digital
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The Harvey 2008 LiDAR data was captured over the Harvey region during February, 2008. The data was acquired by AAMHatch (now AAMGroup) and Fugro Spatial Solutions through a number of separate missions as part of the larger Swan Coast LiDAR Survey that covers the regions of Perth, Peel, Harvey, Bunbury and Busselton. The project was funded by Department of Water, WA for the purposes of coastal inundation modelling and a range of local and regional planning. The data are made available under licence for use by Commonwealth, State and Local Government. The data was captured with point density of 1 point per square metre and overall vertical accuracy has been confirmed at <15cm (68% confidence). The data are available as a number of products including mass point files (ASCII, LAS) and ESRI GRID files with 1m grid spacing. A 2m posting hydrologically enforced digital elevation model (HDEM) and inundation contours has also been derived for low lying coastal areas.
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SRTM Documentation (best viewed with mono-spaced font, such as courier) 1.0 Introduction The SRTM data sets result from a collaborative effort by the National Aeronautics and Space Administration (NASA) and the National Imagery and Mapping Agency (NIMA), as well as the participation of the German and Italian space agencies, to generate a near-global digital elevation model (DEM) of the Earth using radar interferometry. The SRTM instrument consisted of the Spaceborne Imaging Radar-C (SIR-C) hardware set modified with a Space Station-derived mast and additional antennae to form an interferometer with a 60 meter long baseline. A description of the SRTM mission, can be found in Farr and Kobrick (2000). Synthetic aperture radars are side-looking instruments and acquire data along continuous swaths. The SRTM swaths extended from about 30 degrees off-nadir to about 58 degrees off-nadir from an altitude of 233 km, and thus were about 225 km wide. During the data flight the instrument was operated at all times the orbiter was over land and about 1000 individual swaths were acquired over the ten days of mapping operations. Length of the acquired swaths range from a few hundred to several thousand km. Each individual data acquisition is referred to as a "data take." SRTM was the primary (and pretty much only) payload on the STS-99 mission of the Space Shuttle Endeavour, which launched February 11, 2000 and flew for 11 days. Following several hours for instrument deployment, activation and checkout, systematic interferometric data were collected for 222.4 consecutive hours. The instrument operated virtually flawlessly and imaged 99.96% of the targeted landmass at least one time, 94.59% at least twice and about 50% at least three or more times. The goal was to image each terrain segment at least twice from different angles (on ascending, or north-going, and descending orbit passes) to fill in areas shadowed from the radar beam by terrain. This 'targeted landmass' consisted of all land between 56 degrees south and 60 degrees north latitude, which comprises almost exactly 80% of the total landmass.
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The Australian tidal error model is the first attempt to define uncertainties in Mean Sea Level (MSL) around the Australian coastline between tide gauges. Tide gauge observations for the Australian coast span from less than 1 month to greater than 100yrs of observations. The high quality, decade and longer observation tide gauges are used in the production of the frequency dependant error surface. The observed hourly data are analysed using the National Tidal Centre TANS analysis package, resulting in harmonic constituents (used for prediction), a MSL determination, a fitted linear trend and a residual. The power spectrum of the residual is then separated into a predefined set of frequency bins, representing the noise levels of the sea surface proportional to frequency. The longer span observations fill more of this predefined spectrum, specifically the lower frequency errors, which contribute a significant proportion of error. Spatial interpolation around Australia is performed individually for each frequency bin. Using this method allow regions with shorter span observations to have lower frequency error added, creating a synthetic spectrum at the interpolation point. The synthetic spectrums are then used to determine confidence intervals of MSL around the coastline of Australia. The understanding of these errors is an important step for combining bathymetry and topography datasets ultimately creating a seamless national digital elevation model.
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Digital Elevation data record the terrain height variations from the processed point- or line-located data recorded during a geophysical survey. This GSWA Crossland Noonkanbah East Canning 1 GA Canning Basin Onshore Elevation Grid Geodetic is elevation data for the Crossland-Noonkanbah-East Canning Onshore merge, 2007-2009. This survey was acquired under the project No. 1335 for the geological survey of WA. The grid has a cell size of 0.00083 degrees (approximately 90m). This grid contains the ground elevation relative to the geoid for the Crossland-Noonkanbah-East Canning Onshore merge, 2007-2009. It represents the vertical distance from a location on the Earth's surface to the geoid. The data are given in units of meters. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose.
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Digital Elevation data record the terrain height variations from the processed point- or line-located data recorded during a geophysical survey. This GSWA Dumbleyung Nyabing Merge Elevation Grid Geodetic is elevation data for the Dumbleyung-Nyabing-Coblinine merge, 2002-2005. This survey was acquired under the project No. 1328 for the geological survey of WA. The grid has a cell size of 0.00021 degrees (approximately 21m). This grid contains the ground elevation relative to the geoid for the Dumbleyung-Nyabing-Coblinine merge, 2002-2005. It represents the vertical distance from a location on the Earth's surface to the geoid. The data are given in units of meters. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose.
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Digital Elevation data record the terrain height variations from the processed point- or line-located data recorded during a geophysical survey. This GSWA Kellerberrin Southern Cross Boorabbin Hyden Lake Johnston Elevation Merged Grid Geodetic is elevation data for the Kellerberrin-Southern Cross-Boorabbin-Hyden-Lake Johnston merge, 2004-2005. This survey was acquired under the project No. 1330 for the geological survey of WA. The grid has a cell size of 0.00083 degrees (approximately 86m). This grid contains the ground elevation relative to the geoid for the Kellerberrin-Southern Cross-Boorabbin-Hyden-Lake Johnston merge, 2004-2005. It represents the vertical distance from a location on the Earth's surface to the geoid. The data are given in units of meters. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose.
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Digital Elevation data record the terrain height variations from the processed point- or line-located data recorded during a geophysical survey. This GSWA Boorabbin Lake Johnston Elevation Grid Geodetic is elevation data for the Boorabbin-Lake Johnston merge, 1987-2005. This survey was acquired under the project No. 1331 for the geological survey of WA. The grid has a cell size of 0.0005 degrees (approximately 51m). This grid contains the ground elevation relative to the geoid for the Boorabbin-Lake Johnston merge, 1987-2005. It represents the vertical distance from a location on the Earth's surface to the geoid. The data are given in units of meters. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose.
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Digital Elevation data record the terrain height variations from the processed point- or line-located data recorded during a geophysical survey. This GSWA Complete South Yilgarn Elevation Merged Grid Geodetic is elevation data for the Complete Southern Yilgarn merge, 2004-2005. This survey was acquired under the project No. 1339 for the geological survey of WA. The grid has a cell size of 0.00083 degrees (approximately 85m). This grid contains the ground elevation relative to the geoid for the Complete Southern Yilgarn merge, 2004-2005. It represents the vertical distance from a location on the Earth's surface to the geoid. The data are given in units of meters. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose.
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Digital Elevation data record the terrain height variations from the processed point- or line-located data recorded during a geophysical survey. This GSWA Central Canning GA Onshore Canning Elevation Grid Geodetic is elevation data for the GSWA Central Canning, GA Onshore Canning merge, 2007-2009. This survey was acquired under the project No. 1334 for the geological survey of WA. The grid has a cell size of 0.00083 degrees (approximately 89m). This grid contains the ground elevation relative to the geoid for the GSWA Central Canning, GA Onshore Canning merge, 2007-2009. It represents the vertical distance from a location on the Earth's surface to the geoid. The data are given in units of meters. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose.
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Digital Elevation data record the terrain height variations from the processed point- or line-located data recorded during a geophysical survey. This GSWA Newdegate Ravensthorpe Bremer Bay Merge Elevation Grid Geodetic is elevation data for the Newdegate-Ravensthorpe-Bremer Bay merge, 1999-2005. This survey was acquired under the project No. 1332 for the geological survey of WA. The grid has a cell size of 0.00083 degrees (approximately 85m). This grid contains the ground elevation relative to the geoid for the Newdegate-Ravensthorpe-Bremer Bay merge, 1999-2005. It represents the vertical distance from a location on the Earth's surface to the geoid. The data are given in units of meters. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose.