排序方式： 共有125条查询结果，搜索用时 31 毫秒
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以ETM多光谱数据与SPOT5全色数据融合的遥感图像为对象,利用遥感图像和地面调查相结合的方法对吉林省东部山区进行森林资源调查,既可节约成本,又可提高调查精度,为遥感技术应用于森林资源调查设计探索了经验。 相似文献
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A method for mapping the distribution of willow at a catchment scale using bi-seasonal SPOT5 imagery 总被引：1，自引：0，他引：1
This study showed that seasonal imagery acquired at specific stages of phenology can be used to improve the mapping accuracy of invasive willow at a catchment scale. SPOT5 XI (10 m) satellite imagery was acquired for early autumn and winter to represent the phenological stages of leaf cover and leaf fall respectively. Four classification regimes were evaluated using single‐ and bi‐seasonal composite imagery to determine the most accurate method. Significant spectral noise was found in willow populations, especially in the winter image, due to the effects of undergrowth exposure, shadowing, topography and boundary‐mixed pixels. Two noise reduction techniques were applied to the bi‐seasonal composite image to improve the classification results. The noise‐reduced bi‐seasonal composite image was classified using the spectral angle mapper (SAM) algorithm before importation into a geographical information system. Aerial photography was used to reduce the errors of commission associated with misclassification of pastures. The class accuracy achieved for willow using the method described in this study was 77.5% (Kappa =0.87). The high cost of eradicating willow means that managers must establish priorities for control; this technique can provide a powerful tool for prioritizing control programmes and for monitoring results at a catchment scale. 相似文献
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《Southern Forests》2013,75(3):227-236
This study assessed the suitability of both visible and shortwave infrared of ASTER reflectance bands and various vegetation indices for estimating forest structural attributes of Eucalyptus species. The study was conducted in even-aged monoculture plantations of E. grandis and E. nitens in the southern KwaZulu-Natal Midlands of South Africa. Empirical relationships between forest structural attributes, i.e. stems per hectare (SPHA), diameter at breast height (DBH), mean tree height (MTH), basal area and volume, and ASTER data were derived using correlation and canonical correlation analysis (CCA). The results indicated weak relationships between the studied forest structural attributes and ASTER data. In the younger plantation stands (4–6 years) the adjusted R 2 values from CCA regression for SPHA, DBH, MTH, basal area and volume were 54.2, 63.5, 33.8, 25.4 and 30.3, respectively. The adjusted R 2 values in the mature stands (7–9 years) were distinctly weaker with values of 50.7, 55.8, 25.1, 20.2 and 27.3 for SPHA, DBH, MTH, basal area and volume, respectively. The results imply that ASTER satellite data are not applicable to forest structural attribute estimation in commercially managed forest stands. 相似文献
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SPOT5卫星遥感信息在森林资源调查中的应用现状与解决思路 总被引：10，自引：0，他引：10
介绍利用SPOT5卫星遥感在云南省森林资源调查中的应用情况,总结所取得的成果经验。分析存在的包括对遥感的内涵认识不足、特殊地类不易分辨、树种组成难判读、蓄积量不能直接判读、龄组和郁闭度判读因子粗放等问题,提出了解决问题的思路和建议。 相似文献
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VEGETATION数据的植被指数,受云雾影响,含有大量的噪声信号,使用之前必须进行去噪声处理.结合实例数据介绍了半中值滤波法、半均值滤波法、等间隔极大值法用于植被指数的去噪声处理,效果良好;该处理方法同样适用于NOAA和MODIS等数据的植被指数预处理. 相似文献
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基于SPOT5遥感影像的样地判读 总被引：3，自引：0，他引：3
利用SPOT5卫星遥感资料在沾益县大坡乡进行了森林资源二类调查试点。共布设目视判读样地7711个、野外实测样地290个,其总体抽样精度为87 29%。介绍了工作方法,分析了判读结果和存在问题,提出了今后工作的思路。 相似文献
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VEGETATION植被指数与森林资源的相关性分析 总被引：1，自引：0，他引：1
周科松 《中南林业调查规划》2005,24(2):34-36,41
VEGETATION植被指数与森林资源特征因子之间的相关性是该遥感数据用于森林资源监测的基础.基于湖南省同期的连清样地资料、ETM卫片,采用统计分析、单因素方差分析、迭加观察等方法,对VEGETATION植被指数与森林资源特征因子之间的相关性进行了分析,发现两者之间存在较高的相关性. 相似文献
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SPOT5在小流域水土保持生态建设遥感监测中的应用 总被引：1，自引：1，他引：0
在伊洛河赵沟小流域应用SPOT5卫星影像开展水土保持生态建设遥感监测,以制作流域"4D"产品为基础,基于虚拟地理信息系统构建赵沟小流域虚拟现实环境进行定义分类模板技术研究,整体分类模板定义精度可达95.48%;进而对SPOT5卫星影像实施水土保持措施遥感监测分类处理,运用ERDAS IMAG INE精度评价统计功能对虚拟现实环境参照下的水土保持措施分类结果进行评价,总体分类精度达到80.49%;对各地物类型和总体Kappa系数进行分析,总体Kappa系数达到0.769 4。研究表明,SPOT5在大规模水土保持生态建设遥感监测中具有很好的应用前景。 相似文献