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面向对象的SPOT5图像森林分类研究
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摘要
遥感图像森林分类是遥感技术在森林资源监测应用中最基础、最重要和最关键的工作。几十年来,遥感图像分类无论在理论上,还是在技术上都取得了长足的进步,但仍不能满足大面积实际应用需要,尤其是在森林分布破碎、类型多样、结构复杂的南方林区,遥感图像分类精度还有待于进一步提高。近年来,随着高空间分辨率航天遥感图像的容易获取,遥感技术在森林资源监测中应用前景十分良好。面向对象分析方法的提出和发展,为遥感图像森林分类提供了一个极有希望的途径。然而,现有的遥感理论和技术大多是基于中低分辨率图像、针对像元分析建立起来的,对于高空间分辨率图像、对于具有丰富含义的图像对象,需要从图像处理到信息提取、分类等各个方面都进行深入的研究。本文以改善SPOT5图像森林分类精度为目的,从图像预处理、图像分割、ETM+辅助数据的应用、对象的光谱和纹理特征提取与筛选、多分类器分类与结合等整个流程进行了全面的、系统的和综合的探索和研究,主要成果如下:
     1)以采集高分辨率遥感几何精校正地面控制点(GCPs)和林业调查规划应用为目的,建立了林区GPS控制网。布网结果表明,基于该控制网的星站差分GPS单点定位精度RMS均小于0.5m,完全能够满足高空间分辨率的SPOT5、IKONOS和QuickBird等图像几何精校正GCPs采集的需要,解决了传统基于地形图选点和普通手持式GPS定位方法无法满足高分辨率遥感图像几何精校正精度要求的问题。在GPS控制网的支持下,普通手持式GPS的单点定位最大误差为3.86m,小班边界平均位移为3.23m,小班中心绝对位移平均为3.76m,小班面积测量精度达到98%以上,完全能够满足林业生产实际应用需要,且操作简便,工作效率高,适用于大范围的森林资源调查。建立林区GPS控制网是在当前普遍缺乏高精度地面控制点的情况下,进行高空间分辨率遥感数据几何精校正的有效途径。
     2)比较全面地探讨了森林资源监测用SPOT5图像预处理的技术方法。试验结果表明,IHS变换融合和双线性内插法重采样在空间信息、纹理信息和光谱信息保持方面,均具有良好的效果。分段线性拉伸和边缘增强处理,有利于突出森林信息,有助于提高图像解译的精度。
     3)研究了SPOT5图像结合Landsat ETM+图像进行图像分割和对象特征提取的策略,探讨了对象特征的筛选方法。ETM+图像由于空间分辨率相对较低,不能实质性地参与图像分割过程,否则会造成图像对象同质性差、“杂质”多,边界不准确,不能准确地反映地物空间分布状况。在人工林区,光谱信息和纹理信息是森林分类最有价值的信息。采用协方差、简单相关性和多重相关性进行对象特征筛选后,可剔除大部分对象特征,并保持对象特征原有含义不变、相互独立和具有一定的信息量,为后续分类器应用提供了可靠保证。
     4)提出了图像分割—基于规则的分类—基于分类的分割—分区控制—底层分类—上层综合的高空间分辨率遥感图像(SPOT5图像)森林分类策略。试验了最小距离法、马氏距离法、Bayes准则、模糊分类法和支持向量机5个分类器,结果表明,Bayes分类器的总体精度最高,且各类型的生产者精度亦保持较为接近,对以龄组为基础、包含22个类型的第三级分类的总体分类精度达到了79.38%,以树种为基础的、包含15个类型的第二级分类的总体精度达到了81.82%,以树种组为基础的、包含9个类型的第三级分类的总体精度达到了86.33%。在景观复杂地区的森林分层分类,由底层分类开始、逐级向上合并的方法,比由顶级分类开始、往下逐级分类的方法,效果更好。ETM+作为辅助数据,较大程度地提高了SPOT5图像的分类精度。
     5)研究了多分类器结合方法,发展了多分类器结合的投票/模糊法,该方法综合了保守投票规则和模糊融合方法,通过结合5个分类器的研究表明,该方法与标准结合方法、模糊融合方法相比,效果更好。多分类器结合后,总体分类精度有一定的提高,但提高幅度不大。
The classification of forest cover is the most important and essential task in employing remote sensing to forest resources inventory and monitoring.Obvious advancement had been achieved in theory and technology during past decades,thought the classification can still not full met the need of practical application,for the classification accuracy need to be further improved in the southern China,where were with fragmentized distribution of forest,species and types diversity,and complex structure.With the high spatial resolution remote sensing data are available recent years,remote sensing can be expected to applicate wildely in forest resources monitoring,and object-oriented methodology also provides us a hope method to image analysis.However,the existing theory and technology of remote sensing had been built on low or medium resolution imagery and based on pixel,so it is important and urgent to keep on study to imagery process,information extract,imagery classification for the high or very high resolution imagery and meaning object.Aiming toward improve the classification accuracy of SPOT5 imagery,a synthetical and systemic research was focused on the image processing,image segmentation,employment of Landsat 7 ETM+ image as ancillary,spectral and texture features extraction and selection,forest cover classification with multi-classifiers and combination,the main works and result are showed following:
     1)To collect the ground control points(GCPs)for the geometric correction of the hi-spatial resolution remote sensing imagery and employment in forest resources inventory and planning,a GPS control network was found in the study area.The test results indicated that,the RMS error of single plot of GCPs positioned by WADGPS was lower than 0.5 m, which completely met the demands of geometric correction of the high-spatial resolution remote sensing image,such as SPOT5,QuickBird and IKONOS.Using GPS control network as the reference station and solving the high-precision coordinate conversion parameters,the largest RMS error of single plot positioned by portable GPS was 3.86 m.The average boundary displacement and absolute displacement of sub-compartment's center were 3.23 m and 3.76 m respectively and the accuracy of area survey was higher than 98%,which full satisfy the practice implication.The accuracy and efficiency of the application of GPS in forest district was improved effectively after establishing the GPS control network.
     2)SPOT5 data processing methods for forest resources inventory in south china were studied.It was indicated that fusing data using IHS transformations and resampling by bilinear interpolation took much advantages in preserving spatial,texture and spectral information of image than any other methods,linear stretching by segment and edge enhancement were helpful to reveal forest information and improve classification accuracy.
     3)The strategy of imagery segmentation and information extraction combining SPOT5 HRG imagery and Landsat 7 ETM+ imagery was studied,and the selection method of object features was discussed.ETM+ data couldn't take part in the imagery segmentation,for their coarser resolution would reduce the homogeneity within objects,lead to the objects contained impurities and couldn't represent the distribution of forest cover exactly.Spectrum and texture were most useful object features for the classification of forest cover in plantation.Most object features had been eliminated after selected by covariance,sample correlative coefficient and multiple correlative coefficient,the features remained were with the specific meaning,independence with each other,and had definite information.
     4)A five-step object-oriented classification routine was present to do classification on SPOT5 imagery,it included imagery segmenting,rule-based classifying,classification-based segmenting,area control,multi-classifier classifying and combining,topper layer synthesizing. Five classifier were employed to the classification,included minimum distance classifier, Mahalanobis distance classifier,Bayes rule classifier,fuzzy classifier and support vector machines.The result of classification indicated that in the study area with the fragmentized distribution forest,species and type diversity,complex structure,with the Bayes classifier,the total accuracies of the third level,the second level and the first level were 79.38%,81.82% and 86.98%respectively,where the third level contained twenty-two class based on age-group of trees,the second level contained fifteen class based on species,and the first level included nine class based on species groups.Bayes rule classifier also got the closely producer accuracies of all classes.With hierarchical classification,the result of beginning from the low layer and then synthesizing upward topper-layer was better than that classifying from top-layer to low layers.Used as ancillary data,Landsat 7 ETM+ data were helpful to improve the classification accuracy of SPOT5 imagery.
     5)The combination methods of multi-classifier were studied,a new combination method, defined as voting rule/fuzzy fusion,had been developed,which combined the conservative voting rule and fuzzy fusion.It got the better result than voting rule and fuzzy fusion through the test of combining five classifiers.The accuracy had been improved by combining classifiers,although the improvement was not as obvious as expected previously.
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