[Talk-us] JOSM zoom limits per server solved (fixes Tiger grey overlay )

Ian Dees ian.dees at gmail.com
Sun Sep 23 19:21:53 BST 2012


The "root cause" if you will, is that TileStache doesn't support 404ing
instead of grey tiles when a request falls out of the specified bounds. If
someone wants to code that up and submit a pull request, I would much
rather use that.

On Sun, Sep 23, 2012 at 1:18 PM, Alan Millar <grunthos503 at yahoo.com> wrote:

> I also found there is a minimum zoom also. Put it in the url as min,max
> like
>
> tms[16,19]:http://...
>
> Fixes the grey tiles when I zoom back out.
>
> - Alan
>
>
> On Sep 23, 2012, at 12:54 AM, Toby Murray <toby.murray at gmail.com> wrote:
>
> I knew about the max zoom setting but for some reason never thought about
> applying it to the TIGER tiles to fix the grey....
>
> Toby
> On Sep 21, 2012 1:23 PM, "Alan Millar" <grunthos503 at yahoo.com> wrote:
>
>> Maybe everyone else knows this, but I just discovered it myself so I
>> thought I would share it.
>>
>> I've been using Remap-a-tron to fix up US roads.  I use both the Bing
>> imagery and the TIGER 2012 tiles overlaid, and it makes it really
>> useful.
>>
>> However, I've been frustrated that I can pretty far in with the Bing
>> images, but if I go too far, the Tiger (normally transparent) tiles turn
>> grey and obscure the Bing images.  I've been continually turning off and
>> back on the Tiger layer, which is a bit annoying after a while.
>>
>> JOSM has an easy limit in the Preferences for the maximum zoom, but it
>> affects everything.  I set it to 19, and then I did not get the grey
>> boxes from Tiger, but did not get the higher detailed photos from Bing
>> either.
>>
>> As it turns out, JOSM does have a max-zoom per tile server feature; it
>> just is not obvious or clearly documented that I could find.
>>
>> You can enter it as part of the TMS url like this:
>>
>> tms[19]:http://{switch:a,b,c}.
>> tile.openstreetmap.us/tiger2012_roads/{zoom}/{x}/{y}.png<http://tile.openstreetmap.us/tiger2012_roads/%7Bzoom%7D/%7Bx%7D/%7By%7D.png>
>>
>> The number 19, right up front, says that the maximum zoom to use for
>> this layer is 19.  This solved the whole thing for me.
>>
>> I also found that if you go into Josm preferences in expert mode, and
>> dig and dig and dig into the imagery providers entries, this is labeled
>> as max-zoom.  Too bad it isn't easier to find.
>>
>> Anyways, hope this helps others too.
>>
>> - Alan
>>
>>
>>
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