Terrain representation

a function that maps location (x,y) to elevation (z) over a domain D

polygons with attributes

cells with attributes

grid with attributes plus interpolator

bilinear interpolator

triangular mesh with point attributes plus interpolator

linear interpolator

quintic interpolator

polylines (isolines) with attributes plus interpolator

CTOG and variants

others?

FEM

splines

spectral

wavelet

hydrological

morphological

multiple

continuity

extrema

invertibility

topological networks

differentiability

gradients

fractal properties

aggregation

RMSE

spatial dependence

error propagation