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USGS Topgraphic Maps (1950s, 1960s, 1970s, 1980s) & NOAA Environment Sensitivity Index (ESI) data (1990). Only data from the late 1800s, 1990, and the late 2000s provides complete coverage for the entire coast over a reasonably set period of time. All other data sources address sections of the coast, but not the entire state. As such, there are varying amounts of time-series data at any location along the coast. All data has been combined to utilize a uniform system of attributes - since the NOAA T-Sheet data was the most voluminous source of information their schema was used as the default; other data sources transferred similar data into the NOAA schema. There were various ways different source materiall defined and classified the shoreline; this descriptive information was retained in the field called \"ATTRIBUTE\" and to a lesser extent \"INFORM.\" The \"SOURCE_ID\" field is used to track the varying source data types. Several temporally related fields exist: \"SRCE_DATE\" in YYYYMMDD format is the best representation of the source material date and is suitable for sorting chronologically; \"DSAS_DATE\" uses a format predifined for the DSAS software package and replicates the information from \"SRC_DATE.\" The field \"DECADE\" allows for aggregation/sorting by decade. The field \"UNCERT_M\" is required by the DSAS software and represents a cummulative positional uncertainty estimate (in meters) for eaxh shoreline segment. The value combines best estimates for common sources of error - source survey/compilation, map georeferencing, map digitizing, and water level interpretation/location. The estimates are derived from serveral published papers from USGS when conducting similar studines witnin the northeast, and the total value represents the square root of the sum of squares. The field \"CONCERN\" identifies sections of shoreline that, under professional review, are deemd to be incorrectly located or eroneously depict shoreline. The review process entailed creating buffers based on the uncertainty values and comparing shorelines to assorted aerial photography. While the photo vintages and the shorelines were not complimentary in all cases, there are enough areas of immobility (e.g., rocky shorelines, exposed bedrock, certain manmade structures, etc.) that persist in stable enough positions to enable a general determination of goodness of fit. Shorelines that matched these features within the appropriate uncertainty buffers were identified as \"N\" for no concern: shorelines that exceeded the uncertainty bounds due to spatial misalignment issues (e.g., out of reference) or were likely misinterpreting the best location of shoreline (i.e., tidal flats instead of a higher water line) were identified as \"Y.\" In cases were uncertainty bounds were exceeded, but there was no conclusive way to determine the reason, or if they were in an areas of high shoreline variability, they were assumed to be correct and coded as \"N.\" Rather than being removed, they were coded as such to either (a) easily be omitted from any analysis, or (b) subject to a reassessment of uncertainty in order to be more appropriately used. The data is preconfiguered to be compatible with the USGS Digital Shoreline Analysis System (DSAS) and is suitable for both cartographic displays and more rigorus shoreline change analysis studies.", "geometryType": "esriGeometryPolyline", "sourceSpatialReference": { "wkid": 102656, "latestWkid": 2234 }, "copyrightText": "NOAA, \nUSGS, \nCT DEEP\n\nNational Assessment of Shoreline Change: Historical Shoreline Change along the New England and Mid-Atlantic Coasts, by Cheryl J. Hapke, Emily A. Himmelstoss, Meredith G. Kratzmann, Jeffrey H. List, and E. Robert Thieler, Open-File Report 2010-1118.\n\nNational Assessment of Shoreline Change Part 3: Historical Shoreline Change and Associated Coastal Land Loss Along Sandy Shorelines of the California Coast, by Cheryl J. Hapke, David Reid, Bruce M. Richmond, Peter Ruggiero and Jeff List, Open-File Report 2006-1219.\n\nThe Predictive Accuracy of Shoreline Change Rate Methods and Alongshore Beach Variation on Maui, Hawaii\nAyesha S. Genz\u2020, Charles H. Fletcher\u2020, Robert A. Dunn\u2020, L. Neil Frazer\u2020, and John J. Rooney\u2021\nJournal of Coastal Research 23 1 87\u2013105 West Palm Beach, Florida January 2007\n\u2020Department of Geology and Geophysics\nSchool of Ocean and Earth Science and Technology\nUniversity of Hawaii\n\u2021Joint Institute of Marine and Atmospheric Research\nUniversity of Hawaii Pacific Islands Fisheries Science Center\n\n\nImproving Accuracy and Statistical Reliability of Shoreline Position and Change Rate Estimates\nJournal of Coastal Research 25 5 1069\u20131081 West Palm Beach, Florida September 2009\nPeter Ruggiero\u2020 and Jeffrey H. 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