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  • Combining multiple resolutions into hierarchical representations for kernel-based image classification

    • Authors: Cui, Y.;  Advisor: -;  Participants: - (2016)

  • Geographic object-based image analysis (GEOBIA) framework has gained increasing interest recently. Following this popular paradigm, we propose a novel multiscale classification approach operating on a hierarchical image representation built from two images at different resolutions. They capture the same scene with different sensors and are naturally fused together through the hierarchical representation, where coarser levels are built from a Low Spatial Resolution (LSR) or Medium Spatial Resolution (MSR) image while finer levels are generated from a High Spatial Resolution (HSR) or Very High Spatial Resolution (VHSR) image. Such a representation allows one to benefit from the context information thanks to the coarser levels, and subregions spatial arrangement information thanks to t...
  • BB

  • Detection, segmentation and localization of individual trees from mms point cloud data

    • Authors: Weinmann, M.;  Advisor: -;  Participants: - (2016)

  • In this paper, we address the extraction of objects from 3D point clouds acquired with mobile mapping systems. More specifically, we focus on the detection of tree-like objects, a subsequent segmentation of individual trees and a localization of the respective trees. Thereby, the detection of tree-like objects is achieved via a binary point-wise classification based on geometric features, which categorizes each point of the 3D point cloud into either tree-like objects or non-tree-like objects. The subsequent segmentation and localization of individual trees is carried out by applying a 2D projection and a mean shift segmentation on a downsampled version of that part of the original 3D point cloud which represents all tree-like objects, and it also involves a segment-based shape anal...
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  • Developing a study aptitude test for international distance education students of geoinformation science and earth observation

    • Authors: Augustijn, Ellen-Wien; Zadeh, Parya Pasha;  Advisor: -;  Participants: - (2016)

  • Online diagnostic study aptitude tests are a common means of helping students select the correct type of course, and the correct mode of education. However, universities often lack the data to predict critical student success factors correctly. In this paper we discuss the development of an online entrance test for a university in the Netherlands, offering courses to international students. Aim of the test is to help future students decide on the mode of education (face-to-face or distance learning). Besides the development of the entrance test we also discuss its first results and future analysis to be conducted.
  • BB

  • Determination of optimal irrigation rates of agricultural crops under consideration of soil properties and climatic conditions

    • Authors: Bziava, K.; Kruashvili, I.;  Advisor: -;  Participants: - (2016)

  • In conditions of increasing water shortage, further development of irrigated agriculture production is impossible without improving the methods of cultivation of agricultural crops, primarily irrigation technology. In 2015 the experiment have been conducted on the territory of irrigation farming area of village Tamarisi (Marneuli Municipality), according to which comprehensive study of local climatic and soil conditions were conducted. Received data were used for computation crop water requirements for tomato and melon under the different irrigation treatments. Obtained results have shown the possibility of water use efficiency and obtaining sufficiently high yields of crops that participated in the experiment that became possible in a case of usage of drip irrigation technology in ...
  • BB

  • Evaluation of a metric camera system tailored for high precision UAV applications :

    • Authors: Kraft, T.;  Advisor: -;  Participants: - (2016)

  • In this paper we present the further evaluation of DLR’s modular airborne camera system MACS-Micro for small unmanned aerial vehicle (UAV). The main focus is on standardized calibration procedures and on photogrammetric workflows. The current prototype consists of an industrial grade frame imaging camera with 12 megapixel resolutions and a compact GNSS/IMU solution which are operated by an embedded computing unit (CPU). The camera was calibrated once pre-flight and several times post-flight over a period of 5 month using a three dimensional test field. The verification of the radiometric quality of the acquired images has been done under controlled static conditions and kinematic conditions testing different demosaicing methods. The validation of MACS-Micro is done by comparing a tr...
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  • Evaluation of Bias Correction Method for Satellite-Based Rainfall Data

    • Authors: Bhatti, Haris Akram;  Advisor: -;  Participants: - (2016)

  • With the advances in remote sensing technology, satellite-based rainfall estimates are gaining attraction in the field of hydrology, particularly in rainfall-runoff modeling. Since estimates are affected by errors correction is required. In this study, we tested the high resolution National Oceanic and Atmospheric Administration’s (NOAA) Climate Prediction Centre (CPC) morphing technique (CMORPH) satellite rainfall product (CMORPH) in the Gilgel Abbey catchment, Ethiopia. CMORPH data at 8 km-30 min resolution is aggregated to daily to match in-situ observations for the period 2003–2010. Study objectives are to assess bias of the satellite estimates, to identify optimum window size for application of bias correction and to test effectiveness of bias correction. Bias correction factor...
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  • Expanding Bicycle-Sharing Systems :Lessons Learnt from an Analysis of Usage

    • Authors: Zhang, Ying;  Advisor: -;  Participants: - (2016)

  • Bike-sharing programs, with initiatives to increase bike use and improve accessibility of urban transit, have received increasing attention in growing number of cities across the world. The latest generation of bike-sharing systems has employed smart card technology that produces station-based data or trip-level data. This facilitates the studies of the practical use of these systems. However, few studies have paid attention to the changes in users and system usage over the years, as well as the impact of system expansion on its usage. Monitoring the changes of system usage over years enables the identification of system performance and can serve as an input for improving the location-allocation of stations. The objective of this study is to explore the impact of the expansion of a ...