Simultaneous Graphic Generalization of Vector Data Sets Export

@article{citeulike:3844951, abstract = {Manual cartographic generalization is a simultaneous process. However, most automatic approaches so far have been sequential; generalization operators are applied one at a time in a certain order. This has been the case both for model generalization (generalization of the conceptual model) and graphic generalization. Our research seeks to demonstrate that the graphic part of cartographic generalization can be formulated as an optimization problem and accordingly be solved in a single step. This paper deals with several issues regarding this optimization approach. Firstly, a set of appropriate analytical constraints for the generalization process is given, as well as rules for when to apply these constraints. In our approach, we are limited to formulating these constraints on point locations. Secondly, least-squares adjustment is proposed to find the optimal solution according to the constraints. Finally, the conjugate-gradients method is recommended for solving the normal equations. A prototype system for simultaneous graphic generalization has been implemented in C++, which communicates with a commercial map production system. Results from three tests of the prototype system are included in the paper.}, address = {Hingham, MA, USA}, author = {Harrie, Lars and Sarjakoski, Tapani}, citeulike-article-id = {3844951}, citeulike-linkout-0 = {http://portal.acm.org/citation.cfm?id=594735.594841}, citeulike-linkout-1 = {http://dx.doi.org/10.1023/A:1019765902987}, doi = {10.1023/A:1019765902987}, issn = {1384-6175}, journal = {Geoinformatica}, keywords = {constraint, deformation, generalisation, least-square, orchestration}, number = {3}, pages = {233--261}, posted-at = {2009-01-03 20:22:05}, priority = {0}, publisher = {Kluwer Academic Publishers}, title = {Simultaneous Graphic Generalization of Vector Data Sets}, url = {http://dx.doi.org/10.1023/A:1019765902987}, volume = {6}, year = {2002} }

TY - JOUR ID - citeulike:3844951 L3 - citeulike-article-id:3844951 N2 - Manual cartographic generalization is a simultaneous process. However, most automatic approaches so far have been sequential; generalization operators are applied one at a time in a certain order. This has been the case both for model generalization (generalization of the conceptual model) and graphic generalization. Our research seeks to demonstrate that the graphic part of cartographic generalization can be formulated as an optimization problem and accordingly be solved in a single step. This paper deals with several issues regarding this optimization approach. Firstly, a set of appropriate analytical constraints for the generalization process is given, as well as rules for when to apply these constraints. In our approach, we are limited to formulating these constraints on point locations. Secondly, least-squares adjustment is proposed to find the optimal solution according to the constraints. Finally, the conjugate-gradients method is recommended for solving the normal equations. A prototype system for simultaneous graphic generalization has been implemented in C++, which communicates with a commercial map production system. Results from three tests of the prototype system are included in the paper. IS - 3 JF - Geoinformatica SN - 1384-6175 AD - Hingham, MA, USA EP - 261 TI - Simultaneous Graphic Generalization of Vector Data Sets PB - Kluwer Academic Publishers VL - 6 SP - 233 KW - constraint KW - deformation KW - generalisation KW - least-square KW - orchestration AU - Harrie, Lars AU - Sarjakoski, Tapani PY - 2002/// UR - http://dx.doi.org/10.1023/A:1019765902987 ER -