ABSTRACT
ABSTRACT The use of volunteered geographic information (VGI) or crowdsourced data (Goodchild, 2007) has become a common approach for data collection in recent years. This has caused several people to propose the use of VGI to collect data for various fields. Success stories were the ( nongeographic) Wikipedia encyclopedia and OpenStreetMap (OSM). The use of VGI in land administration has also been proposed. Robin McLaren (2011) proposed crowdsourcing as a way to increase citizen collaboration for land administration to enhance transparency at lower costs. Keenja et al. (2012) discussed the perception of VGI within the Dutch cadaster. Basiouka and Potsiou (2012) even discuss how crowdsourcing can be used to identify errors in the Hellenic cadaster. One problem of VGI is quality control (compare Goodchild and Li, 2012). Only a small group of people can verify the correctness of specific types of information in a land administration system. A cadastral boundary line, for example, marks the border between two pieces of land (parcels). The correct location of the boundary can only
CONTENTS
10.1 Introduction ................................................................................................ 148 10.2 Land Administration ................................................................................ 149 10.3 Volunteered Geographic Information ..................................................... 151 10.4 Quality of VGI Data ................................................................................... 152
10.4.1 Precision of VGI Data .................................................................... 153 10.4.2 Completeness of VGI Data ............................................................ 154
10.5 Checking Entered Data ............................................................................. 154 10.5.1 VGI for Data Describing Rights ................................................... 154 10.5.2 VGI on Physical Objects and Their Properties .......................... 155 10.5.3 VGI on the Environment ............................................................... 156
10.6 Practical Issues ........................................................................................... 156 10.7 Conclusions ................................................................................................. 159 References ............................................................................................................. 160
be assessed by the owners of these parcels or by a surveyor after investigation and measurement. How can VGI provide reliable data if the correctness cannot be checked easily? Only boundaries between areas of different land use may be visible and thus verifiable, but land administration is equally dependent on ownership boundaries. In this chapter, we discuss the types of data used in land administration as defined by Dale and McLaughlin (1999). These categories are then analyzed to identify the areas where VGI can actually provide reliable input. Such an analysis shows how to use the methodology of crowdsourcing for land administration and clarifies the limits of such use.
