| snippet:
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20cm RGB Imagery captured as part of the Lower darling DEM project. This data covers a gap between two datasets, one to the north covering the Menindee Lakes... |
| summary:
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20cm RGB Imagery captured as part of the Lower darling DEM project. This data covers a gap between two datasets, one to the north covering the Menindee Lakes... |
| accessInformation:
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Murray Darling Basin Authority RPS Services
Geoscience Australia |
| thumbnail:
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thumbnail/thumbnail.png |
| typeKeywords:
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["Data","Service","Image Service","ArcGIS Server"] |
| description:
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Medium format digital photography was captured using the Rollie TAC AICPro camera that is integrated within the Harrier 68 Airborne LiDAR System. The images were oriented using reduced best fit trajectory from the IMU and differentially processed airborne GPS. The images were ortho-rectified against the LiDAR 1 metre DEM and automatically colour balanced and mosaiced. The ortho-photomosaic was exported to ECW and 1km x 1km tiles in GeoTIFF The photography was captured simultaneously with the LiDAR whenever conditions were suitable for LiDAR capture. As a consequence, the imagery may be affected by cloud shadow (but will not include actual clouds) and low sun angles (i.e. long shadows). The ortho-mosaic is a seamless mosaic of photogrammetric quality and no manual colour matching or manual editing of seam lines has been applied. </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>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 /></P></DIV></DIV></DIV> |
| licenseInfo:
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<DIV STYLE="text-align:Left;"><DIV><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></DIV> |
| catalogPath:
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| title:
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IMAGERY_LOWER_DARLING_20CM_RGB_2013_SFA201 |
| type:
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Image Service |
| url:
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https://mdbadmzgisimg01.dmz.prod.local:6443/arcgis/services/IMAGERY/IMAGERY_LOWER_DARLING_20CM_RGB_2013_SFA201/ImageServer |
| tags:
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["IMAGERY","ELEVATION","LOWER","DARLING"] |
| culture:
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en-US |
| name:
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IMAGERY_LOWER_DARLING_20CM_RGB_2013_SFA201 |
| guid:
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| spatialReference:
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GDA2020_MGA_Zone_55 |