High Resolution Voyager 2 Images of Neptune's Moon, Triton

We processed 41 Voyager 2 images of Neptune?s moon Triton with pixel scales < 2 km/pixel form their raw, compressed, archived state to more usable cloud-optimized geotiffs, which can easily be used within spatial analysis software such as GIS. Processing was done using the USGS? ISIS software and included geometric and radiometric calibration, and the removal of image reseaux and corner markers (originally used for geometric calibration). The images were also photogrammetrically controlled relative to one another to improve their locations on the surface, which were initially inaccurate by up to 200 km. After performing a least squares bundle adjustment, the root mean square (RMS) uncertainty in image locations was 0.50, 0.52, and 0.51 pixels in latitude, longitude, and radius, respectively, with minimum and maximum residuals of -4.21 and +3.197 pixels, respectively. Each individual image was warped to an orthographic projection centered at 15 W and 18 N at the native image resolution. Because reseaux removal introduces interpolated data, two versions of each image are provided: a fully processed version with reseaux removed, and a partially processed version that retains the reseaux (i.e., no interpolation). We also generated a mosaic of Triton images that is spatially consistent with the entire dataset and provides context for the individual images (not every image is included in the mosaic). The mosaic uses the same orthographic projection as the individual images, but a consistent scale of 600 m/pixel. Three versions of the mosaic are included: a fully processed version (reseaux removed, some interpolated pixel values), a partially processed version (reseaux retained, no interpolation), and a fully processed but sharpened (high pass filter with 100% albedo add-back) to enhance surface features. This data release improves the usability and accessibility of this singular dataset and enables new scientific investigations of Triton.

本数据集对41张旅行者2号（Voyager 2）拍摄的海卫一（Triton）影像开展处理，原始影像像素分辨率小于2 km/像素，处理流程为将其从原始压缩归档状态转换为更便于使用的云优化地理TIFF（GeoTIFF）格式，可直接在地理信息系统（GIS）等空间分析软件中调用。处理工作依托美国地质调查局（USGS）的ISIS软件完成，涵盖几何与辐射定标、移除最初用于几何定标的图像格网与角标记。针对初始位置误差最高可达200 km的问题，本次处理对所有影像进行了跨影像的摄影测量控制，以优化其表面定位精度。经最小二乘光束法平差后，影像位置的均方根（RMS）不确定性在纬度、经度与半径方向分别为0.50、0.52与0.51像素，残差范围为-4.21至+3.197像素。每张独立影像均以15°W与18°N为中心，采用原始分辨率的正交投影进行畸变校正。由于移除格网操作会引入插值数据，因此为每张影像提供两个版本：一是移除格网的全处理版本，二是保留格网且未执行插值的部分处理版本。此外，本数据集还生成了一幅与全数据集空间匹配的海卫一影像镶嵌图，可为单张影像提供场景上下文（并非所有影像均纳入该镶嵌图）。该镶嵌图采用与单张影像一致的正交投影，但统一采用600 m/像素的比例尺。镶嵌图共包含三个版本：移除格网且存在插值像素值的全处理版本、保留格网且无插值的部分处理版本，以及经全处理后通过锐化（采用反照率100%叠加的高通滤波器）以增强表面特征的版本。本次数据发布提升了这一独特数据集的易用性与可访问性，可为海卫一的相关科学研究提供新的支撑。