遥感影像在土地调查中山区耕地的解译难点与技术要点
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摘要
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.
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.
引文
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[2]杨博,刘义.农业遥感影像目视解译技术要点[J].现代化农业,2008(4):37-39.
[3]江涛.遥感影像解译标志库的建立和应用[J].地理空间信息,2010(5):31-33.
[4]梅安新,彭望琭,秦其明,等.遥感导论[M].北京:高等教育出版社,2001.
[5] YOON J J,KOCH C,ELLIS T J. Shadow flash:An approach for shadow removal in an active illumination environment[C]//Proceedings of the 13rd British Machine Vision Conference. Cardiff,UK:INSPEC,2002:636-645.
[6]王树根,李德仁,郭泽金,等.正射影像上阴影和遮蔽的信息处理方法研究[J].测绘信息与工程,2004(4):1-4.
[7]刘健,许章华,余坤勇,等.山地丘陵区遥感影像阴影检测与去除方法[J].农业机械学报,2013(10):238-241.
[8]HUANG J F,XIE W X,TANG L. Detection of and compensation for shadows in colored urban aerial images[C]//The 5thWorld Congr Intelligent Control and Automation,IEEE Meetimg. Zhejiang:Zhejiang University,2004:3098-3100.
[9] AKIRA S,AKIO S,HIROYUKI A,et al. Dynamic shadow compensation of aerial images based on color and spatial analysis[C]//International Conference on Pattern Recognition. Beijing:Uwe Stilla Technical University of Munich,Germany,2000.
[10]杨俊,赵忠明,杨建.一种高分辨率遥感影像阴影去除方法[J].武汉大学学报(信息科学版),2008(1):17-20.
[11]王卫国.高空间分辨率遥感影像阴影处理方法研究[D].西安:西安科技大学,2008.
[12]易湘生,马尚杰,游炯,等.遥感调查中耕地解译面积精准核算[J].农业工程学报,2016(Z1):169-176.
[13] SENTHILNATH J,RAJESHWARJ M,OMKAR S N. Automatic road extraction using high resolution satellite image based on texture progressive analysis and normalized cut method[J]. J Indian Soc Remote Sens,2009(37):351-361.
[14]贾宁凤,王晓雅,耿佳丽.山区农村耕地流转的地形驱动因子分析:以山西省宁武县为例[J].山西农业科学,2017,45(12):2026-2031.
[15]陈艳丽,李少梅,刘岱岳.基于规则格网DEM的坡度坡向分析研究[J].测绘与空间地理信息,2009(5):36-39.
[16]毕华兴,谭秀英,李笑吟.基于DEM的数字地形分析[J].北京林业大学学报,2005(2):49-53.
[17] ZHANG W,MONTGOMERY D R. Digital elevation model grid size,landscape representation,and hydrologic simulation[J]. Water Resources Research,1994(30):1019-1028.
[18]覃振生.农户耕地撂荒影响因素研究:以博白县宁潭镇、凤山镇为例[D].南宁:广西师范学院,2015.
[19]ZHANG Y,LI X,SONG W. Determinants of cropland abandonment at the parcel,household and village levels in mountain areas of China:A multi-level analysis[J]. Landuse Policy,2014,41:186-192.
[20] MACDONALD D,CRABTREE J R,WIESINGER G. Agricultural abandonment in mountain areas of Europe:environmental consequences and policy response[J]. Journal of Environmental Management,2000,59:47-69.
[21]胡敏,王成超.劳动力非农转移对农户耕地撂荒的影响[J].亚热带资源与环境学报,2013(2):56-63.