The normalized topographic method: an automated procedure for gully mapping using GIS

Castillo, Carlos; Taguas, E. V.; Zarco‐Tejada, Pablo J.; James, Michael; Gómez, José A.

doi:10.1002/esp.3595

Cited by 59 publications

(43 citation statements)

References 24 publications

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“…SfM has become a well‐established method in geomorphology that refers to a wide range of computer vision techniques, which have been applied to photogrammetry (see Smith et al, for review). Here, we use the software Pix4D that has been previously been applied in geomorphological studies by Castillo et al () and Eltner et al (). The basic difference with classical photogrammetry is that the analysis commences with the application of automatic stereo‐matching algorithms using computer vision techniques to an unstructured set of images.…”

Section: Methodsmentioning

confidence: 99%

Archival photogrammetric analysis of river–floodplain systems using Structure from Motion (SfM) methods

Bakker

Lane

2016

Earth Surf Processes Landf

106

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In this study we evaluate the extent to which accurate topographic data can be obtained by applying Structure from Motion (SfM) photogrammetric methods to archival imagery. While SfM has proven valuable in photogrammetric applications using specially acquired imagery (e.g. from unmanned aerial vehicles), it also has the potential to improve the precision of topographic data and the ease with which can be produced from historical imagery. We evaluate the application of SfM to a relatively extreme case, one of low relative relief: a braided river–floodplain system. We compared the bundle adjustments of SfM and classical photogrammetric methods, applied to eight dates. The SfM approach resulted in data quality similar to the classical approach, although the lens parameter values (e.g. focal length) recovered in the SfM process were not necessarily the same as their calibrated equivalents. Analysis showed that image texture and image overlap/configuration were critical drivers in the tie‐point generation which impacted bundle adjustment quality. Working with archival imagery also illustrated the general need for the thorough understanding and careful application of (commercial) SfM software packages. As with classical methods, the propagation of (random) error in the estimation of lens and exterior orientation parameters using SfM methods may lead to inherent systematic error in the derived point clouds. We have shown that linear errors may be accounted for by point cloud registration based on a reference dataset, which is vital for the further application in quantitative morphological analyses when using archival imagery. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Methodsmentioning

confidence: 99%

Archival photogrammetric analysis of river–floodplain systems using Structure from Motion (SfM) methods

Bakker

Lane

2016

Earth Surf Processes Landf

106

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“…Hence, there is a need to examine the effect of scale on the spatial variation of loess deposition in relation to paleotopography. With the development of the multiple data source acquisition and digital terrain analysis method (Geomorphometry; Evans, 2012), it is possible to reconstruct pre-existing underlying paleotopography (Alexander et al, 2008;Campani et al, 2012;Perron and Fagherazzi, 2012;Castillo et al, 2014;Xiong et al, 2014c;Bergonse and Reis, 2015). A comparative analysis of both dual-layer terrains, including modern terrain and paleotopography, could help to reveal the landform evolution process.…”

Section: Introductionmentioning

confidence: 99%

Paleotopographic controls on loess deposition in the Loess Plateau of China

Xiong

Tang

Strobl

et al. 2016

Earth Surf Processes Landf

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The underlying pre‐existing paleotopography directly influences the loess deposition process and shapes the morphology of current loess landforms. An understanding of the controlling effects of the underlying paleotopography on loess deposition is critical to revealing the mechanism of loess‐landform formation. However, these controlling effects exhibit spatial variation as well as uncertainty, depending on a study's data sources, methodologies and particular research scope. In this study, the geological history of a study area in the Loess Plateau of China that is subject to severe soil erosion is investigated using detailed geological information and digital elevation models (DEMs), and an underlying paleotopographic model of the area is constructed. Based on the models of modern terrain and paleotopography, we introduce a watershed hierarchy method to investigate the spatial variation of the loess‐landform inheritance relationship and reveal the loess deposition process over different scales of drainage. The landform inheritance relationships were characterized using a terrain‐relief change index (TRCI) and a bedrock terrain controllability index (BTCI). The results show that the TRCI appears to have an inverse relationship with increasing research scope, indicating that, compared with the paleotopography of the region, modern terrain has lower topographic relief over the entire area, while it has higher topographic relief in the smaller, local areas. The BTCI strengthens with increasing drainage area, which demonstrates a strong controlling effect over the entire study area, but a weak effect in the smaller, local areas because of the effect of paleotopography on modern terrain. The results provide for an understanding of the spatial variation of loess deposition in relation to paleotopography and contribute to the development of a process‐based loess‐landform evolution model. Copyright © 2015 John Wiley & Sons, Ltd.

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“…3-D PR has been used for gully erosion assessment at the gully reach or headcut scale (Castillo et al, 2012a;Kaiser et al, 2014;Gómez-Gutiérrez et al, 2014) and ephemeral gullies (Castillo et al, 2014a), usually not more than a few metres extent. However, the full characterization of gully erosion requires the assessment of entire gully networks to understand their geometry and dynamics and this brings several challenges for terrestrial PR:…”

Section: Introductionmentioning

confidence: 99%

SF3M software: 3-D photo-reconstruction for non-expert users and its application to a gully network

Castillo

James

Redel-Macías

et al. 2015

SOIL

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Abstract. Three-dimensional photo-reconstruction (PR) techniques have been successfully used to produce high-resolution surface models for different applications and over different spatial scales. However, innovative approaches are required to overcome some limitations that this technique may present for field image acquisition in challenging scene geometries. Here, we evaluate SF3M, a new graphical user interface for implementing a complete PR workflow based on freely available software (including external calls to VisualSFM and CloudCompare), in combination with a low-cost survey design for the reconstruction of a several-hundred-metres-long gully network. SF3M provided a semi-automated workflow for 3-D reconstruction requiring ∼ 49 h (of which only 17 % required operator assistance) for obtaining a final gully network model of > 17 million points over a gully plan area of 4230 m 2 . We show that a walking itinerary along the gully perimeter using two lightweight automatic cameras (1 s time-lapse mode) and a 6 m long pole is an efficient method for 3-D monitoring of gullies, at a low cost (∼ EUR 1000 budget for the field equipment) and the time requirements (∼ 90 min for image collection). A mean error of 6.9 cm at the ground control points was found, mainly due to model deformations derived from the linear geometry of the gully and residual errors in camera calibration. The straightforward image collection and processing approach can be of great benefit for non-expert users working on gully erosion assessment.

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The normalized topographic method: an automated procedure for gully mapping using GIS

Cited by 59 publications

References 24 publications

Archival photogrammetric analysis of river–floodplain systems using Structure from Motion (SfM) methods

Archival photogrammetric analysis of river–floodplain systems using Structure from Motion (SfM) methods

Paleotopographic controls on loess deposition in the Loess Plateau of China

SF3M software: 3-D photo-reconstruction for non-expert users and its application to a gully network

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