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Raster-that delineates wet landslide susceptibility for all parts of the map.
Oregon Department of Geology and Mineral Industries
Wet landslide susceptibility based on three material groups and six slope classes: none=0 and 1-9
Oregon Department of Geology and Mineral Industries
The following attributes are possible for records in the wet landslide susceptibility data: Value. Appropriate values are filled in for each.
Oregon Department of Geology and Mineral Industries
This raster GIS dataset depicts the wet landslide susceptibility for the Oregon Seismic Hazard Database.
The wet landslide susceptibility in this study is used to for landslide probability and severity with the best available data to produce the first version of a comprehensive statewide earthquake hazard database. Which we hope will give emergency mangers, planners, and others a clearer picture of the hazard in their community.
None
MAP DATA: This product is for informational purposes and may not have been prepared for or be suitable for legal, engineering, or surveying purposes. Users of this information should review or consult the primary data and information sources to ascertain the usability of the information. This publication cannot substitute for site-specific investigations by qualified practitioners. Site-specific data may give results that differ from the results shown in the publication.
When contacting DOGAMI about this data set, please reference the data set title or other identifying information in your correspondence. DOGAMI publications can be downloaded from http://www.oregongeology.org
Funding from Oregon Geospatial Enterprise Office, Framework Data Development Program
Care was taken to limit categorical attribute errors in the geologic group. Attribute accuracy is codependent on topographic slope angles and geologic group. Attribute accuracy of the dataset was visually inspected to identify potential anomalies, which were investigated to ensure they were consistent with the underlying data.
Dataset QA-QC was carried out, attributes fell within parameters.
The wet landslide susceptibility derived from HAZUS-MH methodology includes information for the state of Oregon and a small portion of input data from California. No attempt was made to test and compare different methods or data sources, which was beyond the scope of this project. One factor that may lead this map to underestimate susceptibility is that existing landslides are at high risk for reactivation during an earthquake, and the majority of landslides that exist in western Oregon are not represented in input datasets.
The geologic unit polygons have variable positional accuracies due to variable scales in compilations which in turn affects the positional accuracy of derivative rasters. However newest geologic maps were digitized on a lidar base at a 1:8000 scale. As a result the data set has a highly variable horizontal positional accuracy throughout the state of Oregon. Refer to the original source data for positional accuracy.
maximum accuracy defined by raster resolution
Data was derived from 4 source types. A geologic map compilation (OGDC-7), updated with recently prepared or published geologic maps, older seismic hazard studies using 3D data, recent geohazard studies that are published or in preparation, and landslide polygon data from SLIDO-4.2. For the OGDC and SLIDO 4.2 data, values were assigned based on a geologic unit, see report for further details. Other geohazard studies provided data that was directly useable. The various layers were stamped together in a specific order, described in the report. The resulting polygon data set was converted to a 30m raster following topology review. Final datasets where then converted to 98.4ft rasters due to the Oregon statewide projection standard unit being feet.
To make the slope class map, we made a hybrid digital elevation model of Oregon by resampling all of the available lidar topographic data to 30 m (98.4 ft) resolution, and then filling in the gaps with 30 m DEM data from the current USGS National Elevation Database (NED)
Not all data sources are listed in this lineage. Please see the 2021 Oregon Seismic Hazard Database: Purpose, Methods, And Uses report for a complete list.
When contacting DOGAMI about this data set, please reference the data set title or other identifying information in your correspondence. DOGAMI publications can be downloaded from http://www.oregongeology.org
The following attributes are possible for records in the wet landslide susceptibility data: Value. Appropriate values are filled in for each.
Oregon Department of Geology and Mineral Industries
When contacting DOGAMI about this data set, please reference the data set title or other identifying information in your correspondence. DOGAMI publications can be downloaded from http://www.oregongeology.org
Although these data have been processed successfully on a computer system at the Oregon Department of Geology and Mineral Industries, no warranty expressed or implied is made by DOGAMI regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty.
When contacting DOGAMI about this data set, please reference the data set title or other identifying information in your correspondence. DOGAMI publications can be downloaded from http://www.oregongeology.org