Tag: VGI
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Completeness of Citizen Science Biodiversity Data from a Volunteered Geographic Information Perspective
Observations of living organisms by citizen scientists that are reported to online portals are a valuable source of information. They are also a special kind of volunteered geographic information (VGI). VGI data have issues of completeness, which arise from biases caused by the opportunistic nature of the data collection process. We examined the completeness of…
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3rd CFP: Journal Special Issue “VGI Analytics” in Geo-Spatial Information Science and AGILE workshop
VGI-Analytics 2017 Volunteered Geographic Information (VGI) and social media data have become part of our everyday lives over the past few years. Whereas in the early beginnings of crowd-sourced data the collection occurred primarily to isolated, individual platforms, contribution patterns are now beginning to be more intertwined between different platforms, both at the application level…
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Special Issue on “Crowdsourced Mapping” Cartography and Geographic Information Science is Online
The Special Issue on “Crowdsourced Mapping” of the international journal “Cartography and Geographic Information Science” is online. Here you can read the editorial. Further this issue includes our paper on Deriving incline values for street networks from voluntarily collected GPS traces. When producing optimal routes through an environment, considering the incline of surfaces can be…
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DeepVGI: Deep Learning with Volunteered Geographic Information
Deep learning techniques, esp. Convolutional Neural Networks (CNNs), are now widely studied for predictive analytics with remote sensing images, which can be further applied in different domains for ground object detection, population mapping, etc. These methods usually train predicting models with the supervision of a large set of training examples. However, finding ground truths especially…
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Invitation: Colloquium Talk by Dr. Yingwei Yan on Using User-Generated Content for Agricultural Pest Management
We cordially invite all interested to our forthcoming talk in the GIScience colloquium next Monday, January 16, on agricultural pest management solutions based on pest observations from farmers. Dr. Yingwei Yan reports on how sensemaking algorithms which can be used to evaluate this kind of volunteered geographic information, and to make forecasts of pest infestations provided…
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cfp: VGI-Analytics 2017 Workshop @ AGILE Conference Wageningen
cfp: VGI-Analytics 2017 Volunteered Geographic Information (VGI): Integration, ANALYsis, applICationS Tuesday, 9th May 2017, Wageningen University, The Netherlands at AGILE 2017 VGI-Analytics 2017 is the 4th workshop in a series of AGILE pre-conference workshops Volunteered Geographic Information (VGI) and social media data have become part of our everyday lives over the past few years. Whereas…
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Heidelberg, Potsdam, Karakol: Christmas Mapping Party Results
On Thursday, 08.12.2016, a Christmas mapping party took place at the Geographical Institute of Heidelberg University. Karakol, a city in the Kyrgyz Republic was herein mapped in cooperation with the German Research Centre for Geosciences (GFZ-Potsdam). Supported by the World Bank, the Bishkek-based Central Asian Institute of Applied Science (CAIAG) and the GFZ Potsdam are…
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Intrinsic quality assessment of building footprints data on OpenStreetMap
Recently some of our work on intrinsic VGI quality analysis has been published. In this work we propose a framework to assess the quality of OSM building footprints data without using any reference data. More specifically, the OSM history data will be examined regarding the development of attributes, geometries and positions of building footprints. In…