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Open-File Report O-21-10, Landslide Inventory Map for the Coastal Portion of Clatsop County, Oregon

by William J. Burns, Ian P. Madin, and Nancy C. Calhoun, 1 map plate, one EsriŽ geodatabase with internal metadata, external metadata in .xml format.

What's in this report?
This map is an inventory of landslides in the coastal portion of Clatsop County.  

Report downloads:

EXECUTIVE SUMMARY

This map is an inventory of existing landslides in the study area. The landslide inventory is one of the essential data layers used to delineate regional landslide susceptibility. This landslide inventory is not regulatory, and revisions can happen when new information regarding landslides is found or when new landslides occur. Therefore, it is possible that landslides within the mapped area were not identified or occurred after the map was prepared.

This inventory map was prepared by following the Protocol for Inventory Mapping of Landslide Deposits from Light Detection and Ranging (lidar) Imagery developed by Burns and Madin (2009). The three primary tasks included compilation of previously mapped landslides (including review of the Statewide Landslide Information Database for Oregon [SLIDO] Release 4 [Franczyk and others, 2019]), lidar-based morphologic mapping of landslide features, and review of aerial photographs. Landslides identified by these methods were digitally compiled into a GIS 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 was also attributed with classifications for activity, depth of failure, movement type, and confidence of interpretation. The landslide data are displayed on top of a base map that consists of an aerial photograph (orthorectified) overlaid on the lidar-derived hillshade image.

This landslide inventory map is intended to provide users with basic information regarding landslides within the study area. The geologic, terrain, and climatic conditions that led to landslides in the past may provide clues to the locations and conditions of future landslides. It is intended that this map 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.

GEOGRAPHIC INFORMATION SYSTEM (GIS) DATA
Geodatabase is EsriŽ version 10.2 format.
Metadata is embedded in the geodatabase and is also provided as separate .xml formatted files.

Each dataset listed below has an associated, standalone .xml file containing metadata in the Federal Geographic Data Committee Content Standard for Digital Geospatial Metadata format.

Clatsop_Landslide_Inventory.gdb:

Deposits

polygons

.xml

Scarp_Flanks

polygons

.xml

Scarps

lines

.xml

Study Area

polygon

.xml


 
Diagram

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MAP PLATE (PDF)

Plate 1, Landslide Inventory Map of the Coastal Portion of Clatsop County, Oregon (6 MB PDF)

Map

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