Fig 1.
Topographic map of sample area and distorted DEM.
(A) Topographic map of reservoir. (B) Grid DEM. (C) DEM elevation data.
Fig 2.
Analysis of terrain surface features that tend to generate DEM distortions.
Table 1.
Formulization of the terrain semanteme.
Fig 3.
Three typical semantic region structures.
(A) Atomic semanteme. (B) Combination semanteme. (C) Semanteme with a center line.
Fig 4.
S-DEM production flow.
Fig 5.
Geometrical structure of vertical plane.
(A) Cliff structure. (B) Feature-line direction in TIN.
Fig 6.
Vertical plane of Fig 5 as represented by prototype system.
(A) TIN. (B) Grid DEM. (C) S-DEM of vertical surface.
Fig 7.
Experimental results showing DEM recovery reliability and accuracy for four sample regions.
(A) Angle between recovered plane and horizontal (rad). (B) RMSEs of elevation before and after recovery (m).