SDE Feature Class
The digital maps presented here were originally published as hard copy maps in the Coastal Zone Atlas of Washington between 1978 and 1980. Although the Atlas has been out of print for many years, the maps contain information that remain the basis for local planning decisions. After receiving multiple requests for electronic versions of portions of the Atlas, an effort was made to scan, georeference and digitize aspects of the Atlas, beginning with the slope stability maps. These maps indicate the relative stability of coastal slopes as interpreted by geologists based on aerial photographs, geological mapping, topography, and field observations. Such methods are standard, but may occasionally result in some unstable areas being overlooked and in some stable areas being incorrectly identified as unstable. Further inaccuracies are introduced to the data through the process of converting the published maps into digital format. Important land use or building decisions should always be based on detailed geotechnical investigations. This mapping represents conditions observed in the early and mid-1970s. Shorelines and steep slopes are dynamic areas and many landslides have occurred since that time that are not reflected on these maps. Subsequent human activities may have increased or decreased the stability of some areas.
These maps are intended to educate the public about Washington's shoreline and to guide regional land use decisions. These maps should not be used as a substitute for site-specific studies carried out by qualified geologists and engineers. The Department of Ecology assumes no liability for the data depicted on these maps.
Mapping of slope stability in the Coastal Zone Atlas only extends 2000 feet inland from the shoreline. Mapping was carried out only in those areas under direct state shoreline jurisdiction and therefore did not include federal military installations or Indian Reservations. The Coastal Zone Atlas was printed on a base map consisting of United States Geological Survey (USGS) 1:2400 topographic quadrangles, some of which were quite old. This information was provided for reference, but should not be used to determine current conditions, as many structures, roads, and other features have changed considerably.
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Washington State Department of Ecology, Shorelands and Coastal Zone Management Program
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970s.
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
The source materials were the Slope Stability Maps from the Coastal Zone Atlas. These maps are depicted as a color overlay on the USGS 1:24,000 topographic quadrangle maps current in the mid- 1970's.
Slope stability maps included on image plates from the Washington State Coastal Zone Atlas were scanned, clipped and georeferenced to USGS 1:24,000 topographic quadrangle maps. Polygons indicating relative slope stability were then digitized from these georeferenced images. Separation or overlap of the plates is a result of error in the initial mapping and/or georeferencing and digitizing inaccuracies. Although the plates were digitized into one theme, seams between individual plates remain apparent. Transfer of printed material to digital format has resulted in coarser scale of resolution of the final product. A random sampling of data points (n=177) indicates a distance error between digitized polygon shoreline and the USGS 1:24,000 topographic quadrangle maps of 61.0±75.0.
Dataset copied.
Dataset copied.
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The Washington State Department of Ecology provides these geographic data "AS IS" WITHOUT A WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR USE, AND/OR NON-INFRINGEMENT.
Digital data order form is available at http://www.ecy.wa.gov/services/gis/data/digital.doc.
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