using lidar to obtain manhole elevation - amazon s3 · using lidar to obtain manhole elevation...
TRANSCRIPT
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Using LiDAR to Obtain Manhole ElevationPresented by Lixin Huang, Brevard County, BoCC
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IntroductionAccurate manhole elevation data are critical to modeling utility network. Getting manhole elevation is a labor intensive task. ◦ Traditional survey (high accuracy)◦ GPS (varying accuracy)
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LiDAR (Light Detection And Ranging)
High accuracy (up to half foot)High efficiency
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Get Manhole Elevation by LiDARObtain LiDAR dataProcess LiDAR dataExtract manhole elevationVerify manhole elevation
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Obtain LiDAR Data
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Get Manhole Elevation by LiDARObtain LiDAR dataProcess LiDAR dataExtract manhole elevationVerify manhole elevation
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Process LiDAR DataUse ArcGIS 3D Analyst tools to generate◦ DSM (Digital Surface Model)
First Return
◦ DEM (Digital Elevation Model)Bare Earth
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Process LIDAR Data (Continued)
DSM
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Process LIDAR Data (Continued)
DEM
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Get Manhole Elevation by LiDARObtain LiDAR dataProcess LiDAR dataExtract manhole elevationVerify manhole elevation
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Extract Manhole ElevationUse ArcGIS Spatial Analyst tools to extract manhole elevation from DEM
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Get Manhole Elevation by LiDARObtain LiDAR dataProcess LiDAR dataExtract manhole elevationVerify manhole elevation
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Verify Manhole Elevation
Use ArcGIS Spatial Analyst tools to extract manhole elevation from DSMCompare the elevations from DEM to DSM for each manholeIdentify the manholes with larger elevation difference and select some manholes randomlyVerify the selected manhole elevations with field data.
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Verify Manhole Elevation (Continued)
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Verify Manhole Elevation (Continued)
DSM Aerial
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Verify Manhole Elevation (Continued)
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SummaryGetting manhole elevation by LiDAR◦ Efficient◦ Accurate◦ Not labor intensive
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Questions