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Innovations In GIS by Zarine Kemp

By Zarine Kemp

Derived from displays made on the fourth annual united kingdom nationwide convention on GIS examine, this paintings contains contributions by way of prime specialists in: geography, arithmetic, computing technology, surveying, archaeology, making plans and drugs.

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The history of digital terrain modelling significantly predates that of GIS, yet the range of models available to the GIS user is still very limited. Digital terrain modelling developed from the attempts of researchers working in such disciplines as photogrammetry, surveying, cartography, civil and mining engineering, geology, geography and hydrology. The uncoordinated and independent nature of these applications led to the development of a variety of data models, many of which have not been fully exploited in today’s GIS.

1993) Assessing interpolation accuracy in elevation models, IEEE Computer Graphics & Applications, 13(2), 48–56. 1 INTRODUCTION The history of GIS architectures is closely bound up with the development of modern database systems. The distinctive requirements of spatial data management for GIS and CAD have provided a major driving force in extending the range of applications supported by general purpose database systems. , 1993). , 1994). Although many prototype temporal database systems have been developed (Böhlen, 1995), most current GIS and database products remain snapshot-oriented systems capable only of static representations of data.

8 Isometric projections of original 51×51 DEM surface and polynomial representations of degree 0 to 10. the extra storage costs do not appear to be worth the rather small reductions in elevation error. Polynomials of fixed degree cannot guarantee a satisfactory goodness of fit throughout the whole model, since elevation error is not constrained. Although our surface patch quadtree DTM overcomes this problem by varying the size of the surface patches, an alternative data structure termed the adaptive polynomial surface patch DTM was devised which varies the order of the approximating polynomial while keeping the patch size constant.

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