大区域Landsat影像数据的一体化镶嵌处理方法与研究

Treatment Methods and Research on Regional Integration Based on Data of the Landsat Images Mosaic

遥感图像镶嵌技术将两幅或多幅遥感图像拼接合成全景图像,以满足宽幅图像的应用需求。由于不同地区间差异明显,镶嵌处理流程均不相同。针对特别区域提出了适合该区域的不同时相遥感图像镶嵌的流程。对数据进行选取和分析,对波段进行选择与叠加,对图像进行辐射校正、几何校正和投影转换的预处理。选用递推式、灰度调整、滑动窗口探测最佳拼接点及对其两侧作加权灰度圆滑处理措施,选用中等分辨率成像光谱仪的大区域图像对Landsat色调一致性处理以消除被镶嵌图像之间因色调不同形成的接缝,利用ERDAS软件对大区域影像进行影像镶嵌成为全景图像,由于数据量大,采用交互式数据语言来调用ENVI提供的接口以减少运行时间。以新疆为例,从数据的分析、波段的选择与叠加、影像预处理等,按照遥感影像镶嵌流程制作成新疆影像地图,对其进行评价与分析。通过该影像镶嵌流程,可以快速有效地制作成适用于图像分析处理的影像地图。

In this paper,a simple and practical process for remote sensing image mosaic of different time domain suitable for this area is proposed.First of all,the selection and analysis of data,the selection and superposition of bands,image pretreatment mainly includes radiation correction,geometric correction and projection transformation.This paper selects the recursive type,gray scale adjustment,sliding window to detect the best splicing and weighted gray smooth measures on both sides.A large area image of moderate-resolution imaging spectroradiometer（MODIS）is used to deal with the consistency of the Landsat hue to eliminate the seams formed by different colors between the mosaic images.And then ERDAS software is applied to mosaic large area images into panoramic images.Due to the large amount of data,using IDL（interactive data language）programming to invoke the ENVI provided interfaces,which greatly improves the running time.Then taking Xinjiang as an example,from the selection of data,the band selection and superposition,and image pretreatment,in accordance with the above remote sensing image mosaic process,we made a map of Xinjiang image.Finally,the mosaic images of Xinjiang are evaluated and analyzed.Through this set of image mosaic process,it can be quickly,effectively and conveniently made into an image map suitable for image analysis and processing.