openlayers - Which is the correct SRS to cut a map? -

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i have used maptiler cut image, steps:

  1. choose "google maps comatible(spherical mercator)".
  2. add image.
  3. choose "wgs84-latitude , longitude(geodetic)".
  4. set min zoom 0,and max zoom 4.

then got 5 folders named "0","1","2","3" , "4".

i used openlayers.layer.xyz show map,but got upper , lower dislocation. wrong?

i use "epsg:900913" srs whenever dealing google maps.


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