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法国Hiphen较新六通道高光谱相机
发表时间: 点击:2951
来源:博普特
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Hiphen较新生产的六波段AIRPHEN高光谱相机有双幅特征:不牺牲空间分辨率的情况下增加幅度。
双幅原理:
5个相机(对应5个波段:蓝,绿,红,红边,近红外),焦距8mm((33° x 25°) ,可提供高分辨率以及小失真图像。1个相机,焦距4.2mm (60°x 46°) ,提供双幅。此相机对应绿波波段。所设计飞行规划用来提供双幅相机(4.2mm焦距)的70-80%重叠,这对应5X8mm相机的 40-50% 的重叠。摄影测量软件(如Agisoft Photoscan)组合了4.2mm和8mm相机特点,进行图像对齐。其提供了沿着3D密度云多光谱影像。
双幅优点:
给定地面分辨率下,通过双幅中的一个增加追踪距离,也容许相同机动情况下覆盖接近翻倍;覆盖相同区域面积时间减半。
因空间分辨率和较大角度取样,以精度和全面性而言,3D点云显著增强。
Double swath AIRPHEN Multispectral camera
HIPHEN equipped its 6 bands AIRPHEN multispectral camera with a double swath feature: it increases the swath without compromising on the spatial resolution.
Principles of the double swath
➢5 cameras (corresponding to 5 bands: blue, green, red, red-edge, near- infrared) are equipped with 8 mm focal length (33° x 25°) providing high resolution, small distortion images.
➢1 camera is equipped with 4.2mm focal length (60° x 46°) providing the double swath. This camera corresponds to a green band
➢The flight plan is designed to provide an overlap of 70-80% for the double swath camera (4.2mm focal length). This corresponds to 40-50% overlap for the five 8mm cameras.
➢The photogrammetry software (such as Agisoft Photoscan) combines the 4.2 mm with the 8mm cameras for image alignment. It provides the multispectral orthoimage along with the 3D dense cloud.