Spatial distribution of depth-averaged velocity measured in the Des Plaines River, Illinois (October 21, 2015)

These data were collected using a 1200 kHz TRDI Rio Grande acoustic Doppler current profiler (ADCP) in mode 12 with 25 centimeter bins from a moving boat. The data were georeferenced with a Trimble AG132 differential Global Positioning System (GPS) receiver with submeter accuracy. The data have been depth-averaged over the entire measured portion of the water column, temporally averaged over 5-second intervals to reduce noise, and exported as a .csv file using the Velocity Mapping Toolbox (Parsons and others, 2013). These data were collected in support of the US Army Corps of Engineers Great Lakes and Mississippi River Interbasin Study (GLMRIS), and were concurrent with a dye-tracing study. NOTE: Any data assigned a value of "-9999" are invalid or missing data and should not be used for analysis. Parsons, D. R., Jackson, P. R., Czuba, J. A., Engel, F. L., Rhoads, B. L., Oberg, K. A., Best, J. L., Mueller, D. S., Johnson, K. K. and Riley, J. D. (2013), Velocity Mapping Toolbox (VMT): a processing and visualization suite for moving-vessel ADCP measurements. Earth Surf. Process. Landforms, 38: 1244–1260. doi: 10.1002/esp.3367

本数据集由搭载于移动船舶的1200 kHz TRDI Rio Grande型声学多普勒流速剖面仪（Acoustic Doppler Current Profiler，ADCP）以模式12采集，测层间距为25厘米。
数据通过Trimble AG132型差分全球定位系统（Global Positioning System，GPS）接收机完成地理配准，该设备具备亚米级定位精度。
数据集已对整个实测水层进行深度平均，并以5秒为间隔实施时间平均以降低噪声，最终通过流速制图工具箱（Velocity Mapping Toolbox，VMT）（Parsons等，2013）导出为.csv格式文件。
本数据集的采集服务于美国陆军工程兵团五大湖与密西西比河跨流域研究（Great Lakes and Mississippi River Interbasin Study，GLMRIS），且与同期开展的染料示踪研究同步进行。
注意：所有赋值为"-9999"的数据均为无效或缺失数据，不得用于分析。

Parsons, D. R.、Jackson, P. R.、Czuba, J. A.、Engel, F. L.、Rhoads, B. L.、Oberg, K. A.、Best, J. L.、Mueller, D. S.、Johnson, K. K. 与 Riley, J. D.（2013）：流速制图工具箱（Velocity Mapping Toolbox，VMT）：面向移动载体ADCP测量数据的处理与可视化套件，《地表过程与地形（Earth Surf. Process. Landforms）》，38卷：1244–1260。DOI: 10.1002/esp.3367