By Peter van Oosterom, Sisi Zlatanova
Tasks, similar to motivate and the united states DHS Geospatial information version, are operating to improve a wealthy set of criteria that might create harmonized versions and issues for the spatial details infrastructure. even though, this is often in basic terms step one. Semantically significant versions needs to nonetheless be built to be able to stimulate interoperability. growing Spatial details Infrastructures (SII) offers options to the issues fighting the release of a very potent SII. best specialists in SII improvement current an entire assessment of SII, together with person and alertness wishes, theoretical and technological foundations, and examples of learned operating SII’s. The booklet comprises semantic purposes in each one dialogue and explains their value to the way forward for geo-information standardization. providing useful recommendations to technical and nontechnical hindrances, this booklet offers the instruments had to take the next move towards a operating semantic web—one that might revolutionize the best way the realm accesses and makes use of spatial details.
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Extra resources for Creating Spatial Information Infrastructures: Towards the Spatial Semantic Web
If we are speaking of the “bearing” from some source point towards some other target point, we have two obvious measures to choose from: (1) a geodesic bearing that is the exit angle of the best geodesic leaving the source point for the target point or (2) a “rhumb” line bearing—the bearing of a curve of constant bearing (a straight line on a Mercator projection) that goes from the source point to the target point. For points fairly close to one another, the two are close to one another, but the longer the distance, the more they will tend to diverge.
Spatial indexes such as r-trees and quadtrees can be used to filter distance queries as well as to locate “nearest” neighbors. Bearing is another issue. Geodesics are generally not of constant “bearing,” that is, their angle from north changes constantly. If we are speaking of the “bearing” from some source point towards some other target point, we have two obvious measures to choose from: (1) a geodesic bearing that is the exit angle of the best geodesic leaving the source point for the target point or (2) a “rhumb” line bearing—the bearing of a curve of constant bearing (a straight line on a Mercator projection) that goes from the source point to the target point.
And D. Marcu. 2005. Machine Translation in the Year 2004. IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP ‘05), 18–23 March 2005, Philadelphia, PA. Leach, P. 2005. A Universally Unique IDentifier (UUID) URN Namespace. txt (accessed June 22, 2007). Lemmens, R. 2006. Semantic Interoperability of Distributed Geo-Services. D. thesis, TU Delft, Delft, The Netherlands. , P. Plini, V. De Santis, and B. Felluga. 2003. EDEN-Inland Waters Glossary. Rome, Italy: Consiglio Nazionale delle Ricerche (CNR), Istituto sull’Inquinamento Atmospherico, Unità Terminologia Ambientale.