McKittrick Canyon Reef Trail strat section, Guadalupe Mtns Nat. Park, TX

Dataset includes SfM point cloud of northeastern edge of McKittrick Canyon in Guadalupe Mountains national park. Point cloud spans portions of the reef trail, extending from carbonate ramp/slope deposits, to overlying massive reef (large cliffs), and backreef deposits (flat layers with overhangs).

SfM photographs were collected with handheld 55mm zoom lens DSLR camera in May, 2018. Photograph locations were geotagged using an Arrow gold GPS unit to 3D accuracy of ~2 m.

Bare-earth airborne lidar dataset was used as reference cloud in iterative closest point alignment in CloudCompare V2.12: https://doi.org/10.5069/G9BK19G8. No vegetation filtering or clipping was performed on SfM derived point cloud.

M3C2 cloud-to-cloud difference between lidar point cloud and SfM point cloud with default parameters and SfM model as cloud 1 yields 1-sigma cloud-to-cloud difference of 0.96 m and 2-sigma cloud-to-cloud difference of 2.38 m. Lidar point cloud contains significant large holes in cliff overhang locations.

Accuracy is likely not sufficient for change detection analysis but is sufficient for morphometric analysis and stratigraphic mapping.

本数据集包含瓜达卢佩国家公园麦克基特里克峡谷东北边缘的同步测图(SfM)点云数据。点云覆盖了珊瑚礁小径的部分区域，从碳酸盐阶地/斜坡沉积物延伸至覆盖的巨大珊瑚礁（大型悬崖）以及背礁沉积物（带有悬垂的平坦层）。同步测图摄影于2018年5月使用手持55mm变焦镜头的DSLR相机采集。摄影地点使用Arrow gold GPS设备进行地理标记，达到约2米的3D精度。

裸地机载激光雷达数据集作为CloudCompare V2.12中的迭代最近点对齐的参考云：https://doi.org/10.5069/G9BK19G8。在由同步测图得到的点云上未进行植被过滤或裁剪。

使用默认参数和同步测图模型作为云1，M3C2激光雷达点云与同步测图点云之间的云间差异为1-σ云间差异0.96米，2-σ云间差异为2.38米。激光雷达点云在悬崖悬垂位置存在显著的大孔洞。

精度可能不足以进行变化检测分析，但对于形态计量分析和地层学制图是充分的。