Mapping of Asbestos Cement Roofs and Their Weathering Status Using Hyperspectral Aerial Images
Mapping of Asbestos Cement Roofs and Their Weathering Status Using Hyperspectral Aerial Images
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使用高光谱航空图像绘制石棉水泥屋顶及其风化状态图
DOI：
10.3390/ijgi4020928
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
R. Colombo
中科院分区：
文献类型：
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作者：
C. Cilia;C. Panigada;M. Rossini;G. Candiani;M. Pepe;R. Colombo
本研究的目的是：(i)在市区测绘石棉水泥屋顶；(2)建立与顶板风化状态相关的光谱指标。通过多光谱红外和可见光成像光谱仪（MIVIS）传感器采集航拍图像，该传感器从可见光到热红外光谱范围内获取102个通道的数据。采用光谱角映射（Spectral Angle Mapper， SAM）算法进行基于图像的监督分类。SAM通过在不同材料的屋顶上选择一组像素进行训练。该地图显示石棉水泥等级的平均生产者精度（PA）为86%，用户精度（UA）为89%。一种新的光谱指数，即“表面劣化指数”（ISD），是基于便携式光谱仪收集的石棉水泥屋顶的不同风化状态的测量数据而定义的。然后在MIVIS图像上计算ISD，允许区分两个风化等级（即高风化和低风化）。石棉水泥地图是在地理信息系统（GIS）中处理的，以便向市政当局提供具有石棉水泥屋顶的每个财产的地籍参考。该工具可用于市政当局，作为根据屋顶风化状况优先清除石棉的辅助工具。
The aims of this study were: (i) the mapping of asbestos cement roofs in an urban area; and (ii) the development of a spectral index related to the roof weathering status. Aerial images were collected through the Multispectral Infrared and Visible Imaging Spectrometer (MIVIS) sensor, which acquires data in 102 channels from the visible to the thermal infrared spectral range. An image based supervised classification was performed using the Spectral Angle Mapper (SAM) algorithm. The SAM was trained through a set of pixels selected on roofs of different materials. The map showed an average producer’s accuracy (PA) of 86% and a user’s accuracy (UA) of 89% for the asbestos cement class. A novel spectral index, the “Index of Surface Deterioration” (ISD), was defined based on measurements collected with a portable spectroradiometer on asbestos cement roofs that were characterized by different weathering statuses. The ISD was then calculated on the MIVIS images, allowing the distinction of two weathering classes (i.e., high and low). The asbestos cement map was handled in a Geographic Information System (GIS) in order to supply the municipalities with the cadastral references of each property having an asbestos cement roof. This tool can be purposed for municipalities as an aid to prioritize asbestos removal, based on roof weathering status.