gov.noaa.nmfs.inport:80455 eng UTF8 dataset Elevation Office for Coastal Management resourceProvider NOAA Office for Coastal Management (843) 740-1202 2234 South Hobson Ave Charleston SC 29405-2413 coastal.info@noaa.gov https://coast.noaa.gov WWW:LINK-1.0-http--link NOAA Office for Coastal Management Website NOAA Office for Coastal Management Home Page information pointOfContact 2026-10-02T13:59:08 ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data ISO 19115-2:2009(E) EPSG::6441 EPSG::6360 2025 Apalachicola Riverkeeper Lidar DEM: Apalachicola River, FL fl2025_apa_river_dem_m15672 2025 creation 2026 publication NOAA/NMFS/EDM 80455 https://www.fisheries.noaa.gov/inport/item/80455 WWW:LINK-1.0-http--link Full Metadata Record View the complete metadata record on InPort for more information about this dataset. information https://coast.noaa.gov/ WWW:LINK-1.0-http--link NOAA's Office for Coastal Management (OCM) website Information on the NOAA Office for Coastal Management (OCM) download https://coast.noaa.gov/dataviewer/ WWW:LINK-1.0-http--link NOAA's Office for Coastal Management (OCM) Data Access Viewer (DAV) The Data Access Viewer (DAV) allows a user to search for and download elevation, imagery, and land cover data for the coastal U.S. and its territories. The data, hosted by the NOAA Office for Coastal Management, can be customized and requested for free download through a checkout interface. An email provides a link to the customized data, while the original data set is available through a link within the viewer. download Product: Hydroflattened Digital Elevation Model (DEM) data covering the Apalachicola River Slough Restoration - Lidar Survey project area. Geographic Extent: This dataset and derived products encompass an area covering approximately 107,873 acres of Apalachicola Region in Northwest Florida. Dataset Description: Lidar flight line swaths were processed to create 855 classified LAS 1.4 files delineated in 3000ft x 3000ft tiles. Each LAS file contains lidar point information, which has been calibrated, controlled, and classified. The data were developed based on a horizontal projection/datum of Florida State Plane North, NAD83 (2011), U.S. Feet and vertical datum of NAVD88 GEOID18, U.S. Feet. Class 2 (ground) lidar points in conjunction with the hydro breaklines were used to create 685 1.5 U.S. Survey foot hydro-flattened Raster DEMs delineated in 3000ft x 3000ft tiles. Non-Vegetated Vertical Accuracy (NVA) was assessed using 49 check points located on bare earth in clear, unobstructed areas. Additional products include classified LAS files, intensity images, highest hit surface models, Normalized Digital Surface Model (nDSM), and 3D breaklines of waterbodies within the study area. Ground Conditions: Acquisition occurred during the first suitable fall window with low flow and minimal leaf cover. Apalachicola Riverkeeper provided this data to the NOAA Office for Coastal Management (OCM) for the purpose of making the data publicly available for bulk and custom downloads from the NOAA Digital Coast Data Access Viewer. The purpose of the lidar data was to produce a high accuracy 3D dataset that meets all necessary standards laid out in the Apalachicola River Slough Restoration - Lidar Survey contract. The lidar point cloud data were used to create classified LAS files, intensity images, hydro-flattened DEMs, highest hit surface models, Normalized Digital Surface Model (nDSM), and 3D breaklines of waterbodies within the study area. Apalachicola Riverkeeper, NV5 completed NOAA Office for Coastal Management (843) 740-1202 2234 South Hobson Ave Charleston SC 29405-2413 coastal.info@noaa.gov https://coast.noaa.gov WWW:LINK-1.0-http--link NOAA Office for Coastal Management Website NOAA Office for Coastal Management Home Page information pointOfContact NOAA Office for Coastal Management (843) 740-1202 2234 South Hobson Ave Charleston SC 29405-2413 coastal.info@noaa.gov https://coast.noaa.gov WWW:LINK-1.0-http--link NOAA Office for Coastal Management Website NOAA Office for Coastal Management Home Page information custodian notPlanned EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > DIGITAL ELEVATION/TERRAIN MODEL (DEM) EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION theme Global Change Master Directory (GCMD) Science Keywords 23.3 CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > FLORIDA VERTICAL LOCATION > LAND SURFACE place Global Change Master Directory (GCMD) Location Keywords 23.3 LIDAR > Light Detection and Ranging instrument Global Change Master Directory (GCMD) Instrument Keywords 23.3 Airplane > Airplane platform Global Change Master Directory (GCMD) Platform Keywords 23.3 DOC/NOAA/NOS/OCM > Office of Coastal Management, National Ocean Service, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2017-04-24 publication 8.5 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2026. GCMD Keywords, Version 24. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian DEMs project InPort otherRestrictions Cite As: Office for Coastal Management, [Date of Access]: 2025 Apalachicola Riverkeeper Lidar DEM: Apalachicola River, FL [Data Date Range], https://www.fisheries.noaa.gov/inport/item/80455. NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose. license To the extent possible under law, the U.S. Government has waived all copyright and related or neighboring rights to this dataset. otherRestrictions Access Constraints: None otherRestrictions Use Constraints: 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. otherRestrictions Distribution Liability: Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners. unclassified grid 1.5 eng; US elevation -85.197771 -84.847282 29.938523 30.714073 | Currentness: Ground Condition 2025-10-23 Raster File Type = TIFF Bit Depth/Pixel Type = 32-bit float Raster Cell Size = 1.5 U.S. Survey feet Interpolation or Resampling Technique = Triangulated Irregular Network Zip GeoTIFF NOAA Office for Coastal Management (843) 740-1202 2234 South Hobson Ave Charleston SC 29405-2413 coastal.info@noaa.gov https://coast.noaa.gov WWW:LINK-1.0-http--link NOAA Office for Coastal Management Website NOAA Office for Coastal Management Home Page information distributor https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=15672/details/15672 WWW:LINK-1.0-http--link Customized Download Create custom data files by choosing data area, map projection, file format, etc. A new metadata will be produced to reflect your request using this record as a base. download https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/dem/FL_Apalachicola_River_2025_15672/index.html WWW:LINK-1.0-http--link Bulk Download Bulk download of data files in the original coordinate system. download dataset Horizontal Positional Accuracy Lidar horizontal accuracy is a function of Global Navigation Satellite System (GNSS) derived positional error, flying altitude, and INS derived attitude error. The obtained RMSEr value is multiplied by a conversion factor of 1.7308 to yield the horizontal component of the National Standards for Spatial Data Accuracy (NSSDA) reporting standard where a theoretical point will fall within the obtained radius 95 percent of the time. Based on a flying altitude of 1676 meters, an IMU error of 0.001 decimal degrees, and a GNSS positional error of 0.019 meters, this project was produced to meet a 0.056 m (0.183 ft) RMSEH or 0.096 m (0.316 ft) at the 95% confidence level. Vertical Positional Accuracy This data set was produced to meet ASPRS Positional Accuracy Standard for Digital Geospatial Data (Edition 2) Vertical Accuracy. The specifications require the Non-vegetated Vertical Accuracy (NVA) be computed from the derived DEMs. The NVA was tested with 49 independent check points located in open terrain and distributed throughout the project as feasible. These check points were not used in the calibration or post processing of the lidar point cloud data. Specifications for this project require that the NVA be 0.10m or better RMSEv. The 49 independent NVA check points were surveyed using real time kinematics. Elevations interpolated from the derived DEMs were compared to the elevation values of the surveyed NVA check points. The RMSEv was computed to be 0.021 meters. Completeness Report A visual qualitative assessment was performed to ensure data completeness. No void areas or missing data exist. The classified point cloud is of good quality and data passes Non-Vegetated Vertical Accuracy specifications. Conceptual Consistency DEM files were tested by NV5 for vertical accuracy. All data is seamless from one tile to the next and no gaps exist. The NOAA Office for Coastal Management (OCM) received the GeoTIFF files from Apalachicola Riverkeeper. Lidar Pre-Processing: 1. Review flight lines and data to ensure complete coverage of the study area and positional accuracy of the laser points. 2. Resolve kinematic corrections for aircraft position data using kinematic aircraft GPS and static ground GPS data. 3. Develop a smoothed best estimate of trajectory (SBET) file that blends post-processed aircraft position with sensor head position and attitude recorded throughout the survey. 4. Calculate laser point position by associating SBET position to each laser point return time, scan angle, intensity, etc. Create raw laser point cloud data for the entire survey in *.las format. Convert data to orthometric elevations by applying a GEOID18 correction. 5. Import raw laser points into manageable blocks to perform manual relative accuracy calibration and filter erroneous points. Classify ground points for individual flight lines. 6. Using ground classified points per each flight line, test the relative accuracy. Perform automated line-to-line calibrations for system attitude parameters (pitch, roll, heading), mirror flex (scale) and GPS/IMU drift. Calculate calibrations on ground classified points from paired flight lines and apply results to all points in a flight line. Use every flight line for relative accuracy calibration. 7. Adjust the point cloud by comparing ground classified points to supplemental ground control points. 2025-12-09T00:00:00 Lidar Post-Processing: 1. Classify data to ground and other client designated classifications using proprietary classification algorithms. 2. Manually QC data classification. 3. Calculate final NVA vertical accuracy statistics and calculate native and ground density information. 2025-12-09T00:00:00 Hydro-flattening Breaklines and Hydro-flattened DEM creation: Water boundary polygons were developed using an algorithm which weights lidar-derived slopes, intensities, and return densities to detect the water's edge. The water's edge was then manually reviewed and edited as necessary. Elevations were assigned to the water’s edge through neighborhood statistics identifying the lowest lidar return from the water surface. Lakes were assigned a consistent elevation for an entire polygon while rivers were assigned consistent elevations on opposing banks and smoothed to ensure downstream flow through the entire river channel. These breaklines were incorporated into the hydro-flattened DEM by enforcing triangle edges (adjacent to the breakline) to the elevation values derived from the breakline. This implementation corrected interpolation along the hard edge. Breaklines were also used to classify all ground points within the identified water bodies to class 9 (water). 2025-12-09T00:00:00 The NOAA Office for Coastal Management (OCM) received 685 GeoTIFF files from Apalachicola Riverkeeper. The files were in FL State Plane North NAD83 (2011) US feet coordinates and the elevations were in NAVD88 (GEOID18) US feet. The raster files were at a 1.5 feet grid spacing. The GeoTIFF files were copied to NOAA OCM resources and made available for bulk and custom downloads from the NOAA Digital Coast Data Access Viewer (DAV). 2026-10-02T00:00:00 NOAA Office for Coastal Management (843) 740-1202 coastal.info@noaa.gov processor Apalachicola Riverkeeper GeoTIFF Files Apalachicola Riverkeeper https://apalachicolariverkeeper.org/ WWW:LINK-1.0-http--link Apalachicola Riverkeeper Source Citation URL information originator Riegl VQ-1560ii Lidar Sensor The Dual LIDAR Waveform Processing Airborne Scanning System VQ-1560ii provides further increased performance and highest productivity based on a laser pulse repetition rate of up to 4 MHz, resulting in more than 2.66 million measurements per second on the ground.