I have an application that displays different items on the custom map. The map has a coordinate system which is basically (X,Y) coordinates in centimeters where top-left corner has coordinates(0,0). All items are displayed relatively to this coordinate system.
I want to change the application to use the GeoServer to serve the map. GeoServer uses EPSG as coordinate system (which is not very clear for me at the moment). I don't really care about how my map relates to the world coordinates. What is the better way to show my items on the map served by the GeoServer with a EPSG (maybe custom) defined? Also the distances on the map are quite short, so the coordinates have to be accurate.