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Starting
with this chapter, the discussion focuses will shift from previous
fundamental concepts and technologies of Internet GIS to the actual
application of Internet GIS in different areas, such as data sharing
and data warehousing, transportation, planning, resource management,
etc. This chapter will focus on applying Internet GIS in data sharing
and data warehousing from both aspects of data provider and data
user. Starting from the basic elements of sharing, discovering and
accessing geospatial data on the Internet, it discusses metadata
and two major geospatial data portals: the Geospatial Data Clearinghouse
Activity at the U.S. Federal Geographic Data Committee, and the
Geography Network and G.Net managed by ESRI, Inc. Examples of major
geospatial data providers are also provided in the chapter.
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Chapter 11 Distributed GIS in Data Warehousing and Data Sharing
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| 11.1.
Introduction |
| 11.2
Accessing Geospatial data over the Internet: Browsing or Searching |
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11.2.1
Index and Catalog Geospatial Information
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11.2.2
Metadata Catalog Services
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11.2.3
An Efficient Search Mechanism
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11.2.4
Geospatial Data Transfer and Distributions
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11.2.5
A Data Discovery Client
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| 11.3
National and Global Spatial Data Infrastructure |
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11.3.1
The Geospatial Data Clearinghouse Activity
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11.3.2
The Framework of the Geospatial Data Clearinghouse Activity
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| 11.4
The Geography Network and G.NET |
| 11.5
Samples of Other Geospatial Data Providers |
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11.5.1
The U.S. National Imagery and Mapping Agency (NIMA)
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11.5.2
The NASA's Terra Sensors Data Services
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11.5.3
Data Services at NASA's Distributed Active Archive Centers
(DAACS)
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11.5.4
The USGS Earth Resource Observation Systems Data Centers
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11.5.5
The Terra Server
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11.5.6
Space Imaging
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11.5.7
The US Bureau of Transportation Statistics (BTS)
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11.5.8
American Factfinder - US Census Bureau
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11.5.9
The US Department of Housing and Urban Development (HUD)
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| 11.6
Conclusions and Summary |
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- FGDC
Clearinghouse (http://www.fgdc.gov/clearinghouse/clearinghouse.html)
The Clearinghouse Activity, sponsored by the FGDC, is a decentralized
system of servers located on the Internet which provide standardized
metadata to facilitate query and consistent presentation across
multiple participating sites. It uses readily available Web technology
for the client side and uses the ANSI standard Z39.50 for the
query, search, and presentation of search results to the Web client.
If you are new to the idea of metadata or clearinghouse, please
refer the questions
and answers for an overview of the technology. If you would
like to set up your own node of the clearinghouse, you may refer
to the tutorial.
This website also provides complete reference
material for technical support and development of the Metadata.
You can also search geospatial
data via the clearinghouse.
- Isite
(http://www.cnidr.org/isite.html
)
This website is hosted by the CNIDR
(Center for Networked Information Discovery and Retrieval). CNIDR
provides a series
infomation retrieval services to the public community, among
that is the Isite. Isite is an integrated Internet publishing
software package which includes a text index/search system (Isearch)
and Z39.50 communication tools to access databases. Within this
page, you can download the Isite software package, review the
overall architecture of the package, and read the documentation.
You may also find the other sites that apply the software package
as well.
- Z39.50
(http://www.loc.gov/z3950/agency/)
"Z39.50" refers to the International Standard, ISO 23950:
"Information Retrieval (Z39.50): Application Service Definition
and Protocol Specification", and to ANSI/NISO Z39.50. The
standard specifies a client/server-based protocol for searching
and retrieving information from remote databases. This page, hosted
by the Library of Congress, provides links to information about
Z39.50 resources and about the development and maintenance of
Z39.50 (existing as well as future versions) and the implementation
and use of the Z39.50 protocol.
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