Modeling the topography of shallow braided rivers using Structure-from-Motion photogrammetry

Javernick, Luke; Brasington, James; Caruso, Brian S.

doi:10.1016/j.geomorph.2014.01.006

Cited by 582 publications

(498 citation statements)

References 31 publications

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“…This therefore agrees with more photogrammetrically rigorous papers (i.e. James and Robson, 2014;Wackrow and Chandler, 2011;Javernick et al, 2014) although the approach, has been largely overlooked in much of the geoscience literature (e.g. Boon et al, 2016;Casella et al, 2016).…”

Section: Discussionsupporting

confidence: 86%

Comparison of pre- and self-calibrated camera calibration models for UAS-derived nadir imagery for a SfM application

Griffiths

Burningham

2018

Progress in Physical Geography: Earth and Environment

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Structure from Motion (SfM) is a tool being increasingly utilised in geosciences for high-resolution three-dimensional mapping of landscapes. However, a number of authors have demonstrated that broad-scale systematic deformations, in the form of ‘doming’ and ‘bowling’, can occur when applied to linear (low-amplitude, feature-limited) topographies. In such contexts, a more rigorous lens calibration and ground control point acquisition process is required, which means that application of SfM to environments such as tidal flats or desert plains can be challenging. Uncertainties in elevation models generated through SfM were investigated here in the context of the low elevation, micro-topographic environment of saltmarsh. Eight digital surface models (DSMs) were generated for a saltmarsh site in the Deben Estuary (Suffolk, UK) using imagery acquired by a low-cost consumer grade unmanned aerial system (UAS). The results provide clear illustration of the systematic bowling effect following self-calibration during bundle adjustment. This was due to poor estimations of distortion parameters in the camera model. Deformation was most pronounced when UAS-GPS data were used for georeferencing. The use of dGPS-determined ground control points improved the DSM, but did not fully mitigate the deformations. By introducing a pre-calibrated model, derived using a typical checkerboard routine, deformation was significantly mitigated. These results were tested in both the commercial Agisoft PhotoScan® and open-source Micmac software. When self-calibration was used, Micmac generated significantly more accurate DSMs because a more complex lens distortion model could be implemented. The results show that when mapping flat topographies, pre-calibration of the camera model out-performs self-calibration. However, if pre-calibration is not possible, a complex distortion model (such as Micmac’s Four model) can be utilised to limit deformation. The results of the software analysis concluded there is no one-size fits all software solution, and therefore customisable open-source systems offer many potential benefits.

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Section: Discussionsupporting

confidence: 86%

Comparison of pre- and self-calibrated camera calibration models for UAS-derived nadir imagery for a SfM application

Griffiths

Burningham

2018

Progress in Physical Geography: Earth and Environment

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“…Despite their increased capabilities, the use of drones in geophysical sciences is usually restricted to image acquisition for generating highresolution maps (Tauro et al 2016). Some authors offered a solution-the use of UAV systems to reconstruct topography in coastal environment (Mancini et al 2013), shallow braided rivers (Javernick et al 2014) and lakes. More sensors will be developed over time allowing, for example, in situ measurements (Kageyama et al 2016;Koparan and Koc 2016), pollution meters (Zang et al 2012) and so on.…”

Section: Introductionmentioning

confidence: 99%

Application of Low-Cost Fixed-Wing UAV for Inland Lakes Shoreline Investigation

Templin

Popielarczyk

Kosecki

2017

Pure Appl. Geophys.

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Abstract-One of the most important factors that influences the performance of geomorphologic parameters on urban lakes is the water level. It fluctuates periodically, causing shoreline changes. It is especially significant for typical environmental studies like bathymetric surveys, morphometric parameters calculation, sediment depth changes, thermal structure, water quality monitoring, etc. In most reservoirs, it can be obtained from digitized historical maps or plans or directly measured using the instruments such as: geodetic total station, GNSS receivers, UAV with different sensors, satellite and aerial photos, terrestrial and airborne light detection and ranging, or others. Today one of the most popular measuring platforms, increasingly applied in many applications is UAV. Unmanned aerial system can be a cheap, easy to use, on-demand technology for gathering remote sensing data. Our study presents a reliable methodology for shallow lake shoreline investigation with the use of a low-cost fixed-wing UAV system. The research was implemented on a small, eutrophic urban inland reservoir located in the northern part of Poland-Lake Suskie. The geodetic TS, and RTK/GNSS measurements, hydroacoustic soundings and experimental aerial mapping were conducted by the authors in 2012-2015. The article specifically describes the UAV system used for experimental measurements, the obtained results and the accuracy analysis. Final conclusions demonstrate that even a lowcost fixed-wing UAV can provide an excellent tool for accurately surveying a shallow lake shoreline and generate valuable geoinformation data collected definitely faster than when traditional geodetic methods are employed.

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“…The motion of the camera attached to the kite resulted in mostly offnadir images and several images from different elevations (i.e., captured during takeoff and landing) which help to mitigate systematic error ('doming') during the DSM generation phase, especially in the flat, low slope coastal environment (e.g., James and Robson, 2014). Additionally the use of GCPs in the processing routine is known to reduce systemic error such as doming (e.g., Javernick et al, 2014).…”

Section: Methodsmentioning

confidence: 99%

Ground control point requirements for structure-from-motion derived topography in low-slope coastal environments

Goldstein

Oliver

deVries

et al. 2015

Preprint

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Vegetated coastal dunes grow as a result of feedbacks between vegetation and sand transport. Observing the coevolution of vegetation and the sand surface is therefore critical for unraveling the dynamics of coastal dune growth. Capturing synchronous topography and photography at high spatial resolution and high temporal frequency using traditional techniques (airplane-based aerial photography, LiDAR) is expensive and timeconsuming. Structure-from-Motion combined with Multiview-Stereo, a photogrammetry workflow that uses low-cost, consumer-grade equipment, is an economical alternative to traditional collection methods. This workflow still requires the definition of ground control points (GCPs) -locations with known coordinates -to develop accurate digital surface models. In this contribution we address how the number of GCPs used impacts the accuracy of digital surface models. We flew a 9-foot single-line delta kite attached to a consumer-grade camera to photograph the beach and dune of Hog Island, VA, a site that contains 178 high precision GCPs over an area of ~0.025 km 2 (as part of an ongoing field experiment). We then processed the 318 photographs using Agisoft Photoscan and compared the elevation accuracy of digital surface models rendered using SfM, with varying GCPs, to points surveyed by a total station. Our results suggest that there is 'diminishing returns' when greater than 10 GCPs are used. Results from this study can be used to inform future Structure-from-Motion studies using UAVs or kites in flat, lowsloping coastal environments.

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Modeling the topography of shallow braided rivers using Structure-from-Motion photogrammetry

Cited by 582 publications

References 31 publications

Comparison of pre- and self-calibrated camera calibration models for UAS-derived nadir imagery for a SfM application

Comparison of pre- and self-calibrated camera calibration models for UAS-derived nadir imagery for a SfM application

Application of Low-Cost Fixed-Wing UAV for Inland Lakes Shoreline Investigation

Ground control point requirements for structure-from-motion derived topography in low-slope coastal environments

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