U.S. Geological Survey
2009
ATM Coastal Topography--Alabama 2001
first
remote-sensing image
U.S. Geological Survey Data Series
418
Saint Petersburg, FL
U.S. Geological Survey
http://pubs.usgs.gov/ds/418/
A first surface elevation map was produced from remotely sensed, geographically referenced elevation measurements cooperatively by the U.S. Geological Survey (USGS) and National Aeronautics and Space Administration (NASA). Elevation measurements were collected over the area using the NASA Airborne Topographic Mapper (ATM), a scanning Lidar system that measures high-resolution topography of the land surface. The ATM system is deployed on a twin-otter or P3 aircraft and incorporates a green-wavelength laser operating at pulse rates of 2 to 10 kilohertz. Measurements from the laser ranging device are coupled with data acquired from inertial navigation system (INS) attitude sensors and differentially-corrected global positioning system (GPS) receivers to measure topography of the surface at accuracies of 10 to 20 centimeters.
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 .
The purpose of this project is to produce highly detailed and accurate elevation maps of the Alabama coastline for natural resource managers and research scientists.
Raw Lidar data are not in a format that is generally usable by resource managers and scientists. Converting dense Lidar elevation data into a readily usable format without loss of essential information requires specialized processing. The U.S. Geological Survey's Coastal and Marine Geology (CMG) Program has developed custom software to convert 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 Advanced Lidar Processing System (ALPS), a multi-tiered processing system developed by a USGS-NASA collaborative project. These data are converted to the North American Datum of 1983 and the North American Vertical Datum of 1988 (using the GEOID03 model). The files are in the Quarter-Quad tiling format and the exact tile location is contained in the file name at ########_fs, where ####### is the Quarter-Quad tile ID.The development of custom software for creating these data products has been supported by the USGS CMG Program's Decision Support for Coastal Parks, Sanctuaries, and Preserves Project. Processed data products are used by the USGS CMG Program's National Assessments of Coastal Change Hazards Project to quantify the vulnerability of shorelines to coastal change hazards such as severe storms, sea-level rise, and shoreline erosion and retreat.
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ground condition
None planned
-88.375
-87.5
30.375
30.125
USGS Metadata Identifier
USGS:d19be048-aef2-479d-ba12-a6110d2a6b7c
http://remotesensing.usgs.gov
Airborne Lidar Processing System
ALPS
DEM
Digital Elevation Model
ATM
Airborne Topographic Mapper
laser altimetry
Lidar
remote sensing
topography
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
http://nationalmap.gov
Alabama
Northern Gulf of Mexico
http://lidar.cr.usgs.gov/
First Surface
http://www.esri.com/news/arcuser/1104/temporal.html
2001
None
The U.S. Geological Survey and National Aeronautics and Space Administration request to be acknowledged as originators of the dataset in future products or derivative research.
Amar Nayegandhi
Jacobs Technology, U.S. Geological Survey, FISC, St. Petersburg, FL
Computer Scientist
mailing and physical address
600 4th Street South
Saint Petersburg
FL
33701
USA
727-803-8747 (x3026)
anayegandhi@usgs.gov
jbrock@usgs.gov
M-F, 8:00-5:00 EST
http://pubs.usgs.gov/ds/418/html/images/ALAB_Mosaic.jpg
ATM Coastal Topography–Alabama 2001, Mosaic: 1-m Resolution
JPG
Acknowledgment of the U.S. Geological Survey, Florida Integrated Science Center as a data source would be appreciated in products developed from these data, and such acknowledgment as is standard for citation and legal practices for data source is expected. Sharing of 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 datasets for the same area from other time periods may be inaccurate due to inconsistencies resulting from changes in photointerpretation, mapping conventions, and digital processes over time. These data are not legal documents and are not to be used as such.
Unclassified
Unclassified
None
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcMap 9.2.2.1350
The expected accuracy of the measured variables is as follows: attitude within 0.07 degree, 3 cm nominal laser ranging accuracy, and vertical elevation accuracy of +/-15 cm for the topographic surface. Quality checks are built into the data-processing software.
The files are in the Quarter-Quad tiling format and the exact tile location is contained in the file name at ########_fs, where ####### is the Quarter-Quad tile ID.See DOQQ_naming_convention.doc in the 'extras' directory.
Several regions of the dataset are labeled as "No Data", which corresponds to a cell value of -32767 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.
Elevations of the DEM are vertically consistent with the point elevation data, +/-15 cm.
The data are collected using a twin-otter aircraft. The NASA Airborne Topographic Mapper (ATM) laser scanner collects the data using a green raster scanning laser. The data are stored on hard drives and archived at the U.S. Geological Survey's FISC office in St. Petersburg, FL, and the NASA office at Wallops Flight Facility in Virginia. The navigational data are processed at Wallops Flight Facility. The navigational and raw data are then downloaded into the Advanced 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).
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Amar Nayegandhi
Jacobs Technology, U.S. Geological Survey, FISC, St. Petersburg, FL
Computer Scientist
mailing and physical address
600 4th Street South
Saint Petersburg
FL
33701
USA
727-803-8747 (x3026)
anayegandhi@usgs.gov
M-F, 8:00-5:00 EST
Metadata imported into ArcCatalog from XML file.
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Xan Yates
Jacobs Technology, U.S. Geological Survey, FISC, St. Petersburg, FL
Metadata Specialist
mailing and physical address
600 4th Street South
Saint Petersburg
FL
33701
USA
727-803-8747 (x3086)
M-F, 8:00-5:00 EST
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
Quater-Quadrangle
Raster
Pixel
Universal Transverse Mercator
16
0.999600
-87.000000
0.000000
500000.000000
0.000000
row and column
2.000000
2.000000
meters
North American Datum of 1983
Geodetic Reference System 80
6378137.000000
298.257222
North American Vertical Datum of 1988
0.15 m
meters
Explicit elevation coordinate included with horizontal coordinates
This Digital Elevation Model is a GeoTIFF. It is raster data consisting of cells. Each cell has an elevation value associated with it.
The variables measured by ATM are distance between aircraft and GPS satellites (m), attitude information (roll, pitch, heading in degrees), scan angle (degrees), second of the epoch (sec), and 1ns time-resolved return intensity waveform (digital counts). Z value is referenced to orthometric elevations derived from National Geodetic Survey Geoid Model, GEOID03.
U.S. Geological Survey
Project Manager
Project Manager
mailing address
600 4th Street South
Saint Petersburg
FL
33701
USA
727-803-8747
M-F, 8:00-5:00 EST
DS 418
This DVD publication was prepared by an agency of the United States Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
TIFF
2
GeoTIFF
http://pubs.usgs.gov/ds/418/data_files/fs/
Data can be downloaded via the World Wide Web (WWW)
DVD
DVD
Vary
Contact U.S. Geological Survey
Vary
Contact U.S. Geological Survey for details.
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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