Mapping Linear Erosion Features Using High and Very High Resolution Satellite Imagery

Desprats, J.F.; Raclot, Damien; Rousseau, Marie; Cerdan, Olivier; Garçin, Manuel; Bissonnais, Yves Le; Slimane, Abir Ben; Fouché, Julien; Monfort, Daniel

doi:10.1002/ldr.1094

Cited by 51 publications

(53 citation statements)

References 34 publications

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“…Mapping is a very helpful tool to locate the land degradation processes and to foresee the expected changes. It has been also used to understand the factors and the behaviour of landscape changes (Desprats et al ., ; Jafari & Bakhshandehmehr ; Xu et al ., ). Mapping the potential of abandonment is then the second objective of this study.…”

Section: Introductionmentioning

confidence: 99%

Main Environmental Features Leading to Recent Land Abandonment in Murcia Region (Southeast Spain)

et al. 2015

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Land abandonment is a global phenomenon whose environmental consequences are difficult to assess. The Murcia region is one of the most arid regions in southern Europe and also one of the most prone to land abandonment. This study researches which environmental features are more relevant to explain abandonment at the agricultural plot scale. Geomorphometric features were measured at different scales to investigate which scales could be more relevant. Two different models have been used: logistic regression, a statistical model that allows the interpretation of the involved features, and Random Forest, a machine learning model with a higher predictive power but lower interpretability. The combined use of both such models allows a set of predictors to be selected, which, when used with Random Forest, produce a map that is highly accurate for predicting abandonment and, when used with logistic regression, produce an interpretable model. The main conclusion is that climate is the most relevant factor to explain land abandonment. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Main Environmental Features Leading to Recent Land Abandonment in Murcia Region (Southeast Spain)

et al. 2015

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“…Furthermore, the stereovision allows data to be obtained at an apparent resolution that is better than the nominal resolution (i.e., pixel size; 50 cm in our case). Despratts [63] showed values that were smaller than the nominal resolution. This may be due to the simple geometrical effect of a 3D view with respect to a 2D view (single image).…”

Section: Discussionmentioning

confidence: 82%

“…The lengths and widths of channels have been measured in the previous studies because they are usually derived from monoscopic satellite images [63]. This has been overcome by low-altitude UAV photogrammetry because it uses stereo pairs that allow millimetric resolutions [64].…”

Section: Discussionmentioning

confidence: 99%

“…The proposed method involves many aspects, including the aforementioned skill of the operator, the spatial resolutions and the quality of the stereoscopic satellite images, and the time span during which the correct illumination is achieved. The spatial resolution has a strong influence on the size of the linear erosion features that can be detected [63]. The quality of the image is fundamental for detecting small features, such as rills or ephemeral gullies, and includes photographic aspects such as the contrast, brightness and haze.…”

Section: Discussionmentioning

confidence: 99%

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The Use of Stereoscopic Satellite Images to Map Rills and Ephemeral Gullies

et al. 2015

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Accurate mapping and measurement of erosion channels is necessary to accurately estimate the impact of channeled erosion in an area. Field surveys can provide optimal quantitative results, but they are only applicable to small areas. Recently, photogrammetric techniques have been applied to small format aerial photographs that were taken by UAVs. Few studies have applied photogrammetry for mapping and measuring single permanent gullies using very high resolution stereoscopic satellite images. We explore the use of such images to map rills and ephemeral gullies and to measure the length, width and depth of individual erosion channels to estimate the eroded volumes. The proposed methodology was applied to the Collazzone area of Central Italy. All of the channel characteristics were determined using GeoEye-1 ® panchromatic stereoscopic satellite images of the 48-km 2 study area and a 3D floating cursor. We identified, mapped, and measured the lengths of 555 channel segments. The top width and depth could be measured in only a subset of the channel segments (the SMC subset). The SMC data were used to determine the coefficients of the power law relationship between the rill/gully volume and length (V = aL b ) and the uncertainties due to the channel depth measurements and the cross-sectional shape. The field data of the rill and gully volumes were within the estimated uncertainty. We defined a decision rule to distinguish rills from gullies on the basis of the segment length and applied the corresponding power law relationship that was derived from the SMC subset to estimate the eroded volume of the entire dataset. at the catchment scale can be considered moderate, whereas the erosion at the field scale exceeds the tolerance limit, which is consistent with data that have been summarized and/or discussed by several authors.

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“…Commonly reported features of degradation include track widening, erosion and incision, braiding, and soil compaction (Leung & Marion, ). These features constitute an increasingly common form of land degradation, even in our most valued and protected landscapes and habitats (Barrow, ; Chatterjea, ; Desprats et al, ; Lal, ). Specifically, trail degradation features compromise natural and recreational values of protected areas, are typically expensive to repair, and may invite user behavior that could exacerbate the impacts (Burde & Renfro, ).…”

Section: Introductionmentioning

confidence: 99%

Land degradation effects initiated by trail running events in an urban protected area of Hong Kong

Leung

Cheung

et al. 2018

Land Degrad Dev

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Trail degradation is a common management problem in protected areas, especially those that accommodate high levels of trail users or organized sporting events. Trail running became popular in Hong Kong in the early 2000s, with a number of trail running events involving large numbers of runners organized in recent years. Although trail competitions are believed to produce very intense impacts on trails and their surrounding environments, limited research exists to quantify and characterize these impacts to inform policy and management responses. This study empirically examined and evaluated the impacts generated by a running competition on a remote trail in Hong Kong. Results indicated that a running competition can cause significant initial degradation on the trail. Although some degradation features (e.g., incision) can recover in 6 months, some negative effects (e.g., soil coarsening) can persist or worsen. It is recommended that trail running competitions should be regulated in protected areas in terms of both number of events and number of participants. Trail maintenance is crucially important for keeping the protected areas in good condition.

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Mapping Linear Erosion Features Using High and Very High Resolution Satellite Imagery

Cited by 51 publications

References 34 publications

Main Environmental Features Leading to Recent Land Abandonment in Murcia Region (Southeast Spain)

Main Environmental Features Leading to Recent Land Abandonment in Murcia Region (Southeast Spain)

The Use of Stereoscopic Satellite Images to Map Rills and Ephemeral Gullies

Land degradation effects initiated by trail running events in an urban protected area of Hong Kong

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