Glenn Johnstone XXVI SCAR Shanghai, China, July 2002

Report on Geodetic Control

Database project activities

2000 - 2002

Glenn Johnstone XXVI SCAR Shanghai, China, July 2002

Program Activities

• Develop high level metadata index

• Develop template for detailed

distributed database

– control identification information

– tide gauge connection information

Glenn Johnstone XXVI SCAR Shanghai, China, July 2002

NZ contribution

• Paper by John Ritchie (circulated on ggi-l listserver for comments)

• Lack of personnel to continue project

Glenn Johnstone XXVI SCAR Shanghai, China, July 2002

Australian contribution

• National Mapping Division, Geoscience Australia had expertise in Mapserver software and technology

• Using data collected, transformed into ArcInfo files and then into Mapserver format

Glenn Johnstone XXVI SCAR Shanghai, China, July 2002

Mapserver• Open source code developed

by University of Michigan– <mapserver.gis.umn.edu>

• Freely available• OGC compliant software

– ISO TC211 compliant

• Projection file for Antarctica has been developed

Glenn Johnstone XXVI SCAR Shanghai, China, July 2002

Glenn Johnstone XXVI SCAR Shanghai, China, July 2002

Glenn Johnstone XXVI SCAR Shanghai, China, July 2002

Issues encountered• Lack of standardised fields of

data Position and Name(s) and/or code Height Positional uncertainty Ellipsoidal height Ellipsoidal uncertainty Height uncertainty Height Datum Mean sea level height

• Name and position

Glenn Johnstone XXVI SCAR Shanghai, China, July 2002

Future issues

• What fields of information should be included? (ie. a standardised model)

• Further expansion required?– Other countries?– other types of control?

(connections to tide gauges)– distributed database required?