Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 2008
Title: EAARL Bare Earth Topography-Colonial National Historical Park
Edition: First
Geospatial_Data_Presentation_Form: raster digital data
Series_Information:
Series_Name: Open File Report
Issue_Identification: 2008-1326
Publication_Information:
Publication_Place: FISC St. Petersburg
Publisher: U. S. Geological Survey
Other_Citation_Details:
The U. S. Geological Survey, in cooperation with the National Park Service (NPS) and the National Aeronautics and Space Administration (NASA), provides the coastal management community with usable digital elevation products. The U. S. Geological Survey processes aircraft Lidar data (provided by NASA), develops software tools and algorithms to use and analyze the data and make products available to the coastal management community through a variety of media, including the internet, CD-ROMs, DVDs and data reports.
Online_Linkage: http://pubs.usgs.gov/of/2008/1326/start.html
Description:
Abstract:
Elevation maps (also known as Digital Elevation Models or DEMs) of Colonial National Historical Park were produced from remotely-sensed, geographically-referenced elevation measurements in cooperation with NASA and NPS. Point data in ASCII text files were interpolated in a GIS to create a grid or digital elevation model (DEM) of each surface. Elevation measurements were collected in Virginia, over Colonial National Historical Park, using the NASA Experimental Advanced Airborne Research Lidar (EAARL), a pulsed laser ranging system mounted onboard an aircraft to measure ground elevation and topography. The system uses high frequency laser beams directed at the earth's surface through an 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 plane travels over the area at approximately 60 meters per second while surveying the base areas of the park. The EAARL, developed by the National Aeronautics and Space Administration (NASA) located at Wallops Flight Facility in Virginia, measures ground elevation with a vertical resolution of 15 centimeters. A sampling rate of 3 kHz or higher results in an extremely dense spatial elevation data set. Over 100 kilometers can easily be surveyed within a 3- to 4-hour mission time period. The ability to sample large areas rapidly and accurately is especially useful in morphologically dynamic areas.
For more information on Lidar science and the Experimental Advanced Airborne Research Lidar (EAARL) system and surveys, see
http://ngom.usgs.gov/dsp/overview/index.php and
http://ngom.usgs.gov/dsp/tech/eaarl/index.php .
One goal of the project is to produce highly detailed and accurate digital elevation maps (DEMs) of National Parks for use as a management tool and to make these maps available to scientists and natural resource managers within the parks.
Supplemental_Information:
Raw Lidar data is not in a format that is generally usable by resource managers and scientists for scientific analysis. Converting dense Lidar elevation data into a readily usable format without loss of essential information requires specialized processing. The U. S. Geological Survey converts raw Lidar data into a GIS-compatible map product to be provided to GIS specialists, managers, and scientists. The primary tool used in the conversion process is Airborne Lidar Processing System (ALPS), a multitiered processing system developed by a USGS/NASA collaborative for the use of topographic Lidar in park area change assessment. Specialized processing algorithms are used to convert raw waveform Lidar data acquired by the EAARL to georeferenced spot (x,y,z) returns for "first surface" and "bare earth" topography. These data are then converted to the NAD83 horizontal and NAVD88 vertical datum (using the Geoid 99 model). The final products are 2x2-km map tiles written out in a standard geotiff format with associated metadata information. These tiles are created for visual interpretation and regional quantitative analysis. Metadata files include the standard FGDC format.
Time_Period_of_Content:
Time_Period_Information:
Multiple_Dates/Times:
Single_Date/Time:
Calendar_Date: 20050418
Single_Date/Time:
Calendar_Date: 20050419
Single_Date/Time:
Calendar_Date: 20050420
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Unknown
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -76.841667
East_Bounding_Coordinate: -76.479167
North_Bounding_Coordinate: 37.287479
South_Bounding_Coordinate: 37.180544
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:d4ea1bdc-22db-42e4-9cd0-f6f1b1dfb6e6
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: Lidar
Theme_Keyword: Experimental Advanced Airborne Research Lidar
Theme_Keyword: digital elevation model
Theme_Keyword: elevation change
Theme_Keyword: laser altimetry
Theme_Keyword: derived surface
Theme_Keyword: resource management
Theme_Keyword: ALPS
Theme_Keyword: Airborne Lidar Processing System
Theme:
Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: distributions
Theme_Keyword: bathymetry and elevation
Theme:
Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) Keywords
Theme_Keyword: altimetry
Theme_Keyword: topographic mapping
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: LIDAR
Theme_Keyword: topography
Theme_Keyword: digital elevation models
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Colonial National Historical Park
Place_Keyword: Virginia
Stratum:
Stratum_Keyword_Thesaurus: none
Stratum_Keyword: Bare earth topography
Access_Constraints:
Any use of these data signifies a user's agreement to comprehension and compliance of the U. S. Geological Survey Standard Disclaimer. Ensure all portions of metadata are read and clearly understood before using these data in order to protect both user and U. S. Geological Survey interests. See section 6.3 Distribution Liability.
Use_Constraints:
Although the U. S. Geological Survey is making these datasets available to others who may find the data of value, the U. S. Geological Survey does not warrant, endorse, or recommend the use of thes data for any given purpose. The user assumes the entire risk related to the use of these data. These datasets are not for navigational purposes. The U. S. Geological Survey is providing these data "as is", and the U. S. Geological Survey disclaims any and all warranties, whether expressed or implied, including (without limitation) any implied warranties of merchantability or fitness for a particular purpose. In no event will the U. S. Geological Survey be liable to you or to any third party for any direct, indirect, incidental, consequential, special, or exemplary damages or lost profits resulting from any use or misuse of these data.Acknowledgement of the U.S. Geological Survey, FISC St. Petersburg as a data source would be appreciated in products developed from these data, and such acknowledgement as is standad for citation and legal practices for data source is expected by users of this data. Sharing new data layers developed directly from these data would also be appreciated by the U. S. Geological Survey staff. Users should be aware that comparisons with other data sets for the same area from other time periods may be inaccurate due to inconsistencies resulting from changes in photo interpretation, mapping conventions, and digital processes over time. These data are not legal documents and are not to be used as such.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U. S. Geological Survey, FISC St. Petersburg
Contact_Person: Dr. John C. Brock or Amar Nayegandhi
Contact_Position: Physical Oceanographer
Contact_Address:
Address_Type: mailing and physical address
Address: 600 4th Street South
City: Saint Petersburg
State_or_Province: Florida
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727 803-8747
Contact_Facsimile_Telephone: 727 803-2031
Hours_of_Service: 8:30-5:00 M-F EST
Browse_Graphic:
Data_Set_Credit:
The U. S. Geological Survey, FISC St. Petersburg, would like to acknowledge NASA Goddard Space Flight Center for their cooperation and assistance in the development of the data. The U. S. Geological Survey would also like to acknowledege National Park Service management and personnel at Colonial National Historical Park.
Security_Information:
Security_Classification_System: Unclassified
Security_Classification: Unclassified
Security_Handling_Description: Unclassified
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350
Cross_Reference:
Citation_Information:
Originator:
Brock, J.C.; Wright, C.W.; Sallenger, A.H; Krabill, W.B., and Swift, R.N
Publication_Date: 2003
Title:
Basis and Methods of NASA Ariborne Topographic Mapper Lidar Surveys for Coastal Studies
Geospatial_Data_Presentation_Form: journal article
Publication_Information:
Publication_Place: West Palm Beach, FL
Publisher: Journal of Coastal Research
Cross_Reference:
Citation_Information:
Originator: John Brock and Asbury Sallenger, US Geological Survey
Publication_Date: 2001
Title:
Airborne Topographic Lidar Mapping for Coastal Science and Resource Management
Geospatial_Data_Presentation_Form: USGS Open File Report
Publication_Information:
Publication_Place: St. Petersburg, FL
Publisher: US Geological Survey
