Abstract: A simulation method and system is provided for simulating a terrain and the objects above the terrain to a viewer. The method includes the steps of providing a first data base which includes a digital representation of the terrain and a second data base which includes a digital representation of the objects located above the terrain. The method also includes the steps of generating individual images, each of which simulates a viewing volume of the terrain and the objects and finally repeating the step of generating, thereby producing a plurality of images simulating a plurality of viewing volumes. The step of generating includes independently producing first and second images from information stored in separate first and second data bases, respectively, merging the first image and the second image, thereby forming an image simulating a viewing volume and displaying the image simulating the viewing volume.