Detection of Detail Land Cover Change by Use of Digital Data from Air Survey

土地转角利用及其变化趋势是各类区域规划的基础数据。这意味着根据规划或项目的目的，土地覆盖数据的必要特征应因项目而异，或适当的材料应因项目而异。至于日本，我们已经有了土地覆盖和土地利用地图等基础调查数据。然而，由于我们无法多次检查，调查数据过时是一个瓶颈。改善这种情况的一种方法是尽快发现变化的地方。在发现变更地点后，检查该地点的详细土地收敛情况并不困难。在此基础上，利用CCD线传感器采集的数据，研究了变化位置的检测方法。在一个总的场所检测系统中，主要研究的课题如下。最重要的问题是几何精度。为了实现图像的准尺寸定向，考虑了地面测量误差的特点，确定了定向参数。(2)改进了基于图像相关性的数字立体匹配技术，实现了图像的自动匹配，但仍存在一定的失匹配现象。(3)研究了利用不同日期两幅图像的密度差产生的几种图像类型的变化检测方法。主成分图像也包括在内。在本研究中，考虑简单的决策树。

Land coner land use and a trend of them are fundamental data for every type of regional planning. This means that according to the purpose of a planning or project, the necessary characteristics of land cover data should be different, or suitable materials differ from project by project. As to Japan, we already had land cover and land use maps and other fundamental survey data. However, it is a bottleneck that the survey data are outdated because we can not check up so many times. The one way to improve this situation is to detect changed places as soon as possible. After the changed places were found, It is not difficult to check up detail land converges in that places. Based on these considerations, Detection methods of changed places were investigated by use of the data obtained from CCD line sensors. In a total system to detect changed places, the main subjects investigated are as follows. (1) The most important subject is geometrical accuracy. In order to perform presize orientation of images, the orientation parameters are determined under consideration of the characteristics of errors in ground surveys. (2) Techniques of digital stereo-matching by use of image correlations are improved in order to realize an automatic processing, but miss-matchings still take place a little. (3) Change detection methods by use of several types of the images which are produced by dencity differnces of two images obtained on different dates are investigated. Principal component images are also included. In this study, simple decision trees are considered.