摘要
为研究可见光遥感数据和微波遥感数据在揭示反映岩溶峰丛地貌纹理结构信息上的差异,在对遥感岩溶峰丛地貌电磁波反射成像模型分析基础上,以桂林奇峰镇岩溶峰丛区为研究区,采用ERS-2SAR与Landsat TM7两种遥感影像数据,平行地开展了岩溶峰丛区遥感纹理信息提取、纹理统计分析和频谱分析。纹理统计分析包括均值、方差、信息熵、能量值和相异性等8种纹理特征向量分析。频谱分析为基于二维径向谱的频谱分析。研究表明,对于纹理统计分析,SAR雷达影像数据反映岩溶峰丛纹理信息的丰富程度要优于TM7影像。对于频谱分析,SAR雷达影像与TM7影像在低频段的富氏功率谱形态特征相似,表明两者对于反映具有宽缓形态的岩溶峰丛地貌能力相同。但在中至高频段,TM7影像总体上具有比SAR影像高的能量,因此在中至高频段TM7影像要比SAR影像具有更好地反映微小起伏的岩溶峰丛地貌的能力。这些结论可为岩溶峰丛区遥感工作的数据选择提供依据。
Karst peak cluster is the main type of China karst landform in the South.The texture of the images with this kind of landforms has rich information on Karst topography,geological,hydrological and ecological environment,which is significant for the study of karst ecological environment.In order to compare the capability of texture recognition of optical image data and the microwave image data on karst landforms,on the basis of analysis on the electromagnetic wave reflection imaging model,this paper carried out the texture information extraction,statistical texture analysis and Fourier spectral analysis of the karst peak- cluster area images.Qifeng town in Guilin karst area was selected as the study area,and ERS-2SAR and Landsat TM7data were adopted in the analysis.Statistical texture parameters include mean,variance,entropy,energy value,diversity,etc.Research shows that,for the texture statistics analysis,SAR radar image data reflects the richness of the karst peak-cluster texture infor- mation,which is superior to the TM7image.In the Fourier power spectral,characteristics of the low-frequency of SAR data and TM7images are similar to each other,which mean that these two data has the same ability to reflect the karst peak with wide slow morphological landform;in the medium to high frequency,TM7images have the ability to reflect small fluctuations in peaks better than that of SAR images.
出处
《遥感信息》
CSCD
2013年第6期19-25,共7页
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