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Browsing by Author Wang, Y.

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  • Map based segmentation of airborne laser scanner data

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

  • The task of segmenting point clouds is to group points that belong to the same (part of an) object. In this project we make use of an existing topographic map as a kind of background layer to segment point clouds acquired by airborne laser scanning systems. This map is an object based representation into polygons which are labelled into topographic classes like buildings, roads, terrain, water and vegetation. We implemented a point-in-polygon operation which is succeeded by a relabeling step at locations of roof overhangs. Next, the topographic class of the object is used to correctly process the point cloud into meaningful segments. The type of segmentation, e.g. planar or smooth seg...
  • BB

  • Map based segmentation of airborne laser scanner data

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

  • The task of segmenting point clouds is to group points that belong to the same (part of an) object. In this project we make use of an existing topographic map as a kind of background layer to segment point clouds acquired by airborne laser scanning systems. This map is an object based representation into polygons which are labelled into topographic classes like buildings, roads, terrain, water and vegetation. We implemented a point-in-polygon operation which is succeeded by a relabeling step at locations of roof overhangs. Next, the topographic class of the object is used to correctly process the point cloud into meaningful segments. The type of segmentation, e.g. planar or smooth seg...
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  • Policy Analysis of Agricultural Water Fee Collection in China

    • Authors: Chen, S.; Wang, Y.;  Advisor: -;  Participants: - (2013)

  • The low collection rate of agricultural irrigation water fee is a common problem facing many developing countries, which has also troubled China since the 2000s. In different areas of China, there are two problem-solving strategies: raising water collection rate or exempting water fee. In this paper, we analyze the dilemma of China's agricultural water fee collection from both practical and theoretical perspective. We argue that China will not follow up one single model in agricultural water fee collection and each local government should explore appropriate policy in line with their own situation.
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  • Water Movement and Finger Flow Characterization in Homogeneous Water‐Repellent Soils

    • Authors: Wang, Y.;  Advisor: -;  Participants: Wang, X.; Chau, H.W.; Si, B.; Yao, N.; Li, Y. (2018)

  • Soil water repellency (SWR) is a widespread property in soils around the world. It influences soil water movement and causes unstable flow. The mechanics of finger flow occurrence in water‐repellent soils are not clearly understood. Slab chamber infiltration experiments consisting of increasing SWR persistence in clay and sandy loam soils were conducted to compare wetting front advancement and mechanics of finger flow development. The temporal variation curves of cumulative infiltration (CI) decreased with an increase in SWR persistence. For wettable soils, the wetting front advanced regularly with time, but for water‐repellent soils, it became unstable and finger flow occurred as the...