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A contribution towards simplifying area-wide tsetse surveys using medium resolution meteorological satellite data

Published online by Cambridge University Press:  09 March 2007

G. Hendrickx ,
A. Napala ,
J.H.W. Slingenbergh ,
R. De Deken  and
D.J. Rogers
G. Hendrickx
Affiliation:
FAO Trypanosomiasis project GCP-RAF-347-BEL, BP 2034 Bobo Dioulasso, Burkina Faso
A. Napala
Affiliation:
FAO Trypanosomiasis project GCP-RAF-347-BEL, BP 114 Sokodé, Togo
J.H.W. Slingenbergh
Affiliation:
FAO, AGAH, Viale delle Terme di Caracalla, 00100 Rome, Italy
R. De Deken
Affiliation:
ITG/IMT Nationale Straat 155, 2000 Antwerp, Belgium
D.J. Rogers
Affiliation:
Department of Zoology, Oxford University, South Parks Road, Oxford OX1 3PS, UK
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Abstract

A raster or grid-based Geographic Information System with data on tsetse, trypanosomiasis, animal production, agriculture and land use has recently been developed in Togo. The area-wide sampling of tsetse fly, aided by satellite imagery, is the subject of two separate papers. This paper on a first paper, published in this journal, describing the generation of digital tsetse distribution and abundance maps and how these accord with the local climatic and agro-ecological setting. Such maps when combined with data on the disease, the hosts and their owners, should contribute the knowledge of the spatial epidemiology of trypanosomiasis and assist planning of integrated control operations. Here we address the problem of generating tsetse distribution and abundance maps from remotely sensed data, using a restricted amount of field data. Different discriminant models have been applied using contemporary tsetse data and remotely sensed, low resolution data acquired from the National Oceanographic and Atmospheric Administration (NOAA) and Meteosat platforms. The results confirm the potential of satellite data application and multivariate for the prediction of the tsetse distribution and abundance. This opens up new avenues because satellite predictions and field data may be combined to strengthen and/or substitute one another. The analysis shows how the strategic incorporation of satellite imagery may minimize field of data. Field surveys may be modified and conducted in two stages, first concentrating on the expected fly distribution limits and thereafter on fly abundance. The study also shows that when applying satellite data, care should be taken in selecting the optimal number of predictor because this number varies with the amount of training data for predicting abundance and on the homogeneity of the distribution limits for predicting fly presence. Finally, it is suggested that in addition to the use of contemporary training data and predictor variables, training predicted data sets should refer to the same eco-geographic zone.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 91 , Issue 5 , October 2001 , pp. 333 - 346
Copyright
Copyright © Cambridge University Press 2001

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