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triangle method for Estimating Soil Surface Wetness from Satellite Imagery in Allahabad District, Uttar Pradesh, India

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Journal of Geoscience and Environment Protection 2016年第1期4卷 84-92页

作者： Abba Aliyu Kasim Abubakar Aminu Usman Department of Soil Water Land Engineering & Management Sam Higginbottom Institute of Agriculture Technology & Sciences Allahabad India

Soil surface wetness is indispensable land surface parameter in agriculture, hydrology and environmental engineering. This paper explores the relationship between surface radiant temperature and fractional vegetation cover derived from satellite imagery to estimate soil surface wetness (triangle method) in Allahabad district. The pixel distributions create triangular shapes because the range of surface radiant temperature decreases as the amount of vegetation cover increases and sufficient number of pixels exists. A very weak correlation is found between the simulated soil surface wetness and ground measured soil moisture at deeper soil layers (R2 triangle especially at lower left edge of the triangle. This distortion is removable. The spatial and temporal inhomogeneity of soil surface wetness is examined.

关键词： triangle method Soil Surface Wetness Surface Radiant Temperature Fractional Vegetation Cover

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Discrimination of Junctions in Line Drawing by Computer

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Computer Aided Drafting,Design and Manufacturing 2010年第1期20卷 99-103页

作者： YANG En DONG Li-jun Institute of Mechanical Engineering Taiyuan University of Technology Taiyuan 030024 China

For discrimination of the common W-junction and Y-junction in the labels of line drawing for a three-dimensional manifold plane surface with trihedral vertices, the existing algorithms are almost using angles between two adjacent lines and W-junction and Y- junction＇s definitions, and other complex methods. This passage gives four methods with their detailed mathematical inference processes in order to use these algorithms implemented by computer. The algorithms listed are Angle Summation method and Points to the Line method, triangle methods which are the triangle Area method and the Cross method. When the computer programs discriminate junctions, by comparison, the Angle Summation method and Points to the Line method are less efficacious than the triangle method, and Cross method is more efficacious than the triangle Area method in the triangle method.

关键词： line drawing labeling junctions angle summation method points to the line method triangle method

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