Gavin’s Odd Bits of Code

2008-04-10 (Thu)

Ordnance Survey Tile Count Exceeded

Filed under: Google Earth — Gavin Brock @ 10:51 pm
Tags: ,


Ordnace Survey Sorry Message

Tiles Used: 34642 of 30000

I guess my OS Overlay is getting more well known! This is the first time I have run out of my allocated tiles.

I’m going to monitor this for a while to see how chronic the issue is, and if necessary, ration tiles by source IP address, or even beg the OS for a bigger quota!



  1. Happy to mirror with my own API key if it helps – thanks for providing the service thus far, been very useful!

    Comment by Kenrick — 2008-04-12 (Sat) @ 10:07 am | Reply

  2. Kenrick – thank you for the offer. I’m hoping to clean up my code and make it presentable to the general public in the not too distant future.

    I was wondering about some sort of distributed way of spreading the load across multiple keys. The problem is if too many people are doing this, and generating too much traffic – the OS may decide to crack down block GE entirely – it is easy for them to do that.

    Initially I am considering just capping the heaviest users to encourage efficient usage of the OS’s service, and seeing if the quota can keep going for 24 hours.

    I’ll post more details soon.

    Comment by brockgr — 2008-04-12 (Sat) @ 12:06 pm | Reply

  3. Sounds like you’ve thought several moves ahead – good insight.

    Look forward to taking a look at the code when it’s ready :)

    Comment by Kenrick — 2008-04-14 (Mon) @ 6:57 am | Reply

  4. I am also supporting the idea!
    Let me know if I can be of any help. I run my own website with my own webserver, we can definitely use it!


    Comment by tilusnet — 2009-05-06 (Wed) @ 8:45 am | Reply

  5. Me again.
    It is true that the tiles are not cached in GE? My caching settings are turned on allowing 2000M storage, still when I navigate back to a tile that I’ve just recently seen, the old tile is always freshly downloaded…
    I was wondering whether this is a GE limitation otherwise there could be done an OS Survey change for caching? It could dramatically slow down the tile download counter… Just a thought, let me know what do you think.


    Comment by tilusnet — 2009-05-06 (Wed) @ 4:39 pm | Reply

  6. As far as I can tell, the caching of tiles is negotiated between Google Earth and the OS web server providing the tiles. I only provide links to the tiles and I don’t think I can influence the negotiation.

    Regarding mirroring the service, this is still something that is on my mind. However I am currently in discussions with the OS over the future of this service, and so I don’t think it’s worth jeopardizing your API key at this point.

    Comment by brockgr — 2009-05-07 (Thu) @ 11:32 am | Reply

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