Procedure to automate the classification and mapping of the vegetation density in arid aeolian sedimentary systems

García‐Romero, Leví; Hernández‐Cordero, Antonio I.; Hernández‐Calvento, Luis; Espino, Emma Pérez Chacón; López-Valcarcel, Beatríz González

doi:10.1177/0309133318776497

Cited by 12 publications

(5 citation statements)

References 74 publications

(91 reference statements)

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“…In 1961 the main dune directions were ENE-WSW, with only a few dune brinks facing E-W. This year dune brinks were detected practically throughout the entire area, and continuous, linked barchanoid dunes displayed along-brink lengths of up to 640 m. Where continuous dune brinks were not observed, Hernández-Cordero et al (2018) mapped cliff-top dunes formed by nebkha dunes (not barchanoid dunes) which were removed to gain agricultural land (Hernández-Calvento. 2006).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…In contrast, the development of the urban-tourist infrastructure has been significant as shown in Figure 3, and appears to have been a primary control on the sedimentary dynamics of the dune field. First, the buildings occupied a section of the old bypass dune system on the top of the terrace (Hernández-Calvento et al, 2014, García-Romero et al, 2016, Hernández-Cordero et al, 2018. Second, dune directions and movement trends changed around the terrace following development with dune migration directions being steered by the infrastructure as it developed.…”

Section: Changes To Environmental Conditions In the Maspalomas Dune Smentioning

confidence: 99%

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Biogeomorphological processes in an arid transgressive dunefield as indicators of human impact by urbanization

García‐Romero

Delgado‐Fernández

Hesp

et al. 2019

Science of The Total Environment

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Urban and tourist developments can have long-lasting impacts on coastal environments and fundamentally alter the evolution of coastal dune systems. This is the case of the Maspalomas dunefield (Gran Canaria, Canary Islands), hosting one of the largest tourist resorts in Spain. The resort was built on top of a sedimentary terrace at 25 m above sea level (El Inglés) in the 1960s, and has subsequently affected local winds and therefore aeolian sediment transport patterns. Buildings on the terrace deflect the winds to the south of the dunefield, where the rate of sediment transport accelerated. A shadow zone appeared to the lee side of the resort with a consequent decrease in wind speed and aeolian sediment transport and an increase in vegetation cover. In this paper, first we characterize the environmental changes around El Inglés terrace in recent decades, and describe the changes in the shadow zone through an analysis of the evolution of sedimentary volumes and vegetation characteristics (density, spatial patterns, and plants communities). A series of historical aerial photographs, recent orthophotos and digital elevation models obtained by digital photogrammetry and LiDAR, as well as fieldwork were used to characterize plant communities and spatial-temporal changes in erosive landforms. Results show changes in the pattern and migration rates of dunes located at the southern edge of the urbanization, as well as the formation of blowouts and large deflation areas, where the vegetation increases in density and number of plant communities. We discuss eco-anthropogenic factors that have produced these environmental changes.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Changes To Environmental Conditions In the Maspalomas Dune Smentioning

confidence: 99%

Biogeomorphological processes in an arid transgressive dunefield as indicators of human impact by urbanization

García‐Romero

Delgado‐Fernández

Hesp

et al. 2019

Science of The Total Environment

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“…The optimized soil adjusted vegetation index (OSAVI) has a similar formula to that of NDVI but is used to minimize the influence of soil reflectance [33], a concern in many arid and semiarid regions with high amounts of bare soil. Another example of an index potentially useful in studying western juniper is the total ratio vegetation index (TRVI) [34], which was developed to address different vegetation characteristics in arid and semiarid ecosystems (e.g., juniper woodlands).Other techniques used in image analysis such as classification have been utilized extensively for the detection and assessment of vegetation [35][36][37]. Pixel-based image analysis has been used for weed detection [38] and vegetation identification in mixed plant communities [39].…”

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confidence: 99%

“…Other techniques used in image analysis such as classification have been utilized extensively for the detection and assessment of vegetation [35][36][37]. Pixel-based image analysis has been used for weed detection [38] and vegetation identification in mixed plant communities [39].…”

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confidence: 99%

The Use of Low-Altitude UAV Imagery to Assess Western Juniper Density and Canopy Cover in Treated and Untreated Stands

Durfee

Ochoa

Mata-González

2019

Forests

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Monitoring vegetation characteristics and ground cover is crucial to determine appropriate management techniques in western juniper (Juniperus occidentalis Hook.) ecosystems. Remote-sensing techniques have been used to study vegetation cover; yet, few studies have applied these techniques using unmanned aerial vehicles (UAV), specifically in areas of juniper woodlands. We used ground-based data in conjunction with low-altitude UAV imagery to assess vegetation and ground cover characteristics in a paired watershed study located in central Oregon, USA. The study was comprised of a treated watershed (most juniper removed) and an untreated watershed. Research objectives were to: (1) evaluate the density and canopy cover of western juniper in a treated (juniper removed) and an untreated watershed; and, (2) assess the effectiveness of using low altitude UAV-based imagery to measure juniper-sapling population density and canopy cover. Groundbased measurements were used to assess vegetation features in each watershed and as a means to verify analysis from aerial imagery. Visual imagery (red, green, and blue wavelengths) and multispectral imagery (red, green, blue, near-infrared, and red-edge wavelengths) were captured using a quadcopter-style UAV. Canopy cover in the untreated watershed was estimated using two different methods: vegetation indices and support vector machine classification. Supervised classification was used to assess juniper sapling density and vegetation cover in the treated watershed. Results showed that vegetation indices that incorporated near-infrared reflectance values estimated canopy cover within 0.7% to 4.1% of ground-based calculations. Canopy cover estimates at the untreated watershed using supervised classification were within 0.9% to 2.3% of ground-based results. Supervised classification applied to fall imagery using multispectral bands provided the best estimates of juniper sapling density compared to imagery taken in the summer or to using visual imagery. Study results suggest that low-altitude multispectral imagery obtained using small UAV can be effectively used to assess western juniper density and canopy cover. western juniper in particular has arisen in two primary forms: through the encroachment of juniper into areas previously dominated by sagebrush (Artemisia tridentata Nutt.), and through increases in the density of juniper in areas where it was relatively sparse [3]. Historically, juniper was largely found in areas with lower fire risk [4]. Intensive grazing, reduced fire occurrence, and favorable wetter climate conditions have all been cited as reasons for the vast juniper expansion observed in the late 19th and early 20th century [3,5].Juniper expansion is a concern in many rangeland areas as it may lead to reduced water availability for other types of vegetation. Increased juniper canopy cover has been associated with increased bare ground and decreased shrub, forb, and grass cover [6] and reductions in vegetation production and diversity [7]. Several studies [6,[8][9][10][11...

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“…Given the scenario of global change, the monitoring of environmental aspects is very important in coastal areas as many of them present aeolian sedimentary environments in arid zones which need special protection. A more cost-effective approach to such environmental studies is of general interest, but is especially true for developing countries with less research funding [83]. In a subsequent experimental work [82], not described in this manuscript, the data acquisition system was again successfully deployed covering a larger extension.…”

Section: Discussionmentioning

confidence: 99%

A DIY Low-Cost Wireless Wind Data Acquisition System Used to Study an Arid Coastal Foredune

Domínguez‐Brito

Cabrera‐Gámez

Viera-Pérez

et al. 2020

Sensors

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Environmental studies on coastal dune systems are faced with a considerable cost barrier due to the cost of the instrumentation and sensory equipment required for data collection. These systems play an important role in coastal areas as a protection against erosion and as providers of stability to coastal sedimentary deposits. The DIY (Do-It-Yourself) approach to data acquisition can reduce the cost of these environmental studies. In this paper, a low-cost DIY wireless wind data acquisition system is presented which reduces the cost barrier inherent to these types of studies. The system is deployed for the analysis of the foredune of Maspalomas, an arid dune field situated on the south coast of Gran Canaria (Canary Islands, Spain), for the specific purpose of studying the dynamics of a dune type (tongue dunes), which is typical of this environment. The results obtained can be of interest for the study of these coastal environments at both the local level, for the management of this particular dune field, and at the general level for other similar dune fields around the world.

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Procedure to automate the classification and mapping of the vegetation density in arid aeolian sedimentary systems

Cited by 12 publications

References 74 publications

Biogeomorphological processes in an arid transgressive dunefield as indicators of human impact by urbanization

Biogeomorphological processes in an arid transgressive dunefield as indicators of human impact by urbanization

The Use of Low-Altitude UAV Imagery to Assess Western Juniper Density and Canopy Cover in Treated and Untreated Stands

A DIY Low-Cost Wireless Wind Data Acquisition System Used to Study an Arid Coastal Foredune

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