1. A method for generating a computer model to display a position of a person in a defined location, comprising: selecting a substantially overhead image of a defined location having spatial coordinates; marking a perimeter of the defined location using a graphical user interface; relating the marked perimeter to the spatial coordinates of the defined location; inputting a number of levels of the defined location using the graphical user interface; generating a computer model of the defined location based on the marked perimeter and the input number of levels; determining spatial coordinates of the person; and displaying the position of the person relative to the computer model of the defined location based on the spatial coordinates of the person relative to the spatial coordinates of the defined location.