1. Daniel
    Daniel avatar
    2 posts
    Member since:
    Aug 2016

    Posted 27 Sep Link to this post

    The attached files show what I see when I run the SDK Samples Browser and choose the OSM or Bing provider examples. Basically the map tiles appear in the wrong places and so you get a mixed-up "jigsaw puzzle" effect. This doesn't happen at the initial zoomed-out level, but happens immediately when I change the zoom. It also happens as I scroll around.

    However, I only see this when running inside our corporate network! I don't see the problem when running the same SDK sample on my home network. The same is true for several of my colleagues.

    Our IT manager says this problem must be due to a bug in Telerik. He also reports that he sees the problem on his home network and he produced a similar screenshot.

    How can I go about troubleshooting this issue? What could be causing the map tiles to get mixed up?

  2. Answer
    Martin
    Admin
    Martin avatar
    1101 posts

    Posted 28 Sep Link to this post

    Hello Daniel,

    Once in a while a scrambled tiles issue pops up. Nevertheless, we can't reproduce it on our side. But it seems that, mostly, this could happen when a proxy server is used or there are internet (or other network) connection issues. You can double check if your work systems are making their data transfer with the world wide via a proxy. And also your can see your internet performance.

    Also, you can try different tile caching options for the map. By default RadMap uses the built-in .NET caching mechanism and the default request cache level is set to CacheIfAvailable. You can try different levels using the map provider's RequestCacheLevel property and set the IsTileCachingEnabled property to False. Another thing you can try is to manually delete the tiles cache.
    string profile = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
    string cachePath = profile + "\\TelerikMapCache";
    Directory.Delete(cachePath, true);

    Any additional information about your device/network setup could be useful for investigating this.

    Regards,
    Martin
    Telerik by Progress
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  4. Daniel
    Daniel avatar
    2 posts
    Member since:
    Aug 2016

    Posted 04 Oct in reply to Martin Link to this post

    Hi, turns out we are using Sophos proxy in our internal network and your OSM example demonstrates it is broken! :)

    We can create or stop the problem by changing proxy settings in the Internet Options dialog in Control Panel (also clearing the browser cache between tests, as the broken/good data remains in the cache which can cause further confusion when troubleshooting).

    Thanks for your help. We are now looking for business approval to buy Telerik licenses.

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