DHPC Technical Report DHPC-071
Interfacing to On-line Geospatial Imagery Archives
P.D. Coddington,
M.W. Grigg,
S.J. Del Fabbro,
K.A. Hawick,
S.P. James,
E.H.S. Lo,
A.K. Lui,
K.D. Mason,
M.J. Owen.
Archived: 1 July 1999
Published in Proc. of Australasian Urban and Regional Information
Systems Assoc. Conf. (AURISA'99), Leura, NSW, November 1999.
Abstract
Many archives of digital imagery data, such as satellite data
and aerial photography, are being
made available on-line by commercial and government organisations.
To enable different applications to take full advantage of this
wealth of data, archive management software should provide standard
interfaces to services for querying, processing and accessing
geospatial data from distributed on-line data archives.
The Open GIS Consortium (OGC) is developing standards of this kind,
with the goal of enabling an interoperable global geospatial
information infrastructure.
The specifications are based on object-oriented distributed computing
technologies such as CORBA.
The U.S. National Imagery and Mapping Agency (NIMA) has been leading
a similar effort for the defence sector, with the development of the
U.S. Imagery and Geospatial Service (USIGS) architecture.
A major element of USIGS is the Geospatial and Imagery Access Services
(GIAS) specification, which has been submitted as a candidate
for the OpenGIS Catalog Services specification.
We have developed a geospatial image archive server using the
Java programming language, with CORBA interfaces that
conform to the USIGS and GIAS standards.
We discuss some of the issues involved in implementing and using
these specifications, and focus on additional features that are
required to implement a federated system consisting of multiple
distributed image libraries.
We describe a distributed image library system known as IMAD that
has been developed to provide access to multiple GIAS-compliant
image libraries distributed over a wide-area network.
Keywords: Geospatial image archives, spatial data infrastructure,
geographic information systems, OpenGIS, USIGS, GIAS.
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