Baseline: The Baseline line file gives the location of the alongshore baseline used to cast transects. Rates: Shoreline change is measured at regular intervals along the coast at transects that are cast orthogonal to shorelines from a baseline. Each method used to calculate shoreline change rates is based on measured differences between shoreline positions through time. The reported rates are expressed as meters of change along transects per year. When the user-selected rate-change calculations are processed, DSAS merges the individual module calculations, and the output is made available as a table in ArcMap. The rate-change statistics provided with DSAS have the standardized field headings. Some of the shoreline statistic values listed below require greater than 3 shoreline positions to calculate the statistic. If the shoreline statistic is a null value, there were not enough shorelines analyzed to compute that statistic. Shorelines: Shoreline positions are a representation of a linear shoreline feature at a given point in time. These data were visually interpreted from historical and current orthorectified aerial photographs and delineated using ArcGIS.
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This work was funded by FEMA, the State of Alaska, the Denali Commission, and the U.S. Bureau of Indian Affairs. Data were produced by the Alaska Division of Geological & Geophysical Surveys, the U.S. Geological Survey, and the UAF Arctic Coastal Geoscience Lab.
Many of Alaska's coastal communities are vulnerable to erosion, flooding, and permafrost degradation. However, there are few vulnerability assessment tools available to the public that are complete or that utilize transparent, consistent, and quantitative methods at a scale needed for local planning. This work is an effort to provide numerical shoreline change data to Alaskans for local decision-making and erosion vulnerability assessments.
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Are there legal restrictions on access or use of the data?Access_Constraints:
This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).Use_Constraints:Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity, whether from the use of the electronic services or products, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requestor or anyone else exceed the fee paid for the electronic service or product.
| Data format: | vector data in format report and geodatabase |
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http://dx.doi.org/10.14509/30552 |