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 Web Based Resources.

An otm file can be edited using a text editor, take care of its structure.

A Tile Map Service is most likely georeferenced. The used coordinate system must be defined via an associated an [[111: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.

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.

Generic
Generic / custom configuration settings :

• <TileX> : The tile column index.
• <TileY> : The tile row index.
• <Level> : The zoom level (0 means top-level).
• <TileXi> : The tile column index inversed.
• <TileYi> : The tile row index inversed.

Format=Generic
MapUrl=http://tile.openstreetmap.org/<Level>/<TileX>/<TileY>.png
Levels=19

OpenStreetMap
Default configuration settings OpenStreetMap :

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