Distributed Geospatial Analysis through Web Processing ...Distributed Geospatial Analysis through Web Processing Service: A Case Study of Earthquake Disaster Assessment Xiaoliang Meng1
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Distributed Geospatial Analysis through Web
Processing Service: A Case Study of
Earthquake Disaster Assessment
Xiaoliang Meng1
1Research Center of Spatial Information and Digital Engineering, Wuhan University
distributed geospatial analysis. This study comes up
with three methods to orchestrate the chains and
successfully developed a prototype web platform for
deploy the services chains in an Earthquake Disaster
Assessment System. Using BPEL in accompany with
WPS is dependent on WSDL documents. Although a
WSDL document seems redundant for the reason that
the WPS DescribeProcess operation response contains
some same information as a WSDL description,
reusing services can be better supported by
applications like BPEL designer that make it possible
to orchestrate single services using graphical tools. The
use of the WPS interface to orchestrate a service chain
can cover the shortage when facing the problem with
the transfer of binary data, which cannot be
orchestrated using the BPEL approach. Furthermore,
some simple processes can be chained by using
cascading services via WPS GET operation. The
geospatial services chain architecture could be
centralized or cascaded depending on which process
the geospatial services deal with.
Since the assessment of earthquake disaster needs a
wealth of data from different areas, including
population, land use, environment, etc., we designed
the assessment platform, which relies to multiple
distributed computing environments and data sources.
One goal of OGC geospatial data services is to offer
the standard interface for access to distributed data
sources based on SOA principle. BPEL is an important
tool enabling services interoperable and portable
across many environments. The Earthquake Disaster
Assessment System offers access to many distributed
data sources using geospatial services chains
orchestrated by standardized service interfaces
centered on WPS. Through the geospatial services
chains we discussed, combining data sources and data
processes can be tailored to the users’ needs. This
project, in fact, provides the middleware to bridge the
gap between data providers and data users.
The future work of our study will concentrate on
realizing more sophisticated geospatial analyses
through the methods discussed above and complete the
Earthquake Disaster Assessment System which is still
in development.
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Xiaoliang Meng was born in
1981, Wuhan, China. He got his
Bachelor of Engineering from
Wuhan University in 2004. He
now is a candidate of Ph.D in
State Key Laboratory of
Information Engineering in
Surveying, Mapping and Remote
Sensing in Wuhan University.
From 2008 to 2009, he was a
visiting scholar and staff in
Institute for Geospatial Research
and Education, Eastern Michigan
University. His main research interests include WebGIS,
Spatial-Informatics and Digitalized Technology.
Yichun Xie got his diploma in
Geography from Anhui Normal
University in 1978. He received
Master Degree of Arts in Urban
Studies / Urban Planning from
The University of Akron in 1991
and Ph.D in Geography from
State University of New York at
Buffalo in 1994.
He is a professor in
Department of Geography and
Geology and the director of
Institute for Geospatial Research
and Education, Eastern Michigan University. Concentrations:
GIS, Urban Modeling in GIS Environment, Spatial Statistics.