采用OSM和轨迹数据提取地表覆盖增量信息

Extraction Method of Land Cover Change-only Information Based on OSM and Trajectory Data

目前我国研制的全球地表覆盖数据产品已上线使用,保持该数据集的现势性,及时发现全球地表覆盖增量信息并更新相应数据成为该领域的关键问题。鉴于已存在大量开源地图(Open Street Map,OSM)矢量和众源轨迹数据,本文提出了一种结合OSM矢量和众源轨迹数据提取地表覆盖增量信息的方法。比较分析了OSM面数据、OSM线面数据单独提取地表覆盖增量信息,轨迹数据提取人造地表增量信息和组合数据(OSM面数据加轨迹数据和OSM线面数据加轨迹数据)提取地表覆盖增量信息的精度。试验结果表明,采用OSM矢量与轨迹数据提取地表覆盖增量信息的方法比单一数据提取地表覆盖增量信息的方法总体精度更高,总体精度从85.73%提高到88.07%。通过比较分析,验证了OSM矢量与轨迹数据提取地表覆盖增量信息的可行性。

At present, the global land cover data products developed in China have been started to use. In order to maintain the currency of the dataset, to discover the global land cover change-only information and update the corresponding datasest in time is one of the key issues in this field. In view of the existence of a large number of Open Street Map (OSM) vector and crowd-sourcing trajectory data, this paper presents a method to extract the land cover change-only information combining OSM vector and crowd sourcing trajectory data. It compares and analyzes the accuracy of using OSM surface data, OSM line surface data separately to extract land cover change-only information, trajectory data extraction artificial surface change-only information and combined data (combining OSM surface data with trajectory data and combining OSM line and surface data with trajectory data) to extract land cover change-only information. The experimental results show that in the extraction of land cover change-only information, the method of extracting change-only information by combining OSM vector with trajectory data is more accurate than the method of using single data extraction. The overall accuracy is improved from 85.73% to 88.07%. Through comparison and analysis, the feasibility of extracting change-only information by combining OSM vector with trajectory data is verified.