International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004 tert
guaranteed results; each site takes a performance hit for
4. Best Practices for Implementing SDI every search; there is one result set to investigate for each
search node, making comparisons difficult; performance is 2
There are already many examples of catalog portals—many dismal). Recent studies indicate that search users connect "
of which are GIS portals—that support information search directly to selected nodes and browse for data, which is also
and discovery. A short review of a few very typical Web quite inefficient. In 20(
portals provides a helpful context to gain a broader a. The Geospatial Data Clearinghouse is a sharir
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understanding of what's available, how they work, and some collection of over 250 spatial data infor
of the key characteristics that will be important to build a servers, that have digital geographic data vision
working, practical Spatial Data Infrastructure (ESRI. March primarily for use in Geographic Spatiz
/ fr ~ ~ > . 1 ~ 1 CY . * <
2003). GIS Portals http://130.11.52.184/ The URL of the Information Systems (GIS), image ArciN
FGDC Clearinghouse, which is a collection of GIS sites, processing systems, and other modelling ArcG
known as Clearinghouse Nodes. To search many catalogs, software. These data collections can be used
you perform a distributed search across selected nodes. The searched through a single interface based Data
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distributed search method has not worked well in practice for on their descriptions, or "metadata." Arc
numerous reasons (e.g., search sites may not be online so no (ESRI
. Clien
Click on the name of a Clearinghouse Gateway on the map and se
below that is closest to you and you will be presented with a servel
selection of query forms. All entry points or gateways shown applic
have exactly the same lists of servers. Serve:
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Qo ESRI Entry Point to Geospatial Data Clearinghouse
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Select one of the following interfaces to search for spatial data. These options allow you to search for digital geographic data
based on its location, time period of content, full text and fielded search and io select one or more collections to query.
FEW! Search Clearinghouse sites using the "smart select" s
ch Cleannghouse sm it £z {User Java applet)
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Seloct efther a placenamea from the list, drag à rectangle ox the map (zoom ix if you like), or enter
coordinates. until the regio you are interested in is shown as a yellow rectangle in the map frame. This will
help limit your geographic area of search across the Clearinghouse collections.
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d. httpz/deli.dnr.state.mn.us/ Browsing 6
b. www.geographynetwork.com , ESRI's each Web site with its own unique layout
central catalog portal, where users can and design is the most typical access
search for, discover, and directly connect method used today for finding GIS data. Until t
| to numerous GIS Web services and Data This is the State of Minnesota’s site for inform
| Download sites. The Geography Network GIS data search and acquisition. Most propri
references datasets and services for GIS use at such sites is to search for data struct
volunteer GIS participants. Additional by browsing the Web pages at this site being
sites have been added over time to help e. http://www.datamil.udel.edu/ sites u
ESRI learn about best practices and nationalmappilot/ ability
methods. http://www.tnris.org/explorer/ index.htm limitec
c. www.geocommunicator.gov The GIS The State of Delaware's DataMIL site is (NFS)
catalog portal for the U.S. Bureau of an example Web site for searching and GIS ve
Land Management and the U.S. Forest delivering data layers as part of the standa
Service is built using the same USGS National Map. Also listed is the with o:
technology as the Geography Network. State of Texas Geography Network portal Gradu:
Its goal is to provide an access portal to for searching and finding GIS data State- where
Federal Lands information including the wide. These are two in a series of GIS databa
Public Land Survey System (PLSS) sites that provide modern GIS catalog Howe
services for searching. and the
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