Tags
Polylines- Dikes, anticline and syncline hinge-surface traces, and isograds are commonly shown on geologic maps as lines that share three properties: they do not participate in map-unit topology, they correspond to features that exist within the Earth and may be concealed beneath younger, covering material; and they are likely to be located with an accuracy that can be estimated.
U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema)
Primary key. Values= GEL1, GEL2, GEL3, ... Null values not permitted.
U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema)
Classifier that specifies what kind of geologic feature is represented by a database element: geologic line.
U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema)
This is a flag for lines covered by an overlying map unit.
U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema)
Expresses whether or not the observations and data support the continuity or existence of a geologic feature.
Federal Geographic Data Committee, Digital Cartographic Standard for Geologic Map Symbolization, 2006
Expresses whether or not the observations and data support the stated nature, origin, or geometry of a mapped geologic feature.
Federal Geographic Data Committee, Digital Cartographic Standard for Geologic Map Symbolization, 2006
Radius in meters of positional uncertainty envelope.
U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema)
FGDC reference code assigned to the feature.
Federal Geographic Data Committee, Digital Cartographic Standard for Geologic Map Symbolization, 2006
A labeled fold
U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema)
Foreign key to DataSources table, to track provenance of each data element.
U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema)
Free text for additional information specific to this feature.
U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema)
Line type
U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema)
Data type = integer. If Cartographic Representations are used, this field is required.
U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema)
Data type = blob. If Cartographic Representations are used, this field is required.
U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema)
The following attributes are possible for records in the geologic line data: GeologicLines_ID, Type, IsConcealed, ExistenceConfidence, IdentityConfidence, LocationConfidenceMeters, Symbol, Label, DataSourceID, Notes, LTYPE, and RuleID1. Not all geologic lines have applicable attributes. Appropriate attributes are filled in for each line.
Oregon Department of Geology and Mineral Industries
This feature class identifies structural folds, lineaments, joints, and dikes located within the Dufur East and parts of Sherars Bridge and Summit Ridge 7.5 Quadrangles project study area. Features within this dataset are represented as vector lines. The vector line shows the approximate location and the angle down from horizontal of the plane that bisects the fold, as well as the general angle that the layers of rock dip away from that plane. This geodatabase contains cartographic representations for line symbols from Section 5 of FGDC Digital Cartographic Standard for Geologic Map Symbolization (FGDC Document Number FGDC-STD-013-2006)
The folds in this feature class represent the location, extent, and surface expression within the area of study where rocks have been compressed and folded.
Publication
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
Supported in part between 2014 and 2020 by the U.S. Geological Survey (USGS) STATEMAP [http://ncgmp.usgs.gov/about/statemap.html] component of the National Cooperative Geologic Mapping Program under assistance awards G15AC00180 and G20AC00202, and by the Oregon Water Resources Department through Interagency Agreements DOGAMI IAA# 12102013/OWRD 13 057 and DOGAMI IAA# DASPS-2542-16/OWRD IAA 16 047. Additional funds were provided by the State of Oregon through the Oregon Department of Geology and Mineral Industries (DOGAMI).
Care was taken to limit categorical attribute errors. Attribute accuracy of the database was visually inspected but despite the checks there may be some attributes that are still mislabeled.
Topology has been validated for the feature classes. Topology errors: 0. Topology exceptions: 7; MapUnitPolys must not have gaps 1 exception for project boundary of polygons; ContactsAndFaults must not have dangles 6 exceptions for faults. Duplicate point locations were found. No attempt has been made to correct the errors as they are related to multiple samples at one location, retesting of samples, and/or variance in Z values. Tests for logical consistency were performed by ArcGIS Topology software and GeMS Tools for Arc10.5 2018-03-04; Topology Check script and Validate Database script. All points, lines, and polygons were visually checked, and are labelled correctly.
Data collection does not include all possible traverses, measured sections, etc., and thereby is not complete. Not all field data were collected nor were all of the data compiled from lineage maps. Geologic concepts and definitions of map units are current. Density of observations is sufficient to support the map(s).
Data was collected and interpreted at a variety of scales. For field work, a combination of hillshade images from, DOGAMIs lidar 3 ft pixel bare earth DEM (approximately 1 point every 0.3 meters), NAIP imagery derived structure for motion (SFM) 5 m pixel bare earth DEM (approximately 1 point every 5 meters), and/or 10m pixel bare earth DEM (approximately 1 point every 10 meters) served as basemap(s). Precision mapping using, GPS, GIS, and the lidar imagery employed an application for the iPad, called iGIS. On the computer, line work was nominally drawn at a scale of 1:8,000. Also, geologic data was compiled from paper maps. Positional errors should be expected from input of digitized points and lines from paper maps and the errors that arise from georeferencing the paper maps (accuracy of content). Not all resources were tested to evaluate the degree to which these inaccuracies exist. Positional accuracy of geologic contacts, structures, and measurement points is influenced by the subjective judgment of the mappers or by interpretation of remotely sensed data (e.g., lidar). Therefore, the data user must consider the aforementioned methods of data collection and compilation in context of positional accuracy and understand that most lines and polygon boundaries are inferred based on geologic interpretations.
Maximum error calculated from the 1:8000 scale horizontal positional accuracy error.
Lineage maps were used as base maps in the following manner: 1) to compare the mapping against previous work; 2) scribing geologic features, e.g., bedding, faults, and folds; and 3) reference materials.
Topology checks were performed on the GeologicMap feature dataset by, employing the Topology check script provided in the GeMS Tools for Arc10.5 2018-03-04, and checking additional topology rules using Esri ArcGIS 10.7 for desktop. The Topology Check script in the GeMS toolkit provides additional checks for automation errors and geologic blunders. This script builds and evaluates an ArcGIS topology with these rules: no overlaps in ContactsAndFaults, no self-overlaps in ContactsAndFaults, no self intersections in ContactsAndFaults, no gaps in MapUnitPolys, no overlaps in MapUnitPolys, and all MapUnitPoly boundaries are covered by ContactsAndFaults arcs. Topology Check also evaluates node topology, summarizes the map units that bound ContactsAndFaults arcs, checks for duplicate point features, and identifies very small polygons in MapUnitPolys and very short arcs in ContactsAndFaults. Results of Topology Check should be taken with a grain of salt, as some issues flagged by this script may not be errors. In addition to the GeMS Topology Check the following are added topology rules checked for the dataset. Rule 1: ContactsAndFaults must not have dangles. Rule 2: Cartographic Lines must not self-overlap. Rule 3: Cartographic Lines must not self-intersect. Rule 4: Cartographic Lines must be single part.
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 geologic line data: GeologicLines_ID, Type, IsConcealed, ExistenceConfidence, IdentityConfidence, LocationConfidenceMeters, Symbol, Label, DataSourceID, Notes, LTYPE, and RuleID1. Not all geologic lines have applicable attributes. Appropriate attributes are filled in for each line.
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