On the influence of kriging parameters on the cartographic output—A study in mapping subglacial topography |
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| Authors: | Ute C Herzfeld Mats G Eriksson Per Holmlund |
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| Institution: | 1. Scripps Institution of Oceanography, University of California San Diego, 92093-0205, La Jolla, California
2. Department of Physical Geography, S-10691, Stockholm, Sweden
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| Abstract: | Geostatistics provides a suite of methods, summarized as kriging, to analyze a finite data set to describe a continuous property of the Earth. Kriging methods consist of moving window optimum estimation techniques, which are based on a least-squares principle and use a spatial structure function, usually the variogram. Applications of kriging techniques have become increasingly wide-spread, with ordinary kriging and universal kriging being the most popular ones. The dependence of the final map or model on the input, however, is not generally understood. Herein we demonstrate how changes in the kriging parameters and the neighborhood search affect the cartographic result. Principles are illustrated through a glaciological study. The objective is to map ice thickness and subglacial topography of Storglaciären, Kebnekaise Massif, northern Sweden, from several sets of radio-echo soundings and hot water drillings. New maps are presented. |
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