1. A computer-implemented method for generating a computer model to display a position of a person in a defined location, comprising: selecting a substantially overhead satellite or aerial image of the defined location having spatial coordinates, the defined location being a physical, geographic location having existing dimensions; marking a perimeter outline of a building at the defined location using a processor and a graphical user interface, marking the perimeter outline including selecting corners of the building on the satellite or aerial image with perimeter lines extending between the corners; relating the marked perimeter to the spatial coordinates of the defined location, using the processor, by identifying spatial coordinates for portions of the satellite or aerial image corresponding to the corners and defining spatial coordinates of the corners to correspond with the spatial coordinates for the portions of the satellite or aerial image corresponding to the corners; inputting a number of levels of the building at the defined location using the graphical user interface; generating a computer model of the building at the defined location using the processor, wherein generating the computer model of the building includes generating a shape of the computer model of the building corresponding to the perimeter outline, and wherein generating the computer model of the building includes generating a number of levels of the computer model corresponding to the number of levels of the building; determining spatial coordinates of the person using the processor; and displaying the position of the person relative to the computer model of the building at the defined location based on the spatial coordinates of the person relative to the spatial coordinates of the defined location.