LiDAR点云支持下地物精细分类的实现方法

Method of Land Cover Refined Classification Supported by LiDAR Point Clouds

在遥感数据分类中,获取精细的地物类别无疑能够传递更加丰富的信息量,进一步加深对遥感数据的理解和解译。在机载LiDAR点云高程数据的支持下,提出并实现了遥感影像上地物精细分类的方法。为保证高精度地同种地物再划分,综合考虑配准、辅助数据源、首次回波、点云密度及影像空间分辨率4种因素,并重点解决了点云密度与影像空间分辨率不匹配的问题,利用决策树显著地提高了影像上建筑物、植被的分类数量,使点云与影像联合分类的优势得到体现,达到了分类精度与地物类别数量相统一的目的。

In the process of classification in remote sensing data, acquiring greater refinement of the land cover type can deliver undoubtedly more information and further deepen the comprehension and interpretation for remote sensing data. With the support of point clouds elevation data, the method of refined classification in remote sensing image is proposed and achieved out. In order to gain high accuracy of subdividing the same kind of land cover type,four factors are taken into consideration,which includes registration,supplementary data source,first echo and point clouds density and image spatial resolution, and the focus is placed on dealing with the problems of mismatch between point clouds density and image spatial resolution. Decision tree is developed to improve remarkably the classification quantity of buildings and vegeta- tion in this study,which represents superiority of classification of fusing point clouds and imagery and achieves the desired goal of the unity of classification accuracy and quantity.