Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Applying close range digital photogrammetry in soil erosion studies
AU - Heng, B. C. Peter
AU - Chandler, Jim H.
AU - Armstrong, Alona
PY - 2010/9
Y1 - 2010/9
N2 - Soil erosion due to rainfall and overland flow is a significant environmental problem. Studying the phenomenon requires accurate high-resolution measurements of soil surface topography and morphology. Close range digital photogrammetry with an oblique convergent configuration is proposed in this paper as a useful technique for such measurements, in the context of a flume-scale experimental study. The precision of the technique is assessed by comparing triangulation solutions and the resulting DEMs with varying tie point distributions and control point measurements, as well as by comparing DEMs extracted from different images of the same surface. Independent measurements were acquired using a terrestrial laser scanner for comparison with a DEM derived from photogrammetry. The results point to the need for a stronger geometric configuration to improve precision. They also suggest that the camera lens models were not fully adequate for the large object depths in this study. Nevertheless, the photogrammetric output can provide useful topographical information for soil erosion studies, provided limitations of the technique are duly considered.
AB - Soil erosion due to rainfall and overland flow is a significant environmental problem. Studying the phenomenon requires accurate high-resolution measurements of soil surface topography and morphology. Close range digital photogrammetry with an oblique convergent configuration is proposed in this paper as a useful technique for such measurements, in the context of a flume-scale experimental study. The precision of the technique is assessed by comparing triangulation solutions and the resulting DEMs with varying tie point distributions and control point measurements, as well as by comparing DEMs extracted from different images of the same surface. Independent measurements were acquired using a terrestrial laser scanner for comparison with a DEM derived from photogrammetry. The results point to the need for a stronger geometric configuration to improve precision. They also suggest that the camera lens models were not fully adequate for the large object depths in this study. Nevertheless, the photogrammetric output can provide useful topographical information for soil erosion studies, provided limitations of the technique are duly considered.
KW - precision
KW - SURFACE REPRESENTATION
KW - MICRORELIEF
KW - close range digital photogrammetry
KW - RUNOFF
KW - CALIBRATION
KW - CAMERAS
KW - soil surface measurement
KW - morphology
KW - VARIABILITY
KW - RAINFALL
KW - ROUGHNESS
KW - MODELS
KW - dome effects
KW - oblique imagery
KW - DISTORTION
U2 - 10.1111/j.1477-9730.2010.00584.x
DO - 10.1111/j.1477-9730.2010.00584.x
M3 - Journal article
VL - 25
SP - 240
EP - 265
JO - The Photogrammetric Record
JF - The Photogrammetric Record
SN - 0031-868X
IS - 131
T2 - Annual Conference of the Remote-Sensing-and-Photogrammetry-Society (RSPSoc 2009)
Y2 - 8 September 2009 through 11 September 2009
ER -