Quarterly Technical Report

October to December 2002

Introduction

At the end of December 2002, there were 25 repositories within the ASDD with a total of 31,380 dataset descriptions available for searching. Statistics are provided for the ASDD covering:

• web access statistics,
• gateway statistics,
• number of records at each repository,
• reliability of repository,

for the months of October, November and December 2002.

Repositories which have provided descriptions are also listed.

Achievements during past quarter

• The "Murray-Darling Basin Commission Documents" is still off line while it is changing Internet service providers.
• Two more repositories have 100% valid XML records.

Web Statistics for ASDD

This quarter's statistics for the ASDD are available for the period 2002-10-01 to 2002-12-30.

A summary of those statistics for this period follows:

Notes:

• There are slightly less visitors and page accesses than the previous quarter.
• The accesses to the images, style sheets and PDF files have been removed from this quarter's statistics.
• This quarter's web statistics exclude those of the ASDD test gateway, the cgi-data and the cgi-bin scripts.
• The IP addresses of the ASDD gateway manager's computer have been removed from this quarter's statistics.
• The Country Domains probably show the wrong value for the USA because most USA domains exclude the ".us" part of their domain.

More statistical details are available for:

• Top 20 Pages
• Top 20 Visitor Domains
• Top Australian Visitor Domains
• Top 30 Australian Government Visitor Domains

Gateway Usage

The following statistics are a summary of the ASDD basic and ASDD power gateways:

ASDD Basic Gateway

• Approximately 4300 searches were made through the ASDD basic gateway.
• Approximately 3600 single search terms were used.
• Approximately 700 multiple search terms were used.

The following links provide more details on the monthly basic gateway statistics:

• Basic gateway October 2002
• Basic gateway November 2002
• Basic gateway December 2002

ASDD Power Gateway

• Approximately 1000 searches were made through the ASDD power gateway.
• Approximately 600 single search terms were used.
• Approximately 400 multiple search terms were used.

The following links provide more details on the monthly power gateway statistics:

• Power gateway October 2002
• Power gateway November 2002
• Power gateway December 2002

Repository Records

The following table lists the repositories, the DTD used, the number of records per repository and the number of XML records that parsed and were accessible at the beginning of October 2002.

Note:

• These results take a long time to generate and may show different numbers to those of the monthly accesses. This could be due to nodes adding metadata to their repositories or some repositories not properly responding to the Z39.50 queries.
• Some nodes have very large XML records (> 100000 bytes) thus making the files difficult to process. This problem may increase when the ASDD nodes switch to the ISO 19115 profile.
• "Not available" means that the server did not respond appropriately to the query at the time of investigation.
• "None" means that no DTD was provided in the XML records or no XML records were available.
• 84% of the records validate against a DTD which is more than last quarter.
• Only 8 repositories are using ANZMETA-1.3.DTD.
• Only 8 repositories have 100% valid records.
• One node was not processed because some of the records were too large. These records seem to have over sized Geographic Extent Polygons.

Repository Reliability

A summary of repository reliability for the period October to December 2002 is given below:

Monthly details about the server, port, database, available records query time and repository availability can be found at:

October
November
December

Repository managers are automatically notified by email if a server goes down for a period longer than four hours.

Repository descriptions

ASDD repository descriptions http://www.ga.gov.au/asdd/tech/node/

It is the responsibility of each repository manager to utilise the online document management application to describe their repository and update the repository description whenever they choose.

The following ASDD repositories are briefly described and include references to further information ...

• Australian Antarctic Data Centre
• Australian Hydrographic Office - Product Metadata
• Australian Oceanographic Data Centre (Blue Pages)
• BRS and Australian Natural Resources Data Library (ANRDL)
• CSIRO Marine Research
• EA Environmental Data Directory (Green Pages)
• Geoscience Australia (formerly AGSO)
• Geoscience Australia - National Mapping Division (formerly AUSLIG)
• IndexGeo Pty Ltd - Eco Companion catalogue
• National Oceans Office
• NSW Natural Resources Data Directory
• NT Spatial Data Directory
• Other Commonwealth Agencies (hosted by BRS)
• Qld Spatial Data (QSIIS)
• Queensland Department of Natural Resources and Mines Spatial Data
• South Australian Spatial Information Directory
• Tasmanian Spatial Data Directory
• Victorian Spatial Data Directory
• WALIS Interragator-Aerial photography
• WALIS Interragator-Environmental Impact Statements
• WALIS Interragator-Bibliographic Data
• WALIS Interragator-Natural Resource Monitoring
• WALIS Interragator-Spatial Data