Volunteered Geographic Information (VGI) is a recent trend that has been successfully used in order to collect and share geographic information. This method is of interest for scientists who are in need of data and who want to get people involved in their cause. In this paper we discuss the challenges and opportunities that scientists may face when using the concept. An initial challenge is to find users who are willing to contribute. Second, scientist must get these users to interact with the application and with each other. The final goal is to end up with high quality data that can be used for scientific research.
Scientific projects are increasingly using volunteered geographic information (VGI) in order to collect and validate geographic data. This concept relies on the three challenges that A) users can be found and B) be convinced to collaborate and contribute and that scientists finally C) are able to gather high quality data for their projects. In this paper these three challenges are discussed using the experience with three different research projects.
Scientific projects are increasingly using volunteered geographic information (VGI) in order to collect and validate geographic data. This concept relies on the three challenges that A) users can be found and B) be convinced to collaborate and contribute and that scientists finally C) are able to gather high quality data for their projects. In this paper these three challenges are discussed using the experience with three different research projects.
<p><strong>Abstract.</strong> This paper describes a process for the automated generation of 3D buildings using 2D building footprints derived from cadastral maps and LIDAR point cloud data. In our approach we extract relevant geometric information from 2D building footprints in order to classify point cloud data. One key concept is the fact that roofs in most cases are aligned to the angles of the walls of a building. This concept is utilized to create contiguous surfaces and to extract ridges. In a field study involving two historic city centers in Switzerland we evaluate the results of our approach.</p>
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