Twin Cities Historical Surface Waters Based on Original Public Land Survey Maps, 1848 - 1858

These shapefiles of lakes, streams, wetlands, river bottoms, and the Mississippi River represent the hydrological landscape of Minneapolis and St. Paul as recorded in the original public land survey conducted between 1848 and 1858. The features were digitized from scanned, georeferenced 1:24000 maps during the 2017 Faculty Research Sprint held at the University of Minnesota. Many streams and other hydrologic features that were present in the Twin Cities at the time of the original land survey were channelized, covered, or filled during the late 1800's. These features, however, still function as water conduits within the hydrology systems of urban water and have immense importance to the water regime in the Twin Cities. This data was generated as part of a larger "Lost Waters" research project - aiming to create a visible, physical representation of these waters in the current urban landscape.

这批涵盖湖泊、溪流、湿地、河底及密西西比河的形状文件（shapefile），还原了1848年至1858年原始公共土地测绘所记录的明尼阿波利斯与圣保罗地区的水文景观。上述水文要素由明尼苏达大学2017年教师研究快速攻关项目（Faculty Research Sprint）期间，从扫描完成的地理配准1:24000比例尺地图中数字化提取所得。在原始土地测绘阶段，双子城境内存在的诸多溪流与其他水文要素，均在19世纪后期遭到渠化、覆盖或填埋。但此类要素至今仍在城市水文系统中承担输水通道的功能，对双子城的水文情势具有至关重要的意义。本数据集为大型研究项目"遗失水域（Lost Waters）"的成果之一，该项目旨在当前城市景观中呈现这些已消失水域的可视化实体形态。