Transactions in GIS

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Mapping Large Spatial Flow Data with Hierarchical Clustering
Transactions in GIS - Tập 18 Số 3 - Trang 421-435 - 2014
Xi Zhu, Diansheng Guo
AbstractIt is challenging to map large spatial flow data due to the problem of occlusion and cluttered display, where hundreds of thousands of flows overlap and intersect each other. Existing flow mapping approaches often aggregate flows using predetermined high‐level geographic units (e.g. states) or bundling partial flow lines that are close in space, both of which cause a significant loss or di... hiện toàn bộ
Toward Optimal Calibration of the SLEUTH Land Use Change Model
Transactions in GIS - Tập 11 Số 1 - Trang 29-45 - 2007
Charles Dietzel, Keith Clarke
AbstractSLEUTH is a computational simulation model that uses adaptive cellular automata to simulate the way cities grow and change their surrounding land uses. It has long been known that models are of most value when calibrated, and that using back‐casting (testing against known prior data) is an effective calibration method. SLEUTH's calibration uses the brute force method: every possible combin... hiện toàn bộ
Spatial Differences in Multi‐Resolution Urban Automata Modeling
Transactions in GIS - Tập 8 Số 4 - Trang 479-492 - 2004
Charles Dietzel, Keith Clarke
AbstractThe last decade has seen a renaissance in spatial modeling. Increased computational power and the greater availability of spatial data have aided in the creation of new modeling techniques for studying and predicting the growth of cities and urban areas. Cellular automata is one modeling technique that has become widely used and cited in the literature; yet there are still some very basic ... hiện toàn bộ
Quality Assessment of the French OpenStreetMap Dataset
Transactions in GIS - Tập 14 Số 4 - Trang 435-459 - 2010
Jean‐François Girres, Guillaume Touya
AbstractThe concept of Volunteered Geographic Information (VGI) has recently emerged from the new Web 2.0 technologies. The OpenStreetMap project is currently the most significant example of a system based on VGI. It aims at producing free vector geographic databases using contributions from Internet users. Spatial data quality becomes a key consideration in this context of freely downloadable geo... hiện toàn bộ
Supporting Accessibility for Blind and Vision‐impaired People With a Localized Gazetteer and Open Source Geotechnology
Transactions in GIS - Tập 16 Số 2 - Trang 177-190 - 2012
Matthew Rice, Ahmad O. Aburizaiza, Jacques Tisseau, Brandon M. Shore, Fabiana I. Paez
AbstractDisabled people, especially the blind and vision‐impaired, are challenged by many transitory hazards in urban environments such as construction barricades, temporary fencing across walkways, and obstacles along curbs. These hazards present a problem for navigation, because they typically appear in an unplanned manner and are seldom included in databases used for accessibility mapping. Tact... hiện toàn bộ
Consistency among parts and aggregates: A computational model
Transactions in GIS - Tập 1 Số 3 - Trang 189-206 - 1996
Nectaria Tryfona, Max J. Egenhofer
Heterogeneous geographic databases contain multiple views of the same geographic objects at different levels of spatial resolution. When users perceive geographic objects as one spatial unit, although they are physically separated into multiple parts, appropriate methods are needed to assess the consistency among the aggregate and the parts. The critical aspect is that the overall spatial relation... hiện toàn bộ
Integration of Space Syntax into GIS: New Perspectives for Urban Morphology
Transactions in GIS - Tập 6 Số 3 - Trang 295-309 - 2002
Bin Jiang, Christophe Claramunt
The research field of transportation demand forecasting has started to focus on disaggregate travel behavior and micro‐simulation models. To create data infrastructure, disaggregate trip surveys are conducted and large numbers of observations are collected. To efficiently exploit these surveys, the transfer of the individual trip data to a GIS must start with the development of a solid conceptual ... hiện toàn bộ
Understanding the interplay between bus, metro, and cab ridership dynamics in Shenzhen, China
Transactions in GIS - Tập 22 Số 3 - Trang 855-871 - 2018
Mingliang Yue, Chaogui Kang, Clio Andris, Kun Qin, Yu Liu, Qingxiang Meng
AbstractThe most common mass transit modes in metropolitan cities include buses, subways, and taxicabs, each of which contribute to an interconnected complex network that delivers urban dwellers to their destinations. Understanding the intertwined usages of these three transit modes at different places and time allows for better sensing of urban mobility and the built environment. In this article,... hiện toàn bộ
Spatial Prediction of Landslide Hazard Using Logistic Regression and ROC Analysis
Transactions in GIS - Tập 10 Số 3 - Trang 395-415 - 2006
Pece V. Gorsevski, Paul E. Gessler, Randy B. Foltz, William J. Elliot
Spatial Prediction of Landslide Hazard Using Fuzzy k-means and Dempster-Shafer Theory
Transactions in GIS - Tập 9 Số 4 - Trang 455-474 - 2005
Pece V. Gorsevski, Piotr Jankowski, Paul E. Gessler
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