Key issues and research priorities for public participation GIS (PPGIS): A synthesis based on empirical research

• Reviews PPGIS research in environmental and urban applications.
• Summarizes key issues for PPGIS based on more than 40 empirical studies.
• Identifies future research priorities to advance PPGIS methods.
• Presents a research agenda to stimulate discourse among PPGIS/PGIS researchers and practitioners.

Public participation GIS (PPGIS) methods have progressed over the last decade, but as a rapidly evolving practice and area of research, there are new challenges. To identify the key issues and research priorities in PPGIS, two researchers that have designed and implemented more than 40 empirical studies spanning both environmental and urban applications present their views about the present and future of PPGIS for land use planning and management. This paper is intended to be a synthesis, but not necessarily a consensus of the key issues and research priorities. We have organized the paper into six general key issues and four priority research topics. The key issues are: (1) conceptual and theoretical foundations, (2) the diversity of definitions and approaches to participatory mapping, (3) the spatial attributes measured in participatory mapping, (4) sampling, participation, and data quality, (5) relationships between participatory mapped attributes and physical places, and (6) the integration of PPGIS data into planning decision support. Our top research priorities include: (1) understanding and increasing participation rates, (2) identifying and controlling threats to spatial data quality, (3) improving the “PP” or public participation in PPGIS, and (4) evaluating the effectiveness of PPGIS. Our purpose for presenting a research agenda is to stimulate discourse among PPGIS researchers and practitioners about future research needs and to provide support for the mobilization of resources to undertake future empirical research.