At this scale 1cm on the map represents 1km on the ground. Each map covers a minimum area of 0.5 degrees longitude by 0.5 degrees latitude or about 54 kilometres by 54 kilometres. The contour interval is 20 metres. Many maps are supplemented by hill shading.

60% coverage north F53/B1-170 Vertical scale: 50

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1st edition Available from GSWA or as a GA Library resource

Out of print. Available from GSWA or as a GA Library resource

At this scale 1cm on the map represents 1km on the ground. Each map covers a minimum area of 0.5 degrees longitude by 0.5 degrees latitude or about 54 kilometres by 54 kilometres. The contour interval is 20 metres. Many maps are supplemented by hill shading. These maps contain natural and constructed features including road and rail infrastructure, vegetation, hydrography, contours, localities and some administrative boundaries. Product Specifications Coverage: Australia is covered by more than 3000 x 1:100 000 scale maps, of which 1600 have been published as printed maps. Unpublished maps are available as compilations. Currency: Ranges from 1961 to 2009. Average 1997. Coordinates: Geographical and either AMG or MGA coordinates. Datum: AGD66, GDA94; AHD Projection: Universal Transverse Mercator UTM. Medium: Printed maps: Paper, flat and folded copies. Compilations: Paper or film, flat copies only.

Legacy product - no abstract available

Legacy product - no abstract available

The earliest known gravity measurements in Australia were made by French expeditions in 1819 and 1824, using pendulums at Sydney. Later in the 19th century, further pendulum measurements with an accuracy of about 10 mGal were made at various capital cities by observers from Britain, Bavaria, Austria-Hungary, Russia and Italy. A very early gravity meter was designed and constructed at Sydney University during the last decade of the century, but was used only experimentally. Reasonably accurate gravity meter surveys started about 1947. The Cambridge pendulums were used in 1950-51 to establish a national network of 59 stations with an accuracy of about 0.8 mGal; this was supplemented between 1950 and 1959 by gravity meter and pendulum measurements made as part of international surveys, which also helped to relate the Australian datum to the international network. Meanwhile, surveys, mainly for geophysical prospecting, were made by Government authorities, universities, and private companies; some of these surveys covered extensive areas and enabled compilation of a preliminary Bouguer anomaly map in 1959. Early marine gravity surveys included observations in nearby oceans with Vening Meinesz submarine pendulums, gravity measurements on offshore islands and reefs, and from 1956, underwater gravity meter surveys on the continental shelf. Two factors stimulated regional gravity coverage in 1959 - firstly the Petroleum Search Subsidy Act, which ensured that exploration data from subsidized surveys were publicly available, and secondly, use of helicopters for reconnaissance gravity coverage of the continent, which was completed in 1973. Gravity data at sea were obtained mainly from reconnaissance marine geophysical surveys carried out under contract to BMR between 1965 and 1973, but include also traverses by international survey vessels and exploration companies. Gravity meter calibration ranges were established in the main cities in 1960-61. Gravity values at the Cambridge pendulum stations were revised in 1962 using all relevant data, to establish a more accurate control network with standard errors ranging from 0.2 to more than 0.4 mGal for compilation of data from many surveys. These values were superseded by the Isogal Project of 1964-67, which gave values with standard errors of 0.1-0.2 mGal, in which several gravity meters were transported by aircraft along transcontinental east-west traverses. Values at the eastern ends of the traverses, forming part of the Australian Calibration Line (ACL), were established by a US Air Force survey in 1965. The accuracy of the ACL was significantly improved by Soviet pendulum measurements in 1972-74, and joint Soviet-Australian gravity meter measurements in 1973 - a precision of about 0.01 mGal being achieved.

No abstract available