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Authors: Avkopashvili, M.; Avkopashvili, G.; Advisor: -; Participants: - (2017) - The study is aimed at eco-monitoring of the Bolnisi municipality, Georgia. The monitoring was conducted of heavy metals (Cu, Zn, Cd) in system “water-soil-plant” in the area of Kazreti (Madneuli) – villages: Balichi, Ratevani, Naxiduri, Xidiskhuri. According to the results obtained in the soil, content of heavy metals are significantly higher than the allowable concentration limit. In spite of this in crops of the plants which were grown on this soil, content of Cu and Zn does not exceed the allowed concentration limits, Cd content was not found. Study plants were green been, mauhroom, green walnut, green pepper, cucumber, cherry, potato, tomato, walnut, garlic, dry been and corn. Study water were rivers Kazretula and Mashavera's water. Rivers Kazretula and Mashavera water content Z...
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Authors: Bindlish, R.; Chan, S.; Advisor: -; Participants: - (2017) - This paper describes the development and validation of an enhanced version of the current standard soil moisture product. Compared with the standard product that is posted on a 36 km grid, the new enhanced product is posted on a 9 km grid. Derived from the same time-ordered brightness temperature observations that feed the current standard passive soil moisture product, the enhanced passive soil moisture product leverages on the Backus-Gilbert optimal interpolation technique that more fully utilizes the additional information from the original radiometer observations to achieve global mapping of soil moisture with enhanced clarity. The resulting enhanced soil moisture product was assessed using long-term in situ soil moisture observations from core validation sites located in divers...
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Authors: Díaz Vilariño, L.; Khoshelham, K.; Advisor: -; Participants: - (2017) - Automated generation of 3D indoor models from point cloud data has been a topic of intensive research in recent years. While results on various datasets have been reported in literature, a comparison of the performance of different methods has not been possible due to the lack of benchmark datasets and a common evaluation framework. The ISPRS benchmark on indoor modelling aims to address this issue by providing a public benchmark dataset and an evaluation framework for performance comparison of indoor modelling methods. In this paper, we present the benchmark dataset comprising several point clouds of indoor environments captured by different sensors. We also discuss the evaluation and comparison of indoor modelling methods based on manually created reference models and appropriate ...
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Authors: Peter, M.; Nikoohemat, S.; Advisor: -; Participants: - (2017) - The use of Indoor Mobile Laser Scanners (IMLS) for data collection in indoor environments has been increasing in the recent years. These systems, unlike Terrestrial Laser Scanners (TLS), collect data along a trajectory instead of at discrete scanner positions. In this research, we propose several methods to exploit the trajectories of IMLS systems for the interpretation of point clouds. By means of occlusion reasoning and use of trajectory as a set of scanner positions, we are capable of detecting openings in cluttered indoor environments. In order to provide information about both the partitioning of the space and the navigable space, we use the voxel concept for point clouds. Furthermore, to reconstruct walls, floor and ceiling we exploit the indoor topology and plane primitives. ...
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Authors: Jiang, Q.; Deng, Y.; Advisor: -; Participants: - (2017) - This paper put forward a new method that using the perovskite–type oxide (LaCuxNi1-xO3) as the solar thermal energy storage material which can drop the reduction temperature to below 500℃ that parabolic-trough solar collectors could reach. Herein, LaCuxNi1-xO3(x =0, 0.1, 0.2, 0.3, 0.5) is synthesized and investigated. Besides, the physical and chemical properties of LaCuxNi1-xO3 are tested by XRD, SEM and BET, and the reactivity and generation are studied through experiments by means of thermogravimetric analyzer (TGA). Experimental results indicate that these five oxygen carriers are of high porosity and this porous structure benefits from doping by Cu at B-site when LaCuxNi1-xO3 reacts with methane at 350℃, it exhibits great performance such as high reproducibility and good resist...
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Authors: Garcia-Chapeton, G.A.; Advisor: -; Participants: - (2017) - Our research focuses on advancing the support for collaborative work and long-term analysis in Geo-Visual Analytics. At the same time, it brings the analytical power offered by Geo-Visual Analytics to the study of pest population dynamics, which addresses important societal, ecological and economic challenges. In this paper, we describe the first steps towards an integrated Collaborative Geo-Visual Analytics system: First, an analysis of requirements to support the monitoring and control of pests in general, and specific requirements for our application case concerning the Olive Fruit Fly in Málaga, Spain. Second, we designed a system architecture that supports novel and established collaboration techniques, and developed an initial prototype focused in data integration, data enrich...
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Authors: Jongman, R.H.G.; Advisor: -; Participants: - (2017) - This chapter covers the questions of ecosystem definition and the organisation of a monitoring system. It treats where and how ecosystems should be measured and the integration between in situ and RS observations. Ecosystems are characterised by composition, function and structure. The ecosystem level is an essential link in biodiversity surveillance and monitoring between species and populations on the one hand and land use and landscapes on the other. Ecosystem monitoring requires a clear conceptual model that incorporates key factors influencing ecosystem dynamics to base the variables on that have to be monitored as well as data collection methods and statistics. Choices have to be made on the scale at which monitoring should be carried out and eco-regionalisation or ecological ...
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Authors: Poorthuis, A.; Wu, X.; Advisor: -; Participants: - (2017) - Since current studies on clustering analysis mainly focus on exploring spatial or temporal patterns separately, a co-clustering algorithm is utilized in this study to enable the concurrent analysis of spatio-temporal patterns. To allow users to adopt and adapt the algorithm for their own analysis, it is integrated within the server side of an interactive web-based platform. The client side of the platform, running within any modern browser, is a graphical user interface (GUI) with multiple linked visualizations that facilitates the understanding, exploration and interpretation of the raw dataset and co-clustering results. Users can also upload their own datasets and adjust clustering parameters within the platform. To illustrate the use of this platform, an annual temperature datase...
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Authors: Majozi, N.P.; Advisor: -; Participants: - (2017) - Flux towers provide essential terrestrial climate, water, and radiation budget information needed for environmental monitoring and evaluation of climate change impacts on ecosystems and society in general. They are also intended for calibration and validation of satellite-based Earth observation and monitoring efforts, such as assessment of evapotranspiration from land and vegetation surfaces using surface energy balance approaches. In this paper, 15 years of Skukuza eddy covariance data, i.e. from 2000 to 2014, were analysed for surface energy balance closure (EBC) and partitioning. The surface energy balance closure was evaluated using the ordinary least squares regression (OLS) of turbulent energy fluxes (sensible (H) and latent heat (LE)) against available energy (net radiation ...
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Authors: Awange, J.L.; Ndehedehe, C.E.; Advisor: -; Participants: - (2017) - By combining satellite altimetry with Gravity Recovery and Climate Experiment derived terrestrial water storage-TWS (2002–2014), this study used a two-step procedure based on spherical harmonic synthesis and statistical decomposition to support the understanding of the Volta basin's natural hydrology and its freshwater systems. Results indicate that Lake Volta contributed 41.6% to the observed increase in TWS over the basin during the 2002–2014 period. While it also coincides with observed decline in net precipitation (−15 mm/yr), the long dry periods in the basin (2001–2007) also contributed to this storage depletion. The Lake Volta shows sensitivity to incoming flows of the Volta river system with a lag spanning between less than one and up to two years. In addition to this, a 4–5...
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