Integrating geodata discovery services with OpenSearch
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Título
Integrating geodata discovery services with OpenSearchAutoría
Tutor/Supervisor
Huerta Guijarro, JoaquínTutor/Supervisor; Universidad.Departamento
Universitat Jaume I. Departament de Llenguatges i Sistemes InformàticsFecha de publicación
2010Resumen
When publishing information in the web, the aim is to make it reach all the
potential interested users, thus content discovery mechanisms are a key web
component. Web content discovery is mainly achieved with ... [+]
When publishing information in the web, the aim is to make it reach all the
potential interested users, thus content discovery mechanisms are a key web
component. Web content discovery is mainly achieved with general purpose
search engines, which use text indexation to select content by keywords.
In the case of Geographic Information (GI), exposing content to text search
engines is not effective. GI needs specific spatial indexing, and use of special-
ized format parsers. Google holds a geoindexing engine, where content can be
exposed to. But this needs specific data treatment, and indexing process is out
of the control of data publishers.
In the case of thematic databases, it can be convenient to provide a cus-
tom web search service. Some well known examples are on-line dictionar-
ies (Wikipedia.org, Wordreference.com), or stores (Amazon.com, Ebay.com).
A9.com proposed a widely used specification called OpenSearch, that provides
means to describe a search engine, its accepted parameters, response formats
and autodiscovery mechanisms.
Geographic Information repositories can also benefit from the use of dedicated
search services. Several approaches to GI search and discovery mechanisms can
be found: The mentioned Google’s Geoindex, the classical OGC standards ap-
proach via Catalogue Services for the Web (CSW) and filter description syntax
(used for instance in WFS feature selection), or the modern Web 2.0 services
approach, consisting of specific web access interfaces (the so-called APIs). This
variety of strategies results in a fragmentation of geodata discovery techniques,
and increases the user’s needed effort to reach geographic contents.
There is a need for a simple, common interface that can be applied to a wide
range of geographic information services. OpenSearch is extensible, and its
“geo” draft extension can be used in a variety of scenarios to fill this gap,
providing a standard, lightweight and flexible discovery mechanism for GI. This
works demonstrates how OpenSearch-geo can be applied successfully to a wide
range of scenarios. [-]
Palabras clave / Materias
Descripción
Treball de Fi de Màster en Sistemes Intel.ligents. Curs 2009/2010
Tipo de documento
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