According to the requirements for the construction of national land survey database,this study proposed a method for identifying the narrow and long vector patches in national land survey.The raster values were calculated by rasterizing the vector patches and performing evolutionary calculations based on their shape features.To achieve a rapid identification of narrow and long vector patches,the narrow and non-narrow areas within the vector patches were differentiated according to the raster values.The identification method proposed in this study could avoid unpredictable factors caused by the topological problems of vector graphics and could improve the accuracy of the identification of the narrow and long vector patches in national land survey,providing an important technical support for the construction of national land survey database.

长期以来,我国自然资源调查监测工作存在诸多问题,如概念不统一、内容有交叉、指标相矛盾等,因此基于对政策改革变化的适应度和针对性的充分考虑,急需形成满足国土与林业管理需要、可组合、可集成、可对照的"一张底图",既适应现行林地管理体系需要,又适应自然资源管理中国土"三调"体系需要,也适应将来山水林田湖草沙整体统一"一套数"的需要.因此,本文以广东省台山市第三次国土调查成果为基础,结合森林资源管理"一张图",利用对象筛选、空间叠加、属性挂接、图形关系处理等技术,对国土"三调"三维底图进行核查修改,对接融合国土"三调"数据、森林资源管理"一张图"中的图斑边界和重要属性信息.

变形监测数据是判断对象是否会发生异常变化的重要依据,但实测数据会被带入噪声,将隐藏其实际变化规律.本文利用含有高斯白噪声的信号来评价两种新的阈值及阈值函数的去噪效果,并评价两种新的阈值及阈值函数在提高预测精度方面的效果.实验表明,较传统的硬/软阈值函数,两种新阈值及阈值函数的去噪效果更优,而且该组合方法提高了预测的可靠性和精度.