COMPARISON OF BILINEAR AND BROWNIAN INTERPOLATION FOR DIGITAL ELEVATION MODELS

Bilinear interpolation is compared with Brownian interpolation for DEM s (Digital Elevation Models). Brownian interpolation is an adaptation of the ''Random Midpoint Displacement'' algorithm, taking into account the non-stationarity and the non-self-affinity of the topographic sur face. The comparison of these two techniques is carried out according to different quality criteria: the bias, standard deviation and maximu m deviation on the one hand, fractal dimension and texture on the othe r hand. The fidelity to the hydrographic patterns is also considered, as well as the tendency after multiple iterations of the interpolation . The comparison shows that the different quality requirements may be incompatible.