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I have exported a map from tilemill as mbtiles and converted them to xyz tiles with help of mbutil. The tiles should be used (for learning purpose) with mod_tile or GeoServer and displayed in OpenLayers.

in OpenLayers already exists a bunch of layers using the gauß-krüger projection.

Do you know a program which runs under ubuntu-terminal to reproject these tiles from Mercator to Gauß-Krüger projection to have only one used projection?

Inspecting a raster tile with gdalinfo gives me following info:

Driver: PNG/Portable Network Graphics
Files: /Users/srv/Desktop/tiles/11/586/784.png
Size is 256, 256
Coordinate System is `'
Corner Coordinates:
Upper Left  (    0.0,    0.0)
Lower Left  (    0.0,  256.0)
Upper Right (  256.0,    0.0)
Lower Right (  256.0,  256.0)
Center      (  128.0,  128.0)
Band 1 Block=256x1 Type=Byte, ColorInterp=Palette
Image Structure Metadata:
NBITS=1
Color Table (RGB with 1 entries)
0: 245,253,240,255
  • The tiles aren't really in Mercator. They're in an almost-Mercator ("web Mercator"). Translating individual tiles doesn't make a lot of sense though - as you've seen, they're just unreferenced pictures and the tile schema makes the projection. Can you tell us what you're trying to do (in the end - the "why" of the reprojection) and we might be able to help to achieve that. – BradHards Dec 24 '14 at 9:53
  • hey, thanks for your answer! I´ve edited my question. it´s more a question of understanding as I´m just starting with all this … – motorama Dec 24 '14 at 9:59
  • So you want to use your newly created tiles as basemap to some data you already have (e.g. instead of using google maps or bing or whatever is the current basemap)? – BradHards Dec 24 '14 at 10:04
  • exactly! the current basemap is osm, but I´ve styled it with tilemill and want to use this as basemap. – motorama Dec 24 '14 at 10:41
  • Just keep doing the reprojection on the client. You're already doing this with OSM, so just do it with your tiles instead. – BradHards Dec 24 '14 at 10:53

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