Abstract

AbstractCurrently many European nations are taking part in a coordinated exercise on mapping critical loads of air pollutants for aquatic and terrestrial ecosystems. A statistically based lake survey and soil analyses from sites uniformly covering the country are used to assess the critical loads of sulphur and nitrogen for lakes and forest soils in Finland. When presenting results based on such large and spatially extensive data sets one has to take into account the user of this information. For the scientific community it is desirable to retain as much information as possible in the display of the results, whereas clarity and simplicity of presentation are crucial for the understanding and acceptance by policy‐makers. In this paper we present different methods for displaying spatially varying information, discuss various statistical descriptors for characterizing distributions by a few numbers, and compare the influence of alternative ways of aggregating data on the final display of results.

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