Scarp_Flanks

Oregon Department of Geology and Mineral Industries 2026 Scarp_Flanks vector digital data Oregon Department of Geology and Mineral Industries Open-File Report O-26-01 Portland, Oregon, USA Oregon Department of Geology and Mineral Industries https://www.oregon.gov/dogami/pages/default.aspx Oregon Department of Geology and Mineral Industries 2026 Landslide Inventory and Risk Reduction, Coos and Douglas Counties, Oregon "1.0" Oregon Department of Geology and Mineral Industries Open-File Report O-26-01 Portland, Oregon, USA Oregon Department of Geology and Mineral Industries https://www.oregon.gov/dogami/pages/default.aspx The landslide inventory is intended to provide users with basic information regarding landslides. This feature class represents polygons that delineate the head scarps and scarp flanks. These head scarps or uppermost scarps in many cases expose the primary failure plane (surface of rupture) and flanks or shear zones. The landslide inventory is intended to provide users with basic information regarding landslides. The geologic, terrain, and climatic conditions that led to landslides in the past may provide clues to the locations and conditions of future landslides, and it is intended that this data will provide useful information to develop regional landslide susceptibility maps, to guide site-specific investigations for future developments, and to assist in regional planning and mitigation of existing landslides. 2026-04-07 00:00:00 Complete As needed -123.921332 -123.733743 43.104382 42.972939 ISO 19115 Topic Category geoscientificinformation Oregon Geospatial Enterprise Office Metadata Keyword Thesaurus landslide scarp flank geologic hazard Oregon Geospatial Enterprise Office Metadata Keyword Thesaurus soil surface alluvium sediment Oregon Geospatial Enterprise Office Metadata Keyword Thesaurus United States North America Oregon Douglas Coos 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. Oregon Department of Geology and Mineral Industries mailing and physical address

800 NE Oregon Street Suite 965

Portland Oregon 97232 USA 1 971 673 1555 1 971 673 1562 dogami-info@dogami.oregon.gov 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 https://www.oregon.gov/dogami/pages/default.aspx William J. Burns Oregon Department of Geology and Mineral Industries The project described in this publication was funded by the Bureau of Land Management (BLM). Unclassified All field values were checked for consistency with the domains listed in the Protocol for Inventory Mapping of Landslide Deposits from Light Detection and Ranging (lidar) Imagery. This check was a general attribute check. Because an individual scarp flank feature must share a UNIQUE_ID value with an individual deposit feature, when necessary, the UNIQUE_ID field is visually checked to have a matching unique ID in the Landslide Deposits feature class. This is a check for consistency between feature classes. All scarp flanks were checked for duplicates and an association with a landslide deposit. The Scarp Flanks feature class is a complete compilation of all landslide scarp flank polygons within the county study area. The study area includes about 43 square miles in Coos and Douglas Counties. Landslides that are smaller than 100 square meters (1,075 square feet) may not be identified due to the resolution of the lidar data and air photos used in this project area. Only deposits created using DOGAMI Special Paper 42, lidar-based methods will have their head scarps mapped. The line work was captured by heads up digitizing at several different scales; 1:24,000 (the native scale of standard printed 7.5-minute topographic quadrangles), 1:10,000, and 1:4,000. All lines were relocated at a scale of 1:4,000 to ensure that all spatial data (lines) have been mapped consistently. Line work is published at a maximum scale of 1:8000 which is also the recommended use scale. Base map used for digitization was DOGAMI bare earth lidar. Lidar data quality requires that the average departure from planarity within any 10 meters by 10 meters area shall be no greater than 5 cm. However the accuracy may still vary. Lidar-derived bare earth elevation model vertical accuracy is typically less than 1 foot. Oregon Department of Geology and Mineral Industries 2009 Protocol for Inventory Mapping of Landslide Deposits from Light Detection and Ranging (Lidar) Imagery Not Applicable Oregon Department of Geology and Mineral Industries Special Paper SP-42 Portland, Oregon, USA Oregon Department of Geology and Mineral Industries https://pubs.oregon.gov/dogami/sp/p-SP-42.htm 2009 Burns and Madin, 2009 This data was prepared using a wide variety of interpretation methods, including aerial photos, field work, map digitizing, and methods following the Protocol for Inventory Mapping of Landslide Deposits from Light Detection and Ranging (Lidar) Imagery developed by Burns and Madin (DOGAMI Special Paper 42, 2009). In the Special Paper 42, the three primary tasks include compilation of previously mapped landslides, lidar-based morphologic mapping of landslide features, and review of aerial photographs. Landslides identified by these methods are digitally compiled into this database at varying scales. While the protocol recommends data use at a map scale of 1:8,000, and the geodatabase contains data at 1:8,000 or better, for representation purposes the data have been visualized on the map plate at 1:32,000. Each landslide is also attributed with classifications for activity, depth of failure, movement type, and confidence of interpretation. Burns and Madin, 2009 Oregon Department of Geology and Mineral Industries mailing and physical address

800 NE Oregon Street Suite 965