Search

Real-world phenomena have traditionally been modelled in a GIS in two and three dimensions. However, powerful insights can be gained by the integration of additional non-spatial dimensions, such as time and scale, in a higher dimensional spatial model. While this theory is conceptually sound, there is a lack of understanding of its consequences when applied to real world geographic information. In this paper we therefore analyse these consequences, as well as the techniques that are necessary in order to extract meaningful 2D/3D information from it, which can be used with existing algorithms and software., OTB Research, OTB Research Institute for the Built Environment

Real-world phenomena have traditionally been modelled in a GIS in two and three dimensions. However, powerful insights can be gained by the integration of additional non-spatial dimensions, such as time and scale, in a higher dimensional spatial model. While this theory is conceptually sound, there is a lack of understanding of its consequences when applied to real world geographic information. In this paper we therefore analyse these consequences, as well as the techniques that are necessary in order to extract meaningful 2D/3D information from it, which can be used with existing algorithms and software., OTB Research, OTB Research Institute for the Built Environment

Although the validation of single polygons has received considerable attention, the automatic repair of invalid polygons has not. Automated repair methods can be considered as interpreting ambiguous or ill-defined polygons and giving a coherent and clearly defined output. At this moment, automatic tools are not satisfactory and repairing is thus mostly a semi-automatic task. We present in this paper a novel method, based on a constrained triangulation, to automatically repair invalid polygons. We describe our method, highlight some implementation details and describe an experiment with highly degenerate input for which predictable output is obtained. We believe our approach is superior to other tools since it is simple, intuitive and scales to big polygons., OTB Research, OTB Research Institute for the Built Environment

Although the validation of single polygons has received considerable attention, the automatic repair of invalid polygons has not. Automated repair methods can be considered as interpreting ambiguous or ill-defined polygons and giving a coherent and clearly defined output. At this moment, automatic tools are not satisfactory and repairing is thus mostly a semi-automatic task. We present in this paper a novel method, based on a constrained triangulation, to automatically repair invalid polygons. We describe our method, highlight some implementation details and describe an experiment with highly degenerate input for which predictable output is obtained. We believe our approach is superior to other tools since it is simple, intuitive and scales to big polygons., OTB Research, OTB Research Institute for the Built Environment