In this article we present GeoTxt, a scalable geoparsing system for the recognition and geolocation of place names in unstructured text. GeoTxt offers six named entity recognition (NER) algorithms for place name recognition, and utilizes an enterprise search engine for the indexing, ranking, and retrieval of toponyms, enabling scalable geoparsing for streaming text. GeoTxt offers a flexible application programming interface (API), allowing for customized attribute and/or spatial ranking of retrieved toponyms. We evaluate the system on a corpus of manually geo-annotated tweets.First, we benchmark the performance of the six NERs that GeoTxt provides access to. Second, we assess GeoTxt toponym resolution accuracy incrementally, demonstrating improvements in toponym resolution achieved (or not achieved) by adding specific heuristics and disambiguation methods. Compared to using the GeoNames web service, GeoTxt's toponym resolution demonstrates a 20% accuracy gain. Our results show that places mentioned in the same tweet do not tend to be geographically proximate.
The value of field trips is undisputed across disciplines. Field-site visits whether in social or physical sciences provide grounding for place- and discovery-based learning. Yet field trips have limitations that can now be overcome by the promise of immersive technologies that can improve quality and accessibility. This promise is twofold: First, we can harness advancements made in sensing technologies to create immersive experiences of places across the earth efficiently; second, we can provide detailed empirical evaluations on immersive learning and quantify educational value. We report on a study that splits an introductory geosciences course into two groups with one group experiencing a traditional field trip, while a second group visits the same site virtually, immersing the students in the site using a head-mounted device. Results show the advantages of virtual field trips (VFTs) concerning enjoyment, learning experience, and actual lab scores. We embed the discussion of these results into a more general assessment of the advantages of VFTs and a taxonomy of VFTs as a basis for future studies.
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