Metadata for Big River Watershed Geologic and Geomorphic Data

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1 Metadata for Big River Watershed Geologic and Geomorphic Data Metadata are descriptions and information regarding compiled data. This appendix contains the metadata that describes the compiled data used for the creation of the Big River Watershed geologic and geomorphic maps produced by the California Geological Survey (CGS). Included herein are data defining data currentness (recentness), data constraints, data accuracy, spacial reference data, contact information data, and methodology data. This metadata has been copied from an electronic metadata text file (.txt) that is part of the geographic information system (GIS) data used to produce the Big River watershed maps. Metadata, Big River Identification Information: Citation: Citation Information: Originator: California Department of Conservation, California Geological Survey Publication Date: June, 2005 Edition: 1 Title: Plate 1 - Geologic and Geomorphic Features Related to Landsliding, Big River Watershed, Mendocino County, California Plate 2 - Relative Landslide Potential with Geologic and Geomorphic Features, Big River Watershed, Mendocino County, California Watershed Mapping Series, Map Set 9, CD # Geospatial Data Presentation Form: vector digital data Online Linkage: Description: Abstract: Digital geospatial data portraying landslides, geomorphic features related to landsliding, relative landslide potential, geology, and stream channel geomorphic conditions in the Big River Watershed, Mendocino County, California. This dataset is the product of a CGS investigation of landslides and fluvial geomorphology in the Big River watershed. The study area includes the Big River basin and is located in Mendocino County in northwestern California. The investigation was based on interpretation of 1947, 1984 and 2000 aerial photos, findings from CGS s landslide mapping conducted in the early 1980s (Kilbourne, R.T , Manson, M.W. 1984), as well as other sources (McLaughlin, 1997 and Matthews, 2001). Mapping was conducted at a scale of 1:24,000. CGS created the Geologic and Geomorphic Features Related to Landsliding, Big River

2 Watershed map (Plate 1) and Relative Landslide Potential with Geologic and Geomorphic Features, Big River Watershed map (Plate 2). Fluvial geomorphic mapping and information is not represented on the hard-copy maps, but is included in the GIS data. This study was conducted at a regional scale of mapping using two sets of aerial photos combined with a compilation of earlier published and unpublished work. Other photo sets may reveal additional landslides and fluvial features. The regional nature of the study makes the data and maps, including the relative landslide potential zones, inappropriate as a substitute for site-specific analysis. Time Period of Content: 1936, 1947, 1952, 1965, 1978, 1982, 1983, 1984, 1988, and 2000 Time Period Information: Single Date/Time: Calendar Date: Currentness Reference: 2005 Status: Progress: Complete Maintenance and Update Frequency: Irregular Spatial Domain: Bounding Coordinates: West Bounding Coordinate: East Bounding Coordinate: North Bounding Coordinate: South Bounding Coordinate: Keywords: Theme: Theme Keyword Thesaurus: none Theme Keywords: landslide, historically active, dormant, geomorphology, rock slide, debris slide, debris flow, earthflow, relative landslide potential, geomorphic features, geomorphology, disrupted ground, debris slide slope, inner gorge, fluvial, stream, stream feature, sediment, alluvial contacts, channel classification, watershed characteristics, geology, geologic, unit, contact, fault, structure, bedding, strike and dip, watershed, watershed assessment, California Geological Survey, CGS, map Place: Place Keywords: Big River, Mendocino County, North Coast, California Temporal: Temporal Keyword: 1936, 1947, 1952, 1965, 1978, 1982, 1983,1984, 1988, 2000 Access Constraints:

3 Dataset should be obtained from the Department of Conservation, California Geological Survey to ensure that user has the most recent version available. Use Constraints: California Department of Conservation, California Geological Survey, All rights reserved. No part of this dataset may be reproduced, transmitted, or distributed in any form or by any means, electronic or mechanical, for any purpose, without the express written permission of the California Geological Survey except as follows. Permission is granted to reproduce prints of all or part of the data under the following conditions: (1) For personal use. (2) For publication in a report in unmodified form, cite on figure or in text as "Reproduced with permission, California Geological Survey CD-ROM (2005), Watershed Mapping Series, Map Set 9, Big River Watershed, Mendocino County, California." (3) For publication in a report in modified form, cite on figure or in text as "Modified from California Geological Survey from CD-ROM (2005), Watershed Mapping Series, Map Set 9, Big River Watershed, Mendocino County, California." The landslide and geomorphic features were mapped/compiled at a scale of 1:24,000 (1 inch equals 2,000 feet). The geologic data were also compiled at 1:24,000. Users of this dataset should be aware of the difference between precision and accuracy. While digital data can be displayed or reproduced precisely at any scale, the accuracy of the data remains constant. Accuracy of the map features in this database is not implied at scales larger than 1:24,000. The user is cautioned that this database is not suitable for site-specific analysis or applications. Information in this database is not sufficient to serve as a substitute for the geologic and geotechnical site investigations required under Chapters 7.5 and 7.8 of Division 2 of the California Public Resources Code. The Department of Conservation makes no warranties as to the suitability of this product for any particular purpose. This dataset should be used in conjunction with the published maps of the Watershed Mapping Series, Map Set 9, Geologic And Geomorphic Features Related To Landsliding, Big River Watershed (Plate 1), Relative Landslide Potential With Geologic And Geomorphic Features, Big River Watershed (Plate 2). The published maps produced by the California Department of Conservation represent the official printed record of these data, and will supersede any paper or digital versions produced by other

4 individuals or organizations. Instructions for ordering these maps in hardcopy or digital format are provided in the Distribution Information section of this document. Point of Contact: Contact Information: Contact Organization Primary: Contact Organization: California Geological Survey Contact Address: Address Type: mailing and physical address Address: 801 K Street, MS City: Sacramento State or Province: CA Postal Code: Country: United States Contact Voice Telephone: (916) Contact Facsimile Telephone: (916) Data Set Credit: Don Braun, John Curless, Karin Fresnel, and Dawn McGuire Native Data Set Environment: Microsoft Windows 2000 Service Pack 6; ESRI Arc Catalog 9.0 Data Quality Information: Attribute Accuracy: Attribute Accuracy Report: Initial checking of attributes was conducted by the geologists who mapped the features. Limited field assessment of attributes was completed. The 'confidence' attribute indicates the geologist's level of certainty in a given feature (typically as viewed through a stereoscope). Peer reviewers and GIS staff conducted additional quality control. Because the attribute fields are designed to address various types of mapping products, and because some data is compiled from other sources, not all attribute fields are populated. Positional Accuracy: Horizontal Positional Accuracy: Horizontal Positional Accuracy Report: Features were mapped at the same scale as the published map (1:24,000, or 1 inch equals 2000 feet). Further assessment of positional accuracy has not been conducted. The user is cautioned that the data are not suitable as a substitute for site-specific evaluation. Lineage: Source Information: Source Scale Denominator: 1:24,000

5 Type of Source Media: Heads-up digitizing Process Step: Process Description: Mapping: This map set was compiled from multiple sources including published and unpublished maps and reports, aerial photograph mapping, and reconnaissance geologic mapping. Limited field verification was performed. Aerial photographs and compilation of the existing data were the primary information sources for this product. Landslides are classified following DMG, 1997, and Cruden and Varnes,1996. Landslide activity is classified following Keaton and DeGraff, 1996.Several sets of aerial photographs were stereoscopically evaluated for geomorphic features related to landsliding in the watershed. Minimal field assessment of the mapped landslide-related features was performed. As part of the above process, the debris slide slope mapping was compared to slope models based on a 10-meter resolution digital elevation model (DEM) generated from 7.5-minute topographic quadrangle maps by the US Geological Survey. A Geographic Information System (GIS) was used to plot topographic slope from the DEM. The distribution of steep slope areas (greater than 65 percent) and the areas delineated by the SHALSTAB model (Dietrich, et al., 2000) were then compared with the mapped geomorphic features. The SHALSTAB model was run using a 10 meter DEM, with default values of 1700 kilograms per cubic meter and friction angle of 45 degrees. Areas with a SHALSTAB rating of less than 2.8 that were not otherwise mapped were reviewed and mapped if appropriate. Debris slide slope areas not covered by both GIS and photointerpreted areas were subsequently checked on the aerial photographs. Data Capture: Geomorphic features were compiled from aerial photos onto clear acetate overlays and transferred to a stable mylar base for digitizing. USGS orthophoto quarter-quadrangle with topographic contours and other base layers were used to aid in this process. The features were then digitized using Arcinfo software. Relative Landslide Potential Map: The Relative Landslide Potential Map was generated using a landslide potential matrix prepared by geologists familiar with the study area. The matrix is based on landslide feature type and activity, geomorphic features, geology, slope found within the watershed, and information on specific landslides gathered during field visits. The matrix is included in the data dictionary with the

6 relative landslide potential layer information. ArcInfo polygon coverages were used to delineate landslide and geomorphic feature types as well as geologic units. 10-meter DEMs were used to derive slope. Individual geologic and geomorphic coverages were converted to ARCINFO grids and assigned values according to the matrix. The individual grids were then merged into a final grid. Where more than one landslide potential value was applicable to a cell, the highest value was assigned. The relative landslide potential data is derivative, based on the following: 1) the occurrence and distribution of landslides, and other types of slope failure and features indicating slope instability; 2) the geology of the area, including bedrock types and lithologic properties relative to slope stability and distribution of various earth materials, as well as the structural framework, and 3) the relative behavior of slopes within the area as interpreted from analysis of historic aerial photographs and recent field observations. The relative landslide potential categories are compiled in a Geographic Information System (GIS) using the geologic and geomorphic information presented on this map. The GIS was used to ensure that, where appropriate, relative landslide potential categories were applied consistently. Through this process, consistency in categories was maintained while at the same time specific conditions were identified and categorized. Process Date: Process Contact: Contact Information: Contact Organization Primary: Contact Organization: California Geological Survey Contact Person: CGS Front Desk Contact Voice Telephone: (916) (CGS front desk) Contact Facsimile Telephone: (916) Spatial Reference Information: Horizontal Coordinate System Definition: Planar: Grid Coordinate System: Grid Coordinate System Name: Universal Transverse Mercator Universal Transverse Mercator: UTM Zone Number: 10 Transverse Mercator: Scale Factor at Central Meridian: Longitude of Central Meridian: Latitude of Projection Origin: False Easting:

7 False Northing: Planar Coordinate Information: Planar Coordinate Encoding Method: coordinate pair Coordinate Representation: Abscissa Resolution: Ordinate Resolution: Planar Distance Units: meters Geodetic Model: Horizontal Datum Name: North American Datum of 1983 Ellipsoid Name: Geodetic Reference System 80 Semi-major Axis: Denominator of Flattening Ratio: Horizontal Coordinate System Definition: Planar: Map Projection Name: Albers Conical Equal Area Standard Parallel: Standard Parallel: Longitude of Central Meridian: Latitude of Projection Origin: False Easting: False Northing: Planar Coordinate Information: Planar Coordinate Encoding Method: coordinate pair Coordinate Representation: Abscissa Resolution: Ordinate Resolution: Planar Distance Units: meters Geodetic Model: Horizontal Datum Name: North American Datum of 1927 Ellipsoid Name: Clarke 1866 Semi-major Axis: Denominator of Flattening Ratio: Entity and Attribute Information: Please see data dictionary (big data dict.doc) Distribution Information: Distributor: Contact Information: Contact Organization Primary: Contact Organization: California Geological Survey Contact Address: Address Type: mailing and physical address

8 Address: California Geological Survey, Publications 801 K Street City: Sacramento State or Province: CA Postal Code: Country: United States Contact Voice Telephone: (916) Contact Facsimile Telephone: (916) Resource Description: Provided on CD-ROM, print on demand, maps are downloadable at htm Distribution Liability: Standard Order Process: Digital Form: Digital Transfer Information: Transfer Size: Digital Transfer Option: Online Option: Computer Contact Information: Network Address: Network Resource Name: Offline Option: Offline Media: CD-ROM Fees: Data is free when downloaded from web site above, or may be purchased on CD-ROM or printed on demand for nominal fee from the Department of Conservation. You can order these data, digital or hardcopy maps, or other publications by phone using VISA, MasterCard, or American Express, or by mail with check, money order, or credit card. For information about CGS programs or publications, call (916) or visit our web site at Technical Prerequisites: The database is provided in ESRI interchange file (.e00) and shapefile formats. Metadata Reference Information: Metadata Date: June 30, 2005 Metadata Contact: Dave Dixon Contact Information: Contact Organization Primary: Contact Organization: California Geological Survey Contact Person: Contact Address: Address Type: mailing and physical address Address: California Geological Survey, 801 K Street City: Sacramento

9 State or Province: CA Postal Code: Country: United States Contact Voice Telephone: (916) (CGS front desk) Contact Facsimile Telephone: (916) Metadata Standard Name: FGDC Content Standards for Digital Geospatial Metadata Metadata Standard Version: FGDC-STD Metadata Use Constraints: Although these data have been produced by professional scientists and organizations, the California Department of Conservation, California Geological Survey makes no warranty, expressed or implied, regarding its data or utility. It is recommended that careful attention be paid to the contents of any metadata associated with a file, and that the originator of the data be contacted with any questions regarding appropriate use. Department of Conservation, California Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein.

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