遥感影像在土地调查中山区耕地的解译难点与技术要点

Difficulties and Technical Points of Interpretation of Cultivated Land in Mountainous Areas in Remote Sensing Imagery

遥感影像的解译是土地调查过程中的重要部分,解译的精度直接影响着调查的结果,探索适合的影像处理、解译方法对于调查工作具有重要的意义。以解译难度大的山区为研究对象,简述了山区影像识别的具体程序,提出了山区耕地解译过程中边界解译、面积精准核算、撂荒耕地解译3类有代表性的问题,并针对这些问题对调查的影响,探索了相应的解决办法。结果表明,对不规则耕地和阴影区耕地2种有边界识别困难的耕地类型采用对比度增强、阴影补偿等方法处理影像,能增强边界的可解译性,并以调查正射影像为例展示了这些方法对于耕地边界解译的作用;对于小地物与坡地对耕地面积精准核算的影响,列举了几种影响广泛的小地物的解译标志与解译方法,指出利用坡地的坡度坡向对坡地面积进行校正的方法;对于撂荒耕地的解译,提出应用不同季节影像解译的方法。

Interpretation of remote sensing images is an important part of the process of land survey. The accuracy of interpretation directly affects the results of the survey, and it is of great significance to explore suitable methods of image processing and interpretation.This paper takes the difficult mountain region as the research object, briefly describes the specific procedure of mountain region image identification, and puts forward three representative problems in the interpretation process of cultivated land in mountain region, including boundary interpretation, accurate calculation of area, and interpretation of abandoned cultivated land. In view of the influence of these problems on the investigation work, the corresponding solutions are explored. The results show that the contrast enhancement, shadow compensation and other methods are used to process the images of two types of cultivated land with difficulty in boundary recognition, which are irregular cultivated land and shadow region. For the influence of small features and slope land on the accurate calculation of cultivated land area, several interpretation signs and interpretation methods of small features that have a wide range of influence are listed, and the method of using slope slope to correct the slope area is pointed out. This paper puts forward the method of image interpretation in different seasons for the interpretation of abandoned farmland.