@prefix dcat: . @prefix dct: . @prefix foaf: . @prefix gsp: . @prefix locn: . @prefix xsd: . a dcat:Dataset ; dct:description "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 DGIR image is produced from the 2019 Australian National Gravity Grids A series. These gravity data were acquired under the project No. 202008. The grid The grid represented in this image 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. The %%MV_DATASETS/SURVEY_NAME% are derived from ground observations stored in the Australian National Gravity Database (ANGD) as at September 2019, supplemented by 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 together with marine data were used to generate this grid. The ground gravity data used in this grid has been acquired by the Commonwealth, State and Territory Governments, the mining and exploration industry, universities and research organisations from the 1940's to the present day. Station spacing for ground observations varies from approximately 11 km down to less than 1 km, with major parts of the continent having station spacing between 2.5 and 7 km. The image shows de-trended global isostatic residual anomalies (A series) over Australia and its continental margins. This National Gravity Compilation 2019 DGIR image (DGIR) was obtained by subtracting 3 quantities (i.e., the near-field isostatic correction, the far-field isostatic correction, and a first order trend correction) from Complete Bouguer Anomaly data (CBA) of the 2019 Australian National Gravity Grids A series." ; dct:identifier "1f1c0632-81f2-4256-9819-aa126e752b95" ; dct:issued "2026-04-04T07:23:31.852990"^^xsd:dateTime ; dct:language "eng" ; dct:modified "2026-04-04T07:23:31.853000"^^xsd:dateTime ; dct:publisher ; dct:spatial [ a dct:Location ; locn:geometry "POLYGON ((107.9979 -48.0021, 164.0021 -48.0021, 164.0021 -7.9979, 107.9979 -7.9979, 107.9979 -48.0021))"^^gsp:wktLiteral ] ; dct:title "National Gravity Compilation 2019 DGIR image" ; dcat:distribution , , ; dcat:keyword "A series", "Australia", "EARTH SCIENCES", "Earth sciences", "GADDS2.0", "NCI", "None", "Published_External", "de-trended", "geophysical survey", "geophysics", "grav", "gravity", "grid", "ground digital data", "image", "isostatic", "marine data", "raster", "residual", "satellite data", "survey 202008" . a dcat:Distribution ; dct:description "The Geophysical Archive Data Delivery System (GADDS2) portal provides HTTP download of geophysics datasets in a number of formats. Point and line datasets are available in NetCDF and ASEG-GDF2. Grid datasets are available in NetCDF, GeoTIFF and ERS." ; dct:format "HTML" ; dct:issued "2026-04-04T07:23:31.854736"^^xsd:dateTime ; dct:modified "2026-04-04T07:23:31.833228"^^xsd:dateTime ; dct:title "File available for download in various formats from the GADDS2 portal" ; dcat:accessURL . a dcat:Distribution ; dct:description "File download for National Gravity Compilation 2019 DGIR image" ; dct:issued "2026-04-04T07:23:31.854743"^^xsd:dateTime ; dct:modified "2026-04-04T07:23:31.833342"^^xsd:dateTime ; dct:title "National Gravity Compilation 2019 DGIR image file download" ; dcat:accessURL ; dcat:mediaType "application/x-netcdf" . a dcat:Distribution ; dct:description "OPeNDAP web service for National Gravity Compilation 2019 DGIR image" ; dct:format "HTML" ; dct:issued "2026-04-04T07:23:31.854747"^^xsd:dateTime ; dct:modified "2026-04-04T07:23:31.833436"^^xsd:dateTime ; dct:title "National Gravity Compilation 2019 DGIR image OPeNDAP" ; dcat:accessURL . a foaf:Agent ; foaf:mbox "info@aodn.org.au" ; foaf:name "Australian Ocean Data Network" .