AndreaBozzo/ceres-open-data-index huggingface dataset:
5028 Block 1 (Southwest) Grid of Total Magnetic Intensity (TMI) with Reduction to Pole (RTP) and a First Vertical Derivative (1VD) applied

Total magnetic intensity (TMI) data measures variations in the intensity of the Earth's magnetic field caused by the contrasting content of rock-forming minerals in the Earth crust. Magnetic anomalies can be either positive (field stronger than normal) or negative (field weaker) depending on the susceptibility of the rock. The data 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 5028 Block 1 (Southwest) Grid of Total Magnetic Intensity (TMI) with Reduction to Pole (RTP) and a First Vertical Derivative (1VD) applied is the first vertical derivative of the TMI RTP grid of the Narryer survey.
This grid has a cell size of  degrees (approximately 20m) , and given in units of nT per metre (nT/m).  The data used to produce the TMI grid was acquired in 2024 by the WA Government, and consisted of 415090 line-kilometres of data at 100m line spacing and 50m terrain clearance. The data has had a variable reduction to the pole applied to centre the magnetic anomaly over the magnetised body. The VRTP processing followed a differential reduction to pole calculation up to 5th order polynomial. Magnetic inclination and declination were derived from the IGRF-11 geomagnetic reference model using a data representative date and elevation representative of the survey. A first vertical derivative was calculated by applying a fast Fourier transform (FFT) process to the TMI RTP grid of the Narryer survey to produce this grid. This grid was calculated using an algorithm from the INTREPID Geophysics software package. This grid shows the magnetic response of subsurface features with contrasting magnetic susceptibilities. The grid can also be used to locate structural features such as dykes.

Tags: 1VD, Australia, EARTH SCIENCES, Earth sciences, GADDS2.0, NCI, Published_External, RTP, TMI, WA, airborne digital data, first vertical derivative, geophysical survey, geophysics, greyscale, grid, image, mag, magnetics, magnetism, palaeomagnetism, reduced to the pole, survey 5028, total magnetic intensity
Organization: Geoscience Australia Data
An integrated approach to assessing marine seismic impacts: Lessons learnt from the Gippsland Marine Environmental Monitoring project

Marine seismic surveys are a fundamental tool for geological research, including the exploration of offshore oil and gas resources, but the sound generated during these surveys represents a major source of noise pollution in the marine environment. Recent evidence has shown that seismic surveys may negatively affect some cetaceans, fish and invertebrates, although the magnitude of these impacts remains uncertain. This paper applies a case study on marine seismic impacts (the Gippsland Marine Environmental Monitoring (GMEM) project) to the critical assessment of the advantages and challenges of a multi-faceted field-based approach in the context of future research and management priorities. We found that multiple experimental components, including both conventional and innovative methods, facilitate an interdisciplinary approach and also provide a failsafe in case of limited suitable data. Field observational studies provide an unparalleled level of ecological realism, although their practical challenges must be considered during research planning. We also note the need for appropriate environmental baselines and accessible time-series data to account for spatiotemporal variability of environmental and biological parameters that may mask effects, as well as the need for a standardised technique in sound monitoring and equipment calibration to ensure accuracy and comparability among studies.

<b>Citation:</b> Rachel Przeslawski, Brendan Brooke, Andrew G. Carroll, Melissa Fellows, An integrated approach to assessing marine seismic impacts: Lessons learnt from the Gippsland Marine Environmental Monitoring project, <i>Ocean &amp; Coastal Management</i>, Volume 160, 2018, Pages 117-123, ISSN 0964-5691, https://doi.org/10.1016/j.ocecoaman.2018.04.011.

Tags: EARTH SCIENCES, Published_External, fish, marine, scallop
Organization: Geoscience Australia Data
The sediments of the Argo Abyssal Plain and adjacent areas, northeast Indian Ocean

A series of geophysical traverses by the Atlantis II across the Argo Abyssal Plain, together with coring at a number of selected localities has provided new information on sedimentary and tectonic processes in this region of the northeast Indian Ocean. Isopach maps prepared from the seismic profiles show that sediment thicknesses crudely parallel the bathymetry. The presence of some diapirs in the Argo Abyssal Plain was indicated. It was not possible to say from the present program whether the probable diapirs are salt or mud-cored. A diverse group of cores were obtained from a variety of sites including siliceous clays from below the CCD, calcareous oozes from above the CCD, calcareous clays (showing evidence of abundant sulphate reduction) from a fore-arc basin site, and manganese nodules from an abyssal site. In addition, hyaloclastites from the Joey Rise area (north of the Exmouth Plateau), suggest that the Joey Rise, and possibly also the Roo Rise, are underlain by basaltic material. A sample of basalt was also recovered from the outer part of the Exmouth Plateau.

Tags: Earth Sciences, GA Publication, INA, Journal, NT, Published_External, SIN, WA, marine
Organization: Geoscience Australia Data
National Gravity Compilation 2019 (CSCBA)

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 National Gravity Compilation 2019 (CSCBA) is a complete spherical cap Bouguer anomaly grid for the 2019 Australian National Gravity Grids A series. This gravity survey was acquired under the project No. 202008. This gravity anomaly grid is derived from ground observations stored in the Australian National Gravity Database (ANGD) as at September 2019, supplemented with offshore data sourced from v28.1 of the Global Gravity grid developed using data from the Scripps Institution of Oceanography, the National Oceanic and Atmospheric Administration (NOAA), and National Geospatial-Intelligence Agency (NGA) at Scripps Institution of Oceanography, University of California San Diego. Out of the approximately 1.8 million gravity observations, nearly 1.4 million gravity stations in the ANGD were used to generate this grid. The grid has a cell size of 0.00417 degrees (approximately 435m). The data are given in units of um/s^2, also known as 'gravity units', or gu.

Tags: Australia, Bouguer, EARTH SCIENCES, Earth sciences, GADDS2.0, NCI, None, Published_External, complete, geophysical survey, geophysics, grav, gravity, grid, ground digital data, raster, spherical cap, survey 202008
Organization: Geoscience Australia Data
Geology of the Canberra 1:100 000 Sheet area, New South Wales and Australian Capital Territory

The Canberra 1: 100 000 Geological Sheet covers about 2500 km2 of hilly, upland terrain in the Australian Capital Territory and southeastern New South Wales. The bedrock comprises Ordovician to Silurian sediments and acid volcanics which have been invaded by several generations of Silur

Tags: AU-ACT, Bulletin, Earth Sciences, GA Publication, Published_External, geology
Organization: Geoscience Australia Data
Offshore Sydney Basin and NSW Continental Margin Geochemistry and Sedimentology : Natural Processes, Anthropogenic Contributions and Non-renewable Resources : Project 121.37

This proposal describes a multi-institutional, multi-disciplinary, 28 day survey, to beconducted aboard the BMR research vessel Rig Seismic on the NSW continental margin, between Wollongong, Sydney and Newcastle during September-October of1992.

The survey includes personnel from the Environment Management Unit of theSydney Water Board; Sydney University, Depts. of Geography, Geology andGeophysics, the Ocean Sciences Institute, the Geological Survey of New South Wales, and the Program in Marine Geosciences and Petroleum Geology from the BMR. Partial funding for the survey is being provided by the Sydney Water Boardand Sydney University.
The overall primary objectives include:
1.To collect baseline environmental data on the distribution and chemicalcompositions of sediments (with special reference to anthropogenic materials), whichwill be used for environmental monitoring purpouses in the coastal zone.

2.To provide appropriate scientific data re the juxtapositon of renewable and non-renewable resources on the continental margin, and the discharge of wastes (humanand industrial) from various activities to the coastal zone. These data are one essential aid in managing coastal zone activities adjacent to Australia's majorpopulation centre.
<ol>
<li>To provide new information related to non-renewable resources (hydrocarbons,seafloor minerals and marine sands and aggregates) present in the offshore SydneyBasin.</li>
</ol>

The projects to be conducted include :
(i) Quaternary and Contemporary sedimentation and geochemistry on the continentalshelf.
(ii) The record of Quaternary climate change preserved in sediments on the continental slope
(iii) Easterly changes of sedimentary facies and thermal history of the Permo-Mesozoic Sydney basin rocks.
(iv) Contaminants in continental shelf sediments.
(v) Geochemical characterisation of continental shelf sediments-with special reference to nutrients, nitrogen and phosphorus.
(vi) Continuous geochemical tracer studies of ocean outfalls and estuary/oceanexchanges (with special reference to light hydrocarbons).

The timetable for the survey is shown in Table 1.

Tags: AU-NSW, Earth Sciences, GA Publication, Published_External, Record, geochemistry, marine, marine survey
Organization: Geoscience Australia Data
National Base Map - without labels MapServer

The National Base Map - without labels service provides seamless topographic colour mapping for the whole of Australia, including the outer islands of Norfolk, Lord Howe &amp; Macquarie Islands, the external territories of Cocos (Keeling), Christmas, Heard and McDonald Islands and the Australian Antarctic Territory. The service consists of data sourced from Geoscience Australia, Australian Antarctic Division &amp; OpenStreetMap. The data for Christmas Island has been sourced from the Christmas Island Edition 1 NATMAP Topographic Mapping dataset (1:30,000 scale). The data for Cocos (Keeling) Islands has been sourced from the Cocos (Keeling) Islands Edition 1 NATMAP Topographic Mapping dataset (1:25,000 scale). Vegetaion for the the Australian continent is an aggregated layer from ACLUMP (Australian Collaborative Land Use and Management Program). The topographic information was checked in 2008 using satellite imagery, and supplemented using other sources in 2009. Limited field checking has been undertaken for these data and therefore some information may not be accurate. Information and assistance was supplied by the Attorney General's Department (Territories of Australia) and Department of Environment, Water, Heritage and the Arts (Parks Australia). Geoscience Australia gratefully acknowledges contibutions to data content.) When viewing the map of mainland Australia beyond 1:100,000 scale, the data is derived from the Geoscience Australia GEODATA TOPO 250K product, except roads which are OpenStreetMap data, and in from 1:100,000 scale the data is derived from OpenStreetMap data ( © OpenStreetMap contributors). The suburbs layer is sourced from the Suburb 2018 and 2020 data, Australian Bureau of Statistics. The map portrays detailed graphic representations of features that appear on the Earth's surface. These features include cultural, hydrography, marine, transport, vegetation and relief themes. The SRTM data was acquired by NASA in February 2000 and was publicly released under Creative Commons licensing from November 2011 in ESRI Grid format. The SRTM DEM has quite different characteristics to DEMs derived by interpolation from topographic data. The SRTM data is derived from radar measurements that are dense (there is essentially a measurement at almost every grid cell) but noisy. The main processing of the SRTM DEM product has included: stripe removal, void filling and vegetation offset removal. Processing methods are further described in the 1 and 3 second SRTM Derived Products User Guide (Geoscience Australia, 2011). The bathymetry image used for this map is sourced from Natural Earth. Free vector and raster map data @ naturalearthdata.com. This version of the base map does not have any labelling associated with the map.

Tags: Australia, Base Map, Earth Sciences, MapServer, National Base Map, National Map, Published_External, Topography, web service
Organization: Geoscience Australia Data
Report on 1960 collections of Mesozoic plant fossils from the Northern Territory

This record describes Mesozoic plant fossils collected in 1960 by S. K. Skwarko from thirteen localities in the Northern Territory. The plant fossil localities were closely associated with marine faunal localities and it may shortly be possible to date the plant horizons accurately when determinations of fauna have been made.

Tags: AU-NT, Earth Sciences, GA Publication, Published_External, Record
Organization: Geoscience Australia Data
SSCN SEGMENT 2-B South-west Corner Marine Park Bathymetry Acquisition (20240014S)

This dataset is part of a broader survey carried out by EGS onboard the survey vessel RV Bold Explorer (RV BE) during the  SUBCO Subsea Cable Network (SSCN) cable route survey. 

The area is confined to the data within the South-west Corner&nbsp;Marine Park. The Survey team and client representative joined the RV Bold Explorer on 17th April 2024 at Fremantle Port,  Australia. Following the embarkation of the survey team, equipment testing and commissioning was carried out. Calibration and verification of the DGPS positioning system and survey gyros onboard RV BE were performed while the vessel was alongside at Fremantle Port, Australia between 17th April and 18th April 2024. 

Prior to departure, tow sensors and hull-mounted sensors were wet tested. All systems were found to be operational. The RV Bold Explorer departed Fremantle Port, Australia and transited to the first site on 19th April 2024. The offshore calibration of shallow water multibeam echosounder (MBES) and USBL were performed on 19th April 2024 while the  calibration of deep water MBES was carried out on 20th April 2024.

The SSCN Segment 2-B survey comprised an investigation of bathymetry, seabed features and shallow geology along the proposed route. A subsequent geotechnical sampling programme was also executed.

This dataset is not to be used for navigational purposes.

Tags: AusSeabed, Australia-wide geoscience data, EARTH SCIENCES, HVC_144641, Multibeam, Oceans, Offshore Mapping, Published_External, Resourcing Australia’s Prosperity, bathymetry, marine
Organization: Geoscience Australia Data
Research Cruise Proposal : BMR Cruise 106 : Seabed Morphology and Offshore Resources Around Christmas Island, Indian Ocean : Project 121.32, BMR Offshore Sedimentary Basins Program

Christmas Island is an Australian territory lying south of Java inthe Indian Ocean, at about 10Â°30'S and 105Â°40'E. It lies on oceanic crust of Late Cretaceous age, is moving north at 7cm/year, andis being raised as it climbs the bulge on the southern flank of the Java Trench. The island itself consists of Cainozoic volcanics and limestone, and has been extensively mined for Pliocene phosphate. It covers an area of 140 km2 , and rises 360 m above sea level.

Australia has declared a 200 mile Fisheries Zone around the island, and the aim of this BMR investigation is to assess the seabed morphology, sediment thickness, and offshore mineral resources in a future Exclusive Economic Zone. This information will be of particular value to the Department of Foreign Affairs and Trade, when Australia negotiates a Christmas Island seabed boundary with Indonesia to the north.

Present knowledge indicates that oceanic crust is generally at 5000-6000 m around Christmas Island, and that it is overlain by 100-300m of pelagic sediment which thickens northward toward the Java Trench. A number of volcanic ridges trend generally northeast or north-northeast, and are as shallow as 1200 m below sea level. Christmas Island itself sits on such a ridge. Shallow-water limestones and manganese oxide crusts have been dredged from the ridges. Deepseacoring programs show that pelagic foraminiferal ooze and marl give way to siliceous (diatom-radiolarian) ooze and red clay below 5000 in water depth. Volcanic ash from Indonesia is an additional component of the sediment.

Reconnaissance sampling has shown that manganese nodules are quite common in the deep sea, and that they carry moderate grades of the valuable metals, copper (Cu), nickel (Ni) and cobalt (Co). In a fairly similar geological setting to the west, in the central Indian Ocean, India has pioneer investor status for a nodule mine site of 150,000 square kilometres. At this site the grade of Cu+Ni+Co is about 2.55%,and nodule abundance is 5-7.5% of wet nodules per square metre, figures which suggest that the site has long-term economic potential.

The present project will commence with a 28-day geoscience cruise of R.V. "Rig Seismic" from 7 January to 4 February, 1992. The plan isto acquire about 2500 km of high-resolution reflection seismic and bathymetric data, to define seabed morphology and to allow regional mapping of sediment thickness and facies. The seismic data will beused as the basis of a sampling campaign to investigate sediment type, manganese nodule abundance and metal grade on the deepsea floor, and manganese crust thickness and metal grade on the volcanic ridges. The end result will be a comprehensive review of the geology and mineral resources of the Christmas Island offshore zone.

Tags: CX, Earth Sciences, GA Publication, Published_External, Record, marine, marine survey, morphology
Organization: Geoscience Australia Data
Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

The International Standard ISO 19115-1:2014 (Geographic information – Metadata) defines more than 300 metadata elements, with most of these being listed as Optional. The ISO standard states that individual communities may develop a Profile of the International Standard. The conditionality of a select set of metadata elements may be raised but never reduced for a set of users – optional -&gt; conditional or mandatory but never the other way. A community may also want to establish additional metadata elements that are not in the International Standard. A profile should establish domains for all metadata elements. The rules for creating profiles are described in the International Standard Geographic Information – Profiles (ISO 19106:2004). ISO 19106 stipulates particular terminology that must be used when any variation is made to a Standard, namely referring to changes as an Extension. 
It should be noted that there are no ‘new’ elements in the GA Metadata Profile when compared to the ISO 19115-1:2014. The obligation levels of 18 elements from ISO 19115-1:2014 have been changed, and according to ISO 19106, they form an ‘extension’ to ISO 19115-1:2014. Codelists for two elements have been extended with additional values, and two elements that are free text in the base ISO 19115-1:2014 standard have been constrained by new codelists.
•   This document highlights all mandatory and conditional packages/entities from ISO 19115-1:2014 necessary to fulfil GA business requirements. 
•   All other entities and packages remain available and can be used as required to describe GA products and datasets. 
•   The other entities and packages have to be used as defined by ISO 19115-1:2014.

Tags: Data Standard, Published_External
Organization: Geoscience Australia Data
Informing environmental management with landscape mapping

Under the Antarctic Treaty system, Australia is committed to a range of environmental protection measures. Some, such as Antarctic Specially Protected Areas (ASPAs), are supported by management plans, but these often lack scientific evidence to support robust management decisions. Without the protection of snow and ice, rocky ice-free regions in Antarctica are easily damaged and are slow to recover. We will present examples from the Vestfold Hills, East Antarctica, to show how surficial geology maps in ice-free areas can support evidence-based management of Antarctic Specially Protected Areas (ASPAs) and polar landscapes.

ASPA No. 143 Marine Plain is valued for its “outstanding fossil fauna and rare geological features” (ATCM XXXVI 2013). We used regional geological mapping and field observations to derive recommended access points to the ASPA and reduce the likelihood of damage to fossil fauna. Our results are being used to inform revision of the ASPA management plan which will be considered at the next Antarctic Treaty Consultative Meeting.

We also identified a fragile fossil polychaete reef near Deep Lake in the Vestfold Hills which is vulnerable to accidental damage from trampling. Our results show how physical environmental datasets can support informed management of scientific, wilderness, and aesthetic values.

References:

ATCM XXXIV, 2013. Measure 9. Antarctic Specially Protected Area No 143 (Marine Plain, Mule Peninsula, Vestfold Hills, Princess Elizabeth Land): Revised Management Plan

Presented at the 2024 Australian Antarctic Research Conference

Tags: Antarctic geoscience, Antarctica, Geomorphology and earth surface processes, Published_External, environmental management, geology
Organization: Geoscience Australia Data
Integrated Geological Assessment Reveals Insights into the Prospectivity of Remote Eastern Frontier Basins-Capel and Faust Basins, Offshore Eastern Australia

This AusGeo New article provides an overview of the geological and petroleum prospectivity assessment of the Capel and Faust basins, northern Lord Howe Rise, that was completed during 2006-2010 by the Remote Eastern Frontiers project at Geoscience Australia. The regional setting, data acquisition, assessment methodology and the findings of the study are outlined.

Tags: 3D model, AUSGeo News Article, Earth Sciences, GA Publication, Published_External, marine, petroleum geology, seabed, sedimentary basins, structural geology
Organization: Geoscience Australia Data