Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 510017
Title Grid-spacing and the quality of abundance maps for species that show spatial autocorrelation and zero-inflation
Author(s) Lyashevska, Olga; Brus, Dick J.; Meer, Jaap van der
Source Spatial Statistics 18 (2016). - ISSN 2211-6753 - p. 386 - 395.
Department(s) Alterra - Soil, water and land use
Publication type Refereed Article in a scientific journal
Publication year 2016
Keyword(s) Autocorrelation - Count data - Generalized linear geostatistical modelling - Grid-spacing - Zero-inflation

The effect of grid-spacing on the quality of species abundance maps is explored for species that show zero-inflation and spatial autocorrelation. Using a zero-inflated Poisson mixture model multiple fields of the prevalence parameter π and the intensity parameter μ were simulated. A selected field was sampled by grid-sampling with 200, 400, 800, 1600, and 3200 m grid-spacing and used to predict at a fixed set of validation locations by simple kriging with an external drift. The external drift variables were silt, silt squared and altitude. The estimated sampling distribution of MSE against grid-spacing shows that beyond a spacing of 1600 m the mean of MSE increases at a much faster rate. Based on these findings the 1600 m grid which consists of 446 locations for our study area of 2400 km2 gives a compromise between sampling costs and prediction accuracy.

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