Topographic Survey Data from Photogrammetry of Fountain Creek between Colorado Springs and the Confluence of Fountain Creek at the Arkansas River, Colorado, 2017

In 2012, the U.S. Geological Survey (USGS) Colorado Water Science Center in cooperation with Colorado Springs Utilities selected 10 reaches or study area along Fountain Creek between Colorado Springs and the confluence of Fountain Creek at the Arkansas River for annual bed and bank characterization and topographic surveys. The 10 selected study areas are approximately 5 to 20 bank-full channel widths in length. The topographic surveys collected point data of location and elevation in the active channel and along both left and right banks and flood plains. Historically, the topographic data have been collected exclusively using real-time kinematic Global Navigation Satellite Systems. However, on January 12, 2017, at Study Area 3, the topographic survey data were collected with a 3DR Solo Unmanned Aircraft System using structure from motion photogrammetry. These point data will be compared to real-time kinematic Global Navigation Satellite Systems which also was collected at Study Area 3 in 2017. The new topographic survey data will allow UGSG to evaluate the utility and functionality of using drone collected data in support of the an annual assessment of the geomorphic change at each study area. These data have been georeferenced but have not had any additional processing to remove vegetation or other obstructions. Work is underway to generate a bare-earth model that has all vegetation and other erroneous points removed.

2012年，美国地质调查局（U.S. Geological Survey, USGS）科罗拉多州水资源科学中心与科罗拉多斯普林斯公用事业公司合作，在科罗拉多斯普林斯至方廷溪汇入阿肯色河的河段之间，沿方廷溪选定了10个研究河段或区域，用于开展年度河床与岸坡特征调查及地形测量。所选的10个研究区域长度约为满岸河槽宽度的5至20倍。本次地形测量采集了活动河道、左右岸及漫滩的位置与高程点数据。历史上，此类地形数据均仅通过实时动态全球导航卫星系统（real-time kinematic Global Navigation Satellite Systems）采集。但在2017年1月12日，针对3号研究区域，科研团队采用3DR Solo无人机系统（Unmanned Aircraft System, UAS）结合运动恢复结构摄影测量法（structure from motion photogrammetry）采集了地形测量数据。该点位数据将与2017年同期在3号研究区域采集的实时动态全球导航卫星系统数据进行比对。这批新的地形测量数据将助力美国地质调查局评估无人机采集数据的实用性与功能性，以支撑各研究区域地貌变化的年度评估工作。这些数据已完成地理配准，但尚未进行任何额外处理以移除植被或其他遮挡物。目前正开展相关工作以生成裸土模型，该模型将移除所有植被及其他异常点位。