1996-2000 NOAA/USGS/NASA Airborne LiDAR Assessment of Coastal Erosion (ALACE) Project for the US Coastline

Metadata also available as

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator:
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC)
Publication_Date: Unknown
Title:
1996-2000 NOAA/USGS/NASA Airborne LiDAR Assessment of Coastal Erosion (ALACE) Project for the US Coastline
Publication_Information:
Publication_Place: Charleston, SC
Publisher: NOAA's Ocean Service, Coastal Services Center (CSC)
Online_Linkage: <http://www.csc.noaa.gov/ldart>
Description:
Abstract:
This data set includes data collected from 1996-2000 and covers the states of AL,FL,LA,MS,DE,MD,VA,CT,MA,ME,NH, NJ,NY,RI,NC,SC,GA,CA OR,WA,TX OH,PA. Laser beach mapping uses a pulsed laser ranging system mounted onboard an aircraft to measure ground elevation and coastal topography. The laser emits laser beams at high frequency and is directed downward at the earth's surface through a port opening in the bottom of the aircraft's fuselage. The laser system records the time difference between emission of the laser beam and the reception of the reflected laser signal in the aircraft. The aircraft travels over the beach at approximately 60 meters per second while surveying from the low water line to the landward base of the sand dunes.
Purpose:
This data was collected as part of an effort to map beach topography efficiently and cheaply.
Supplemental_Information:
This data set was collected with a LIDAR (LIght Detection and Ranging) instrument designed and developed by the Observational Sciences Branch (OSB) of NASA at the Wallops Flight Facility in Virginia. The instrument, originally designed for mapping ice sheets in Greenland, is called the Airborne Topographic Mapper or ATM. The ATM II (the latest version), operates with a Spectra Physics laser transmitter, which provides a 7 nanoseconds long, 250 micro joules pulse at a frequency-doubled wavelength of 523 nanometers in the blue-green spectral region. The laser transmitter can function at pulse rates from 2 to 10 kilohertz (kHz). The laser system with a separate cooling unit weighs approximately 45 kilograms (kg) and requires approximately 15 amperes of power at 115 volts. The transmitted laser pulse is reflected to the surface of the earth with the aid of a small folding mirror mounted on the back of a secondary mirror of a rotating scan mirror assembly mounted directly in front of the telescope. The scan mirror, which is rotated at 20 hertz, is comprised of a section of round aluminum stock, machined to a specific off-nadir angle. A scan mirror with the off-nadir angle of 15 degrees was utilized, producing an elliptical scan pattern with a swath width equal to 50 percent of the approximately 700-meter aircraft altitude. The reflected laser pulse is transmitted to a photo-multiplier assembly that consists of a lens, a narrow bandpass filter, and a single photomultiplier tube. Note: The Spatial Reference section of this document may lack fully FGDC-compliant information regarding projection parameters (i.e., Central meridian, false Northing, etc.). The State Plane or UTM Zone will be supplied, and the corresponding parameters can be found in Appendix C of: Snyder, John, 1987, Map Projections, a Working Manual (U.S. Geological Survey Professional Paper 1395): Washington, U.S. Government Printing Office.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19961009
Ending_Date: 20001102
Currentness_Reference: Ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -124.621351
East_Bounding_Coordinate: -69.692954
North_Bounding_Coordinate: 47.885630
South_Bounding_Coordinate: 25.633621
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: Elevation
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: lidar
Theme_Keyword: laser
Theme_Keyword: beach
Theme_Keyword: Bathymetry/Topography
Theme_Keyword: digital elevation model
Theme_Keyword: DEM
Theme_Keyword: erosion
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: U.S. Coastline
Place_Keyword: Alabama
Place_Keyword: Delaware
Place_Keyword: Maryland
Place_Keyword: North Carolina
Place_Keyword: South Carolina
Place_Keyword: Virginia
Place_Keyword: Connecticut
Place_Keyword: Massachusetts
Place_Keyword: Maine
Place_Keyword: New Hampshire
Place_Keyword: New Jersey
Place_Keyword: New York
Place_Keyword: Rhode Island
Place_Keyword: Florida
Place_Keyword: Louisiana
Place_Keyword: Mississippi
Place_Keyword: Georgia
Place_Keyword: California
Place_Keyword: Oregon
Place_Keyword: Washington
Place_Keyword: Texas
Place_Keyword: Ohio
Place_Keyword: Pennsylvania
Access_Constraints: None
Use_Constraints:
This data was collected for the purposes of research. Any conclusions drawn from analysis of this information are not the responsibility of NOAA or the Coastal Services Center. This data is likely to contain returns from the water surface and vegetation. No processing has been done to remove returns from water or vegetation. Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC)
Contact_Position: CEM Project Scientist
Contact_Address:
Address_Type: mailing and physical address
Address: 2234 South Hobson Avenue
City: Charleston
State_or_Province: South Carolina
Postal_Code: 29405
Country: United States
Contact_Voice_Telephone: (843) 740-1200
Contact_Electronic_Mail_Address: tcm@csc.noaa.gov
Data_Set_Credit:
Airborne Topographic Mapper LIDAR data were collected in partnership with the National Oceanic and Atmospheric Administration (NOAA) Coastal Services Center, the NASA Wallops Flight Facility, the U. S. Geological Survey (USGS) Center for Coastal and Regional Marine Geology, and the NOAA Aircraft Operations Center.
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Raw elevation measurements have been determined to be vertically accurate to within 15 cm. Processing steps (datum conversion, projection, grid interpolation, etc.) introduce additional error factors which have not been tested at the time of this publication.
Logical_Consistency_Report: Not applicable.
Completeness_Report:
All elevation data points that appeared to be within a reasonable vertical range were retained, and other points were thrown away. This filtering process was performed 'by eye'.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The ATM LIDAR elevation points are known to be horizontally accurate to +/- 0.8 meters at an aircraft altitude of 700 meters.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The ATM LIDAR elevation measurements have been found to be within +/- 15 centimeters of each other in successive and overlapping passes of the same area. In comparisons of LIDAR data for a small geographic region with various ground surveys the differences are between +/- 15 to 20 centimeters. The accuracy of the majority of the data is estimated to be consistent with the above stated results. At this time, there has been no large scale verification of the data.
Lineage:
Process_Step:
Process_Description:
The vertical values in this data set have been filtered through visual inspection to find abnormally high and abnormally low values. In addition, this data was processed using a spatial filtering program that identifies and discards outlier elevation measurements. This program reads each elevation measurement within a file and identifies "spatially close" points (i.e. those neighboring points within a fixed radius of the point). The mean and standard deviation is calculated using the elevations of these points. If the elevation difference from the mean of the point under consideration is more than 2 standard deviations and greater than a defined distance the point is discarded.
Process_Date: Unknown
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Spatial_Reference_Information:
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC)
Contact_Position: CEM Project Scientist
Contact_Address:
Address_Type: mailing and physical address
Address: 2234 South Hobson Avenue
City: Charleston
State_or_Province: SC
Postal_Code: 29405-2413
Contact_Voice_Telephone: 843-740-1200
Contact_Electronic_Mail_Address: tcm@csc.noaa.gov
Resource_Description: Downloadable Data
Distribution_Liability:
This data was collected for the purposes of research. Any conclusions drawn from analysis of this information are not the responsibility of NOAA, the Coastal Services Center, or its partners.
Custom_Order_Process:
This data can be obtained on-line at the following URL: <http://www.csc.noaa.gov/ldart>. The data set is dynamically generated based on user-specified parameters.
Metadata_Reference_Information:
Metadata_Date: 19980331
Metadata_Review_Date: 20070626
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NOAA Coastal Services Center
Contact_Position: CEM Project Scientist
Contact_Address:
Address_Type: mailing and physical address
Address: 2234 South Hobson Avenue
City: Charleston
State_or_Province: SC
Postal_Code: 29405-2413
Contact_Voice_Telephone: 843-740-1200
Contact_Electronic_Mail_Address: tcm@csc.noaa.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Generated by mp version 2.9.1 on Tue Apr 8 11:47:03 2008