Gravity data measure small changes in gravity due to changes in the density of rocks beneath the Earth's surface. The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. This Southern_Thomson_Gravity_Traverses_P201401_SCBA267GU.nc grid is a complete Bouguer anomaly grid for the Southern Thomson Gravity Traverses survey. This gravity survey was acquired under the project No. 201401 for the geological survey of NSW, QLD. The grid has a cell size of 0.00095966 degrees (approximately 100m). A total of 3659 gravity stations were acquired to produce this grid.

AUSPOS is Geoscience Australia's on-line static GPS positioning service, providing user access to a state-of-art analysis system via a simple web-interface. Since its launch in 2001, AUSPOS has continued to be a widely used tool for the online processing of geodetic GPS data for surveying, mapping, geodetic, geophysical, hydrographical, mining, construction, military and other applications. On 20 March 2011, Geoscience Australia released an updated version of the service. The updated AUSPOS implements recent advances in analysis software and strategies, the reference frame ITRF2008, AusGeoid09 and the latest transformation parameters between ITRF2008 and GDA94. AUSPOS now delivers precise ITRF2008 coordinates to users within 3-5 minutes while continuing to provide Australian users with access to GDA94 coordinates and derived AHD heights to the highest achievable accuracy by simultaneously processing up to 7 days of user-supplied GPS data from up to 20 sites. The updated AUSPOS also provides more realistic coordinate uncertainty of its solutions using a recently developed assessment method of coordinate uncertainty, which is based on the duration of data sets and their global location. In this presentation, the current status of AUSPOS will be overviewed as well as plans for its ongoing improvement.

On an annual basis floods impact many Australian communities. Some communities are inundated repeatedly over a period of a few years due to inappropriate urban development in flood plain areas. This results in significant logistics for emergency management and disruption to communities. It further results in considerable cost to all levels of government to effect damage repair and enable community recovery. Significantly, there is a need for supporting information on the cost effectiveness of mitigating the risk posed by existing buildings either through retrofit, reconstruction on the site or relocation. The project will address the need for an evidence base to inform decision making on the mitigation of the community risk posed by Australian residential buildings located in flood plain environments, either through poor planning, or placed there by design as part of future planned development.

An application dated 11 February 2013 for verification of a reference standard of measurement under Regulation 12 of the National Measurement Regulations 1999 was received from Department of Environment and Primary Industries, for verification of GDA94 position on their owned or managed station monument. This report documents the processing and analysis of GPS data observed by the Department of Environment and Primary Industries during a 7-day period for eight stations to satisfy the position verification requirements.

The Christmas Island Vegetation and Clearing Map was developed through a collaborative project by Geoscience Australia, Christmas Island Phosphates, and Christmas Island National Park during the 2013/2014 financial year. The map classifies the full extent of Christmas Island into vegetation and land cover classes. The dataset contains four attribute fields; - Level 1 classification - Level 2 classification - Mean tree height (Mean_TreeH) - Area (square m) The majority of data was gathered in 2011, with an exception being the rehabilitation boundaries which are up to date as of May 2014. The data represent the best position achievable with the limited resources available during the project's timespan. Geoscience Australia recognises that some data inputs could be improved with additional field checking. The boundaries of cleared areas have been verified in some cases only and may extend into primary, uncleared vegetation in places; ground-truth verification is strongly advised. Consequently, this information should not be relied upon as the sole information source when making operational decisions.

The integrity and strength of multi-technique terrestrial reference frames, such as realisations of the International Terrestrial Reference Frame (ITRF), depend on the precisely measured and expressed local-tie connections between space geodetic observing systems at co-located observatories. Australia has several observatories which together host the full variety of space geodetic observation techniques, including Global Navigation Satellites Systems (GNSS), Very Long Baseline Interferometry (VLBI), Satellite Laser Ranging (SLR) and Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) beacons. This report documents the technical aspects of the survey undertaken to determine the local-tie connections at the Katherine VLBI Observatory. The Observatory is located at the Charles Darwin University campus near Katherine in the Northern Territory. The Observatory has a 12 m radio telescope that is used for VLBI, co-located with two permanent GNSS sites, one of which contributes to the International GNSS Service (IGS) network. The survey was conducted in July 2010 by surveyors from Geoscience Australia. Precision classical geodetic observations were combined with geodetic GNSS observations to determine for the first time the relationship between the VLBI system invariant point (IVP) and the conventional reference points of the GNSS antennas and the surrounding survey control. The results of this survey have been provided to the International Earth Rotation Service (IERS) for inclusion in the next realisation of the ITRF.

This resource contains bathymetry and backscatter data for the Oceanic Shoals Commonwealth Marine Reserve (CMR) in the Timor Sea collected by Geoscience Australia during September and October 2012 on RV Solander (survey GA0339/SOL5650). The survey used a Kongsberg EM3002 300 kHz multibeam sonar system mounted in single head configuration to map four areas, covering a combined area of 507 square kilometres. Data are gridded to 2 m spatial resolution. The Oceanic Shoals Commonwealth Marine Reserve survey was undertaken as an activity within the Australian Government's National Environmental Research Program Marine Biodiversity Hub and was the key component of Research Theme 4 - Regional Biodiversity Discovery to Support Marine Bioregional Plans. Hub partners involved in the survey included the Australian Institute of Marine Science, Geoscience Australia, the University of Western Australia, Museum Victoria and the Museum and Art Gallery of the Northern Territory. Data acquired during the survey included: multibeam sonar bathymetry and acoustic backscatter; sub-bottom acoustic profiles; physical samples of seabed sediments, infauna and epibenthic biota; towed underwater video and still camera observations of seabed habitats; baited video observations of demersal and pelagic fish, and; oceanographic measurements of the water column from CTD (conductivity, temperature, depth) casts and from deployment of sea surface drifters. Further information on the survey is available in the post-survey report published as Geoscience Australia Record 2013/38 (Nichol et al. 2013).<p><p>This dataset is not to be used for navigational purposes.

Australia's Identified Mineral Resources is an annual national assessment that takes a long-term view of Australian mineral resources likely to be available for mining. The assessment also includes evaluations of long-term trends in mineral resources, world rankings, summaries of significant exploration results and brief reviews of mining industry developments.

Nickel is an important industrial commodity that is used in the manufacture of stainless steel, super-alloys and in rechargeable batteries. Australia holds the world's largest economic resources of nickel, with approximately 25% of global resources (based on latest data from United States Geological Survey, 2012). The bulk of Australia's nickel resources occur in laterite deposits (69%). However, most (82%) of Australia's nickel production is from sulfide deposits hosted by ultramafic volcanic and intrusive rocks (komatiites), within the Archean Yilgarn Craton of Western Australia. Although komatiite-hosted deposits dominate Australian production, this deposit type ranks only fourth in global nickel production (18%), after deposits hosted by large igneous provinces (LIPs) (30%, e.g., Norilsk, Russia), astrobleme (20%, Sudbury, Canada) and tholeiitic intrusion-hosted or 'basal sulfide' deposits (20%, e.g., Voisey's Bay, Canada and Jinchuan, China). Tholeiitic intrusion-hosted nickel sulphide deposits are highly sought exploration targets due to their potential size and co-products of platinum-group elements (PGE) and copper. This brochure highlights Australia's current resources and potential for tholeiitic intrusion-hosted nickel sulphide deposits.

Map showing Australia's Maritime Jurisdiction off the Northwest Shelf. Updated in June 2014 from "Australia's Maritime Jurisdiction off the Northwest Shelf" (GeoCat 69341) to conform with "Australian Maritime Boundaries 2014" data by Geoscience Australia. One of the 27 constituent maps of the "Australia's Maritime Jurisdiction Map Series" (GeoCat 71789). Depicting Australia's continental shelf as proclaimed in the "Seas and Submerged Lands (Limits of Continental Shelf) Proclamation 2012" established under the "Seas and Submerged Lands Act 1973". Background bathymetric image is derived from a combination of the 2009 9 arc second bathymetric and topographic grid by GA and a grid by Smith and Sandwell, 1997. Background land imagery derived from Blue Marble, NASA's Earth Observatory. A0 sized .pdf downloadable from the web.