55976 usace2007_niagara_dem_m8705_metadata Data Set Published / External 49404 DEMs - partner (no harvest) Project Completed These files contain rasterized topographic lidar elevations generated from returns classified as ground (2). These data were collected by the Compact Hydrographic Airborne Rapid Total Survey (CHARTS) system along the coast of New York. CHARTS integrates topographic and bathymetric lidar sensors, a digital camera and a hyperspectral scanner on a single remote sensing platform for use in coastal mapping and charting activities. Data coverage generally extends along the coastline from the waterline inland 500 meters (topography) and offshore 1,000 meters or to laser extinction (bathymetry). Native lidar data is not generally in a format accessible to most Geographical Information Systems (GIS). Specialized in-house and commercial software processes the native lidar data into 3-dimensional positions that can be imported into GIS software for visualization and further analysis. Horizontal positions, provided in decimal degrees of latitude and longitude, are referenced to the North American Datum of 1983 (NAD83). Vertical positions are referenced to the NAD83 ellipsoid and provided in meters. The National Geodetic Survey's (NGS) GEOID03 model is used to transform the vertical positions from ellipsoid to orthometric heights referenced to the North American Vertical Datum of 1988 (NAVD88). Once converted to orthometric heights, the data were then converted to IGLD85 using the VDatum program from NOAA (National Oceanic and Atmospheric Administration). The 3-D position data are used to generate a series of gridded file products, with each covering approximately 5 kilometers of shoreline. In addition to these bare earth Digital Elevation Model (DEM) data, the lidar point data that these DEM data were created from are also available. These data are available for custom download at the link provided in the URL section of this metadata record. DEMs at a 1 meter grid spacing, created from all classes, are available by contacting the NOAA Office for Coastal Management (OCM) via email at coastal.info@noaa.gov. These data were collected as a part of the NCMP to depict the elevations above the water in the New York coastal zone. Theme Global Change Master Directory (GCMD) Data Center Keywords DOD/USARMY/USACE/SAD/MOBILE > Mobile District, South Atlantic Division, U.S. Army Corps of Engineers, U.S. Army, U.S. Department of Defense Theme Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > LAND SURFACE > LAND USE/LAND COVER Theme Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION Theme Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION Theme ISO 19115 Topic Category elevation Theme ISO 19115 Topic Category oceans Spatial Global Change Master Directory (GCMD) Location Keywords CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NEW YORK Spatial Global Change Master Directory (GCMD) Location Keywords VERTICAL LOCATION > LAND SURFACE Spatial Global Change Master Directory (GCMD) Location Keywords VERTICAL LOCATION > SEA FLOOR Instrument Global Change Master Directory (GCMD) Instrument Keywords LIDAR > Light Detection and Ranging Platform Global Change Master Directory (GCMD) Platform Keywords Airplane > Airplane Platform Global Change Master Directory (GCMD) Platform Keywords DEM > Digital Elevation Model Theme CHARTS Theme DEM Theme JALBTCX Theme SHOALS Theme beach Theme erosion Theme river Spatial Geographic Names Information System Erie County Spatial Geographic Names Information System Kenmore Spatial Geographic Names Information System New York Spatial Geographic Names Information System Niagara County Spatial Geographic Names Information System Niagara Falls Spatial Geographic Names Information System North Tonawanda Spatial Geographic Names Information System Tonawanda Spatial Geographic Names Information System United States Office for Coastal Management Charleston SC Data Set Elevation As Needed Model (digital) Any conclusions drawn from the analysis of this information are not the responsibility of USACE, JALBTCX, NOAA, the Office for Coastal Management or its partners. JALBTCX (Joint Airborne Lidar Bathymetry Technical Center of eXpertise) Data Steward 2019 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Distributor 2019 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Metadata Contact 2019 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Point of Contact 2019 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Ground Condition -79.2696829 -78.6819778 43.2404139 42.8619918 Range 2007-07-21 2007-08-08 Unclassified Data is available online for bulk downloads. None 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 its limitations. https://noaa-nos-coastal-lidar-pds.s3.us-east-1.amazonaws.com/dem/USACE_NY_Niagara_DEM_2007_8705/index.html 2019 Organization NOAA Office for Coastal Management Bulk Download Bulk download of data files. https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8704/supplemental/ny2007_niagara_m8704.kmz Browse graphic Browse Graphic KML This graphic displays the footprint for this lidar data set. https://coast.noaa.gov/ NOAA's Office for Coastal Management (OCM) website Online Resource HTML Information on the NOAA Office for Coastal Management (OCM) https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8704 Online Resource Link to custom download the lidar point data from which these raster Digital Elevation Model (DEM) data were created. Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog 9.3.1.1850 The data positions were obtained using post processed KGPS methods. The horizontal accuracy of the data is better than +/- 0.75 m at 1 Sigma. The data positions were obtained using post processed KGPS methods. The vertical accuracy of the data is better than +/- 0.20 m at 1 Sigma. The data provided in this file were tested against ground truth data. At these locations the lidar data matched within 0.20 meters, and different flight line data agreed within 0.20 meters. 1 These data were collected using the CHARTS system. It is owned by the Naval Oceanographic Office and operated through contract. The system collects topographic lidar data at 9kHz, bathymetric lidar data at 1kHz and RGB imagery at 1Hz. A CASI-1500 hyperspectral line scanner is integrated with the system as well. Aircraft position, velocity and acceleration information are collected through a combination of Novatel and POS A/V 410 equipment. All raw data streams are transferred to the office for downloading and processing in SHOALS GCS software. Aircraft position data are processed using POSPac software and the results are combined with the lidar data to produce 3-D positions for each lidar shot. Upon inspection and QA/QC in the software packages Fledermaus and PFM_ABE, anomalous data are flagged as invalid. PFM_ABE's chartsLAS module then converts all valid data from ellipsoid to orthometric heights based on the NGS' GEOID03 model and exports topographic data as a series of LAS files with a single file per flightline per 5km box. Once converted to orthometric heights, the data were then converted to IGLD85 using the VDatum program from NOAA (National Oceanic and Atmospheric Administration). 2 The flightline LAS files are imported into the TerraScan V10 module within MicroStation V8.0. The resulting LAS files are thinned to eliminate duplicate points. A customized classification macro is used to distinguish ground points (2) and unclassified points (1). The classification results are QC'd and any misclassified points are manually edited. In areas of dense vegetation the bare ground points might be incorrectly classified due to the inability of the laser to penetrate the canopy and reach the bare ground. In these areas, JALBTCX defaults to the algorithm's "ground" surface instead of manually reclassifying those points. The points are exported to an ASCII file containing the following fields: longitude, latitude, elevation (orthometric), intensity, classification, mirror angle, time (GPS time), number of echos, and echo number. The ASCII file is converted to LAS with the txt2las code from LAStools (http://www.cs.unc.edu/~isenburg/lastools/). 3 The points classified as ground in the Classified LAS files are converted to a grid by generating a Triangulated Irregular Network (TIN) and then extracting the grid node elevations from the TIN surface. The origin point of the grid is located at a horizontal position whose value is evenly divisible by the 1m grid resolution such that rasters from subsequent surveys have common cell boundaries. JALBTCX uses Quick Terrain Modeler V7.0.3 to perform this operation utilizing the following key parameters; "Max Sample Excursion 50," "Max Triangle Side 100," and "Smoothing filter Level 4 with a Max Roughness 2." The grid is exported as an ESRI ASCII Z grid formatted file, which is converted to a raster within ESRI ArcMap <V9.3> using the ASCIIToRaster command within ArcToolbox. The resulting raster output is in TIFF format. The projection is defined as "The North American Datum of 1988" using the DefineProjection command within ArcToolbox. 4 The NOAA Office for Coastal Management (OCM) received 13 tif files from USACE JALBTCX. The bare earth raster files were at a 1 m grid spacing. The data were in geographic coordinates and IGLD85 elevations in meters. OCM assigned the EPSG codes of 4269 and 5609 to the files using gdal_translate. OCM copied the raster files to https for Digital Coast storage and provisioning purposes. 2019-03-29T00:00:00 Organization Office for Coastal Management OCM https://ror.org/05v14bq57 2234 South Hobson Avenue Charleston SC 29405-2413 https://www.coast.noaa.gov/ gov.noaa.nmfs.inport:55976 Rebecca Mataosky 2019-03-29T14:43:37 SysAdmin InPortAdmin 2026-03-04T19:17:17 2024-01-10 OCM Partners OCMP 1002 Public No No 2022-03-16 1 Year 2023-03-16