This paper presents a basic principle of making network processing, following the trail of isoline, and smoothing curves by near-point average weighting method.

Gridding of irregular data is a basic problem in the processing and interpretation of geophysical data, and is also an indispensable means to assure the success of geophysical data processing methods.

ROAM method adopts split and merge operations to adjust triangle meshes, can interactively perform view-dependent, locally-adaptive terrain meshing and can construct multiresolution terrain model.