Traditional Photogrammetry vs. LiDAR

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Traditional Photogrammetry vs. LiDAR
Complementary characteristics suggest
integration
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What are some of the LIDAR data products
available?

• Digital Ortho-Rectified Imagery
• Some LiDAR providers collect digital color or
  black-and-white ortho-rectified imagery
  simultaneously with the collection of point data.
  Imagery is collected either from digital cameras
  or digital video cameras and can be mosaiced.
  Resolution is typically 1m.
• Intensity Return Images
• Images may be derived from intensity values
  returned by each laser pulse. The intensity
  values can be displayed as a gray scale image.
• LIDAR Derived Products
• Topographic LiDAR systems produce surface
  elevation x, y, z coordinate data points. There
  are many products that can be derived from raw
  point data. Most LiDAR providers can derive these
  products upon request
• Digital Elevation Models (DEMs)
• Digital Terrain Models (DTMs) (bald-earth
  elevation data)
• Triangulated Irregular Networks (TINs)
• Breaklines - a line representing a feature that
  you wish to preserve in a TIN (example stream or
  ridge)
• Contours
• Shaded Relief
• Slope Aspect

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Intensity Image

• Commonly unused bi-product of a LiDAR acquisition
  and is the intensity of object that the laser
  pulse is striking. This is an uncalibrated 8-bit
  (0-255) image that is ortho-rectified as
  therefore can be used as an orthophoto
• Not typically used in quantitative analysis as
  image gains always set to 'adaptive gain' setting
  when images are acquired

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http//www.sbgmaps.com/lidar.htm
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http//ilmbwww.gov.bc.ca/bmgs/pba/trim/specs/LiDAR
Specifications ver 0.5.pdf
Intensity images. Similar in appearance to
low-resolution photographs, georeferenced lidar
intensity images can be used to extract
planimetric features and serve as ancillary input
for lidar data processing. Intensity images also
are used to check the horizontal accuracy of the
lidar data and other criteria.
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Digital photogrammetry applicationshttp//www.gi
sdevelopment.net/proceedings/mapmiddleeast/2007/te
chnology/3DVisualisation/mme07_Malmberg.pdf
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Digital photogrammetry software
http//www.cardinalsystems.net/vrtwo.htm
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http//ilmbwww.gov.bc.ca/bmgs/airphoto/specs/DIGIT
AL_AERIAL_PHOTOGRAPHIC_IMAGES_SPECS_05022008.pdf
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Terrasaurus, Williams Lake http//terrasaurus.ca/
terrasaurus/about.html
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Selkirk Remote Sensing ltd, Richmond
BChttp//www.selkirk.com/NewPhotography.php
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http//apps.ecy.wa.gov/shorephotos/
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LiDAR applications
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http//www.gisdevelopment.net/proceedings/mapmiddl
eeast/2007/technology/3DVisualisation/mme07_Malmbe
rg.pdf
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Representing the relief of Orienteering maps with
the aid of airborne laser scanning
Höhendarstellung in OL-Karten mithilfe von
Airborne Laser-Scanning
Thomas Hohl Gymnasium Kirschgarten Basel
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LIDAR basemaps for Orineteering
http//www.lidarbasemaps.org/
Hill shading
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O-map with hill shading
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Map hill slope
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LiDAR and digital aerial photographyhttp//pugets
oundlidar.ess.washington.edu/example1.htm
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