n88_30087b7c_mf_be.xyzn88_30087b7c_mf_be.xyzAscii xyz point cloud data were produced from remotely-sensed, geographically-referenced elevation measurements in cooperation with the U.S. Geological Survey (USGS) and National Air and Space Administration (NASA). Elevation measurements were collected over the area using the NASA Experimental Advanced Airborne Research Lidar (EAARL), a pulsed laser ranging system mounted onboard an aircraft to measure ground elevation, vegetation canopy, and coastal 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 target area at approximately 50 meters per second at an elevation of approximately 300 m. The EAARL, developed by NASA 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 of coastline can be easily surveyed within a 3- to 4-hour mission time period. When subsequent elevation maps for an area are analyzed, they provide a useful tool to make management decisions regarding land development.The ASCII elevation data can be used to create raster Digital Elevation Models. The purpose of this project is to produce highly detailed and accurate bare earth digital elevation map of the post hurricane Ivan data for use as a management tool and to make this map available to natural resource managers and research scientists.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 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. Specialized processing algorithms are used to convert raw waveform lidar data acquired by the EAARL to georeferenced spot (x,y,z) returns for "first return" and "bald earth" topography. These data are then converted to the North American Datum of 1983 and the North American Vertical Datum of 1988 (using the Geoid 03 model). The files are in the Quarter Quad tiling format and the exact tile location is contained in the filename at n88_########_mf_be where ####### is the Quarter Quad tile ID.enSeptember 19, 2004ground conditionNone planned55.0-5.0metersLIDARExperimental Advanced Airborne Research LidarEAARLDigital Elevation Modelelevation changelaser altimetryderived surfaceresource managementbare earth elevationALPSAdvanced Lidar Processing SystemHurricanesIvanFloridaLouisianaAny 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 this data for any given purpose. The user assumes the entire risk related to the use of these data.Dr. John C. BrockUnited States Geological Survey, Florida Integrated Science CenterResearch Oceanographermailing and physical address
600 4th Street South
Saint PetersburgFL33701USA727 803-8747 ext3088727 803-2031jbrock@usgs.govMonday-Friday, 8-5, ESTAmar NayegandhiETI Professionals, Inc., contracted to United States Geological Survey, Florida Integrated Science CenterComputer Scientistmailing and physical address
600 4th Street South
Saint PetersburgFL33701USA727 803-8747 ext3026727 803-2031anayegandhi@usgs.govMonday-Friday, 8-5, ESTUSGS 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 Florida Integrated Science Center 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.Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350Filtered fileThe expected accuracy of the measured variables are 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.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.20040919ground conditionThe 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 FISC 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 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).May 2006 - December 2007Advanced Lidar Processing SystemMetadata imported.20071205Metadata imported.C:\DOCUME~1\JLEBON~1\LOCALS~1\Temp\xml9AE6.tmp20080102PointPointrow and column1.000001.00000metersNorth American Datum of 1983Geodetic Reference System 806378137.000000298.257222GCS_North_American_1983NAD_1983_UTM_Zone_16NNorth American Vertical Datum of 19880.15 mmetersExplicit elevation coordinate included with horizontal coordinatesThe 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). Z value is referenced to orthometric elevations derived from National Geodetic Survey Geoid Model, Geoid03.The attributes of the dataset are as follows: " UTMeasting UTMnorthing elevation"Jim LebonitteJacobs Technologies Inc. Contracted to United States Geological SurveyResearch Internmailing address
600 4th Street South
Saint PetersburgFL33701USA727 803-8747 ext3129jlebonitte@usgs.govM-F: 9:00AM - 5:00PM, ESTLidar Point Cloud (ascii xyz)The United States Geological Survey 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 United States Geological Survey 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 United States Geological Survey, 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.Contact USGS for DetailsCall USGS for Details20080102USGS Florida Integrated Science CenterEmily KlippAdministrative Assistantmailing address
600 4th Street South
Saint PetersburgFL33701USA727-803-8747 ext3089eklipp@usgs.govFGDC Content Standards for Digital Geospatial MetadataFGDC-STD-001-1998local timeenhttp://www.esri.com/metadata/esriprof80.htmlESRI Metadata ProfileMicrosoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350n88_30087b7c_mf_be.xyz002Filtered file20080102200801021033020020080102FALSE1033020010330200{93E28884-F081-40DA-9E89-315C6D6CEE40}20080102datasetISO 19115 Geographic Information - MetadataDIS_ESRI1.0