抄録
A Stereoscopic image viewing the Mt. Fuji and the surroundings was produced by combining Landsat TM data and the corresponding digital terrain model (DTM). The DTM consists of elevations read out at every intersections of grid divided into 150 along longitude direction of a 1 : 25, 000 topographical map and also into 120 along latitude one. Elevation corresponding to each pixel of TM data was interpolated by bi-linear method.
Three cases of stereoscopic image were made; one from vertical direction, one from oblique direction, and the other from horizontal direction. Stereoscopic. image from vertical direction has different characteristics for human eyes according to the different base height ratio.
In the case of Mt. Fuji viewed from an altitude of 160 km with a base length of 40 km, the terrain feature looks like natural. This case is equivalent to base height ratio of 0.25 when an object is seen from a distance of 25 cm, i.e., the distance of distinct vision. On the contrary, when it is viewed from an altitude of 50 km with the same base lengh of 40 km, the topography is emphasized. This stereo pair may be useful to detect the change of slope and also the small terrain feature.
Oblique stereoscopy gives a panorama which feels more comfortable for us, probably because we are familliar with such slant vision as seen from the top of mountains. Horizontal stereoscopy gives a kind of different feeling in our terrain recognition, as it were viewed on the surface of the other planet in some space fictions, because we have no experiences to see the land surface in such clear atmosphere.
