Predictive mapping of blackberry in the Condamine Catchment using logistic regression and spatial analysis

Apan, Armando and Wells, N. and Reardon-Smith, Kathryn and Richardson, L. and McDougall, Kevin and Basnet, Badri Bahadur (2008) Predictive mapping of blackberry in the Condamine Catchment using logistic regression and spatial analysis. In: Queensland Spatial Conference 2008, 17-19 July 2008, Surfers Paradise, Australia.


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[Abstract]: The development of control strategies for noxious weeds depends on reliable information about the location and extent of weed species. Consequently, there is a need to develop mapping and monitoring techniques that are accurate, costeffective and reliable. This paper investigated predictive modelling and mapping techniques for blackberry (Rubus fruticosus agg.) weed in the Condamine Catchment. In all, 19 bio-physical factors were assessed, of which a subset was analysed by logistic regression using SPSS. The model calculated the probability of a binary dependent variable (i.e. “presence of weed” vs. “absence of weed”) in response to the above independent (bio-physical) variables.

The output model was brought into ArcGIS’s Spatial Analyst to produce the predictive map. The factors found to be significant in the model were a) distance from stream, b) foliage projective cover, c) elevation, and d) distance from NSW border. The use of logistic regression generated maps depicting the probability of blackberry occurrence with a model accuracy of greater than 90%. The predicted maps offer relevant information that could be useful to land planners and decision-makers on where to target or prioritise weed control strategies, or for other aspects of weed management.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: This work is licensed under a Creative Commons Attribution-Share Alike 2.5 Australia license.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Surveying and Land Information
Date Deposited: 12 Jan 2009 03:01
Last Modified: 22 Aug 2014 01:43
Uncontrolled Keywords: weed, blackberry, GIS, predictive mapping
Fields of Research : 09 Engineering > 0909 Geomatic Engineering > 090903 Geospatial Information Systems

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