Multispectral and thermal surface imagery and surface elevation mosaics - Pendleton Feb 2023
收藏DataCite Commons2024-04-06 更新2024-07-13 收录
下载链接：
https://www.osti.gov/servlets/purl/1969041/
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资源简介：
This data set contains high-resolution image products (orthomosaics) acquired from midsized uncrewed aerial systems that have been processed for value-added quality. The instrument Altum multispectral imager by Micasense, captures in six bands (blue - 475nm, green - 560nm, red - 668nm, red edge - 717nm, near-infrared - 840 and LWIR/thermal - 11000nm. The optical bands are converted to reflectance via custom code using the instantaneous band horizontal irradiance ratio to the radiance of the pixel. The code used to develop these images first uses tools from the Micasense Python library to apply dark level corrections, row gradient corrections, and radiometric corrections. Next, it uses the processing API from Agisoft Metashape software to align and mosaic the processed imagery, following the processes developed by the USGS' structure from motion workflow documentation. Captures from different altitudes are used to produce an orthomosaic at each height. A tif image containing information related to the six spectral bands, and a digital elevation model (DEM), a tif image containing information related to the elevation of the surveyed terrain. 1 https://www.arm.gov/publications/tech_reports/handbooks/doe-sc-arm-tr-281.pdf 2 https://micasense.github.io/imageprocessing/MicaSense%20Image%20Processing%20Setup.html 3 https://pubs.usgs.gov/of/2021/1039/ofr20211039.pdf
本数据集包含经增值质量处理的、由中型无人航空系统获取的高分辨率影像产品——正射影像镶嵌图（orthomosaics）。所用成像设备为Micasense公司的Altum多光谱成像仪（Altum multispectral imager），可采集6个波段的影像：蓝光波段（475nm）、绿光波段（560nm）、红光波段（668nm）、红边波段（717nm）、近红外波段（840nm）以及长波红外/热红外波段（11000nm）。
光学波段数据将通过自定义代码转换为反射率，转换过程采用瞬时波段水平辐照度与像素辐射亮度的比值作为计算依据。
用于生成此类影像的代码首先调用Micasense Python库的工具，完成暗电平校正、行梯度校正与辐射定标校正；随后调用Agisoft Metashape软件的处理API，对经过校正的影像进行对齐与拼接，流程遵循美国地质调查局（USGS）制定的运动恢复结构（structure from motion）工作流文档规范。
本项目采用不同飞行高度获取的影像，可针对每一飞行高度生成对应的正射影像镶嵌图。
本数据集包含两类TIFF格式影像：其一为包含6个光谱波段信息的TIFF文件；其二为数字高程模型（digital elevation model, DEM），即承载所勘测地形高程信息的TIFF文件。
1 https://www.arm.gov/publications/tech_reports/handbooks/doe-sc-arm-tr-281.pdf
2 https://micasense.github.io/imageprocessing/MicaSense%20Image%20Processing%20Setup.html
3 https://pubs.usgs.gov/of/2021/1039/ofr20211039.pdf
提供机构：
Atmospheric Radiation Measurement (ARM) Archive, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (US); ARM Data Center, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
创建时间：
2023-04-20
