Please use this identifier to cite or link to this item: http://hdl.handle.net/10174/7405

Title: Redistributing Agricultural Data by a Dasymetric Mapping Methodology
Authors: Martins, Maria Belém
Xavier, António
Fragoso, Rui
Keywords: dasymetric mapping
agricultural data
spatial disaggregation
iterative process
Alentejo
Issue Date: 2012
Publisher: Northeastern Agricultural and Resource Economics Association
Citation: Martins, M.B., A.M. Xavier, R. Fragoso (2012), “Redistributing soil occupation data by a dasymetric mapping methodology", Agricultural and Resource Economics Review, 41/3 (December 2012): 351–366.
Abstract: This paper examines the adaptation of dasymetric mapping methodologies to agricultural data, including their testing and transposition, in order to recover the underlying statistical surface (i.e., an approximation of the real distribution of data). A methodology based on the ideas of Gallego and Peedell (2001) and on the binary method is proposed. It has several steps: (i) the exclusion of target zones for which no observations exist (binary method), (ii) the application of an iterative process to define the most precise densities for data distribution, and (iii) the stratification/definition of sub-units with homogenous characteristics if the results of the previous step are not satisfactory, and the subsequent application of step two. The methodology was applied in the Alentejo region of Portugal, using data from the 1999 Agricultural Census. Several counties are used as source zones. The aim was to generate a distribution of agro-forestry occupations as close as possible to reality. Two lines of analysis were followed: (i) application of the methodology simultaneously to all counties (definition of regional densities), and (ii) application of the methodology separately to the different subareas with similar characteristics (definition of sub-regional densities). For an easy application of the methodology, a computer tool was created, which allowed the easy optimization, validation, and exportation of the data into a Geographic Information System (GIS). The results were validated using several error indicators at the county level, as well as in a sample of parishes. We show that the second variant of the methodology yielded more precise results, and is superior for the types of data available. This method yielded maps in which the distribution of the most relevant agro-forestry occupations is closest to reality.
URI: http://hdl.handle.net/10174/7405
Type: article
Appears in Collections:ICAAM - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
GES - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
CEFAGE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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