Bilinear
bilinear subdivision
shows grid of original elevation data with resolution ~150m

Bicubic
bicubic subdivision

Wavelet noise
bicubic subdivision
homogenous wavelet noise

Slope dependent wavelet noise
bicubic subdivision
slope-dependent wavelet noise

Angle of repose constraint
bicubic subdivision
slope-dependent wavelet noise
angle of repose constraint

Convex boost
bicubic subdivision
slope-dependent wavelet noise
angle of repose constraint
convex curvature boost