Data structures to support the rapid display of both regularly spaced and irregularly spaced digital terrain have been designed and implemented. Very large numbers of data points are handled rapidly by dynamically varying the resolution of the display. Gaze-directed viewing is used by forcing the highest resolution to be maintained where the view line intersects the data. The resolution is decreased gradually along the image as the distance from the intersection point increases. The high resolution part of the image can be moved in response to a change in the gaze direction. Using a Silicon Graphics IRIS 4D/85GT, an update speed of 10Hz was achieved for regularly spaced data of size 800 by 650. For an irregularly spaced data set with 119845 points, an update speed of 5 Hz was achieved using 7 different resolution levels.
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