A review of spatio-temporal modelling of quadrat count data with application to striga occurrence in a pearl millet field

Dale Hess*, Marie Colette van Lieshout, Bill Payne, A. Stein

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)

Abstract

This paper describes how spatial statistical techniques may be used to analyse weed occurrence in tropical fields. Quadrat counts of weed numbers are available over a series of years, as well as data on explanatory variables, and the aim is to smooth the data and assess spatial and temporal trends. We review a range of models for correlated count data. As an illustration, we consider data on striga infestation of a 60 × 24 m2 millet field in Niger collected from 1985 until 1991, modelled by independent Poisson counts and a prior auto regression term enforcing spatial coherence. The smoothed fields show the presence of a seed bank, the estimated model parameters indicate a decay in the striga numbers over time, as well as a clear correlation with the amount of rainfall in 15 consecutive days following the sowing date. Such results could contribute to precision agriculture as a guide to more cost-effective striga control strategies.

Original languageEnglish
Pages (from-to)133-138
Number of pages6
JournalInternational Journal of Applied Earth Observation and Geoinformation
Volume3
Issue number2
DOIs
Publication statusPublished - 2001
Externally publishedYes

Keywords

  • Quadrat counts
  • Spatial statistics
  • Striga
  • ITC-ISI-JOURNAL-ARTICLE

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