欧亚国际

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.