Thread:Fandyllic/@comment-27075564-20170724155029/@comment-1077307-20171025035552

http://vignette.wikia.nocookie.net/central/images/0/0b/Witcher-Map_Module-Lightbox_Image_Aribtrarty_Map_Coordiate_Extents_-_No_more_0-100_only.png/revision/latest/scale-to-width-down/900

Note the coords in the upper left corner, the ones you see when you hover the mouse over the map. Non 100% style coords. Then can be set per map. In this case the mouse cursor was lower-right on the map when the screenshot was made. This allows you to define an arbitrary coordinate system that fits the users needs.

This is necessary for maps that have existing well known coordinates and necessary for allowing maps to be cut-up or used which don't fit perfect 0-100. To use existing Witcher data for example there's no 0 - 100. The coords can also be negative, like is needed for Witcher maps.

The coord extents can be placed manually at the map call, as below, or automatic when defined with the Map/File image to zone definitions, or defined automatically using the CommonData database.