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Slightly more complex algorithms rely on local optimization to reach a local optimum of a placement evaluation function – in each iteration placement of a single label is moved to another position, and if it improves the result, the move is preserved. It performs reasonably well for maps that are not too densely labelled.
A position circle is a circle that can be measured both from a chart and from the surface of the earth for the purpose of position fixing.For the purposes of land or coastal navigation, a position circle can be generated by making a horizontal angle measurement between two landmarks using a sextant.
Position resection and intersection are methods for determining an unknown geographic position (position finding) by measuring angles with respect to known positions.In resection, the one point with unknown coordinates is occupied and sightings are taken to the known points; in intersection, the two points with known coordinates are occupied and sightings are taken to the unknown point.
Two or more objects of known position are sighted, and the bearings recorded. Bearing lines are then plotted on a chart through the locations of the sighted items. The intersection of these lines is the current position of the vessel. Usually, a fix is where two or more position lines intersect at any given time.
In the post Second World War period, the Surveyor-General was also Director of Mapping, but in 1995 lost this position to the Office of Geographic Data Coordination (OGDC) which became the Land Information Group (LIG) under Land Victoria. The responsibilities have continued with another business unit under what is now Land Use Victoria.
Map of the 37 Victorian counties. Cadastral divisions in Victoria are called counties, which are further subdivided into parishes and townships, for cadastral or land administration purposes. Cadastral divisions of county, parish and township form the basis for formal identification of the location of any piece of land in the state.
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In Victoria, the then Executive Director of Land Victoria, Elizabeth O'Keeffe, was a leading promoter of the NSAA. In September 2001, O’Keeffe signed a contract with the Australian Spatial Information Business Association (ASIBA), which later became known as the Spatial Information Business Association (SIBA), and in 2022 the Geospatial ...