Uncrewed Aircraft Systems (UAS) Multispectral Orthomosaic - Cockatoo Hills, Tasmania

This dataset contains UAV multispectral imagery collected as part of a field trial to test the Uncrewed Aerial System to be used for the TERN Drone project. The UAS platform is DJI Matrice 300 RTK with 2 sensors: Zenmuse P1 (35 mm) RGB mapping camera and Micasense RedEdge-MX Dual (10-band multispectral sensor). P1 imagery were geo-referenced using the onboard GNSS in M300 and the D-RTK 2 Mobile Station. P1 Camera positions were post-processed using AUSPOS. Flight conducted between 10:26 am and 10:47 am AEDT at flying height 80 m, forward and side overlaps for Zenmuse P1 set to 80%. MicaSense RedEdge-MX Dual triggered using timer mode (every second).

Micasense multispectral sensor positions were interpolated using P1, following which a standard workflow was followed in Agisoft Metashape to generate this orthomosaic (resolution 5 cm). Reflectance calibration was performed using captures of the MicaSense Calibration Panel taken before the flight. The orthomosaic raster has the relative reflectance (no unit) for the 10 bands (Coastal Blue, Blue, Green 531, Green, Red 650, Red, RedEdge 705, RedEdge, RedEdge 740, NIR). The cloud optimised (COG) GeoTIFF was created using rio command line interface. The coordinate reference system of the COG is EPSG 7855 - GDA2020 MGA Zone 55.

In the raw data RedEdge-MX image file suffixes correspond to bands like so - 1: Blue, 2: Green, 3: Red, 4: NIR, 5: Red Edge, 6: Coastal Blue, 7: Green 531, 8: Red 650, 9: RedEdge 705, 10: RedEdge 740. However, in the processed Orthomoasic GeoTIFF, the bands 1-10 are ordered as per the Central Wavelength (Coastal Blue, Blue, Green 531, Green, Red 650, Red, RedEdge 705, RedEdge, RedEdge 740, NIR).

本数据集包含为TERN无人机项目开展的野外试验所采集的无人机（Unmanned Aerial Vehicle, UAV）多光谱影像，该试验旨在测试项目所用的无人航空系统（Uncrewed Aerial System, UAS）。本次试验的UAS平台为DJI Matrice 300 RTK，搭载两款传感器：禅思（Zenmuse）P1（35 mm）RGB测绘相机，以及Micasense RedEdge-MX Dual十波段多光谱传感器。禅思P1的影像通过搭载于M300 RTK的机载全球导航卫星系统（GNSS）与D-RTK 2移动基站完成地理配准，相机拍摄位置经AUSPOS进行后处理。飞行作业于澳大利亚东部夏令时（AEDT）10:26至10:47间开展，飞行高度为80米；禅思P1相机的航向重叠度与旁向重叠度均设置为80%。Micasense RedEdge-MX Dual传感器采用定时模式（每秒一次）触发拍摄。

Micasense多光谱传感器的拍摄位置通过禅思P1的影像进行插值补全，随后采用Agisoft Metashape标准流程生成分辨率为5厘米的正射影像图。反射率校正通过飞行前采集的Micasense校准板影像完成。该正射影像栅格包含10个波段的相对反射率（无单位），波段依次为海岸蓝（Coastal Blue）、蓝（Blue）、531nm绿（Green 531）、绿（Green）、650nm红（Red 650）、红（Red）、705nm红边（RedEdge 705）、红边（RedEdge）、740nm红边（RedEdge 740）以及近红外（NIR）。本数据集采用rio命令行界面生成了云优化（Cloud Optimised GeoTIFF, COG）格式的GeoTIFF文件。该云优化GeoTIFF的坐标参考系统为EPSG 7855——GDA2020 MGA第55带。

原始数据中，RedEdge-MX影像的文件序号与波段对应关系如下：1对应蓝（Blue）、2对应绿（Green）、3对应红（Red）、4对应近红外（NIR）、5对应红边（Red Edge）、6对应海岸蓝（Coastal Blue）、7对应531nm绿（Green 531）、8对应650nm红（Red 650）、9对应705nm红边（RedEdge 705）、10对应740nm红边（RedEdge 740）。但在处理完成的正射影像GeoTIFF中，1至10波段的排序依据中心波长依次为：海岸蓝（Coastal Blue）、蓝（Blue）、531nm绿（Green 531）、绿（Green）、650nm红（Red 650）、红（Red）、705nm红边（RedEdge 705）、红边（RedEdge）、740nm红边（RedEdge 740）以及近红外（NIR）。