What phenomenology can be demonstrated using moving geometry?
Since the DIRSIG model now knows the geometry’s position as a function of time, the thermal calculations can properly show thermal scarring effects for moving objects. A tank which departed five minutes prior to scene imaging time might, for instance, leave a visible thermal shadow on the asphalt where it was parked for two hours prior. Using moving geometry also makes it easy to demonstrate effects such as motion blur. In conjunction with the Task Manager functionality of DIRSIG4, it is simple to specify that a scene be captured 3 times per second for a duration of 2 seconds. Using a post-processing tool such as ENVI (with its “Band Math” feature), the generated frames can integrated to demonstrate blurred motion. Note that this was also possible using prior versions of DIRSIG, but would require positioning changes in the ODB for a series of individual runs.
