I'm a student fairly new to using GIS. I am doing a college project on using ArcGIS to map virtual worlds (such as the continents in World of Warcraft). The game programmers used a custom coordinate system. "Map coordinates are a percentage of the width and height of these images" to quote this site: WoWWiki: Coordinate-safe maps
The maps are all rectangular images with the same proportion ( 1.5:1 ) The in-game distances and geography seem to match the visual appearance of the maps. It's a "flat earth" world rather than a sphere. So there is no visual distortion as there would be on an Earth projection. I want to use a coordinate system that matches the x-y coordinates used by the game and displays correctly on the map image used as a layer - without turning the image from an oblong into a square.
Is there a way to use or make a coordinate system in ArcGIS where the X coordinates are "stretched" relative to the Y ?
Tried to give as much detail as possible. Hope it makes sense.