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Bill Emison

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Bill Emison – PowerPoint PPT presentation

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Title: Bill Emison


1
South Carolina LiDAR Partnership Workshop
  • Presented By
  • Bill Emison
  • MARS Product Manager
  • April 8, 2008

2
Merrick Company
  • Corporate headquarters Aurora, Colorado
  • Founded in 1955, incorporated in 1959
  • Primary Services
  • Architecture
  • Civil Engineering
  • Facilities Engineering
  • GeoSpatial Solutions
  • Process Engineering
  • 450 employees at 8 national intl offices
  • Annual revenue gt 60M
  • Ownership Private (employee-owned)

3
Instructor
  • Bill Emison
  • MARS Product Manager (GSS)
  • GIS professional since 1993.
  • Professional experience includes consulting,
    software sales and technical marketing.
  • B.S., Business Administration, Univ. of
    Louisville, Louisville, KY, 1991.
  • M.S., City Planning (GIS), Georgia Institute of
    Technology, Atlanta, GA, 1997.

4
Workshop Objective
  • Provide an objective review of LiDAR data
    processing methodologies within the framework of
    airborne data collection.
  • Educate and evangelize the benefits of airborne
    remote sensing, especially as it pertains to
    LiDAR and the integration of full-spectrum sensor
    technologies

5
LiDAR Derived Products
  • Digital surface model (DSM)
  • Elevation model including vegetation, buildings
    and objects
  • Digital terrain model (DTM)
  • Elevation model without buildings and vegetation
  • Digital elevation model (DEM)
  • Triangulated Irregular Network (TIN)
  • Contour lines
  • Hillshades
  • Grids (elevation, intensity)
  • Volume calculations
  • Data classes (post-filtering)
  • Cross-section information
  • Breaklines

6
Data Visualization
7
MARS Visualization
  • Render LiDAR by
  • Elevation
  • Intensity
  • Classification
  • Flight line
  • Return
  • Imagery (fusion)

8
MARS Visualization
  • LiDAR point cloud (raw data)
  • TIN
  • 2D (orthographic)
  • 3D (perspective)
  • Cross-Section View

9
Supported Imagery Formats
  • ECW (ER Mapper/Leica)
  • Hyperspectral (ENVI)
  • GDAL (raster translator library)
  • JPEG 2000
  • TIFF/TFW
  • ERDAS Image (.IMG)
  • MrSID
  • NITF

10
Hyperspectral Imagery
  • MARS now supports the ENVI data format, which
    allows the user to load, render and analyze
    hyperspectral datasets.
  • Users can select the hyperspectral data layer to
    render, based on its classification attribute.

11
Supported Vector Formats
  • ESRI SHP (native)
  • MARS GeoTranslate
  • AutoCAD (DXF, DWG)
  • ESRI Shapefile (SHP)
  • MapInfo (MIF, TAB)
  • Bentley Microstation (DGN)
  • Microsoft Excel (XLS)

12
Reference Data
  • Ground Control/Survey Points (CSV)
  • Tile Scheme(s)
  • LiDAR
  • Orthophotography
  • Reference Vector Data
  • Breaklines
  • Boundary Files
  • Building Footprints

13
Data Management
14
MARS Data Management Tools
  • Data Import/Export
  • X, Y, Z Transforms
  • LiDAR QA/QC Tools
  • 3-D Coordinate Transformation
  • 2-D Capture Tool
  • Planimetric Capture Tool

15
Supported Data Import Formats
  • ASCII (Text)
  • Terrascan Binary (.BIN)
  • ESRI Float Grid (.FLT)
  • DTH Grid (.DTH)

16
Supported Data Export Formats
  • LAS
  • Data Classes (post-filtering)
  • ASCII (Text)
  • Grids (Elevation or Intensity)
  • ESRI Float Grid
  • ASCII Grid
  • DTH Grid
  • Topography (SHP, DGN)
  • Cross-Section Data (SHP)
  • Breaklines (SHP, DGN)
  • ENVI (Elevation or Classification)
  • Shapefile (points)
  • Intensity Image (TIFF Grid)

17
LiDAR QA/QC Tools
  • Control Point Report
  • Allows users to compare derived ground surface to
    control points
  • LAS Statistics Tool
  • Generates statistics about LAS points
  • Profile/Cross-Section Analysis
  • Allows users to visually inspect the coincidence
    of flight line information
  • Contour by Flight Line
  • Allows users to visually inspect the coincidence
    of contours between flight lines

18
3-D Coordinate Transformation
19
MARS GeoCalc Dialog
MARS GeoCalc allows the user to reproject LAS
data to different horizontal vertical
coordinate systems. This tool can support batch
processing for an unlimited number of LAS files.
20
Vector Translation
  • MARS GeoTranslate allows the user to shift
    vector data to different Horizontal Coordinate
    Systems and Horizontal and Vertical datum's. This
    tool also allows the user to write the
    reprojected vector files to another file format.
  • Supported Vector File Formats
  • AutoCAD (DXF, DWG)
  • ESRI Shapefile (SHP)
  • MapInfo (MIF, TAB)
  • Bentley Microstation (DGN)
  • Microsoft Excel (XLS)

21
MARS GeoTranslate Dialog
22
Custom Coordinate System Definition
  • MARS GeoEdit allows the user to shift vector
    data to different Horizontal Coordinate Systems
    and Horizontal and Vertical datum's. This tool
    also allows the user to write the reprojected
    vector files to another file format.

23
2-D Capture Tools
  • The 2-D capture tool allows users to draw linear
    vector features (ex. road edges) that can be
    draped to a surface, and then written to a 3-D
    shapefile.
  • Commonly used to drape transects onto the derived
    ground surface model for hydrographic modeling.

24
Planimetric Capture Tools
  • The Planimetric Capture tool is used for
    planimetric data capture directly from LiDAR or
    elevation data. The tool is designed to square
    off features at 45 or 90 degrees for ease,
    speed and accuracy of capture.
  • Initial tool to generate complex 3-D building
    objects (ex. roof lines) for visualization and
    modeling.

25
Data Generation
26
Derivative Data Products
  • LAS
  • Grids
  • ASCII (text)
  • Shapefiles
  • Contours
  • Breaklines
  • Hillshades
  • Rectifed snapshots

27
MARS Contour Options
  • User-defined contour parameters
  • Contour interval
  • Index contours
  • Minimum contour length
  • Contour by flight line
  • Included classifications for contour generation
  • Contour export to SHP and DGN

28
Contour Depression Coder
  • Automates the coding of contour depressions

29
Breakline Compilation
30
Definition
  • Breaklines are linear features that describe a
    change in continuity of a surface.
  • Breaklines are typically captured along road
    edges and hydrographic features to assist with
    the accurate depiction of contours.

31
Why do I need breaklines?
32
Future Trends
33
Future Trends in Remote Sensing
  • Multi-Sensor Fusion Simultaneous data
    collection featuring LiDAR, hyperspectral/multispe
    ctral, thermal and high-resolution imagery
    sensors
  • Real-time data collection and processing for
    military, defense and homeland security
    applications
  • UAV sensor platform development
  • All digital workflow!
  • Automated change detection
  • Integration of airborne terrestrial point clouds

34
MARS Software Downloads
  • MARS FreeView (free viewer)
  • MARS Explorer (30 day evaluation version)
  • http//www.merrick.com/servicelines/gis/marsdemo
    setup.aspx

International LiDAR Mapping Forum (ILMF) Feb.
2009 www.lidarmap.org
35
Software Demonstration
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