National Park Service St. Croix National Scenic Riverway - Osceola Contours - Depth, 20191016

The U.S. Geological Survey (USGS) collected hydroacoustic data of the St. Croix River adjacent to the Osceola (WI) boat ramp for hydrographic and benthic mapping...美国地质调查局（U.S. Geological Survey, USGS）为开展水文测绘与底栖制图工作，采集了毗邻威斯康星州（WI）奥西奥拉船艇坡道的圣克罗伊河的水声数据……