U.S. Geological Survey
2007
EAARL Topography-Assateague Island National Seashore-Lidar GeoTIFF
First
remote-sensing image
EAARL Lidar Submarine Topographic Maps
1176
The United States Geological Survey (USGS), in cooperation with the National Park Service (NPS) and the National Aeronautics and Space Administration (NASA), provides the coastal management community with digital elevation products. The USGS processes aircraft lidar data provided by NASA, develops software tools and algorithms to use and analyze the data, and makes products available to the coastal management community.
http://pubs.usgs.gov/of/2007/1176/start.html
LiDAR is a remote sensing technique that uses laser light to detect, range, or identify remote objects based on light reflected by the object or emitted through it subsequent fluorescence. Airborne ranging LiDAR is now being applied in coastal environments to produce accurate, cost-efficient elevation datasets with high data density. The USGS in cooperation with NASA and NPS is using airborne LiDAR to measure the topography of Assateague Island National Seashore land features. Elevation measurements were collected over Assateague Island National Seashore using the NASA Experimental Advanced Airborne Research LiDAR (EAARL), a pulsed laser ranging system mounted onboard an aircraft to measure subaerial and submarine coastal topography. With the NASA EAARL LiDAR system, submarine data is generally acquired to a maximum of approximately 1.5 secchi depths (a measure of water clarity). The system uses a high frequency laser beam 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 Experimental Advanced Airborne Research LiDAR, developed by the NASA Wallops Flight Facility (WFF) in Virginia, measures ground elevation with a vertical resolution of roughly 15 centimeters. A sampling rate of up to 3 kHz results in an extremely dense spatial elevation data set.
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 .
These LiDAR-derived topography maps were produced as a collaborative effort between the USGS Coastal and Marine Geology Program, NPS South Florida/Caribbean Network Inventory and Monitoring Program, and the NASA Wallops Flight Facility. One objective of this research is to create techniques to survey coral reefs and barrier islands for the purposes of geomorphic change studies, habitat mapping, ecological monitoring, change detection, and event assessment. As part of this project, data from an innovative instrument under development at the NASA Wallops Flight Facility, the NASA Experimental Airborne Advanced Research LiDAR (EAARL) are being used. This sensor has the potential to make significant contributions in this realm for measuring subaerial and submarine topography wthin cross-environment surveys. High spectral resolution, water-column correction, and low costs were found to be key factors in providing accurate and affordable imagery to costal resource managers.
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 USGS converts raw LiDAR data into a GIS-compatible map product to be provided to National Park Service GIS specialists, managers, and scientists. The primary tool used in the conversion process is Airborne LiDAR Processing System (ALPS), a multi-tiered processing system developed by a USGS/NASA collaborative project for the use of subaerial and submarine LiDAR in coastal 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 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.
20040731
20040801
20040803
20040804
20040805
20040808
20040809
ground condition
Unknown
-75.35183
-75.080075
38.317083
37.847849
USGS Metadata Identifier
USGS:3b5f2c63-b2e9-4b08-9beb-edb15b37f6e2
ISO 19115 Topic Category
elevation
None
LiDAR
Experimental Advanced Airborne Research Lidar
digital elevation model
elevation change
laser altimetry
derived surface
coastal resource management
submerged topography
Airborne LiDAR Processing System
benthic cover types
bare earth elevations
Data Categories for Marine Planning
distributions
bathymetry and elevation
Marine Realms Information Bank (MRIB) Keywords
altimetry
topographic mapping
USGS Thesaurus
LIDAR
topography
digital elevation models
None
Assateague Island National Seashore
Atlantic Coast
Virginia
United States East Coast
Maryland
Any use of these data signifies a user's agreement to comprehension and compliance of the USGS Standard Disclaimer. Ensure all portions of metadata are read and clearly understood before using these data in order to protect both user and USGS interests. See section 6.3 Distribution Liability.
Although the USGS is making these data sets available to others who may find the data of value, USGS 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 data sets are not for navigational purposes. USGS is providing these data "as is", and USGS 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 USGS 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 Center for Coastal and Watershed Studies 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 USGS 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.
United States Geological Survey, Center for Coastal and Watershed Studies
Dr. John C. Brock
Research Oceanographer
mailing and physical address
600 4th Street South
St. Petersburg
Florida
33701-
USA
727 803-8747 ext3088
727 803-2031
jbrock@usgs.gov
Monday-Friday, 8-5, EST
http://pubs.usgs.gov/of/2007/1176/HTML/images/ASIS_Tile_Map.jpg
EAARL Topography - Assateague Island National Seashore
JPG
The USGS Center for Coastal and Watershed Studies would like to acknowledge NASA Goddard Space Flight Center for their cooperation and assistance in the development of the data. The USGS would also like to acknowledge Park Management and personnel at Assateague Island National Seashore.
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcMap 9.1.0.722, ERDAS Imagine 8.7, ESRI ArcCatalog 9.1.0.722
Brock, J.C.; Wright, C.W.; Sallenger, A.H; Krabill, W.B., and Swift, R.N
2003
Basis and Methods of NASA Ariborne Topographic Mapper LiDAR Surveys for Coastal Studies
journal article
West Palm Beach, FL
Journal of Coastal Research
Wright, C.W. and J. Brock
2002
EAARL: A LiDAR for mapping shallow coral reefs and other coastal environments
20-22, May 2002
proceedings article
Miami
Proceedings of the Seventh International Conterence on Remote Sensing for Marine and Coastal Environments
John Brock and Asbury Sallenger, US Geological Survey
2001
Airborne Topographic LiDAR Mapping for Coastal Science and Resource Management
USGS Open File Report
St. Petersburg, FL
US Geological Survey
The expected accuracy of the measured variables are as follows: attitude within 0.07 degree, 3-cm nominal ranging accuracy, and vertical elevation accuracy of +/-20 cm for the "first return" surface. Quality checks are built into the data-processing software.
Each file contains data located in a 2-km by 2-km tile, where the upper-left bound can be assessed quickly through the file name. The first 3 numbers in the file name represent the left-most UTM easting coordinate (e###000) in meters, the next 4 numbers represent the top-most UTM northing coordinate (n####000) in meters, and the last 2 numbers (##) represent the UTM zone in which the tile is located (for example, ba_e123_n4567_20).
Several regions of the dataset are labeled as "No Data", which corresponds to a cell value of -100 m in the GeoTiff file. These "No Data" areas are a result of the survey not covering a particular region, optical water depth of greater than 1.5 Secchi disc depths, or the manual removal of lidar processing artifacts.
Raw elevation measurements have been determined to be within 1 meter horizontal accuracy. Processing steps (grid interpolation) may introduce additional error which has not been tested at the time of this publication.
Elevations of the DEM are vertically consistent with the point elevation data, +/-20 cm.
NASA Collected the EAARL LiDAR data and distributed to USGS for processing
2007
EAARL Topography-Assateague Island National Seashore
raster digital data
Point elevation measurements collected by the EAARL sensor.
20040824
ground condition
none
none
The data are collected using a Cessna 310 aircraft. The NASA Experimental Advanced Airborne Research LiDAR (EAARL) laser scanner collects the data using a green (532nm) raster scanning laser, while a digital camera acquires a visual record of the flight. The data are stored on hard drives and archived at the USGS office in St. Petersburg and the NASA office at Wallops Flight Facility. The navigational data are processed at Wallops Flight Facility. The navigational and raw data are then downloaded into the Airborne LiDAR Processing System (ALPS). Data are converted from units of time to x,y,z points for elevation. The derived surface data can then be converted into raster data (geotiffs).
2004
United States Geological Survey, FISC St. Petersburg
Amar Nayegandhi
Computer Scientist
mailing and physical address
600 4th Street South
St. Petersburg
Florida
33701
USA
727-803-8747
8:00am to 5:00pm Monday thru Friday, EST
Call Survey for Details
The raster dataset was opened in ERDAS IMAGINE for editing. An Area of Interest (AOI) polygon was drawn around regions of poor data quality. Poor data quality was determined visually by locating gaps in the data as well as artifacts of the lidar processing. Pixels within the AOI polygons were given a raster value of -100 to correspond with other areas of No Data.
20060901
United States Geological Survey, FISC St. Petersburg
Amar Nayegandhi
Computer Scientist
mailing and physical address
600 4th Street South
St. Petersburg
Florida
33703
727-803-8747
727-803-2031
Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog.
20170124
U.S. Geological Survey
Alan O. Allwardt
Contractor -- Information Specialist
mailing and physical address
2885 Mission Street
Santa Cruz
CA
95060
831-460-7551
831-427-4748
aallwardt@usgs.gov
Added keywords section with USGS persistent identifier as theme keyword.
20201013
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Raster
Pixel
2000
2000
1
Universal Transverse Mercator
18
0.999600
-75.000000
0.000000
500000.000000
0.000000
row and column
1.000000
1.000000
meters
North American Datum of 1983
Geodetic Reference System 80
6378137.000000
298.257222
North American Vertical Datum of 1988
.01
meters
Explicit elevation coordinate included with horizontal coordinates
North American Vertical Datum of 1988
.01
meters
Explicit depth coordinate included with horizontal coordinates
This Digital Elevation Model (DEM) is a Geotiff derived from point data. It is raster data consisting of cells. Each cell has an elevation value associated with it. Cell size is 1 meter by 1 meter.
This Digital Elevation Model is a Geotiff derived from point data referenced to WGS84, NAD83 UTM eastings and northings (m). The variables measured by EAARL are: distance between aircraft and GPS satellites (m), attitude information (roll, pitch, heading in degrees), scan angle (degrees), second of the epoch (sec), and 1-ns time-resolved return intensity waveform (digital counts). It is raster data consisting of cells. Each cell has an elevation value associated with it. Cell size is 1 meter by 1 meter.
United States Geological Survey, FISC St. Petersburg
Amar Nayegandhi
Computer Scientist
mailing address
600 4th Street South
St. Petersburg
FL
33701
USA
727-803-8747
Open File Report 2007-1176 - EAARL Topography-Assateague Island National Seashore
The United States Geological Survey (USGS) shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics are not legal documents and are not intended to be used as such.The information contained in these data is dynamic and may change over time. The data are not better than the original sources from which they were derived. It is the responsibility of the data user to use the data appropriately and consistent within the limitations of geospatial data in general and these data in particular. The related graphics are intended to aid the data user in acquiring relevant data; it is not appropriate to use the related graphics as data.The USGS gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. It is strongly recommended that these data are directly acquired from an USGS server and not indirectly through other sources which may have changed the data in some way. Although these data have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made regarding the utility of the data on another system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data.
TIFF
2007
GeoTIFF
http://pubs.usgs.gov/of/2007/1176/HTML/raw_data.html
Data can be downloaded via the World Wide Web (WWW)
DVD
DVD
Vary
Contact U.S. Geological Survey.
Vary
Call USGS for Details
20211109
United States Geological Survey, St. Petersburg Coastal and Marine Science Center
SPCMSC Data Management Group
mailing and physical address
600 4th Street South
St. Petersburg
Florida
33701
US
727-502-8000
gs-g-spcmsc_data_inquiries@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998