20210907 11591900 1.0 ISO 19139 Metadata Implementation Specification GML3.2 FALSE ELEVATION_LOWER_DARLING_1M_DEM_2013_SFA201 -2364.758300 97357.241700 6217369.983900 6331089.983900 1 Projected GDA2020 Linear Unit: Meter (1.000000) GDA2020_MGA_Zone_55 <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/10.8'><WKT>PROJCS[&quot;GDA2020_MGA_Zone_55&quot;,GEOGCS[&quot;GDA2020&quot;,DATUM[&quot;GDA2020&quot;,SPHEROID[&quot;GRS_1980&quot;,6378137.0,298.257222101]],PRIMEM[&quot;Greenwich&quot;,0.0],UNIT[&quot;Degree&quot;,0.0174532925199433]],PROJECTION[&quot;Transverse_Mercator&quot;],PARAMETER[&quot;False_Easting&quot;,500000.0],PARAMETER[&quot;False_Northing&quot;,10000000.0],PARAMETER[&quot;Central_Meridian&quot;,147.0],PARAMETER[&quot;Scale_Factor&quot;,0.9996],PARAMETER[&quot;Latitude_Of_Origin&quot;,0.0],UNIT[&quot;Meter&quot;,1.0],AUTHORITY[&quot;EPSG&quot;,7855]]</WKT><XOrigin>-5120900</XOrigin><YOrigin>1900</YOrigin><XYScale>450445547.3910538</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>7855</WKID><LatestWKID>7855</LatestWKID></ProjectedCoordinateSystem> 32 FALSE None 1 AMD TRUE continuous floating point 15000 15000 1000 100 2048 50 75 0.01 10 600 300 FULL 0 NorthWest,Center,LockRaster,ByAttribute,Nadir,Viewpoint,Seamline,None LERC,None,JPEG,LZ77 None None,Basic,Base-Top Height,Top-Top Shadow Height,Base-Top Shadow Height,3D -1 -1 0.8 1 NorthWest,Center,LockRaster,ByAttribute,Nadir,Viewpoint,Seamline,None None,JPEG,LZ77,LERC None,Basic,Full NONE <_docversion_ Sync="TRUE">10 Name,MinPS,MaxPS,LowPS,HighPS,Tag,GroupName,ProductName,CenterX,CenterY,ZOrder,Shape_Length,Shape_Area 0 0 -1 1 0 Generic 36450 1 729 20210709 15391700 20210709 15423900 ISO19139 150000000 5000 Data Management Murray-Darling Basin Authority Spatial Data 1800 630 114 (free call) GPO Box 1801 Canberra ACT 2601 AU gis@mdba.gov.au Data Management Murray-Darling Basin Authority Spatial Data 1800 630 114 (free call) GPO Box 1801 Canberra ACT 2601 AU gis@mdba.gov.au The data joins two existing LiDAR datasets, one to the north covering the Menindee Lakes and the other in the south along the Murray River corridor. It is... <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Digital Elevation Model (DEM)A DEM with a ground pixel spacing of one metre was generated from the LiDARground points. The method of deriving the height for each grid point is bytriangulation between the three nearest LiDAR ground points. Hydro flattening wasapplied using waterlines (break lines) that were manually digitised using the LiDARand ortho photography as reference for areas of non-tidal water greater than 625 square metres and watercourses nominally greater than 30 metres in width.</SPAN></P><P><SPAN>The DEM was exported to ESRI Binary grid as 1km by 1km tiles in accordance with ICSM specifications (December 2012).</SPAN></P><P><SPAN>Coordinate System Projection: MGAZone: 54Horizontal Datum: GDA94Vertical Datum: AHD71 (Ausgeoid09)Spatial Services</SPAN></P><P><SPAN>The DEM accuracy will be limited by the spatial accuracy of the LiDAR point data and will contain some additional error due to interpolation, particularly in areas of dense vegetation where ground points are sparse. The may also be a small amount of error due to ground point misclassification.</SPAN></P><P><SPAN>Equipment and Software Two Airborne Trimble Harrier 68i/G1 Airborne Laser Scanning (ALS) systems were used to aquire the data for this project. The Harrier 68 ALS systems contain the following instruments• Riegl LiDAR scanning instrument,• Rollie 39 or 80 mega-pixel camera• Applanix POS/AV 410 Inertial Motion System and 12 channel, dual frequency GPS.LiDAR Scanner SpecificationsLaser instrument: Riegl LMS-Q680Beam deflection: Pyramid. Polygon MirrorField of view: ±22,5 degrees to ±30.0 degreesMeasurement rate: 266,000 HzOperating altitude: 50 m – 2,500 m AGLBeam divergence: 0.5 mradDetection Method: Full wave form processingIntensity capture: 16 bitEye safe: Class 1Swath width: 83 % of altitude (45 deg) 115 % of altitude (60 deg)Range resolution: 0.04 mCross strips form networks of, overlapping, LiDAR strips. </SPAN></P><P><SPAN>TopoSys software was used tol evel the LiDAR strips to establish internal integrity. The data were processed in fouroverlapping blocks. The survey strips were adjusted to the control strips in increments of1cm, while viewed in profile. Several profiles were measured in each intersecting block andadjustments were averaged along the strip. This process established the internal integrity of LiDAR point cloud and GPS/IMU data. No automatic strip adjustments were applied as thiscan introduce errors and allow exiting errors to avoid notice.A 1km x 1km grid was generated and the LiDAR point cloud was cut to the 1km x 1km tiles.Tiles were automatically classified to ground and non-ground (classes 2 and 1 respectively).No adjustment to control was applied.LiDAR data was further classified to ICSM Level 3 specifications using TerraScan software.Ground classification involves either reclassifying points from or to the Ground class, so thatonly actual ground points were in the Ground class. This was done in with the point clouddisplayed in profile view and the terrain surface (TIN) and ortho-photography in plan view.In house software was developed to generate all of the LiDAR derived deliverables; theraster surfaces, intensity images and contours to ICSM specification. This process alsoperforms hydro-flattening using water line vectors.</SPAN></P><P><SPAN>The data were transformed from the ellipsoid to the ausgeoid09 datum using the GeoscienceAustralia N Surface.Rollei AIC Digital CameraThe Harrier 68i includes a Rollei AIC, 80 mega pixel medium format camera capable of 16bit RGB and colour infra-red modes. The specifications are as follows:Model: Rollei AICOperating altitude: 0 - 6,000 mField of view: 45 degrees or 60 degreesArray size: H68_017: 39 mega-pixel; H68_038: 80 mega-pixelChannels: Three (RGB)Bit depth: 16 bitMax. Exp. rate: 2.5 sec.Image pixel size: Down to 0.03 mImage scale: 1:250 to 1:10,000Position accuracy: Down to 0.03 mCalibration: Radiometric, Geometric5.0 Vertical Accuracy Assessment 5.1 Ground points validated against the elevation of the LiDAR. This assessment is derived from ground points collected by the contractor and validated against the elevation of the LiDARᶻ. Knownᶻ is taken from a known elevation height (Ground Survey) and LiDARᶻ is taken from the interpolated TIN aligned with the ground control point (Knownᶻ). Where available, independent ground control points are tested against the LiDAR, usually provided where available through a state government authority. Error Mean: -0.115 Error Range: [-0.181 - 0.057] Skew*: -0.426 RMSE(z): 0.119 NMAS/VMAS Accuracy(z) (90% CI) ±0.196 ASPRS/NSSDA Accuracy(z) (95% CI) ±0.233</SPAN></P><P><SPAN /></P></DIV></DIV></DIV> Murray Darling Basin Authority RPS Services Geoscience Australia <DIV STYLE="text-align:Left;"><DIV><P><SPAN>Creative Commons Attribution 3.0 Australia (CC BY 3.0AU) https://creativecommons.org/licenses/by/3.0/au</SPAN></P></DIV></DIV> Creative Commons Attribution 3.0 Australia (CC BY 3.0AU) https://creativecommons.org/licenses/by/3.0/au Version 6.2 (Build 9200) ; Esri ArcGIS 10.8.1.14362 ELEVATION_LOWER_DARLING_1M_DEM_2013_SFA201 1 141.559065 142.687332 -33.042816 -34.107016 DEM LIDAR ELEVATION LOWER DARLING 99722 1.000000 113720 1.000000 2 1 0 -2364.758300 6217369.983900 -2364.758300 6331089.983900 97357.241700 6331089.983900 97357.241700 6217369.983900 47496.241700 6274229.983900 Band_1 80.029999 27.145000 32 EPSG 8.9.4(10.5.0) 20210709 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