SPM or State Permanent Mark
See also Map Grid of Australia (MGA)
The Survey Control Marks Database (SurCoM) contains positional, height and other information, relating to Survey Control Marks located at Survey Control Sites in Tasmania.
http://surcom.dpiw.tas.gov.au/surcom/jsp/login/index.jsp
from here you can
- Search for information using a Mark or Site ID, or a defined area of interest;
- Display and obtain Site Summaries for marks in a defined area of interest using LISTMap;
- Download a Basic Mark Report that lists all of the Marks for which survey accurate coordinates and/or heights are currently available; or
- View the SurCoM User Instructions.
Copyright The Geospatial Infrastructure Branch (GIB) - incorporating the Office of the Surveyor General - develops and implements policy, standards, systems and programs in the areas of cadastral survey, geodetic survey, spatial data and survey-related legislation.
http://dpipwe.tas.gov.au/land-property-titles/geospatial-infrastructure-...
The Hobart City Council established similar marks within the city boundaries. Their MGA co-ords are found here (copyright Hobart City Council):
