This codebook.txt file was generated on 20170525 by Shanda Hunt, updated 20170915 by Melinda Kernik ------------------- GENERAL INFORMATION ------------------- 1. Title of Dataset Twin Cities Historical Surface Waters Based on Original Public Land Survey Maps 2. Author Information Lead Investigator Contact Information Name: Richard Strong, MUP, MDes Institution: University of Minnesota, College of Design, Center for Sustainable Building Research Address: 1425 University Avenue SE, Minneapolis, MN Email: stron081@umn.edu Associate or Co-investigator Contact Information Name: Ryan Mattke, MGIS Institution: University of Minnesota, University Libraries, John R. Borchert Map Library Address: 309 S 19th Ave S76, Minneapolis, MN Email: matt0089@umn.edu Associate or Co-investigator Contact Information Name: Len Kne, MGIS Institution: University of Minnesota, USpatial Address: 420 Blegen Hall, Minneapolis, MN Email: lenkne@umn.edu Associate or Co-investigator Contact Information Name: Coleman Shepard, BS in Geography Institution: University of Minnesota, Department of Geography Address: 414 Social Sciences Building, 19th Ave S, Minneapolis, MN Email: shepa135@umn.edu Associate or Co-investigator Contact Information Name: Melinda Kernik, MA in Geography Institution: University of Minnesota, University Libraries, John R. Borchert Map Library Address: 309 S 19th Ave S76, Minneapolis, MN Email: kerni016@umn.edu Associate or Co-investigator Contact Information Name: Richard Graves, PhD Institution: University of Minnesota, College of Design, Center for Sustainable Building Research Address: 1425 University Avenue SE, Minneapolis, MN Email: rmgraves@umn.edu 3. Date of data collection (single date, range, approximate date) The hydrologic features were recorded during the original public land survey from 1848 - 1858. Digitization of features was completed 20170522 - 20170525 4. Geographic location of data collection (where was data collected?): Minneapolis and St. Paul, MN 5. Information about funding sources that supported the collection of the data: No funding. -------------------------- SHARING/ACCESS INFORMATION -------------------------- 1. Licenses/restrictions placed on the data: CC BY-NC-SA Attribution-NonCommercial 4.0 International (CC BY-NC 4.0): https://creativecommons.org/licenses/by-nc/4.0/ Attribution-ShareAlike 4.0 International (CC BY-SA 4.0): https://creativecommons.org/licenses/by-sa/4.0/ 2. Links to publications that cite or use the data: None. 3. Links to other publicly accessible locations of the data: None at this time. 4. Links/relationships to ancillary data sets: None at this time. 5. Was data derived from another source? Original Public Land Survey Maps, 1848 - 1858 6. Recommended citation for the data: Graves, Richard; Strong, Richard; Mattke, Ryan; Kne, Len; Shepard, Coleman; Kernik, Melinda. (2017). Twin Cities Historical Surface Waters Based on Original Public Land Survey Maps. Retrieved from the Data Repository for the University of Minnesota, http://hdl.handle.net/11299/190187. 7. Disclaimer: There is no guarantee or representation to the user as to the accuracy, currency, suitabilty, or reliability of this data for any purpose. The user accepts the data “as is." --------------------- DATA & FILE OVERVIEW --------------------- 1. File List A. Filename: Original_Land_Survey_Wetlands.zip Short description: Shapefile of wetlands as marked on the original land survey B. Filename: Original_Land_Survey_Streams.zip Short description: Shapefile of streams as marked on the original land survey C. Filename: Original_Land_Survey_MississippiRiver.zip Short description: Shapefile of the Mississippi River as marked on the original land survey D. Filename: Original_Land_Survey_Lakes.zip Short description: Shapefile of lakes as marked on the original land survey E. Filename: Original_Land_Survey_Bottoms.zip Short description: Shapefile of river bottoms marked on the original land survey 2. Relationship between files: Related, but not dependent. -------------------------- METHODOLOGICAL INFORMATION -------------------------- 1. Description of methods used for collection and processing of data: Scanned maps from the original public land survey of the Twin Cities were downloaded from Minnesota IT Services Geospatial Information Office (http://www.mngeo.state.mn.us/chouse/GLO/ ). These georeferenced images of 1:24000 maps were provided in the NAD 1983 geographic coordinate system (EPSG:4269). Researchers and staff from the Unversity of Minnesota digitzed features related to streams, lakes, and wetlands in ArcMap using the "Create Features" tool in the editor toolbar. The digitized layers for each type of water feature were merged together, converted into shapefiles, and reprojected into the WGS 1984 Web Mercator Auxiliary Sphere projection (EPSG: 3857). 2. Instrument- or software-specific information needed to interpret the data: Any type of GIS software. 3. Describe any quality-assurance procedures performed on the data: Data scale is approximately 1:24000 4. People involved with sample collection, processing, analysis and/or submission: The first five authors. ----------------------------------------- DATA-SPECIFIC INFORMATION FOR SHAPEFILES ----------------------------------------- 1. Number of variables: 6 2. Number of cases/rows: Original_Land_Survey_Bottoms.zip - 8 polygons Original_Land_Survey_Lakes.shp.zip - 59 polygons Original_Land_Survey_MississippiRiver.zip - 1 polygon Original_Land_Survey_Streams.zip - 88 lines Original_Land_Survey_Wetlands.zip - 54 polygons 3. Missing data codes: Unknown = No name was provided for the hydrologic feature on the orginal land survey map 4. Variable List A. Name: OBJECTID Description: An ID field automatically generated by the editing tool B. Name: Date Description: An approximate date for the map from which the hydrologic feature was digitized C. Name: Name Description: The name of the hydrologic feature, if recorded on the map D. Name: MapName Description: The name for the map series E. Name: ModernName Description: The current name (as of 2017) for the hydrologic feature, if known F. Name: Shape_Leng Description: a field automatically generated for the object within the geodatabase (meters calculated based on EPSG:4269) G. Name: Shape_Area Description: a calculation of the polygon's area automatically generated for the object within the geodatabase (meters calculated based on EPSG:4269)