LiDAR Aided Decision Making
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Transcript of LiDAR Aided Decision Making
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing.
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LiDAR Aiding Decision-Making Process September 16th, 2009GIS in The Rockies
Presented by: Jamie Young General Manager – LiDAR services
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 2
LiDAR DecisionsNational Research Council of the National Academies
• “LiDAR produces very-high-resolution three-dimensional point clouds in a wide variety of land cover types at accuracies equivalent to or better than photogrammetry…”
• “LiDAR can be acquired day or night, in cloudy conditions, leaf on or leaf off and no sun angle limitation…”
• “LiDAR is able to penetrate to the bare earth in vegetated area better than either IFSAR or photogrammetry…”
• “LiDAR data processing and feature extraction can be incorporated seamlessly into the production environment designed for photogrammetry…”
Hydro-electric dam, Puerto Rico
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 3
LiDAR Accuracy StandardsWhat should you know?
• Horizontal: the positional accuracy of a dataset with respect to a horizontal reference.
• Vertical: the vertical accuracy of a dataset with respect to a horizontal reference.
• Positional: the position of features, including horizontal and/or vertical position.
• Relative: value in feet or meters that reports the uncertainty in vertical or horizontal position due to random errors in measurements in a location relative to any other point.
• Absolute: value in feet or meters that reports uncertainty in vertical or horizontal positions due to systematic & random errors in measurements of the location of any point on a geospatial dataset relative to the defined vertical or horizontal datum at a state confidence level. a location relative to any other point.
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 4
Application vs. Accuracy and Point Density
Vs.
Vs.
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 5
LiDAR Uses
• Flood plain Mapping – Hydrologic Modifications– Update FIRM to DFIRM from LiDAR– Flow Analysis– Impervious surface analysis– Storm water analysis
• Transportation Infrastructure• Dam Management
– Dam Breach Analysis
• Soils Mapping • Emergency management• Construction Design• Line of Sight
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 6
LiDAR Uses
• Forestry, Biomass, &Vegetation Management• HCA and facility Management• 3-D modeling
– Building extract
– Change detection
– Updating assessor database
– Building Foot Prints
– Other man-made extraction
• Security Management• Volumetric studies• Utility mapping• Reclamation projects
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 7
LiDAR of Bridge at 0.3 meter collection
LiDAR of Mile High Stadium
LiDAR ApplicationsSecurity Management
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 8
LiDAR Uses
• Breakline generation• Contour generation• Terrain model generation
– DEM, DTM, DSM
• Tree Canopy Analysis• Land Development• Erosion Studies• Geologic studies• Aviation safety• High Level Land Cover• Ortho DEM
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 9
Contour Representation Filtered vs. Enhanced
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 10
Contour and Orthorectification Generation Filtered Bare Earth LiDAR & LiDAR DEM
Bare earth surface model Contours draped on surface Contours
Photography draped over LiDAR data
Contours draped over orthophotography
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 11
LiDAR Processing LiDARgrammetry
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 12
Hydro Breakline Collection Process (LiDARgrammetry)
– LIDAR Bald Earth DTM Supplemented with Breaklines
– Stereoscopic measurement
– 3D breaklines• Support FDEM
• Water Body
• Linear Hydrographic
• Coastal Shorelines
• Road (EOP)
• Overpasses and Bridges
• Soft Features
• Islands
• Obscured Areas (vegetation)
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 13
LiDARgrammetryContour Interpolation (1.0’)
– LIDAR Bald Earth GRID with Breaklines
• NMAS• Correctly depict the terrain• Smoothing• Contiguous
– Topology • Validated within the geodatabase• edge-match at the correct z-
elevation to neighboring counties• Proper Coding• Non-intersecting• Dangles
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 14
Imagery with LiDARDSS 39 MP RGB
39 Mega- pixel RGBImage
Registered to LIDAR
Collected at same Time as LiDAR
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 15
Imagery with LiDARDSS 39 MP IR
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 16
BuildingsAutomated Polygons
•Automated generationOf building wire frame
•Automated generationOf building Polygons
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 17
Extraction of Buildings and Man-Made Features
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 18
LiDAR Application TrendsChange Detection
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 19
GeomorphologyRed relief improves what you can see
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 20
LiDAR DeliverablesHow should you receive your data?
• LiDAR formats – LAS– Ascii - can include x,y,z and any other LAS attributes– ESRI Shapefile
• Raster DEM formats ("regular" spacing/gridded)– Tiff– Arc Binary GRID (a.k.a. ArcInfo Lattice)– Arc Ascii GRID– ERDAS img
• Imagery– Intensity images (any raster format)– Variety of types of rendering - hillshade, slope, aspect, etc.
• Contours– GIS formats (e.g. ESRI Shapefile, ESRI Personal Geodatabase)– CAD formats (e.g. DXF, DGN, DWG)
• Breakline/planimetric data – GIS formats (e.g. ESRI Shapefile, ESRI Personal Geodatabase)– CAD formats (e.g. DXF, DGN, DWG)
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 21
LiDAR Server
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 22
LiDAR Server
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 23
LiDAR Server and Google
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 24
• Provides on-the-fly rendering capabilities directly from LAS point cloud.– TIN surfaces
– Contours
– Profile
Eliminates the need to create, store, and manage derivates.
• LAS file delivery to desktop• Easily customizable through XML and client side applications
LiDAR Server
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing. 25
LiDAR BLOGSubmit any question about LiDAR
http://LidarBlog.wordpress.com
© 2007, The Sanborn Map Company, Inc. Privileged and confidential information.Distribution or copying prohibited unless approved in writing.
Thank You! and Questions
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