By Geoffrey H. Dutton
While spatial facts is digitized to be used in geographic info structures and different software program, information regarding its unique scale, answer and accuracy is usually misplaced. hence, utilizing such details at diversified scales and mixing it with information from different resources can be tricky. Mapping vector information at smaller than the unique scale calls for its generalization, that's often dealt with by means of post-processing in ways in which are just weakly supported through databases. The types and strategies defined during this e-book triumph over many such difficulties through supplying a multi-resolution information illustration that permits retrieval of map facts at a hierarchy of scales, in addition to documenting the accuracy of each spatial coordinate.
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Extra resources for A Hierarchical Coordinate System for Geoprocessing and Cartography (Lecture Notes in Earth Sciences)
2 2 Historical and Conceptual Background Global Environmental Monitoring Until quite recently, polyhedral maps received little attention in professional cartographic circles, and even less in the GIS arena. However, a small amount of more serious interest has been evident in the literature of ecology and geosciences, in which the need for global sampling of environmental data periodically arises. The earliest digital implementation using polyhedra seems to be the one reported in Wickman et al (1974).
Also discussed are assessing and conditioning line data and approaches to identifying conflicts among map features due to scale change. Details of an operational data model are presented, followed by those of a line simplification algorithm for hierarchical coordinates and the control parameters it uses. The chapter closes with an explanation of the generation and handling of point-specific attributes (metadata), showing how they are used to guide point selection for line generalization. Chapter 5 describes how generalization methods presented in chapter 4 were implemented, and along with appendices C and D, presents results of generalization experiments using two shoreline datasets.
While this thesis is not directly concerned with overlay techniques, it is important to understand their implications for data quality management. Whenever spatial data from different sources are integrated, the lineage of the result becomes heterogeneous. Map overlay works at such a fine-grained scale that many individual features in the resultant layer contain data from two sources (or even more if overlays are cascaded). attributes and metadata for the resultant layer can indicate what sources formed it, and carry over descriptions of their quality, but they cannot easily indicate which portions of particular features came from what source.
A Hierarchical Coordinate System for Geoprocessing and Cartography (Lecture Notes in Earth Sciences) by Geoffrey H. Dutton