Browsing by Subject "Geospatial data"
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Item Data-rich document geotagging using geodesic grids(2011-05) Wing, Benjamin Patai; Baldridge, Jason; Erk, KatrinThis thesis investigates automatic geolocation (i.e. identification of the location, expressed as latitude/longitude coordinates) of documents. Geolocation can be an effective means of summarizing large document collections and is an important component of geographic information retrieval. We describe several simple supervised methods for document geolocation using only the document’s raw text as evidence. All of our methods predict locations in the context of geodesic grids of varying degrees of resolution. We evaluate the methods on geotagged Wikipedia articles and Twitter feeds. For Wikipedia, our best method obtains a median prediction error of just 11.8 kilometers. Twitter geolocation is more challenging: we obtain a median error of 479 km, an improvement on previous results for the dataset.Item Session 2D | Introduction to ArcGIS Online(2022-05-24) Shensky, Michael; Jones, Sylvia; Carter, KateThis 90-minute session will provide a brief introduction to geographic information systems (GIS) and ArcGIS Online. It will show how ArcGIS Online can be used to manage, visualize, and share geospatial data. Participants will learn how to search ArcGIS Online for data, upload local datasets, customize dataset symbology, and carry out basic analysis. They will also learn how to create content in ArcGIS Online by publishing a hosted feature layer and by saving and sharing a web map. The workshop structure will consist of presentation slides and a hands-on interactive portion where participants will gain direct experience working with ArcGIS Online. This session is intended for all TCDL attendees who are interested in GIS and no prior experience is required. It is preferred that attendees have a pre-existing institutional ArcGIS Online account created prior to the start of the workshop, but this is not a requirement and attendees will have the option to create a public ArcGIS Online account during the session. Participants will be given time to ask questions at the end of the workshop.