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====== Orbit Tile Map Service File ====== An Orbit Tile Map Service reference file (*.otm) is Orbit's Tile Map Service resource connection file. \\ An otm file is a file based connection to a Tile Map Service. It makes it possible to work with TMS resource in the same way as file based resources. It is strongly advised to read the documentation about [[110:technologies:resources:web|]]. ===== Structure ===== An otm file can be edited using a text editor, take care of its structure. ===== Georeference ===== A Tile Map Service is most likely georeferenced. The used coordinate system must be defined via an associated an [[technologies:basic_concepts:ord|ord file], just like other vector and image resources. The CRS for OpenStreetMap is "WGS 84 / World Mercator" EPSG 3395. \\ If the tile service is using another coordinate system, you can define custom georeference transformation for the top tile, using a .geo file. ===== Some background ===== The Orbit Tile Map Service driver relies on a tile engine, a computer graphics technique which generates a larger graphic from re-using a number of smaller graphics to minimize data traffic and increase real-time rendering performance. Tiled maps are composed of a set of scale-appropriate cartographic renderings, each divided up into regularly spaced image tiles, called Tilesets. ===== Examples ===== **Generic** \\ Generic / custom configuration settings : * : The tile column index. * : The tile row index. * : The zoom level (0 means top-level). * : The tile column index inversed. * : The tile row index inversed.


Format=Generic
MapUrl=http://tile.openstreetmap.org///.png
Levels=19

** OpenStreetMap** \\ Default configuration settings OpenStreetMap :


Format=OpenStreetMap
MapUrl=http://tile.openstreetmap.org
Levels=19