THREE-DIMENSIONAL DIGITAL MAP FORMING DEVICE AND STORAGE MEDIUM STORING THREE-DIMENSIONAL DIGITAL MAP FORMING PROGRAM

PROBLEM TO BE SOLVED: To provide a device using on-aircraft type LRF data for automatically performing area recognition of a two-dimensional digital map to accurately and efficiently turning a building, a road, and the ground in the existing two-dimensional digital map into three-dimensional ones. SOLUTION: A three-dimensional digital map forming device is provided with a road modeling process 3, a building modeling process 4, and a ground modeling process 5, and the road modeling process 3 forms a road area from a road edge described as a polyline in an existing digital map 1. After a road centerline is found in the formed road area, height information is added in sequence from the road centerline to the road overall area. In the building modeling process 4, the most frequent value of the LRF data within a building outline is set to be a roof height while a minimum value of the LRF data located in the outside of the building outline and within a fixed distance from the building outline is set to be a ground height of the building. In the ground modeling process 5, the ground is modeled by aiming at the vicinity of the building or the road and a flat open space.