Morphologic Fidelity of Grid Digital Elevation Model

Many factors cause incorrect terrain modeling.The vital reason is the ambiguity of DEM quality concept.It causes the faulty for DEM accuracy assessment and the imprecise altitude interpolate model.Hence,perfecting fundamental theory of digital tertian modeling,improving on DEM processing technology and optimization of DEM data structure are key problems of high fidelity DEM establishment.An important basis is provided for high fidelity DEM establishment.