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Working with Point Clouds Understanding Point Clouds PowerPoint Presentation
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Working with Point Clouds Understanding Point Clouds

Working with Point Clouds Understanding Point Clouds

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Working with Point Clouds Understanding Point Clouds

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  1. Working with Point CloudsUnderstanding Point Clouds Overview • Allow us to display and use large point datasets • There is support for creating surfaces from Point Clouds • Point Clouds are supported in the core AutoCAD product

  2. Working with Point CloudsUnderstanding Point Clouds Point Clouds • Scanning is replacing some traditional point by point surveying • Data is richer • Tens of thousands of points collected per second • Detail greater • Some details even difficult for the eye to see • Details that weren’t in the original scope of work may be picked up

  3. Working with Point CloudsUnderstanding Point Clouds LiDAR – Light Detection and Ranging • Aerial –Using Aircraft • Low resolution • Uses Laser scanner • X,Y, Z, intensity • Digital Photography • 100s of millions of points

  4. Working with Point CloudsUnderstanding Point Clouds LiDAR – Light Detection and Ranging • Ground Based – Fixed scanner, typically on a tripod • Higher resolution • Uses Laser scanner • X,Y, Z, intensity • Digital Photography • 10s to 100s of millions of points • Surveyor sets up registration targets

  5. Working with Point CloudsUnderstanding Point Clouds LiDAR – Light Detection and Ranging • Mobile – Moving vehicle • Uses Laser scanner • X,Y, Z, intensity • Digital Photography • Millions to Billions of points

  6. Working with Point CloudsUnderstanding Point Clouds Other forms • Ground Penetrating Radar • Temperature Sensors • Pressure Sensors • Bathymetric Surveys

  7. Working with Point CloudsUnderstanding Point Clouds File formats • LAS (LiDAR standard) • X, Y, Z, intensity, classification • Intensity – materials, reflectiveness • Classification – ground, vegetation, buildings, water • DEM • GeoTIFF • SDTS • ESRI grid files

  8. Working with Point CloudsUnderstanding Point Clouds File formats • ASCII • Comma delimited, csv, etc. • Equipment Specific • Manufactures • Writes data faster

  9. Working with Point CloudsUnderstanding Point Clouds Civil 3D • Database • Indexed • View is driven by Civil 3D styles