Title: The effects of sample size on data quality in participatory mapping of past land use
Authors : Rohrbach, Beni
Anderson, Sharolyn
Laube, Patrick
Published in : Environment and Planning B: Planning and Design
Volume(Issue) : 43
Issue : 4
Pages : 681
Pages to: 697
Publisher / Ed. Institution : Sage
Issue Date: 2015
License (according to publishing contract) : Licence according to publishing contract
Type of review: Not specified
Language : English
Subjects : Land-use; Participatory mapping
Subject (DDC) : 333.7: Land, recreational areas and energy
Abstract: In this article, we examine the effect of sample size on spatial data quality in participatory mapping for assessing past land use. Using a map-based questionnaire, we capture changes in the extent and location of arable farmland 20 years ago. We then compare the results of the participatory mapping with reference data from the literature and accordingly calculate quality measures based on notions of correctness and completeness. In our data, correctness is high only for areas marked by many participants; the completeness metric increases as a function of the total area delineated by the participants. These data quality metrics then are analysed for subsamples, which are computed through leave-p-out jackknifing from our sample. This cross-validation addresses the question as to whether our data would be considered correct and complete having had included fewer participants. We present evidence that a small number of participants – in our case, less than 10 – already yield high-quality data. Further, we can demonstrate that aggregating the data from those participants with highest individual data quality values does not generate the best data quality as a group. This work provides a contribution to the use of participatory mapping for gathering correct and complete data.
Departement: Life Sciences and Facility Management
Organisational Unit: Institute of Natural Resource Sciences (IUNR)
Publication type: Article in scientific Journal
DOI : 10.1177/0265813515618578
ISSN: 0265-8135
URI: https://digitalcollection.zhaw.ch/handle/11475/11873
Appears in Collections:Publikationen Life Sciences und Facility Management

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