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Riparian habitats provide a series of ecological services vital for the balance of the environment, and are niches and resources for a wide variety of species. Monitoring riparian environments at the intra-habitat level is crucial for assessing and preserving their conservation status, although it is challenging due to their landscape complexity. Unmanned aerial vehicles (UAV) and multi-spectral optical sensors can be used for very high resolution (VHR) monitoring in terms of spectral, spatial, and temporal resolutions. In this contribution, the vegetation species of the riparian habitat (91E0*, 3240 of Natura 2000 network) of North-West Italy were mapped at individual tree (ITD) level using machine learning and a multi-temporal phenology-based approach. Three UAV flights were conducted at the phenological-relevant time of the year (epochs). The data were analyzed using a structure from motion (SfM) approach. The resulting orthomosaics were segmented and classified using a random forest (RF) algorithm. The training dataset was composed of field-collected data, and was oversampled to reduce the effects of unbalancing and size. Three-hundred features were computed considering spectral, textural, and geometric information. Finally, the RF model was cross-validated (leave-one-out). This model was applied to eight scenarios that differed in temporal resolution to assess the role of multi-temporality over the UAV’s VHR optical data. Results showed better performances in multi-epoch phenology-based classification than single-epochs ones, with 0.71 overall accuracy compared to 0.61. Some classes, such as Pinus sylvestris and Betula pendula, are remarkably influenced by the phenology-based multi-temporality: the F1-score increased by 0.3 points by considering three epochs instead of two.
Elena Belcore; Marco Pittarello; Andrea Lingua; Michele Lonati. Mapping Riparian Habitats of Natura 2000 Network (91E0*, 3240) at Individual Tree Level Using UAV Multi-Temporal and Multi-Spectral Data. Remote Sensing 2021, 13, 1756 .
AMA StyleElena Belcore, Marco Pittarello, Andrea Lingua, Michele Lonati. Mapping Riparian Habitats of Natura 2000 Network (91E0*, 3240) at Individual Tree Level Using UAV Multi-Temporal and Multi-Spectral Data. Remote Sensing. 2021; 13 (9):1756.
Chicago/Turabian StyleElena Belcore; Marco Pittarello; Andrea Lingua; Michele Lonati. 2021. "Mapping Riparian Habitats of Natura 2000 Network (91E0*, 3240) at Individual Tree Level Using UAV Multi-Temporal and Multi-Spectral Data." Remote Sensing 13, no. 9: 1756.
In the past decades, technology-based agriculture, also known as Precision Agriculture (PA) or smart farming, has grown, developing new technologies and innovative tools to manage data for the whole agricultural processes. In this framework, geographic information, and spatial data and tools such as UAVs (Unmanned Aerial Vehicles) and multispectral optical sensors play a crucial role in the geomatics as support techniques. PA needs software to store and process spatial data and the Free and Open Software System (FOSS) community kept pace with PA’s needs: several FOSS software tools have been developed for data gathering, analysis, and restitution. The adoption of FOSS solutions, WebGIS platforms, open databases, and spatial data infrastructure to process and store spatial and nonspatial acquired data helps to share information among different actors with user-friendly solutions. Nevertheless, a comprehensive open-source platform that, besides processing UAV data, allows directly storing, visualising, sharing, and querying the final results and the related information does not exist. Indeed, today, the PA’s data elaboration and management with a FOSS approach still require several different software tools. Moreover, although some commercial solutions presented platforms to support management in PA activities, none of these present a complete workflow including data from acquisition phase to processed and stored information. In this scenario, the paper aims to provide UAV and PA users with a FOSS-replicable methodology that can fit farming activities’ operational and management needs. Therefore, this work focuses on developing a totally FOSS workflow to visualise, process, analyse, and manage PA data. In detail, a multidisciplinary approach is adopted for creating an operative web-sharing tool able to manage Very High Resolution (VHR) agricultural multispectral-derived information gathered by UAV systems. A vineyard in Northern Italy is used as an example to show the workflow of data generation and the data structure of the web tool. A UAV survey was carried out using a six-band multispectral camera and the data were elaborated through the Structure from Motion (SfM) technique, resulting in 3 cm resolution orthophoto. A supervised classifier identified the phenological stage of under-row weeds and the rows with a 95% overall accuracy. Then, a set of GIS-developed algorithms allowed Individual Tree Detection (ITD) and spectral indices for monitoring the plant-based phytosanitary conditions. A spatial data structure was implemented to gather the data at canopy scale. The last step of the workflow concerned publishing data in an interactive 3D webGIS, allowing users to update the spatial database. The webGIS can be operated from web browsers and desktop GIS. The final result is a shared open platform obtained with nonproprietary software that can store data of different sources and scales.
Elena Belcore; Stefano Angeli; Elisabetta Colucci; Maria Musci; Irene Aicardi. Precision Agriculture Workflow, from Data Collection to Data Management Using FOSS Tools: An Application in Northern Italy Vineyard. ISPRS International Journal of Geo-Information 2021, 10, 236 .
AMA StyleElena Belcore, Stefano Angeli, Elisabetta Colucci, Maria Musci, Irene Aicardi. Precision Agriculture Workflow, from Data Collection to Data Management Using FOSS Tools: An Application in Northern Italy Vineyard. ISPRS International Journal of Geo-Information. 2021; 10 (4):236.
Chicago/Turabian StyleElena Belcore; Stefano Angeli; Elisabetta Colucci; Maria Musci; Irene Aicardi. 2021. "Precision Agriculture Workflow, from Data Collection to Data Management Using FOSS Tools: An Application in Northern Italy Vineyard." ISPRS International Journal of Geo-Information 10, no. 4: 236.
This article explores the application of Hölder exponent analysis for the identification and delineation of single tree crowns from very high-resolution (VHR) imagery captured by unmanned aerial vehicles (UAV). Most of the present individual tree crown detection (ITD) methods are based on canopy height models (CHM) and are very effective as far as an accurate digital terrain model (DTM) is available. This prerequisite is hard to accomplish in some environments, such as alpine forests, because of the high tree density and the irregular topography. Indeed, in such conditions, the photogrammetrically derived DTM can be inaccurate. A novel image processing method supports the segmentation of crowns based only on the parameter related to the multifractality description of the image. In particular, the multifractality is related to the deviation from a strict self-similarity and can be treated as the information about the level of inhomogeneity of considered data. The multifractals, even if well established in image processing and recognized by the scientific community, represent a relatively new application in VHR aerial imagery. In this work, the Hölder exponent (one of the parameters related to multifractal description) is applied to the study of a coniferous forest in the Western Alps. The infrared dataset with 10 cm pixels is captured by a UAV-mounted optical sensor. Then, the tree crowns are detected by a basic workflow. This consists of the thresholding of the image on the basis of the Hölder exponent. Then, the single crowns are segmented through a multiresolution segmentation approach. The ITD segmentation was validated through a two-level validation analysis that included a visual evaluation and the computing of quantitative measures based on 200 reference crowns. The results were checked against the ITD performed in the same area but using only spectral, textural, and elevation information. Specifically, the visual assessment included the estimation of the producer’s and user’s accuracies and the F1 score. The quantitative measures considered are the root mean square error (RMSE) (for the area, the perimeter, and the distance between centroids) and the over-segmentation and under-segmentation indices, the Jaccard index, and the completeness index. The F1 score indicates positive results (over 73%) as well as the completeness index that does not exceed 0.23 on a scale of 0 to 1, taking 0 as the best result possible. The RMSE of the extension of crowns is 3 m2, which represents only 14% of the average extension of reference crowns. The performance of the segmentation based on the Hölder exponent outclasses those based on spectral, textural, and elevation information. Despite the good results of the segmentation, the method tends to under-segment rather than over-segment, especially in areas with sloping. This study lays the groundwork for future research into ITD from VHR optical imagery using multifractals.
Elena Belcore; Anna Wawrzaszek; Edyta Wozniak; Nives Grasso; Marco Piras. Individual Tree Detection from UAV Imagery Using Hölder Exponent. Remote Sensing 2020, 12, 2407 .
AMA StyleElena Belcore, Anna Wawrzaszek, Edyta Wozniak, Nives Grasso, Marco Piras. Individual Tree Detection from UAV Imagery Using Hölder Exponent. Remote Sensing. 2020; 12 (15):2407.
Chicago/Turabian StyleElena Belcore; Anna Wawrzaszek; Edyta Wozniak; Nives Grasso; Marco Piras. 2020. "Individual Tree Detection from UAV Imagery Using Hölder Exponent." Remote Sensing 12, no. 15: 2407.
Identifying areas of the world, communities, and women and men that could be damaged by meteorological events (like droughts and floods) has been crucial for vulnerability studies in the last decade. Climate change may differently affect female‐ and male‐headed households, especially in rural areas of sub‐Saharan Africa, where they react in a different way to the effects of adverse weather events. The aim of this work was to analyse a population's vulnerability and resilience to climate‐related hazards, applying a sex‐disaggregated, quantitative methodology at household level. This study was realised in three Woredas (Siraro, Shalla, and Shashemene) of the Oromia Region in Ethiopia. The information used for the evaluation included climatic conditions, socio‐economic variables and natural resource availability. All data collected were analysed after disaggregation by sex. Evaluation of the indices shows that the vulnerability of the households is particularly related to the presence of governmental infrastructure, availability of water sources, and external aid. The study reveals that the Woreda of Siraro is the most vulnerable. A better situation appears in the Woredas of Shalla and Shashemene, where women and men have more skills to face vulnerability, as highlighted by the “recovery potential” index. On the other hand, the study points out some differences between women and men. While male‐headed households mainly have low vulnerability and high resilience, female‐headed households are divided into two main classes: low vulnerability associated with low resilience, and low vulnerability associated with high resilience. When the vulnerability is higher, both women and men show higher resilience.
Elena Belcore; Alessandro Pezzoli; Angela Calvo. Analysis of gender vulnerability to climate‐related hazards in a rural area of Ethiopia. The Geographical Journal 2019, 186, 156 -170.
AMA StyleElena Belcore, Alessandro Pezzoli, Angela Calvo. Analysis of gender vulnerability to climate‐related hazards in a rural area of Ethiopia. The Geographical Journal. 2019; 186 (2):156-170.
Chicago/Turabian StyleElena Belcore; Alessandro Pezzoli; Angela Calvo. 2019. "Analysis of gender vulnerability to climate‐related hazards in a rural area of Ethiopia." The Geographical Journal 186, no. 2: 156-170.
South of the Sahara, flood vulnerability and risk assessments at local level rarely identify the exposed areas according to the probability of flooding or the actions in place, or localize the exposed items. They are, therefore, of little use for local development, risk prevention, and contingency planning. The aim of this article is to assess the flood risk, providing useful information for local planning and an assessment methodology useful for other case studies. As a result, the first step involves identifying the information required by the local plans most used south of the Sahara. Four rural communities in Niger, frequently flooded by the Sirba River, are then considered. The risk is the product of the probability of a flood multiplied by the potential damage. Local knowledge and knowledge derived from a hydraulic numerical model, digital terrain model, very high resolution multispectral orthoimages, and daily precipitation are used. The assessment identifies the probability of fluvial and pluvial flooding, the exposed areas, the position, quantity, type, replacement value of exposed items, and the risk level according to three flooding scenarios. Fifteen actions are suggested to reduce the risk and to turn adversity into opportunity.
Maurizio Tiepolo; Maurizio Rosso; Giovanni Massazza; Elena Belcore; Souradji Issa; Sarah Braccio. Flood Assessment for Risk-Informed Planning along the Sirba River, Niger. Sustainability 2019, 11, 4003 .
AMA StyleMaurizio Tiepolo, Maurizio Rosso, Giovanni Massazza, Elena Belcore, Souradji Issa, Sarah Braccio. Flood Assessment for Risk-Informed Planning along the Sirba River, Niger. Sustainability. 2019; 11 (15):4003.
Chicago/Turabian StyleMaurizio Tiepolo; Maurizio Rosso; Giovanni Massazza; Elena Belcore; Souradji Issa; Sarah Braccio. 2019. "Flood Assessment for Risk-Informed Planning along the Sirba River, Niger." Sustainability 11, no. 15: 4003.
The technology of UAV (Unmanned Aerial Vehicles) is rapidly improving and UAV-integrated sensors have kept up with it, providing more efficient and effective solutions. One of the most sought-after characteristics of on-board sensors is the low costing associated to good quality of the collected data. This paper proposes a very low-cost multiband sensor developed on a Raspberry device and two Raspberry Pi 3 cameras that can be used in photogrammetry from drone applications. The UAV-integrated radiometric sensor and its performance were tested in in two villages of South-west Niger for the detection of temporary surface water bodies (or Ephemeral water bodies): zones of seasonal stagnant water within villages threatening the viability and people’s health. The Raspberry Pi 3 cameras employed were a regular RGB Pi camera 2 (Red, Green, Blue) and a NoIR Pi 3 camera v2 (regular RGB without IR filter) with 8MPX resolution. The cameras were geometrically calibrated and radiometrically tested before the survey in the field. The results of the photogrammetry elaborations were 4 orthophotos (a RGB and NoIRGB orthophoto for each village). The Normalized Difference Water Index (NDWI) was calculated. The index allowed the localization and the contouring of the temporary surface water bodies present in the villages. The data were checked against the data collected with a Sony (ILCE-5100). Very high correspondence between the different data was detected. Raspberry-based sensors demonstrated to be a valid tool for the data collection in critical areas.
E. Belcore; M. Piras; A. Pezzoli; Giovanni Massazza; M. Rosso. RASPBERRY PI 3 MULTISPECTRAL LOW-COST SENSOR FOR UAV BASED REMOTE SENSING. CASE STUDY IN SOUTH-WEST NIGER. ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences 2019, XLII-2/W13, 207 -214.
AMA StyleE. Belcore, M. Piras, A. Pezzoli, Giovanni Massazza, M. Rosso. RASPBERRY PI 3 MULTISPECTRAL LOW-COST SENSOR FOR UAV BASED REMOTE SENSING. CASE STUDY IN SOUTH-WEST NIGER. ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. 2019; XLII-2/W13 ():207-214.
Chicago/Turabian StyleE. Belcore; M. Piras; A. Pezzoli; Giovanni Massazza; M. Rosso. 2019. "RASPBERRY PI 3 MULTISPECTRAL LOW-COST SENSOR FOR UAV BASED REMOTE SENSING. CASE STUDY IN SOUTH-WEST NIGER." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W13, no. : 207-214.
In Sahelian countries, a vast number of people are still affected every year by flood despite the efforts to prevent or mitigate these catastrophic events. This phenomenon is exacerbated by the incessant population growth and the increase of extreme natural events. Hence, the development of flood management strategies such as flood hazard mapping and Early Warning Systems has become a crucial objective for the affected nations. This study presents a comprehensive hazard assessment of the Nigerien reach of the Sirba River, the main tributary Middle Niger River. Hazard thresholds were defined both on hydrological analysis and field effects, according to national guidelines. Non-stationary analyses were carried out to consider changes in the hydrological behavior of the Sirba basin over time. Data from topographical land surveys and discharge gauges collected during the 2018 dry and wet seasons were used to implement the hydraulic numerical model of the analyzed reach. The use of the proposed hydraulic model allowed the delineation of flood hazard maps as well the calculation of the flood propagation time from the upstream hydrometric station and the validation of the rating curves of the two gauging sites. These significative outcomes will allow the implementation of the Early Warning System for the river flood hazard and risk reduction plans preparation for each settlement.
Giovanni Massazza; Paolo Tamagnone; Catherine Wilcox; Elena Belcore; Alessandro Pezzoli; Theo Vischel; Gérémy Panthou; Mohamed Housseini Ibrahim; Maurizio Tiepolo; Vieri Tarchiani; Maurizio Rosso. Flood Hazard Scenarios of the Sirba River (Niger): Evaluation of the Hazard Thresholds and Flooding Areas. Water 2019, 11, 1018 .
AMA StyleGiovanni Massazza, Paolo Tamagnone, Catherine Wilcox, Elena Belcore, Alessandro Pezzoli, Theo Vischel, Gérémy Panthou, Mohamed Housseini Ibrahim, Maurizio Tiepolo, Vieri Tarchiani, Maurizio Rosso. Flood Hazard Scenarios of the Sirba River (Niger): Evaluation of the Hazard Thresholds and Flooding Areas. Water. 2019; 11 (5):1018.
Chicago/Turabian StyleGiovanni Massazza; Paolo Tamagnone; Catherine Wilcox; Elena Belcore; Alessandro Pezzoli; Theo Vischel; Gérémy Panthou; Mohamed Housseini Ibrahim; Maurizio Tiepolo; Vieri Tarchiani; Maurizio Rosso. 2019. "Flood Hazard Scenarios of the Sirba River (Niger): Evaluation of the Hazard Thresholds and Flooding Areas." Water 11, no. 5: 1018.
Goal of the vulnerability research of the last years is to evaluate which community, region, or nation is more vulnerable in terms of its sensitive to damaging effects of extreme meteorological events like floods or droughts. Ethiopia is a country where it is possible to find the described conditions. Aim of this work was to develop an integrated system of early warning and response, whereas neither landmark data nor vulnerability drought analysis existed in the country. Specifically, a vulnerability index and a capacity to react index of the population of three Woredas in the Oromia Region of Ethiopia were determined and analysed. Input data concerned rainfall, water availability, physical land characteristics, agricultural and livestock dimensions, as well as population and socio-economic indices. Data were collected during a specific NGO project and thanks to a field research funded by the University of Torino. Results were analysed and specific maps were drawn. The mapping of the vulnerability indices revealed that the more isolated Woreda with less communication roads and with less water sources presented the worst data almost on all its territory. Despite not bad vulnerability indices in the other two Woredas, however, population here still encountered difficulty to adapt to sudden climatic changes, as revealed by the other index of capacity to reaction. Beyond the interpretation of each parameter, a more complete reading key was possible using the SPI (Standardized Precipitation Index) beside these indicators. In a normalized scale between 0 and 1, in this study the calculated annual SPI index was 0.83: the area is therefore considerably exposed to the drought risk, caused by an high intensity and frequency of rainfall lack.
Elena Belcore; Angela Calvo; Carolin Canessa; Alessandro Pezzoli. A Methodology for the Vulnerability Analysis of the Climate Change in the Oromia Region, Ethiopia. Green Energy and Technology 2017, 73 -102.
AMA StyleElena Belcore, Angela Calvo, Carolin Canessa, Alessandro Pezzoli. A Methodology for the Vulnerability Analysis of the Climate Change in the Oromia Region, Ethiopia. Green Energy and Technology. 2017; ():73-102.
Chicago/Turabian StyleElena Belcore; Angela Calvo; Carolin Canessa; Alessandro Pezzoli. 2017. "A Methodology for the Vulnerability Analysis of the Climate Change in the Oromia Region, Ethiopia." Green Energy and Technology , no. : 73-102.