Influence of Spatial Resolution for Vegetation Indices’ Extraction Using Visible Bands from Unmanned Aerial Vehicles’ Orthomosaics Datasets

Saponaro, Mirko; Αγαπίου, Άθως; Hadjimitsis, Diofantos; Tarantino, Eufemia

doi:10.3390/rs13163238

Cited by 7 publications

(4 citation statements)

References 60 publications

(97 reference statements)

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“…A substantial improvement in the predictive performance of the indirect sea wave estimations obtained in the present study case can be reached by combining them with the most advanced methods for the quantitative assessment of stochastic uncertainty propagation [65][66][67][68][69][70][71][72], as reported by previous environmental and ecohydraulic engineering studies [73][74][75][76][77][78][79][80]. Finally, as illustrated in Figure 6, in this study, a good correlation was observed between average buoy-based and average satellite-based wave heights (m) over the southern coasts of the Caspian Sea, associated with a slight overestimation in all the examined months.…”

Section: Comparative Analysissupporting

confidence: 60%

Section: Comparative Analysissupporting

confidence: 58%

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On the Indirect Estimation of Wind Wave Heights over the Southern Coasts of Caspian Sea: A Comparative Analysis

Lama

Sadeghifar

Azad

et al. 2022

Water

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The prediction of ocean waves is a highly challenging task in coastal and water engineering in general due to their very high randomness. In the present case study, an analysis of wind, sea flow features, and wave height in the southern coasts of the Caspian Sea, especially in the off-coast sea waters of Mazandaran Province in Northern Iran, was performed. Satellite altimetry-based significant wave heights associated with the period of observation in 2016 were validated based on those measured at a buoy station in the same year. The comparative analysis between them showed that satellite-based wave heights are highly correlated to buoy data, as testified by a high coefficient of correlation r (0.87), low Bias (0.063 m), and root-mean-squared error (0.071 m). It was possible to assess that the dominant wave direction in the study area was northwest. Considering the main factors affecting wind-induced waves, the atmospheric framework in the examined sea region with high pressure was identified as the main factor to be taken into account in the formation of waves. The outcomes of the present research provide an interesting methodological tool for obtaining and processing accurate wave height estimations in such an intricate flow playground as the southern coasts of the Caspian Sea.

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Section: Comparative Analysissupporting

confidence: 60%

Section: Comparative Analysissupporting

confidence: 58%

On the Indirect Estimation of Wind Wave Heights over the Southern Coasts of Caspian Sea: A Comparative Analysis

Lama

Sadeghifar

Azad

et al. 2022

Water

View full text Add to dashboard Cite

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“…Soil Syst. 2024, 8, x FOR PEER REVIEW 8 of 18 [38]. Collectively, these studies affirm the effectiveness of co-alignment for enhancing both the relative and absolute accuracies within SfM applications.…”

Section: Classification Of Vegetation In Sfm Point Cloudsupporting

confidence: 59%

“…Furthermore, research [36,37] has shown the efficacy of co-alignment with varying imagery sources, including UAV, terrestrial, and satellite, under different conditions, and its potential for automation in generating accurate models. Saponaro et al highlighted its robustness in point cloud comparison for change detection [38]. Collectively, these studies affirm the effectiveness of co-alignment for enhancing both the relative and absolute accuracies within SfM applications.…”

Section: Sfm Point Cloud Generationmentioning

confidence: 72%

The Loss of Soil Parent Material: Detecting and Measuring the Erosion of Saprolite

Evans,

Cândido,

Coelho

et al. 2024

Soil Systems

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Soil parent material is a fundamental natural resource for the generation of new soils. Through weathering processes, soil parent materials provide many of the basic building blocks for soils and have a significant bearing on the physico-chemical makeup of the soil profile. Parent materials are critical for governing the stock, quality, and functionality of the soil they form. Most research on soil parent materials to date has aimed to establish and measure the processes by which soil is generated from them. Comparatively little work has been performed to assess the rates at which soil parent materials erode if they are exposed at the land surface. This is despite the threat that the erosion of soil parent materials poses to the process of soil formation and the loss of the essential ecosystem services those soils would have provided. A salient but unanswered question is whether the erosion of soil parent materials, when exposed at the land surface, outpaces the rates at which soils form from them. This study represents one of the first to detect and measure the loss of soil parent material. We applied Uncrewed Aerial Vehicle Structure-From-Motion (UAV-SfM) photogrammetry to detect, map, and quantify the erosion rates of an exposed saprolitic (i.e., weathered bedrock) surface on an agricultural hillslope in Brazil. We then utilized a global inventory of soil formation to compare these erosion rates with the rates at which soils form in equivalent lithologies and climatic contexts. We found that the measured saprolite erosion rates were between 14 and 3766 times faster than those of soil formation in similar climatic and lithological conditions. While these findings demonstrate that saprolite erosion can inhibit soil formation, our observations of above-ground vegetation on the exposed saprolitic surface suggests that weathered bedrock has the potential to sustain some biomass production even in the absence of traditional soils. This opens up a new avenue of enquiry within soil science: to what extent can saprolite and, by extension, soil parent materials deliver soil ecosystem services?

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LULC Classification Performance of Supervised and Unsupervised Algorithms on UAV-Orthomosaics

Saponaro

Tarantino

2022

Computational Science and Its Applications – ICCSA 2022 Workshops

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Influence of Spatial Resolution for Vegetation Indices’ Extraction Using Visible Bands from Unmanned Aerial Vehicles’ Orthomosaics Datasets

Cited by 7 publications

References 60 publications

On the Indirect Estimation of Wind Wave Heights over the Southern Coasts of Caspian Sea: A Comparative Analysis

On the Indirect Estimation of Wind Wave Heights over the Southern Coasts of Caspian Sea: A Comparative Analysis

The Loss of Soil Parent Material: Detecting and Measuring the Erosion of Saprolite

LULC Classification Performance of Supervised and Unsupervised Algorithms on UAV-Orthomosaics

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