Global Drought Monitoring Service through the GEOSS Architecture ...

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Architectural Implementation Pilot, Phase 3 Version: 2.0 Global Drought Monitoring and European Drought Observatory-Water SBA Engineering Report Date: 11/Feb/2011 Figures 12 (a) DIAS cross disciplinary areas (Koike 2010) and (b) DIAS Ontology Development Page 38
Architectural Implementation Pilot, Phase 3 Version: 2.0 Global Drought Monitoring and European Drought Observatory-Water SBA Engineering Report Date: 11/Feb/2011 Architecture (Nagai 2010) Figure 13 (Nagai 2010) 3.4.1 Adding Advanced Search and Discovery using Semantics The AIP-3 video 23 , “Drought—European” includes a walkthrough demonstrations, in which users select scientific terms (or “concepts”) and, secondly, the geographic region or spatial domain which is defined within a bounding box. This reflects the division into lexicographic and geographic content which has been cited in Section 3.5. The purpose of the semantic enrichment was to supplement keyword searches, such as used on Google, by adding search capability that could search through concepts; this is tantamount to adding “Semantics.” In other words, one is not searching for “drought” as a keyword; one is searching for “drought” as a concept, combined with search functionality that allows the user to select broader or narrower searches within the drought field or within allied fields. For example, “water” is a concept which can be broken up into underlying processes of “evapotranspiration,” “streamflow,” “precipitation,” “soil moisture,” “snow cover,” and “groundwater.” The stores of water are a subset or part of water, and this class structure is affected in the arrangement of the terms within the semantic network. Datasets can be registered to each of these terms, so that queries of “hydrologic drought indicators” reveal “groundwater” data, “streamflow” data, such as baseflow, and other water budget information for a selected area. The EuroGEOSS discovery broker has the capability to access the GI-Cat registered datasets on groundwater, river discharge, water usage, and other data. Search-by-concept is intended to not only improve the “hit-or-miss” success rate of recall of datasets through keyword searches alone but also reduce the high amounts of irrelevant returned results in keyword searches. Figure 8 is a screen capture of the search interface in the AIP-3 “Drought—European” 23 http://www.ogcnetwork.net/pub/ogcnetwork/GEOSS/AIP3/pages/Demo.html Page 39
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