14 Construction Surveying

14 Construction Surveying - New/Advanced Technology in...

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New/Advanced Technology in Surveying CE 111
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New/Advanced Technology Photogrammetry LiDAR GIS
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Photogrammetry
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Engineering/Topographic Mapping For most engineering applications, topographic data is collected through: Ground survey methods Total Stations GPS Aerial methods Combination of these methods
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Photogrammetry Photogrammetry is the art, science, and technology of obtaining reliable information from imagery. Two major areas of specialization Metrical Determining spatial information » Distances, elevations, areas, volumes, cross sections, cartographic data, etc. Interpretative Recognizing objects from their photographic images and judging their significance
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Photogrammetry Historically, the main uses for photogrammetry has been to support civil/construction engineering projects. – Much of the nation's infrastructure (interstate highways, dams, water and sanitary systems, airports, buildings, etc.) have been designed using a photogrammetrically compiled land base. Its civil/construction engineering upbringing has demanded high positional (or geodetic) accuracy.
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Photogrammetry Photogrammetry is now the principle method used in topographic mapping and compiling other forms of spatial data Advantages: High accuracy Speed in collecting data Relatively low cost Ease of obtaining topographic details
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Photogrammetry A technique of measuring objects from imagery Photographs Imagery stored electronically Taken by video, cameras, sensors, or scanners.
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Aerial Cameras Are either film or digital type Are calibrated to get precise values for the focal length and lens distortion Flatness of the focal plane Relative position of the principal point Fiducial mark locations
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14 Construction Surveying - New/Advanced Technology in...

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