|Range of values|
|0||Shoreline month and day are known|
|1||Shoreline month and day are unknown and default value of 07/01 was used|
|Range of values|
|Alaska SDMI orthoimagery||State of Alaska Digital Mapping Initiative orthoimagery (http://www.alaskamapped.org/ortho/)|
|NOAA Nautical Chart||National Oceanographic and Atmospheric Administration Nautical Charts|
|NOAA T-Sheet||National Oceanographic and Atmospheric Administration Topographic Sheets|
|USGS - DOQQs||U.S. Geological Survey Digital Orthophoto Quarter Quandragle orthophotgraphy|
|USGS - lidar||U.S. Geological Survey northern Alaska coastal lidar elevation data|
|Range of values|
This dataset includes shorelines from ranging from 1947 to 2012 for the north coast of Alaska between the U.S.-Canadian Border and Icy Cape. Shorelines were compiled from T-sheets (National Oceanic and Atmospheric Administration), aerial orthophotographs (U.S. Geological Survey, ConocoPhillips and BP-Alaska), QuickBird satellite imagery (U.S. Fish and Wildlife Service), and lidar (U.S. Geological Survey). Historical shoreline positions serve as easily understood features that can be used to describe the movement of beaches through time. These data are used to calculate rates of shoreline change for the U.S. Geological Survey's (USGS) National Assessment Project. Rates of shoreline change were generated in a GIS using the Digital Shoreline Analysis System (DSAS) version 4.3. DSAS uses a measurement baseline method to calculate rate-of-change statistics. Transects are cast from the reference baseline to intersect each shoreline, establishing measurement points used to calculate shoreline change rates.
Are there legal restrictions on access or use of the data?
Use_Constraints:This information is not intended for navigational purposes. Read and fully comprehend the metadata prior to data use. Uses of these data should not violate the spatial resolution of the data. Where these data are used in combination with other data of different resolution, the resolution of the combined output will be limited by the lowest resolution of all the data. Acknowledge the U.S. Geological Survey in products derived from these data. Share data products developed using these data with the U.S. Geological Survey. This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Although this Federal Geographic Data Committee-compliant metadata file is intended to document these data in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.
This information is not intended for navigational purposes. This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
|Data format:||This WinZip file contains a shapefile of historic shorelines from 1947 to 2012 for the shorelines of the Alaska North Coast region from the U.S.-Canadian border to Icy Cape and associated metadata. in format vector digital data (version 9.0) Esri polyline shapefile Size: 0.418|
This zip file contains data available in Environmental Systems Research Institute (Esri) polyline shapefile format. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing the data. A free data viewer, ArcExplorer, capable of displaying the data is available from Esri at www.esri.com.