抄録
In this paper we discuss performances of various interpolation methods used to generate a precise digital elevation model (DEM). Generally, the interpolation methods are classified into the following three types: type 1 generates a DEM from contour lines; type 2 does from knots of latticed meshes, and type 3 does from sparse points. Here, we examined type1 and type 2. The methods of type 1 that we examined are Akima's interpolation, cubic spline interpolation, cubic surface interpolation, morphological interpolation and Inaba's interpolation. Also, the methods of type 2 we did are linear interpolation, Akima's interpolation, cubic spline interpolation, bicubic spline interpolation and FFT interpolation. Using artificial and real topographic data, we evaluated these methods systematically and made their performances of interpolation accuracy clear. We concluded that morphological interpolation and Akima's interpolation method are relatively effective in type 1, and that cubic spline interpolation and Akima's interpolation method are effective in type 2.
