Harold Moellering

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The Commission on Spatial Data Standards of the International Cartographic Association (ICA) is working on defining formal models and technical characteristics of Spatial Data Infrastructures (SDI). To date, this work has been restricted to the Enterprise and Information Viewpoints from the ISO Reference Model for Open Distributed Processing (RM-ODP)(More)
The fractal dimension of a curve is a measure of its geometric complexity and can be any non-integer value between 1 and 2 depending upon the curve's level of complexity. This paper discusses an algorithm, which simulates walking a pair of dividers along a curve, used to calculate the fractal dimensions of curves. It also discusses the choice of chord(More)
In the analogue era, concern for spatial data and its distribution were tasks for mapping organisations earning a reputation for producing quality products based on their spatial characteristics, including their visualisation in printed map form to be used for many different types of problems. In contrast, from the second half of the twentieth century(More)
International Cartographic Association (ICA) is working on defining models of spatial data infrastructures (SDI). SDI models from the enterprise and information viewpoints of the Reference Model for Open Distributed Processing (RM-ODP) have already been presented. Our model from the computational viewpoint identifies the main computational objects of an SDI(More)
Until now the direct stereoscopic display of computer generated cartographic objects produced in real time has been either very expensive or very difficult. This paper presents an approach that is both more efficient than earlier methods and more practical. Several examples of cartographic surfaces will be shown where the stereoscopic vision aspect of the(More)
Past: The field of Analytical Cartography was defined in the late 1960s by Prof. Waldo Tobler. His approach has been to use mathematical and quantitative analysis to solve conceptual cartographic problems. The basic thrust has been to extend the conceptual and theoretical basis of the field. Present: For the last three decades Tobler and his colleagues such(More)
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