There is provided a computer-implemented coordinate conversion method for converting a first map of assets represented by first map coordinates based on a first projection system to a second map of assets represented by second map coordinates based on a second projection system, the method comprising obtaining transformation coefficients comprising first directional coefficients and rotation coefficients; converting the rotation coefficients into second directional coefficients; generating simplified transformation coefficients by adding the first and second directional coefficients and eliminating the rotation coefficients; generating the second map coordinates by converting the first map coordinates using the simplified transformation coefficients without any use of rotation coefficients; generating the second map of assets based on the second projection system using the second map coordinates; and providing user access to the generated map. There is also provided a system/computing device for doing the same.