ATM Coastal Topography--Alabama 2001 U.S. Geological Survey Data Series 418 By Amar Nayegandhi(1), Xan Yates(1), John C. Brock(2), A.H. Sallenger(3), Jamie M. Bonisteel(1), Emily S. Klipp(1), and C. Wayne Wright(3) (1)Jacobs Technology Inc., St. Petersburg, FL (2)U.S. Geological Survey, Coastal and Marine Geology Program, Reston, VA (3)U.S. Geological Survey, Florida Integrated Science Center, St. Petersburg, FL README CONTENTS Disclaimer System Requirements Project Summary DVD Organization Getting Started Contact Selected References DISCLAIMER This DVD publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof nor any employee makes any warranty expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report or represents that its use would not infringe privately owned rights. 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. Although all data and software published on this DVD have been used by the U.S. Geological Survey, no warranty, expressed or implied, is made by the U.S. Geological Survey as to the accuracy of the data and related materials and (or) the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data, software, or related materials. SYSTEM REQUIREMENTS This DVD can be successfully accessed on computer systems utilizing the following operating systems: Microsoft Windows, Macintosh, and UNIX. PROJECT SUMMARY These remotely sensed, geographically referenced elevation measurements of Lidar-derived first surface topography were produced collaboratively by the U.S. Geological Survey (USGS), FISC, St. Petersburg, FL, and the National Aeronautics and Space Administration (NASA), Wallops Flight Facility, VA. Applications of high-resolution topography include (but are not limited to): habitat mapping, ecological monitoring, change detection, and event assessment. This project provides highly detailed and accurate datasets of the Alabama coastline, acquired October 3-4, 2001. The datasets are made available for use as a management tool to research scientists and natural resource managers. An innovative scanning Lidar instrument originally developed by NASA, and known as the Airborne Topographic Mapper (ATM), was used during data acquisition. The ATM system is a scanning Lidar system that measures high-resolution topography of the land surface 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 +/-15 centimeters. The nominal ATM platform is a Twin Otter or P-3 Orion aircraft, but the instrument may be deployed on a range of light aircraft. DVD ORGANIZATION There are three top-level files and four top-level directories contained on this DVD. The top-level files are: 1.) index.html - This file is intended to be the starting point for DVD access. It is written in the Hypertext Markup Language utilized by the World Wide Web (WWW) project and must be opened with a WWW browser. Once opened, the user may browse the DVD's contents as one would browse pages from the WWW. 2.) readme.txt - This file. 3.) autorun.inf - This file is used by Windows systems and indicates which file to open and how to treat the contents of the DVD. The top-level directories are: 1.) Directory html/ - This directory contains the HTML files and supporting graphics to allow the user access to the DVD via any World Wide Web browser. This directory includes the following subdirectories: tile_htmls - contains the HTML page used for each tile's images and links. styles/ - contains style sheets used in the formatting of the HTML pages. images/ - contains images used in the formatting of the HTML pages and contains one subdirectory: jpeg_tiles/ - contains the map tile images used on each tile's HTML page. 2.) Directory data_files/ - This directory contains one subdirectory: fs/ - contains the data GeoTiffs, .xyz, and .las files, as well as their corresponding metadata files, for the first surface data organized into subdirectories listed by their DOQQ position as follows: 30087b6b/ 3.) Directory metadata/ - This directory contains a general metadata file in .xml and .txt formats to act as a general reference. 4.) Directory extras/ - This directory contains the DOQQ naming convention document, which is referenced on the Purpose page. This directory contains one subdirectory: mosaic/ - contains the 1-m resolution mosaic GeoTiff, as well as the corresponding metadata file. GETTING STARTED If the HTML file does not open automatically, open the 'index.html' file, located at the top-level directory on this DVD, either by double-clicking on it or by opening it directly from your browser menu. CONTACT Amar Nayegandhi Jacobs Technology Inc. U.S. Geological Survey 600 4th Street South St. Petersburg, FL 33701 Ph: (727) 803-8747 x3026 FAX: (727) 803-2032 anayegandhi@usgs.gov SELECTED REFERENCES Brock, J.C., Wright, C.W., Sallenger, A.H., Krabill, W.B., and Swift, R.N., 2002, Basis and methods of NASA airborne topographic mapper Lidar surveys for coastal studies: Journal of Coastal Research, v. 18, no. 1, p. 1-13. Crane, Michael, Clayton, Tonya, Raabe, Ellen, Stoker, Jason, Handley, Larry, Bawden, Gerald, Morgan, Karen, and Queija, Vivian, 2004, Report of the U.S. Geological Survey Lidar workshop sponsored by the Land Remote Sensing Program and held in St. Petersburg, FL, November 2002: U.S. Geological Survey Open-File Report 2004-1456, 72 p. Nayegandhi, A., Brock, J.C., and Wright, C.W., in press, Small-footprint, waveform-resolving Lidar estimation of submerged and sub-canopy topography in coastal environments: International Journal of Remote Sensing. Sallenger, A.H., Wright, C.W., and Lillycrop, J., 2005, Coastal impacts of the 2004 hurricanes measured with airborne Lidar; initial results: Shore and Beach, v. 73 nos. 2-3, p. 10-14.