A Comparison of Indicator and Poisson Kriging of Herbivore Species Abundance in Kruger National Park, South Africa

Ruth Kerry1, Pierre Goovaerts2, Izak Smit3, Benjamin R. Ingram4
1.Department of Geography, Brigham Young University, Provo, USA.
2.Biomedware Inc., Ann Arbor, USA.
3.South African National Parks, Skukuza, South Africa.
4.Department of Computer Science, University of Talca, Talca, Chile.
1. ruth_kerry@byu.edu;2 2.ingrambr@googlemail.com; 3. goovaerts.pierre@gmail.com;4. izaks@sanparks.org

Abstract: This paper investigates the potential of indicator and Poisson kriging for populating gaps in aerial transect surveys of herbivore species abundance in Kruger National Park, South Africa. Indicator kriging does not perform well due to a lack of zero counts in the raw observations and due to poor variogram structure for rare large counts. Two Poisson approaches perform better than indicator kriging. Poisson approach (1), investigating spatial density, performed better than Poisson approach (2) which investigated the proportion each species was of all animals. However, Poisson approach (2) seems promising for mapping abundance of the rarer animals.

Keywords: indicator kriging; Poisson kriging; species abundance

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