In order to improve using accuracy of agricultural GPS, by analyzing the error of point, polyline, polygon, several methods are produced such as arithmetic average value, least squares, adding control points, etc. Their principles, features and limitations are also analyzed and discussed.
为了进一步提高农用GPS的使用精度，研究了提高精度的方法，通过对点、线、面等误差的分析，提出了应用算术平均值法、最小二乘法、加入控制点法等多种提高精度的方法，分析和讨论了它们的原理、特点与应用局限性，并建立了加入控制点法中的误差平差法的数学模型。
参考来源 - 农用GPS的通讯技术与使用精度提高方法的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
A simplified algorithm of nonlinear principal curves called nonlinear principal poly line is developed and its effect for feature extraction of hyperspectral data is researched.
并对非线性主折线算法用于高光谱遥感数据特征提取的效果进行研究和讨论。
However, the spatial data model of main GIS systems only reflect knowledge of management and manipulation objects in field of cartography, such as point, line and poly geometry objects.
当今的GIS系统的空间数据模型，主要反映地图制图领域的点、线、面对象管理与操作的几何知识。
This detector line array is fabricated using 2 micron design rule and a double level poly silicon structure.
器件采用最小2微米设计规则，两层多晶硅结构。
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