Texture Analysis for Mapping Tamarix parviflora Using Aerial Photographs along the Cache Creek, California
Texture Analysis for Mapping Tamarix parviflora Using Aerial Photographs along the Cache Creek, California
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DOI：
10.1007/s10661-006-1071-z
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发表时间：
2006-03
影响因子：
3
通讯作者：
S. Ge;R. Carruthers;P. Gong;Angelica M. Herrera
中科院分区：
文献类型：
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作者：
S. Ge;R. Carruthers;P. Gong;Angelica M. Herrera
自然彩色照片被用来检测的覆盖率saltcedar，柽柳小花，沿着40公里的部分卡奇克里克附近林地，加州。对2001年以来的历史航空照片进行了回顾性评价，并与实际地面资料进行了比较，以评估评估过程的准确性。彩色航空照片依次进行数字化，地理参考，分类使用颜色和纹理的方法，并镶嵌成地图供外地使用。从数字化照片中选取8种地被类型（柽柳、农作物、道路、岩石、水体、万年青乔木、非常绿乔木和灌木（不包括柽柳））进行可分性分析和监督分类。由于八种封面类型之间的颜色相似性，最初仅基于颜色的平均可分离性非常低。通过加入纹理分析，可分离性得到显著提高。六种类型的纹理措施与不同的窗口大小进行了评估。最好的纹理被用作附加特征沿着的颜色，用于识别柽柳。共29张彩色照片进行了处理，以检测Tamarixinfestations使用的原始数字图像和最佳的纹理特征相结合。结果发现，盐雪松覆盖了3.96平方公里（396公顷）的研究区域内。为了进行准确性评估，在实地用全球定位系统（GPS）检查了所产生的地图中的95个分类样本，以验证Tamarix的存在。制作者的准确率为77.89%。此外，157个独立定位的地面站点包含saltcedar进行了比较与分类地图，用户的准确率为71.33%。
Natural color photographs were used to detect the coverage of saltcedar,Tamarix parviflora, along a 40 km portion of Cache Creek near Woodland, California. Historical aerial photographs from 2001 were retrospectively evaluated and compared with actual ground-based information to assess accuracy of the assessment process. The color aerial photos were sequentially digitized, georeferenced, classified using color and texture methods, and mosaiced into maps for field use. Eight types of ground cover (Tamarix, agricultural crops, roads, rocks, water bodies, evergreen trees, non-evergreen trees and shrubs (excludingTamarix)) were selected from the digitized photos for separability analysis and supervised classification. Due to color similarities among the eight cover types, the average separability, based originally only on color, was very low. The separability was improved significantly through the inclusion of texture analysis. Six types of texture measures with various window sizes were evaluated. The best texture was used as an additional feature along with the color, for identifyingTamarix. A total of 29 color photographs were processed to detectTamarixinfestations using a combination of the original digital images and optimal texture features. It was found that the saltcedar covered a total of 3.96 km2(396 hectares) within the study area. For the accuracy assessment, 95 classified samples from the resulting map were checked in the field with a global position system (GPS) unit to verifyTamarixpresence. The producer's accuracy was 77.89%. In addition, 157 independently located ground sites containing saltcedar were compared with the classified maps, producing a user's accuracy of 71.33%.