Re: [geowebcache-users] GeoWebCache directory/file name structure

[samclemmens <geo...@gm...>]

Cheers, Arne!

I'm curious; what was the rationale for creating a directory structure with
just one level?  We processed a data set earlier this week, which resulted
in 400,000 directories.  When I tried to an "ls", my PuTTY console froze...

Peter



Arne Kepp-2 wrote:
> 
> 1) "zoom level". For the default EPSG:900913 grid z=0 means the whole 
> world in 4 tiles
> 
> 2) Hm,,, good point. I dont think I went back and updated that wiki 
> page, it was not more than a scratchpad for sharing ideas. The actual 
> code is here[1], the difference is that the bit shifting starts with 2, 
> effectively making it  2^( 1 +  ( z / 2 )). And there's some zero-padding.
> 
> 3) The catch is that you need to know a little bit of Java, but if you 
> do then it's potentially straightforward. It depends what the OpenSpace 
> structure is based on, and whether we have similar tokens in GWC.
> 
> blobstore/file contains an implementation of BlobStore. You can copy the 
> whole thing to a new package, and then make the FilePathGenerator output 
> the structure you want. It is linked into the application using Spring, 
> WEB-INF/geowebcache-core-context.xml , if you are working off trunk. I 
> would guess that you also want a particular GridSet to go with that, to 
> match the resolutions and origin used by OpenSpace.
> 
> It's possible someone has already done it, but so far I have not heard 
> about it.
> 
> -Arne
> 
> 1: 
> http://geowebcache.org/trac/browser/trunk/geowebcache/core/src/main/java/org/geowebcache/storage/blobstore/file/FilePathGenerator.java
> 
> 
> On 06/08/2010 05:33 PM, samclemmens wrote:
>> Hi,
>>
>> I'm relatively new to GeoWebCache...and I'm a bit puzzled by the
>> directory/file name structure that is produced.  I have a few questions,
>> namely:
>>
>> 1.  The documentation states that the naming convention is:
>> layername/projection_z/[x/(2^(z/2))]_[y/(2^(z/2))]/x_y.extension    What
>> is
>> the z value?
>>
>> 2.  Given the sample output
>> .\gwc\roads\EPSG_900913_12\006_019\000848_002540.png, I assume that z=12,
>> x=848, and y=2540.  Obviously the above formula won't produce 006_019
>> based
>> on these numbers.  What conversion is required?
>>
>> 3.  Is it possible to change the directory/file name format?  I'd like to
>> create a data set that can be used by Ordnance Survey OpenSpace, which
>> uses
>> a different structure based on the British National Grid.
>>
>> Cheers,
>>
>> Peter
>>    
> 
> 
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