Hello Jukka,
On 03/12/14 10:13, Jukka Rahkonen wrote:
Homme Zwaagstra <hrz <at> geodata.soton.ac.uk> writes:
>
>>
>> Hello,
>>
>> I've come up against a problem with `gdalbuildvrt` taking a long
time to
>> create
>> a VRT when it is passed a large number of source datasets. I am trying
>> to create
>> a VRT file for a zoom level in a TMS structure containing JPEG
tiles. The
>> command I'm using is:
>>
>> gdalbuildvrt output.vrt `find ./tiles/18 -iname *.jpg -printf "%p "`
>>
>> where the number of tiles is:
>>
>> $ find ./tiles/18 -iname *.jpg | wc -l
>> 767104
>
> I would say that you are doing all wrong thing. First, the jpeg tiles in
> tile service directory structure are not referenced with world files
(.jgw)
> or anything and your .vrt file would be useless.
Sorry, I should have said: each of the JPEG tiles has an accompanying
`*.aux.xml` file. The files were created under the hood by GDAL using
<https://github.com/geo-data/cesium-terrain-builder#ctb-tile>.
The right thing to do is to study the file naming schema that the cache is
> using. When the schema is known the right tile can be found directly
because
> the logic knows how the tile directory structure is like and which
names are
> used for the tiles. If it is an OSGeo TMS schema it is described here
>
http://wiki.osgeo.org/wiki/Tile_Map_Service_Specification#TileMapService_Resource
The on-disk tiling scheme conforms to
<http://wiki.osgeo.org/wiki/Tile_Map_Service_Specification#global-mercator>
with
the tile directory structure matching `{zoom}/{x}/{y}.jpg`.
Best regards,
Homme
> If it is using the Google/Bing tile naming schema then you can find
examples
> here http://www.gdal.org/frmt_wms.html. But if it is a GeoWebCache tile
> cache you may be out of luck because I haven't seen so far any
configuration
> file that would make GWC tilecache usable for GDAL.
>
> -Jukka Rahkonen-
>
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