|Range of values|
|Resolution:||30 meters (1 pixel)|
|sand line||Inland extent of sand behind the open-ocean shoreline|
|sand island||Sand extents (“islands”) inland of or isolated from the continuous sand line, larger than eleven pixels (about 10,000 m2)|
|vegetation island||Vegetation extents (“islands”) seaward of the continuous sand line, larger than eleven pixels (about 10,000 m2)|
|sea shoreline||Ocean-facing sea shoreline|
|back-barrier shoreline||Estuarine-facing back-barrier shoreline|
|estuarine mainland||Estuarine-facing mainland shoreline|
|marsh island||Estuarine marsh islands larger than eleven pixels (about 10,000 m2)|
U.S. Geological Survey, Coastal and Marine Geology Program, St. Petersburg Coastal and Marine Science Center
This zip archive includes vector data representing shoreline positions and sand extents derived from 19 Landsat 5 Thematic Mapper (TM) and four Landsat 8 Operational Land Imager (OLI) image datasets from Assateague Island to Metompkin Island, Maryland and Virginia. For each image acquisition date, the Level 1 data products were stacked into composite 6-band (visible blue, green, and red; near infrared; and two short-wave infrared bands) image files and converted to at-sensor radiance and top-of-atmosphere reflectance. Adjacent scenes (Worldwide Reference System 2, path 14 row 33 and path 14 row 34) were mosaicked to a single image and then clipped to the study area extent. Seven land-cover classes (water, wet marsh, marsh, forested, mixed vegetation, vegetated bare earth, and bare earth) were derived for each image acquisition date using a hybrid classification approach to minimize misclassification of small interior water bodies and tidal channels with surrounding marsh environments. Vector line files representing the continuous inland extent of sand behind the open-ocean shoreline, the ocean-facing sea shoreline, the back-barrier island shoreline, the estuarine mainland shoreline, and back-barrier estuarine marsh islands were extracted from the thematic land-cover datasets.
Are there legal restrictions on access or use of the data?
Use_Constraints:The U.S. Geological Survey requests that it be acknowledged as the originator of this dataset in any future products or research derived from these data.
This publication was prepared by an agency of the United States Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. 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 zip file contains two file geodatabases, containing vector line datasets representing sand extents and sea, back-barrier, and estuarine mainland shoreline positions derived from Landsat 5 and Landsat 8 classified imagery, respectively, and this metadata. in format Esri file geodatabase (version 10.2.2) Vector dataset Size: 0.58|
These file geodatabase raster datasets were created using Esri ArcGIS version 10.2.2 and can be opened using Esri ArcGIS version 10.0 or higher; these data may also be viewed using the free GIS viewer ArcGIS Explorer.