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Using Commercial-Grade Digital Camera Images in the Estimation of Hydraulic Flume Bed Changes: Case Study

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Abstract:

A methodology for utilizing commercial-grade digital camera images, surveying measurements, and digital photogrammetry techniques to substitute traditional measurement methods for creating a digital elevation model (DEM) of hydraulic flume bed was developed and tested. A Sony DSC T9 camera, Sokkia set3 total stations, and Leica Photogrammetry Suite software were used. Two different image resolutions were tested for two cases of the hydraulic flume bed representing initial and posthydraulic test cases. The DEMs were compared with the ones created using manual measurements, using a steel ruler for the initial case. The developed methodology provided a reliable and cost-effective alternative to traditional methods for medium- to low-accuracy applications. A maximum of 12-mm elevation RMSE was obtained for the check points in the initial case. The corresponding RMSE for the posthydraulic test case was 10 mm. No significant gain in obtained accuracy was achieved when higher-resolution images were used. Absolute values of the differences between the DEMs created using six- and three-megapixel-resolution image sets for the initial and post-hydraulic test cases were less than 2 cm for 80 percent and 86 percent of the pixels, respectively. This percentage increases to above 90 percent if the difference threshold is increased to 3 cm. The differences between photogrammetry derived DEMs and manually collected data were less than 2 cm for 71 percent of the DEM pixels and less than 3 cm for 90 percent of the pixels.

Keywords: AMATEUR CAMERA; DIGITAL ELEVATION MODEL; DIGITAL PHOTOGRAMMETRY; HYDRAULIC FLUME

Document Type: Research Article

Publication date: March 1, 2008

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  • Surveying and Land Information Science (SaLIS) is the official publication of the American Association of Geodetic Surveying (AAGS) and the Geographic and Land Information Society (GLIS).

    SaLIS is a scientific journal devoted to reporting research and new work conducted to advance geodetic surveying, land surveying, large-scale mapping, and geographic information systems designed to advance the development and management of the cadastral parcel data layer and other land information applications. SaLIS publishes research articles, technical papers, technical notes, papers on the current state of surveying education, surveying history, book reviews, and current literature reviews. Every four years, the journal publishes the U.S. Report to the International Federation of Surveyors (FIG). The Proceedings of the Surveying Teachers Conference are published bi-annually.

    For information about AAGS visit www.aagsmo.org
    For information about GLIS visit www.g-lis.org

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