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a. remke, s. wirtz, k. becker, o. gronz, m. seeger, j.b. ries€¦ · resolution: 2816 x 2112...

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  • A. Remke, S. Wirtz, K. Becker, O. Gronz, M. Seeger, J.B. Ries€¦ · Resolution: 2816 x 2112 Sensor: 1/2.5 “ (5.76 x 4.3 mm) CCD: 6 MPX Focal Length: 38-116 mm Used Camera Used
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A. Remke, S. Wirtz, K. Becker, O. Gronz, M. Seeger, J.B. Ries Dept. of Physical Geography, Trier University, Germany; Comparison of two different terrestrial photography-methods in rill erosion research Contact: Dr. Stefan Wirtz; Department of Physical Geography, Trier University; Behringstraße, 54286 Trier, Germany; Phone: +49 / (0)651 201-3390; E-mail: [email protected] Method 1 Method 2 Advantages • Easy handling in the field • Overhangs in sidewalls detectable • Lower data quantity • Result‘s quality in general Disadvantages • Bulky data quantity • Result‘s quality in general • More complicated in the field • Overhangs not detectable Introduction Method 1: Free-hand Photographies Method 2: Stereo Photographies Study Area Results Conclusion Method 1, Latxaga, segment of approx. 1.5m Field Energy Supply Chain Used Camera (2x) Used Software Nikon Coolpix L2 Resolution: 2816 x 2112 Sensor: 1/2.5 “ (5.76 x 4.3 mm) CCD: 6 MPX Focal Length: 38-116 mm Used Camera Used Software Nikon D80 Resolution: 3872 x 2592 Sensor: 23.6 x 15.8 mm CCD: 10.75 MPX AF-S DX Nikkor 18-70 Focal Length: 18-70 mm, Latxaga La Tejería Geology Clay marls Grey marls Marls Sandstones Climate PRECIP: 835 mm a -1 Ø Temp.: 12° C PRECIP: 725 mm a -1 Ø Temp.: 13° C Texture Silty-clay-loam Clayey-silty Land Use agricultural agricultural Area 207 ha 169 ha Latxaga La Tejería • Important task in rill erosion research: Detecting differences in rills before and after a natural or experimental runoff event volume and sources of eroded material • Precondition: accurate 3-D model of the rill before and after runoff • Typical method for 3-D surface modelling: terrestrial laser scanning • Disadvantage: highly expensive • Alternative, budget friendly option: terrestrial photography • Presented here: comparison of two different methods Casalí et al. (2008): Runoff, erosion, and water quality of agricultural watersheds in central Navarre (Spain); Agricultural Water Management 95: 1111 – 1128 Best result: Combination of the image sets from both methods, Problem: bulky data quantity Method 1&2: Latxaga, segment of approx. 2.5m Camera Positions for one complete Rill (approx. 20m) Camera 1 Camera 2 Technical Setup Future: Double Stereo Photography Overhangs detectable without bulky data quantity Camera 1 Camera 2 Camera 4 Camera 3 Method 2: Latxaga, segment of approx. 2.5m Method 1, La Tejería, segment of approx. 2m Method 2, La Tejería, segment of approx. 2m Method 1&2, La Tejería, segment of approx. 2m

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  • A. Remke, S. Wirtz, K. Becker, O. Gronz, M. Seeger, J.B. Ries

    Dept. of Physical Geography, Trier University, Germany;

    Comparison of two different terrestrial photography-methods in rill erosion research

    Contact: Dr. Stefan Wirtz; Department of Physical Geography, Trier University; Behringstraße, 54286 Trier, Germany; Phone: +49 / (0)651 201-3390; E-mail: [email protected]

    Method 1 Method 2

    Advantages

    • Easy handling in the

    field

    • Overhangs in

    sidewalls detectable

    • Lower data quantity

    • Result‘s quality in

    general

    Disadvantages

    • Bulky data quantity

    • Result‘s quality in

    general

    • More complicated in

    the field

    • Overhangs not

    detectable

    Introduction Method 1: Free-hand Photographies Method 2: Stereo Photographies

    Study Area

    Results Conclusion

    Method 1, Latxaga, segment of approx. 1.5m

    Field Energy

    Supply Chain

    Used Camera (2x)

    Used Software

    Nikon Coolpix L2

    Resolution: 2816 x 2112

    Sensor: 1/2.5 “ (5.76 x 4.3 mm)

    CCD: 6 MPX

    Focal Length: 38-116 mm

    Used

    Camera

    Used

    Software

    Nikon D80

    Resolution: 3872 x 2592

    Sensor: 23.6 x 15.8 mm

    CCD: 10.75 MPX

    AF-S DX Nikkor 18-70

    Focal Length: 18-70 mm,

    Latxaga La Tejería

    Geology Clay marls

    Grey marls

    Marls

    Sandstones

    Climate PRECIP:

    835 mm a-1

    Ø Temp.: 12° C

    PRECIP:

    725 mm a-1

    Ø Temp.: 13° C

    Texture Silty-clay-loam

    Clayey-silty

    Land Use agricultural agricultural

    Area 207 ha 169 ha

    Latxaga

    La Tejería

    • Important task in rill erosion research: Detecting differences in rills before and after

    a natural or experimental runoff event volume and sources of eroded material

    • Precondition: accurate 3-D model of the rill before and after runoff

    • Typical method for 3-D surface modelling: terrestrial laser scanning

    • Disadvantage: highly expensive

    • Alternative, budget friendly option: terrestrial photography

    • Presented here: comparison of two different methods

    Casalí et al. (2008): Runoff, erosion, and water quality of agricultural watersheds

    in central Navarre (Spain); Agricultural Water Management 95: 1111 – 1128

    Best result: Combination of the image sets from both methods,

    Problem: bulky data quantity

    Method 1&2: Latxaga, segment of approx. 2.5m

    Camera Positions for one complete Rill (approx. 20m)

    Camera 1 Camera 2

    Tec

    hnic

    al S

    etup

    Future:

    Double Stereo

    Photography

    Overhangs

    detectable without

    bulky data quantity

    Camera 1 Camera 2

    Camera 4 Camera 3

    Method 2: Latxaga, segment of approx. 2.5m

    Method 1, La Tejería, segment of approx. 2m

    Method 2, La Tejería, segment of approx. 2m

    Method 1&2, La Tejería, segment of approx. 2m


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