多分辨率协同遥感地块利用分类方法研究

Remotely Sensed Land Patch Classification by Collaborating with Multi-Resolution Data

遥感影像的获取受卫星、传感器设计、大气条件等限制,往往难以兼顾时间和空间分辨率,导致由单一来源数据提取遥感信息难度较大,难以满足各种应用对信息时空分辨率越来越的需求。由此出发考虑多源数据的不同优势及其随着周期运行不断积累的多时相数据,设计了基于地块协同多种分辨率甚至多源数据的分类方法。以高空间分辨率影像为地理基准构建稳定地块分布图,这些地块在一定时间内边界与基本属性相对稳定,由此可以协同利用高时相分辨率数据反映地块在不同时间点的光谱表现,分别计算形成地块的时相变化特征,根据地类各自特点选择不同方法与数据特征完成解译,总体上以地块级监督分类完成具体类别解译。在2014年夏季青海玛多的米级土地利用分类实验中,整个植被生长季的中分数据以及冬季无云高分数据被收集用于协同分类,在解决多数据匹配、合成的基础上充分利用各数据的优势,对建设用地、水体、植被等关键类别区别对待,整体上取得了较高的解译精度,不但有效克服传统视角下数据源不足、信息缺失等问题完成了全县解译,而且保证了土地信息的时空分辨率,为生态调查与保护提供了最新最全数据支持。

The obtaining of remotely sensed imagery may affected by design of satellite, sensors, and atmospheric conditions.Normally it is difficult to balance the temporal and spatial resolution. Which leads to the hard of information extraction from a single source remote sensing data.Obviously this may impossible to meet the application demand which ask for higher and higher resolution information on spatial and temporal. Considering the different advantages of multi-source data and the accumulation of the multi- temporal data by time,we design the classification method based on the patches for multi- source data. The patches are basic geographical units which are relatively stable on boundary and properties. With these patches, other data may reflect the spectrum performance at different time or different point of view. After calculating these features we can interpret the patches with adapt methods based on the characteristics of each land class.In the land use classification experiment of Maduo in summer of2014, many data are collecting for cooperating classification. Long term middle resolution data cover the whole vegetation growing season and cloudless high resolution data in winter are used after solving the problem of geo- matching and multi- source compositing. Because of different advantages of these data, categories like built up, water, vegetation are interpreted separately. At last we get a high total accuracy. Not only effectively overcome the traditional perspective of insufficient data source, lack of information and complete the interpretation of the county.But also ensure the spatial and temporal resolution of land information.