Rapid orthophoto development system.
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Rapid orthophoto development system.

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  • Abstract:
    The DMC system procured in the project represented state-of-the-art, large-format digital aerial camera systems at the start of

    project. DMC is based on the frame camera model, and to achieve large ground coverage with high spatial resolution, the

    output image is formed from four independent images acquired by four cameras. DMC procured for OCMS was carefully

    tested to assess its performance level. From test flights by ODOT, three different blocks were selected, representing different

    flying condition and flight geometry. Five methods were used for the performance evaluation, including two methods where

    self-calibration was also introduced. The analysis of the results confirmed that the DMC meets the manufacturer’s

    specification. To maintain consistent performance in normal operations, periodical calibration flights and the use of ground

    controls as check points is highly recommended. In addition to further support QA/QC, the use of automated aerial

    triangulation is also suggested.

    The main product of the ODOT Office of Mapping and CADD Services is orthophoto, which is widely used in many

    applications at ODOT and other State offices. Since ODOT primarily acquires data over the transportation network, the

    orthophoto production has some specific needs, such as dealing with bridges and occlusions, besides the general tasks of

    the orthoimage workflow. In this project, an innovative method was developed to support the orthoimage generation at

    bridges. The concept is built around the development of a precise bridge model, which is formed from the DMC imagery and

    LiDAR data. In addition, a true orthophoto generation process was implemented. The initial versions of both software tools

    installed at Office of CADD and Mapping Services for testing provided valuable feedback for algorithmic refinements.

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