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Applying close range digital photogrammetry in soil erosion studies

Research output: Contribution to journalJournal article

Published

Journal publication date09/2010
JournalPhotogrammetric record
Journal number131
Volume25
Number of pages26
Pages240-265
Original languageEnglish

Conference

ConferenceAnnual Conference of the Remote-Sensing-and-Photogrammetry-Society (RSPSoc 2009)
CityLeicester
Period8/09/0911/09/09

Abstract

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.