@conference {13310,
	title = {Multi-resolution out-of-core modeling of terrain and geological data},
	booktitle = {Proceedings of the 13th annual ACM international workshop on Geographic information systems},
	series = {GIS {\textquoteright}05},
	year = {2005},
	month = {2005///},
	pages = {143 - 152},
	publisher = {ACM},
	organization = {ACM},
	address = {New York, NY, USA},
	abstract = {Multi-resolution is a useful tool for managing the complexity of huge terrain and geological data sets. Since encoding large data sets may easily exceed main memory capabilities, data structures and algorithms capable of efficiently working in external memory are needed. In our work, we aim at developing an out-of-core multi-resolution model dimension-independent, that can be used for both terrains, represented by Triangulated Irregular Networks(TINs), and 3D data, such as geological data, represented by tetrahedral meshes. We have based our approach on a general multi-resolution model, that we have proposed in our previous work, which supports the extraction of variable-resolution representations. As first step, we have developed, in a prototype simulation system, a large number of clustering techniques for the modifications in a multi-resolution model. Here, we describe such techniques, and analyze and evaluate them experimentally. The result of this investigation has led us to select a specific clustering approach as the basis for an efficient out-of-core data structure.},
	keywords = {Multi-resolution, out-of-core, terrain models},
	isbn = {1-59593-146-5},
	doi = {10.1145/1097064.1097085},
	url = {http://doi.acm.org/10.1145/1097064.1097085},
	author = {Danovaro,Emanuele and De Floriani, Leila and Puppo,Enrico and Samet, Hanan}
}
@article {13267,
	title = {A multi-resolution topological representation for non-manifold meshes},
	journal = {Computer-Aided Design},
	volume = {36},
	year = {2004},
	month = {2004/02//},
	pages = {141 - 159},
	abstract = {We address the problem of representing and processing 3D objects, described through simplicial meshes, which consist of parts of mixed dimensions, and with a non-manifold topology, at different levels of detail. First, we describe a multi-resolution model, that we call a non-manifold multi-tessellation (NMT), and we consider the selective refinement query, which is at the heart of several analysis operations on multi-resolution meshes. Next, we focus on a specific instance of a NMT, generated by simplifying simplicial meshes based on vertex-pair contraction, and we describe a compact data structure for encoding such a model. We also propose a new data structure for two-dimensional simplicial meshes, capable of representing both connectivity and adjacency information with a small memory overhead, which is used to describe the mesh extracted from an NMT through selective refinement. Finally, we present algorithms to efficiently perform updates on such a data structure.},
	keywords = {Data structures, Multi-resolution, Non-manifold modeling},
	isbn = {0010-4485},
	doi = {10.1016/S0010-4485(03)00058-7},
	url = {http://www.sciencedirect.com/science/article/pii/S0010448503000587},
	author = {De Floriani, Leila and Magillo,Paola and Puppo,Enrico and Sobrero,Davide}
}
@conference {13306,
	title = {Morphology-driven simplification and multiresolution modeling of terrains},
	booktitle = {Proceedings of the 11th ACM international symposium on Advances in geographic information systems},
	series = {GIS {\textquoteright}03},
	year = {2003},
	month = {2003///},
	pages = {63 - 70},
	publisher = {ACM},
	organization = {ACM},
	address = {New York, NY, USA},
	abstract = {We propose a technique for simplification and multiresolution modeling of a terrain represented as a TIN. Our goal is to maintain the morphological structure of the terrain in the resulting multiresolution model. To this aim, we extend Morse theory, developed for continuous and differentiable functions, to the case of piecewise linear functions. We decompose a TIN into areas with uniform morphological properties (such as valleys, basins, etc.) separated by a network of critical lines and points. We describe an algorithm to compute the above decomposition and the critical net, and a TIN simplification algorithm that preserves them. On this basis, we build a multiresolution terrain model, which provides a representation of critical features at any level of detail.},
	keywords = {morphological structure, Multi-resolution, terrain models},
	isbn = {1-58113-730-3},
	doi = {10.1145/956676.956685},
	url = {http://doi.acm.org/10.1145/956676.956685},
	author = {Danovaro,Emanuele and De Floriani, Leila and Magillo,Paola and Mesmoudi,Mohammed Mostefa and Puppo,Enrico}
}
@conference {13321,
	title = {Regular and irregular multi-resolution terrain models: a comparison},
	booktitle = {Proceedings of the 10th ACM international symposium on Advances in geographic information systems},
	series = {GIS {\textquoteright}02},
	year = {2002},
	month = {2002///},
	pages = {143 - 148},
	publisher = {ACM},
	organization = {ACM},
	address = {New York, NY, USA},
	abstract = {The paper deals with the problem of modeling large-size terrain data sets. To this aim, we consider multi-resolution models based on triangle meshes. We analyze and compare two multi-resolution terrain models based on regular and irregular meshes. The two models are viewed as instances of a common multi-resolution model, that we call a multi-resolution triangle mesh. Our comparison takes into account the space requirements of the data structures implementing the two models as well their effectiveness in supporting the extraction of variable-resolution terrain representations.},
	keywords = {Multi-resolution, regular and irregular structures, terrain models},
	isbn = {1-58113-591-2},
	doi = {10.1145/585147.585178},
	url = {http://doi.acm.org/10.1145/585147.585178},
	author = {De Floriani, Leila and Magillo,Paola}
}
