By Geoffrey H. Dutton
Whilst spatial information is digitized to be used in geographic info platforms and different software program, information regarding its unique scale, answer and accuracy is usually misplaced. hence, utilizing such details at assorted scales and mixing it with facts from different assets might be tough. Mapping vector facts at smaller than the unique scale calls for its generalization, that is frequently dealt with by means of post-processing in ways in which are just weakly supported via databases. The types and strategies defined during this e-book triumph over many such difficulties by way of offering a multi-resolution info illustration that permits retrieval of map information 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)
At every other level one hierarchy or the other would densify, yielding nine triangular facets for every extant one. Location identifiers would be built up using the numerals 1 through 9, rather than 0 through 3 as QTM employs. 3 35 Prior, Related and Derived Work ery point on Earth was part of both hierarchies, either one or an interleaving of both could be used to generate location codes. a. Grid 1 centroids locate Grid 2 vertices c. Oscillation continues... \ \ I I • \ I \ ~y I _ _ _ _\ ,. • \ \ \ I \ b.
Something is missing, something that would make it easier to deal with problems of scale, accuracy and data quality. While a latitude and a longitude can pinpoint where something is on Earth, it can't say how big that thing is or how accurate the estimate of its location may be. Although the precision of such measures may be known to their makers and users, computer software may lose track of positional data accuracy, since all coordinates of a given type tend to be represented to uniform hardware precision (usually 16, 32 or 64 bits).
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. Therefore, should the positional accuracies of two inputs to an overlay operation differ, the accuracy of the result will vary spatially in uncertain, uncontrolled and undocumented ways.
A Hierarchical Coordinate System for Geoprocessing and Cartography (Lecture Notes in Earth Sciences) by Geoffrey H. Dutton