Online Links:
| Value | Definition |
|---|---|
| Polygon | Shape of feature. |
| Range of values | |
|---|---|
| Minimum: | -0.26 |
| Maximum: | 0.55 |
| Value | Definition |
|---|---|
| 5 | Number of the Landsat satellite. |
| 7 | Number of the Landsat satellite. |
| 8 | Number of the Landsat satellite. |
Acknowledgment of the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Coastal and Marine Geology Program (SPCMSC), as a data source would be appreciated in products developed from these data, and such acknowledgment as is standard for citation and legal practices. Sharing of new data layers developed directly from these data would also be appreciated by the U.S. Geological Survey staff. Users should be aware that comparisons with other datasets for the same area from other time periods may be inaccurate due to inconsistencies resulting from changes in photointerpretation, mapping conventions, and digital processes over time. These data are not legal documents and are not to be used as such.
To document the Dauphin Island, Ala. shorelines, from March 25, 1984 to April 21, 2015 as observed from Landsat 5 Thematic Mapper (TM), Landsat 7 Enhanced Thematic Mapper Plus(ETM+), and Landsat Operational Land Imager (OLI) satellite imagery. These data will aid in developing an understanding of the change in barrier island size, shape and position, which can indicate erosion, land loss and island breakup. This dataset, dauphin_polys_combined_dates.zip, and others are included in a USGS Data-Release, which can be accessed online at https://doi.org/10.5066/F7028PMP.
Are there legal restrictions on access or use of the data?Access_Constraints: None.
Use_Constraints:None. However, variability in image quality from one date to another, from one image to another on the same date, and from one part of a single image to another part of the same image, exists due to many factors including variation in sun angle, atmospheric conditions, season, reflectivity of the earth surface, camera angle, camera lens, camera settings, film sensitivity, water turbidity, water depth, tide level, waves, and error in image rectification. No adjustments were made to account for tide level.
Although these data were processed successfully on a computer system at the USGS, 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 constitute any such warranty. The USGS shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
| Data format: | ArcGIS shapefile |
|---|---|
| Network links: |
https://coastal.er.usgs.gov/data-release/doi-F7028PMP/data/dauphin_polys_combined_dates.zip |
Publications are available from USGS Information Services, Box 25286, Federal Center, Denver, CO 80225-0046 (telephone: 1-888-ASK-USGS, e-mail: infoservices@usgs.gov).