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<body class='hmmessage'><div style="text-align: left;">Hi all<br><br>I have a big image, represented by many tiles in different zoom levels. I have them<br>stored locally in following (OSGEO recommended) structure:<br><br>../<zoom_level>/<x-coordinate>/<y-coordinate>.jpg<br><br>I managed to somehow to display them in OpenLayers, however, I still have little<br>bit a mess with resolutions and zoom levels. ;-)<br><br>Question: <br>1) Is there a recommended projection for plain, tiled images (if ignoring DPI, there is no<br>actual unit, simple pixels)? I see people using mercator projections (EPSG:410001,<br>EPSG:27700, EPSG:3005, EPSG: 900913,...) but I can't tell which one is <br>appropriate for me. Does this matter at all for my simple case?<br><br>2) My highest zoomlevel/resolution contains one tile which represents the complete, full <br>image and currently is located at .../<highest-zoom-level>/0/0.jpg.<br>I realized that some projections have for the highest resolution two tiles (e.g. EPSG:4326),<br>other one, as I have (OSGEO:41001. With my limited knowledge, this seems to me<br>a bit confusing. Especially in respect the the overview-map feature of OpenLayers,<br>do I have to consider this for the selection of the projection or is this all simply a question<br>of configuration of OpenLayers?<br><br>3) I think, the origin for a layer can be set. As my coordinates may also be negative <br>(the origin of the displayed image is in the middle of the picture), can this simply be<br>configured or do I have to shift the coordinates with some TileProvider so (0,0)<br>comes to the left bottom corner of the OpenLayers coordinate system.<br><br>I hope I don't annoy people with my (may be stupid) beginner questions,<br>but I am very grateful for any tips, comments or examples!<br><br>Petra<br><br><br></div><br /><hr />Die neue Generation der Windows Live Services - jetzt downloaden! <a href='http://get.live.com/' target='_new'>Hier klicken!</a></body>
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