! This paper considers Volunteered Geographic Information (VGI), in particular the application of geotagging in social media photographs, as an emerging form of geodemographic consumer surveillance. Although the geoweb is typically framed within a context of participatory engagement with geospatial data by non-expert cartographers (Goodchild 2007; Elwood 2008), scholars have articulated the nee...

We describe the formal speci cation and veri cation of the VGI parallel DSP chip [1], which contains 64 compute processors with 30K gates in each processor. Our e ort coincided in time with the \informal" veri cation stage of the chip. By interacting with the designers, we produced an abstract but executable speci cation of the design which embodies the programmer's view of the system. Given th...

Sketch maps are an intuitive way of expressing geospatial information. They contain objects which represent real world geographic features, relations between these objects, and oftentimes symbolic and textual annotations (Blaser [2]). These elements enable us to use sketch maps to communicate about our environments and to reason about our actions in those environments. In this way sketch maps p...

The quality of OpenStreetMap (OSM) and volunteered geographic information (VGI) in general has already been discussed extensively in the literature. Researchers have looked at this issue from different angles such as credibility [2], trust [1], provenance [12, 9], precision [4], and communities [5]. Comparative studies often use commercial datasets or datasets from a national mapping agencies f...

Several urban studies have been relying on spatial data provided by Volunteered Geographic Information (VGI) sources. The matching of features from different VGI platforms may serve to assess and improve the reliability and completeness of VGI data. In this paper, we propose two strategies for matching points-of-interests (POIs) based on a graph whose nodes and edges represent the POIs and thei...

Volunteer-contributed geographic data (VGI) is an important source of geospatial big that support research and applications. A major concern on VGI quality the underlying observation processes are inherently biased. Detecting hot-spots thus helps better understand bias. Enabled by parallel kernel density estimation (KDE) computational tool can run multiple GPUs (graphics processing units), this...

This paper presents the authors experiences with the development of mobile Volunteered Geographic Information (VGI) applications in the context of the ENVIROFI project and Future Internet Public Private Partnership (FI-PPP) FP7 research programme. FI-PPP has an ambitious goal of developing a set of Generic FI Enablers (GEs) software and hardware tools that will simplify development of thematic ...

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 usi...

Volunteered Geographic Information (VGI), as a special subset of crowdsourcing, has provoked interest from many scientific disciplines and industry in the past few years. OpenStreetMap (OSM) is the most famous and well supported example of a VGI project on the Internet today. As a technology, Digital Earth (DE) offers immediate access to enormous quantities of data and information, referenced b...

The applications of 3D building models are limited as producing them requires massive labor and time costs well expensive devices. In this paper, we aim to propose a novel web-based interactive platform, VGI3D, overcome these challenges. platform is designed reconstruct by using free images from internet users or volunteered geographic information (VGI) even though not all high quality. Our can...