Filter by collection

Current filters:


Current filters:


Refine By:

Search Results

Results 11-20 of 55 (Search time: 0.001 seconds).
Item hits:
  • LA

  • Automatic verification of buildings using oblique airborne images

    • Authors: Vosselman, G.; Nyaruhuma, A.P.;  Advisor: -;  Participants: - (2013)

  • Thesis presents the state of art building verification and update and the current use of oblique images; describes the method developed for automatic verification of 2D vector data (building outlines); discusses experiments and results from the verification of building outlines; presents the method developed for verification of 3D vector data (3D building models); presents 3D building verification experiments; conclusion and recommendations.
  • BB

  • Characterization of the top sediment layer in coastal intertidal mudflats from medium-to-coarse resolution satellite imagery and field measurements

    • Authors: Augustijn, Ellen-Wien;  Advisor: -;  Participants: - (2013)

  • Intertidal sediments are critically important in controlling intertidal mudflat microphytobenthic primary productivity and the functioning of intertidal ecosystems. This paper demonstrates the possibility of deriving different intertidal sediment properties from coarse-to-medium resolution remote sensing imagery. Supervised and image based classification methods were used to map different substrate types based on the Spectral Angle Mapper (SAM) algorithm. The algorithm characterized different sediment properties from remote sensing data based on field collected and image-extracted endmembers. The results demonstrate that, different substrate types can be derived from coarse-tomedium resolution images using SAM algorithm. Supervised and image-based classification methods performed we...
  • LT

  • Clear vision on tubid water : the Naivasha Lake :Powerpoint

    • Authors: Salama, M.S.;  Advisor: -;  Participants: - (2013)

  • This lecture presents: Hydro optical models; Results of the empirical model: CDOM, Chl-a, Kd; Cal/Val of the empirical models; Semi analytical including NAP; Depth profile of Kd: a new method.
  • BB

  • Generation and weighting of 3D point correspondences for improved registration of RGB-D data :ISPRS Workshop laser scanning, 11-13 November 2013, Antalya, Turkey

    • Authors: Khoshelham, K.;  Advisor: -;  Participants: - (2013)

  • Registration of RGB-D data using visual features is often influenced by errors in the transformation of visual features to 3D space as well as the random error of individual 3D points. In a long sequence, these errors accumulate and lead to inaccurate and deformed point clouds, particularly in situations where loop closing is not feasible. We present an epipolar search method for accurate transformation of the keypoints from 2D to 3D space, and define weights for the 3D points based on the theoretical random error of depth measurements. Our results show that the epipolar search method results in more accurate 3D correspondences. We also demonstrate that weighting the 3D points improves the accuracy of sensor pose estimates along the trajectory
  • BB

  • Cucumber (Cucumis sativus, L.) water use efficiency (WUE) under plastic mulch and drip irrigation

    • Authors: Arslan, A.; Yaghi, T.;  Advisor: -;  Participants: - (2013)

  • The results of the study indicated that (DI + TM) treatment excelled all other treatments at yield and water use efficiency (WUE), where its yield was 63.9 t ha−1, and (WUE) was 0.262 t ha−1 mm−1, while (DI + BM) treatment produced 57.9 t ha−1, with a (WUE) of 0.238 t ha−1 mm−1. However cucumber yield and WUE declined in the remaining treatments of no mulch (DI) and (SI) to reach 44.1 t ha−1 with 0.153 t ha−1 mm−1 and 37.7 t ha−1 with 0.056 t ha−1 mm−1, respectively. The results showed that (DI + TM) treatment gave the highest soil temperature and moisture during both of the seasons in comparison to (DI + BM). This enhanced its vegetative growth and almost doubled its productivity compared to the SI treatment.
  • BB

  • Effects of building primitive library and automatic correction of roof typology graph :ISPRS Workshop laser scanning, 11-13 November 2013, Antalya, Turkey

    • Authors: Li, Longhui;  Advisor: -;  Participants: - (2013)

  • The reconstruction of 3D building models has been extensively researched in the last decade. The model driven methods, which fit building parts to predefined building primitives and glue them together into complete buildings, have been proved to be powerful. This paper solves two open questions left in prior works. Firstly, the primitive building libraries defined in literature are limited to few types of building structures. Therefore the undefined types of buildings could not be well represented by the primitive libraries. Secondly, the roof topology graphs used for interpreting the roof structures are assumed to be correct in previous works. In many cases, however, the roof topology graphs are inevitably wrong because of outliers in input data and errors in their construction ste...
  • LA

  • Efficient simulation techniques for stochastic model checking

    • Authors: Haverkort, B.R.H.M.; Reijsbergen, D.;  Advisor: -;  Participants: - (2013)

  • Thesis present an overview of the known hypothesis tests from the statis- tical model checking literature and cast them into a single framework; consider (parallel networks of) birth-death processes, and discern several asymptotic regimes that all lead to different typical behaviour to reach the rare event; present an algorithm for importance sampling in general Markov chains; demonstrate how the procedure that is used to obtain the change of measure; present a formal algorithm that obtains the information required to construct a good change of measure from a high-level SPN-description, without generating the full state space.