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首页> 外文会议>Targets and Backgrounds XII: Characterization and Representation >ACQUISITION AND ANALYSIS OF A SPECTRAL AND BIDIRECTIONAL DATABASE OF URBAN MATERIALS OVER TOULOUSE (FRANCE)
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ACQUISITION AND ANALYSIS OF A SPECTRAL AND BIDIRECTIONAL DATABASE OF URBAN MATERIALS OVER TOULOUSE (FRANCE)

机译：图卢兹（法国）城市材料光谱和双向数据库的获取和分析

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This paper presents an experiment carried out in Toulouse in 2004. This campaign aims to create a specific library which will give us simultaneously information in three domains: a list of the main materials present in the city, the optical properties of each of them (spectral and directional) and their spatial variability in a given class. The spectral domain covers the entire optical domain from the visible to the Long Wave InfraRed range. Measurements have been carried out in the visible and near infrared spectral region (400-2500 nm) with an ASD spectroradiometer at a 20 cm resolution for outdoors measurements, and with a goniometer for laboratory ones at the same spatial resolution. A database of about 550 individual spectra has been created. These spectra could be divided into 4 classical urban classes like road (red asphalt, tar), pavement (red asphalt, tar), square (granite slab) and wall (brick, concrete). In addition to these "in situ" experiments, the bi-directional behaviours of urban material samples have been studied in laboratory with the Onera goniometer. Two material types have been distinguished: flat materials, which is isotropic, and textured materials, whose study is more complex. Whereas road and sidewalk materials are quite lambertian with a slight backscattering effect typical of rough surfaces, square materials like granite or concrete present a specular peak at large zenith angle. A specific study on tiles demonstrates their important anisotropic directional properties. In the infrared domain (3μm - 14μm), a SOC 400 spectroradiometer was used at a 1.27cm spatial resolution. A database of about 100 individual spectra has been created. These spectra could be divided into four classical urban classes like road (red asphalt, tar), pavement (red asphalt, tar), square (granite slab) and wall (bricks, painted walls). In each spectral domain, three variability types are considered: a physical variability which is intrinsic to the material, a contextual variability depending on the material use and a theoretical variability which is the one observed inside a chosen class.
机译：本文介绍了2004年在图卢兹进行的一项实验。这项运动旨在创建一个特定的图书馆，该图书馆将同时为我们提供三个领域的信息：城市中主要材料的清单，每种材料的光学特性（光谱和定向）及其在给定类别中的空间变异性。光谱域覆盖了从可见光到长波红外范围的整个光学域。在可见光和近红外光谱区域（400-2500 nm）中，使用ASD分光光度计以20厘米的分辨率进行户外测量，对于实验室用测角计以相同的空间分辨率进行测量。已经创建了大约550个独立光谱的数据库。这些光谱可分为4个经典的城市类别，例如道路（红沥青，柏油），人行道（红沥青，柏油），广场（花岗岩板）和墙（砖，混凝土）。除了这些“原位”实验以外，还使用Onera测角仪在实验室中研究了城市材料样本的双向行为。区分了两种材料类型：各向同性的扁平材料和研究更为复杂的纹理材料。道路和人行道的材料是朗伯型的，具有粗糙表面典型的轻微反向散射效果，而方形材料（如花岗岩或混凝土）则在较大的天顶角处出现镜面反射峰。对瓷砖的一项特定研究证明了其重要的各向异性方向特性。在红外范围（3μm-14μm）中，使用了SOC 400分光辐射计，空间分辨率为1.27cm。已经创建了大约100个独立光谱的数据库。这些光谱可以分为四个经典的城市类别，例如道路（红沥青，柏油），人行道（红沥青，柏油），正方形（花岗岩板）和墙（砖，粉刷墙壁）。在每个光谱域中，考虑了三种可变性类型：材料固有的物理可变性，取决于材料用途的上下文可变性和在选定类别内观察到的理论可变性。

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