This paper situates geospatial technologies as a constructivist tool in the K-12 classroom and examines student experiences with real-time authentic geospatial data provided through a hybrid adventure learning environment. Qualitative data from seven student focus groups demonstrate the effectiveness of using real-time authentic data, peer collaboration, and geospatial technologies in learning ...

Stream networks are important features for hydrologic modeling, geomorphologic analysis of landscape, and many other applications. Automatic extraction of stream network from digital elevation model (DEM) has been implemented in major GIS software such as ArcGIS and GRASS based on flow direction along steepest descent and using some threshold criteria to separate channels and hillslope. However...

The ability to represent geospatial semantics is of great importance when building geospatial applications for the Web. Semantic Web Service technology provides solutions for intelligent service annotation, discovery, composition and invocation in distributed environments. Deploying this technology into geospatial web applications has the potential to enhance discovery, retrieval and integratio...

Boolean division, and hence Boolean substitution, produces better result than algebraic division and substitution. However, due to the lack of an e cient Boolean division algorithm, Boolean substitution has rarely been used. We present an e cient Boolean division and substitution algorithm. Our technique is based on the philosophy of redundancy addition and removal. By adding multiple wires/gat...

Boolean division, and hence Boolean substitution, produces better result than algebraic division and substitution. However, due to the lack of an efficient Boolean division algorithm, Boolean substitution has rarely been used. We present an efficient Boolean division and Boolean substitution algorithm. Our technique is based on the philosophy of redundancy addition and removal. By adding multip...

Geospatial metadata have long played an important role in the management of geospatial datasets. Often employed by institutions to organise, maintain and document their geographic resources internally, metadata may also provide a vehicle for exposing marketable data assets externally when contributed to on-line geospatial exchange initiatives. In spite of the numerous benefits it affords, obsta...

we designed and implemented an integration framework of enterprise business information and multi-source heterogeneous geospatial information based on composition of semantic geospatial Web service. It can integrate business information and geospatial information seamlessly and effectively in enterprise workflow. An example of tobacco planting spatial analysis this framework was described to ve...

1Alan M. MacEachren is Professor and Director of the GeoVISTA Center, Department of Geography, 302 Walker, Penn State University, University Park, PA 16802 USA; e-mail: [email protected] and Menno-Jan Kraak is Professor and Head of Division of Geoinformatics, Cartography and Visualization, ITC, PO Box 6, 7500 AA Enschede; e-mail: [email protected] This special issue of Cartography and Geographic Inf...