Data repository for "UAV hyperspectral imaging for multi-scale assessment of Landsat 9 effective snow grain size and albedo", Frontiers in Remote Sensing, 2023.

Uploaded here the code and data repository for "UAV hyperspectral imaging for multi-scale assessment of Landsat 9 effective snow grain size and albedo" published in Frontiers of Remote Sensing (2022/2023). <br> Description of the data and scripts that are located in the repository. <br> field_spectrometer This folder contains two matlab data files. 1) "ASD spectra" contains 34 ASD field spectrometer reflectance measurements that are resampled to the Resonon NIR-HSI wavelengths. 2) "ASD_gps_coordinates" contains UTM coordinates for for the 34 ASD field spectrometer meassurments from (1). Example: ASD_spec(:,1) is located at ASD_coords(1,:). <br> landsat_retrievals This folder contains Landsat 9 grain size and albedo retrievals, and corresponding statistical runs as geotiffs. <br> nir_hsi_mosaics (1)This folder contains the mosaiced reflectance datacube pre- and post-vicarious calibration. (2) The grain size retrieval for the post-vicariously calibrated reflectance mosaic (3) The raw radiance mosaic (used for georeference in the spatial comparison script) <br> matlab_code albedo_landsat_visualization contains the proram that performs the spatial analysis between ASD, UAV-HSI, and Landsat. The UAV-HSI albedo calculation is also performed in this program. <br> <br> grain_size_retreival contains the grain size retrieval algroithms for ASD and NIR-HSI and the corresponding SNICAR lookup table for a 41deg zenith angle. <br> matlab functions folder should be in the path and are called in the codes provdied. <br> <br> THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.本仓库上传了发表于《遥感前沿》（Frontiers of Remote Sensing）2022/2023年的论文《无人机（Unmanned Aerial Vehicle, UAV）高光谱成像多尺度评估陆地卫星9号（Landsat 9）有效雪粒尺寸与反照率》的代码与数据集。<br>以下为仓库内数据与脚本的详细说明：<br>**field_spectrometer 文件夹**：包含两份Matlab数据文件。1) 「ASD_spectra」内含34组经重采样至Resonon近红外高光谱（NIR-HSI）波段的ASD野外光谱仪（ASD Field Spectrometer）反射率测量数据；2) 「ASD_gps_coordinates」收录了上述34组ASD野外光谱仪（ASD Field Spectrometer）测量对应的UTM坐标系坐标。示例：ASD_spec(:,1) 的空间位置对应 ASD_coords(1,:)。<br>**landsat_retrievals 文件夹**：包含陆地卫星9号（Landsat 9）的雪粒尺寸与反照率反演结果，以及对应统计运算生成的GeoTIFF格式文件。<br>**nir_hsi_mosaics 文件夹**：(1) 包含经过与未经过替代定标（vicarious calibration）的拼接反射率数据立方体；(2) 经替代定标（vicarious calibration）后的反射率拼接影像对应的雪粒尺寸反演结果；(3) 原始辐射亮度拼接影像（用于空间对比脚本中的地理配准）。<br>**matlab_code 文件夹**：<br>1. albedo_landsat_visualization 程序可实现ASD数据、无人机高光谱影像与陆地卫星9号（Landsat 9）数据间的空间分析，同时也可完成无人机高光谱反照率的计算；<br>2. grain_size_retrieval 内含针对ASD数据与近红外高光谱（NIR-HSI）影像的雪粒尺寸反演算法，以及对应41°天顶角的SNICAR查找表。<br>此外，Matlab函数文件夹需添加至系统搜索路径，以供所提供的脚本调用。<br><br>本软件按「原样」提供，不附带任何形式的明示或默示担保，包括但不限于适销性、特定用途适用性以及非侵权性的担保。