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2) for each file, you will associate a xxx.hhh calibration file (same prefix name but .hhh extension). 
These calibration files will contain the WCS header (*)

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4) your HiPS will be generated in yourFolderHiPS directory that you can load directly in Aladin, 
and/or publish on your apache HTTP server.
With this method, your will be able to create and publish deep HiPS (at any resolution) rather that 
just a low resolution planet map.
Notice that you can already display your HiPS in various projections (SINUS, AITOFF, MOLLWEIDE, AITOFF, CAR, ...)
via the Propertie button in Aladin.
I will keep you inform of our progress in the Aladin code (inversion of longitude, ellipsoide projection...). 
Do not hesitate to signal the various problem that you see
(*) The WCS header is presently sky oriented and you will have to adapt WCS to your image collection. 
For instance, if you take this unique image http://i.stack.imgur.com/ojwD8.jpg (the earth in cartesian projection),
you may use this following calibration file ojwD8.hhh:

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