mapping
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The cartographic collection of the Doc Fisher Geoscience Library consists of the maps and air photos created or acquired by agency staff since the formation of BMR in 1946. This includes maps produced by agencies which have merged with these over the years, such as AUSLIG. Maps held include: Australian geological map series (1:250,000, 1:100,000 and the 1 mile series); topographic maps produced by NATMAP and its predecessors (1:250,000, 1:100,000 and 1:50,000) - latest editions only; various Australian geochemical, geophysical and other thematic maps; geoscience map series from other countries acquired on an exchange basis, including some with accompanying explanatory notes; Non-series maps acquired by donation or exchange; atlases. The Air photos are predominantly those used for mapping Australia and, to a lesser extent, Papua New Guinea and Antarctica, by BMR/AGSO from the 1940s to the 1980s. Geographical coverage of the sets is not complete, but many individual photos are unique in that they have pin points, overlays or other markings made by teams in the field. The Papua New Guinea photographs in the collection may, in many cases, be the only existing copies. Flight diagrams are also held for many (but not all) sets of air photos. Some other related materials, such as montages of aerial photographs (orthophotos), are also represented in the collection.
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Digital Geology and Lithology maps of the Strangways Range Region in the eastern Arunta Region of the Northern Territory have been produced from a scanned image of the first edition map published by the Bureau of Mineral Resources in 1984. The image was digitised using Microstation and ArcInfo software, and attributed to meet standards for Version 2004.01 of the Geoscience Australia Digital Data Dictionary for GIS Produces as closely as possible. The finished product has been provided as ArcView shape files and ArcInfo export files on CD-ROM. Extensive internal quality assurance and quality control processes have been used to verify the data.
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Map of permits currently held by Silver Wave Energy (AC/P49 to 51). Paper size A0.
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Multibeam sonar data incorporates a wide range of metrics of physical seabed properties that can be utilised to generate substrate maps for marine habitat mapping. In particular, statistical descriptors of seabed form and texture can be derived to maximise the information provided by multibeam data. This study investigates the full potential of multibeam data for mapping seabed properties for an area of geomorphically complex seabed on the continental shelf offshore from Point Cloates, Western Australia. In 2008, as part of a collaborative survey within the Commonwealth Environmental Research Facilities (CERF) Marine Biodiversity Hub, Geoscience Australia acquired high resolution multibeam data and sediment samples across a 280 km2 area of the shelf, using a Kongsberg EM 3002 (300 kHz) system. Using this data, a two stage analysis was developed to: (i) separate 'hard seabed (e.g., reefs, ridges and mounds) from 'soft' sediments, and; (ii) predict textural properties for seabed sediments, including %Gravel, %Sand, %Mud, mean grain size and sorting. For a mapping tool, we chose the Random Forest Decision Tree technique. This entailed using ten combinations of input datasets as explanatory variables, including morphometric variables derived from bathymetry, and angular response curves and related statistics derived from backscatter mosaics. The training dataset was derived by combining sediment data from grab samples with locations of hard substrate inferred from bathymetry data. The predictive mapping of 'hard' and 'soft' seabed types resulted in predictions with very strong confidence levels, especially when bathymetry information was combined with backscatter data (i.e., cross-validated Area Under Curve = 0.99). The five sediment properties were predicted with moderate to good cross-validation accuracies (Figure 1). The highest accuracies were achieved for %Mud and Sorting, (R2s equal 0.73 and 0.68, respectively).
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This extended abstract describes the 1:1 million scale Surface Geology of Northern Territory digital dataset and advances in digital data delivery via WMS/WFS services and the GeoSciML geological data model.
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This is a promotional flyer for the Austrlian Mines Atlas that is handed out at conferences and other events. The flyer explains what is available through the Australian Mines Atlas website.
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White's Deposit, which is the original discovery at Rum Jungle, and on which exploration has been mainly concentrated, has so far proved to be the most important deposit in the area. It is situated 2.23 miles on a true bearing of 28 degrees from Rum Jungle Railway Siding and lies on the northern bank of the Finniss River (East Branch) halfway between Brown's Deposit and Dyson's Find. Following upon the favourable results obtained from diamond drilling and shaft sinking in 1950 work was continued at the deposit during 1951 and 1952. The development work and exploration activities are not yet completed, but available evidence has suggested a control of mineralization, which it is hoped will be substantiated by future field work. Geological and assay plans and sections of the mine workings have been prepared on a scale of 20 feet to an inch from theodolite and tape surveys and surface geological plans on a scale of 40 feet to an inch have been produced by plane table and telescopic aledade surveys. A description of the deposit based on results obtained to the end of 1952 is given in the following pages.
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A reconnaissance survey of the eastern half of the Canberra 4-mile sheet was made during the period January - February 1952. The area mapped may be arbitrarily divided into two sections: the western section includes the eastern halves of the Canberra, Michelago, and Bredbo 1-mile sheets, and the eastern section comprises four 1-mile sheets - Lake Bathurst, Braidwood, Araluen and Bendethera. Belts of strongly folded Ordovician, Silurian and Devonian strata, with associated elongate masses of granite rocks, were encountered; they trend gradually northwards. Graptolites collected from Ordovician strata provide means to date these rocks accurately, and further study of the corals collected from Silurian limestones will similarly permit precise dating. Three fossil localities were found in the Devonian strata, but the brachiopods collected, although well-preserved and representative of many genera, do not permit precise stratigraphical placing without more intensive examination. Outcrops are generally very good in all parts except the Lake Bathurst area, where an extensive cover of Tertiary and later deposits obscures the Palaeozoic rocks.
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Class set comprises 10 copies of the Mt Todd student manual. Each manual contains; - comprehensive teaching notes including map projections, scale, latitude and longitude, direction, geological legends, rock types, rock ages, geological features such as folds, faults, intrusions and dipping rocks, geological cross-sections, the link between geology and topography, economic geology and a glossary. - 11 innovative student activities. Copies of the Mt Todd map, the examination and answers to the student activities are not included in the student manuals as this set is designed to be used in conjunction with the Mt. Todd Map Kit, catalogue item 22055.
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Australian Copper Resources Map, 1:10 000 000 as of January 2007