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<attribute type="string" name="fgdc_id" value="gov.noaa.csc.maps:alace_1998_ma"/>
<attribute type="string" name="fgdc_title" value="1996-2000 NOAA/USGS/NASA Airborne LiDAR Assessment of Coastal Erosion (ALACE) Project for the US Coastline"/>
<attribute type="string" name="fgdc_summary" value="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."/>
<attribute type="string" name="fgdc_keywords" value="Elevation, lidar, laser, beach, Bathymetry/Topography, digital elevation model, DEM, erosion"/>
<attribute type="string" name="fgdc_keywords_vocabulary" value="ISO 19115 Topic Category, None"/>
<attribute type="string" name="fgdc_comment" value="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 microjoules 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."/>
<attribute type="string" name="fgdc_creator_name" value=""/>
<attribute type="string" name="fgdc_creator_email" value="tcm@csc.noaa.gov"/>
<attribute type="string" name="fgdc_institution" value="Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC)"/>
<attribute type="string" name="fgdc_license" value="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 it's limitations., 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 it's partners."/>
<attribute type="string" name="fgdc_publisher_name" value="Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC)"/>
<attribute type="string" name="fgdc_publisher_email" value="tcm@csc.noaa.govkelly.stroker@noaa.gov"/>
<attribute type="string" name="fgdc_metadata_contact" value="Keil Schmid, NOAA Coastal Services Center"/>
<attribute type="string" name="fgdc_update_frequency" value="None planned"/>
<attribute type="string" name="fgdc_progress" value="Complete"/>
<attribute type="string" name="metadata_conventions" value="Content Standard for Digital Geospatial Metadata: Extensions for Remote Sensing Metadata"/>
<attribute type="string" name="fgdc_metadata_url" value="http://www.ngdc.noaa.gov/nmmrview/fgdc.jsp?id=gov.noaa.csc.maps:alace_1998_ma&amp;view=xml&amp;responseType=text/plain"/>
<attribute type="int" name="fgdc_date_created" value="Unknown"/>
<attribute type="int" name="fgdc_date_issued" value="Unknown"/>
<attribute type="float" name="fgdc_geospatial_lat_min" value="25.633621"/>
<attribute type="float" name="fgdc_geospatial_lat_max" value="47.885630"/>
<attribute type="float" name="fgdc_geospatial_lon_min" value="-69.692954"/>
<attribute type="float" name="fgdc_geospatial_lon_max" value="-124.621351"/>
<attribute type="int" name="fgdc_time_coverage_start" value="19961009"/>
<attribute type="int" name="fgdc_time_coverage_end" value="20001102"/>
</netcdf>







