Contour Data and Survey Control for the Assumed Pre-2007 Surface Of the Northridge Bluff Landslide

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: USGS
Publication_Date: 2007
Title:
Contour Data and Survey Control for the Assumed Pre-2007 Surface Of the Northridge Bluff Landslide
Geospatial_Data_Presentation_Form: digital data and spreadsheet
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2007-1079
Publication_Information:
Publication_Place: Menlo Park, CA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage: <http://pubs.usgs.gov/of/2007/1079/>
Larger_Work_Citation:
Citation_Information:
Originator: Brian D. Collins
Originator: Robert Kayen
Originator: Thomas Reiss
Originator: Nicholas Sitar
Publication_Date: 2007
Title:
Terrestrial LIDAR Investigation of the December 2003 and January 2007 Activations of the Northridge Bluff Landslide, Daly City, California
Edition: 1.0
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2007-1079
Publication_Information:
Publication_Place: Menlo Park, CA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage: <http://pubs.usgs.gov/of/2007/1079/>
Description:
Abstract:
Provides contour data of topographic surface and processed survey coordinates for laser scanner locations used to register the lidar data sets.
Purpose:
This data set was developed to present topographic contour data and survey coordinates for engineers, public officials, policy makers, and the general public.
Supplemental_Information:
Additional information about the field activities from which this data set was derived are available online from the USGS Coastal and Marine Geology InfoBank at <http://walrus.wr.usgs.gov/infobank/l/l107ca/html/l-1-07-ca.meta.html>.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20070109
Ending_Date: 20070109
Currentness_Reference: ground condition
Status:
Progress: complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -122.49646
East_Bounding_Coordinate: -122.49419
North_Bounding_Coordinate: 37.68243
South_Bounding_Coordinate: 37.68063
Keywords:
Theme:
Theme_Keyword_Thesaurus: General
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: Western Coastal and Marine Geology
Theme_Keyword: LIDAR
Theme_Keyword: landslide
Theme_Keyword: coastal bluffs
Theme_Keyword: Coastal Change Hazards
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: elevation
Theme_Keyword: geoscientificInformation
Theme_Keyword: oceans and estuaries
Place:
Place_Keyword_Thesaurus: General
Place_Keyword: Northridge Bluff
Place_Keyword: Avalon Canyon
Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: California
Place_Keyword: San Mateo County
Place_Keyword: Daly City
Access_Constraints: None
Use_Constraints:
Public domain data from the U.S. government are freely redistributable with proper metadata and source atttribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.

Some USGS information accessed through this means may be preliminary in nature and presented without the approval of the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the responsibility of the user.

This information is not intended for navigational purposes.

Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Brian D. Collins
Contact_Address:
Address_Type: mailing and physical address
Address: USGS, Mail Stop 999, 345 Middlefield Road
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA
Contact_Voice_Telephone: (650) 329-5466
Contact_Electronic_Mail_Address: bcollins@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name:
<http://pubs.usgs.gov/of/2007/1079/of2007-1079_data/of2007-1079_images.zip/>
Browse_Graphic_File_Description:
Un-zipping of2007-1079_images.zip gives access to the image file, of2007-1079_images/Pre2007 Contour Map.jpg. In the PDF document, Figure 7 shows the lidar data coverage and set up locations. Figures 12 and 15 show the area and contour data available.
Browse_Graphic_File_Type: JPEG


Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Lidar-derived points and their associated surfaces and contours are accurate to 15 centimeters except in the modified landslide toe which are assumed conditions.
Logical_Consistency_Report:
Surface and contour data has been visually examined and compared to other data sets of the area to assure logical consistency.
Completeness_Report:
Ommissions and gaps in data reflect data out of view or range of the laser scanner at time of data acquisition.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Lidar-derived points are accurate to 15 centimeters, measured as three-dimensional error. This includes 1.5 cm laser error, 3 cm survey control error, and 10 cm post-processing registration error. Assumed topography at the landslide toe is not identified with an estimated accuracy.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Lidar-derived points are accurate to 15 centimeters, measured as three-dimensional error. This includes 1.5 cm laser error, 3 cm survey control error, and 10 cm post-processing registration error. Assumed topography at the landslide toe is not identified with an estimated accuracy.
Lineage:
Process_Step:
Process_Description:
The 2007 lidar data was collected from 6 locations using DGPS to georeference the origin of each scan. All locations were georeferenced to neighboring scans using surface registsration algorithms that maintained the origin, only allowing relative rotation of the data sets. Data was cleaned of bad laser returns, filtered to a minimum point spacing of 20 centimeters, and processed into a continuous triangulated surface. The landslide toe area, exposed on the beach, was modified to simulate the geometry following several years of wave action. The toe was constructed to match the existing topography of the bluff north and south of the landslide. Contours were generated from the processed and modified surface.
Process_Date: 2007
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Brian D. Collins
Contact_Address:
Address_Type: mailing and physical address
Address: USGS, Mail Stop 999, 345 Middlefield Road
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA
Contact_Voice_Telephone: (650) 329-5466
Contact_Electronic_Mail_Address: bcollins@usgs.gov


Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 195379 points describe the full set of contours.


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: 0.9996
Longitude_of_Central_Meridian: -123.00000
Latitude_of_Projection_Origin: 0.00000
False_Easting: 0.00000
False_Northing: 0.00000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.2
Ordinate_Resolution: 0.2
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983 (NAD83)
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: North American Vertical Datum of 1988 (NAVD88)
Altitude_Resolution: 0.2
Altitude_Distance_Units: meters
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates


Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Survey Control
Entity_Type_Definition: Control points used for registration.
Entity_Type_Definition_Source: USGS
Attribute:
Attribute_Label: Conrol Point
Attribute_Definition: Name of general location of control station site
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Unrepresentable_Domain: Character string identifying the station site
Attribute:
Attribute_Label: Northing
Attribute_Definition: UTM Y coordinate of control station location
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4170565.103
Range_Domain_Maximum: 4170753.436
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.03
Attribute:
Attribute_Label: Easting
Attribute_Definition: UTM X coordinate of control station location
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 544417.118
Range_Domain_Maximum: 544601.503
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.03
Attribute:
Attribute_Label: Ground Elev.
Attribute_Definition: Elevation of control station location
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4.225
Range_Domain_Maximum: 116.186
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.03
Attribute:
Attribute_Label: Instrument Height
Attribute_Definition: Height of instrument used at control station
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.562
Range_Domain_Maximum: 1.830
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.03
Attribute:
Attribute_Label: Instrument Elevation
Attribute_Definition: Elevation of instrument at control station location
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 5.835
Range_Domain_Maximum: 118.016
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.03
Detailed_Description:
Entity_Type:
Entity_Type_Label: contour lines
Entity_Type_Definition: points and vectors describing contour data
Entity_Type_Definition_Source: USGS
Attribute:
Attribute_Label: X or Easting
Attribute_Definition: UTM X coordinate of point describing contour data
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 544386.732
Range_Domain_Maximum: 544616.018
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.20
Attribute:
Attribute_Label: Y or Northing
Attribute_Definition: UTM Y coordinate of point describing contour data
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4170486.919
Range_Domain_Maximum: 4170738.475
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.20
Attribute:
Attribute_Label: Z or Ground Elev.
Attribute_Definition: Elevation Z coordinate of point describing contour data
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.000
Range_Domain_Maximum: 139.000
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.20


Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Brian D. Collins
Contact_Address:
Address_Type: mailing and physical address
Address: USGS, Mail Stop 999, 345 Middlefield Road
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA
Contact_Voice_Telephone: (650) 329-5466
Contact_Electronic_Mail_Address: bcollins@usgs.gov
Distribution_Liability:
Although this dataset has been used by the U.S. Geological Survey, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Reference made to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.


Metadata_Reference_Information:
Metadata_Date: 20070306
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Brian D. Collins
Contact_Address:
Address_Type: mailing and physical address
Address: USGS, Mail Stop 999, 345 Middlefield Road
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA
Contact_Voice_Telephone: (650) 329-5466
Contact_Electronic_Mail_Address: bcollins@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998


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