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Leila De Floriani, "A Pyramidal Data Structure for TriangleBased Surface Description," IEEE Computer Graphics and Applications, vol. 9, no. 2, pp. 6778, March/April, 1989.  
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@article{ 10.1109/38.19053, author = {Leila De Floriani}, title = {A Pyramidal Data Structure for TriangleBased Surface Description}, journal ={IEEE Computer Graphics and Applications}, volume = {9}, number = {2}, issn = {02721716}, year = {1989}, pages = {6778}, doi = {http://doi.ieeecomputersociety.org/10.1109/38.19053}, publisher = {IEEE Computer Society}, address = {Los Alamitos, CA, USA}, }  
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TY  MGZN JO  IEEE Computer Graphics and Applications TI  A Pyramidal Data Structure for TriangleBased Surface Description IS  2 SN  02721716 SP67 EP78 EPD  6778 A1  Leila De Floriani, PY  1989 VL  9 JA  IEEE Computer Graphics and Applications ER   
A hierarchical model for approximating 21/2dimensional surfaces is described. This model, called a Delaunay pyramid, is a method for compression of spatial data and representation of a surface at successively finer levels of detail. A Delaunay pyramid is based on a sequence of Delaunay triangulations of suitably defined subsets of the set of data points. A triangleoriented encoding structure for a Delaunay pyramid is presented, and its storage complexity is evaluated. An algorithm for constructing a Delaunay pyramid is described, and a method for solving the point location and evaluation on such a model is discussed.
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