gov.noaa.nmfs.inport:52496 eng UTF8 dataset Elevation OCM Partners 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 2026-03-04T19:17:17 ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data ISO 19115-2:2009(E) 2014 FEMA Lidar DEM: Ketchikan, Alaska 2014 Ketchikan, Alaska 2014-11-30 publication NOAA/NMFS/EDM 52496 https://www.fisheries.noaa.gov/inport/item/52496 WWW:LINK-1.0-http--link Full Metadata Record View the complete metadata record on InPort for more information about this dataset. information https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8521/supplemental/02130C_Ketchikan_FEMA_M-11_Certificate_of_Compliance.pdf WWW:LINK-1.0-http--link Certificate of compliance FEMA certificate of compliance download 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://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8521/supplemental/02130C_Elevation_Data_QA_Report_for_Ketchikan_Alaska.pdf WWW:LINK-1.0-http--link Dataset report Link to data set QA report. 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 Digital Elevation model, derived from a lidar point cloud data, developed to support FEMA flood risk analysis and mapping in Ketchikan, Alaska. Point cloud is classified as ground (class 2) and other (class 1). The data was collected under a FEMA contract to the Strategic Alliance for Risk Reduction (STARR) with an accuracy requirement to support 2-foot contours. Original tasking indicates additional classes would be populated (7, 9, 10, 11), but they are not in the data set. Terrain data are used to represent the topography of a watershed and/or floodplain environment and to extract useful information for hydraulic and hydrologic models. (Source: FEMA Guidelines and Standards for Flood Risk Analysis and Mapping.) Federal Emergency Management Agency 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 unknown https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8521/supplemental/ketchikan_extent_2014_m8521.kmz This graphic displays the footprint for this lidar data set. KML EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION theme Global Change Master Directory (GCMD) Science Keywords 17.0 CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALASKA VERTICAL LOCATION > LAND SURFACE place Global Change Master Directory (GCMD) Location Keywords 20.8 LIDAR > Light Detection and Ranging instrument Global Change Master Directory (GCMD) Instrument Keywords 17.2 Airplane > Airplane platform Global Change Master Directory (GCMD) Platform Keywords 17.2 Bare Earth Breaklines Contours DEM Digital Elevation Model Elevation Data Flow Vectors Hydro Enforced DEM LIDAR Land Surface Relief Slope TIN Topography Triangulated Irregular Network theme FEMA NFIP Topic Category DEMs - partner (no harvest) project InPort otherRestrictions Cite As: OCM Partners, [Date of Access]: 2014 FEMA Lidar DEM: Ketchikan, Alaska [Data Date Range], https://www.fisheries.noaa.gov/inport/item/52496. 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. 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: No warranty expressed or implied is made by FEMA regarding the utility of the data on any other system nor shall the act of distribution constitute any such warranty. Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners unclassified 2014 FEMA Lidar: Ketchikan, Alaska NOAA/NMFS/EDM 52476 crossReference NOAA Data Management Plan (DMP) NOAA/NMFS/EDM 52496 https://www.fisheries.noaa.gov/inportserve/waf/noaa/nos/ocmp/dmp/pdf/52496.pdf WWW:LINK-1.0-http--link NOAA Data Management Plan (DMP) NOAA Data Management Plan for this record on InPort. information crossReference 3 eng; US elevation Original data development environment may vary. Finishing of the data is done using Esri’s ArcGIS software. The submitted file geodatabase was created using ArcGIS version 10.0. -131.890301 -131.454155 55.290125 55.517998 | Currentness: Ground Condition 2014-11-30 false eng false FEMA's Guidelines and Standards for Flood Risk Analysis and Mapping contains a detailed description of the data themes and references to other relevant information. 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=8522 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.us-east-1.amazonaws.com/dem/AK_Ketchikan_FEMA_DEM_2014_8522/index.html WWW:LINK-1.0-http--link Bulk Download Bulk download of data files in the original coordinate system in horizontal meters and feet. Vertical units are meters. download dataset Horizontal Positional Accuracy The LiDAR data horizontal accuracy is in compliance with the National Standard for Spatial Data Accuracy (NSSDA) RMSE estimation of elevation data in support of 2ft. contour mapping products as it is referenced in the FEMA Guidelines and Standards for Flood Risk Analysis and Mapping. Vertical Positional Accuracy Deliverables were tested by for both vertical and horizontal accuracy. The vertical unit of the data file is in meters with 2-decimal point precision. ASPRS, USGS, and FEMA vertical accuracy requirements were used to test lidar dataset. Fundamental Vertical Accuracy (FVA) tested against survey data points measured 0.0513 meters at 95% confidence and and RMSE of 0.0496 RMSE. The errors were not normally distributed. See the QA report for more details. Completeness Report The bare earth surface data is an estimation of the bare earth surface and does not include vegetative and built features. Likewise, it contains estimates of water edges at the time of data collection, and may not reflect current conditions. The bare earth surface will contain voids where insufficient energy was reflected from the surface to generate a valid return from the terrain. Voids in the bare earth surface tend to occur in heavily vegetated areas, water bodies, and beneath buildings, motor vehicles, bridges etc. Fresh or wet asphalt, wet sand and certain types of vegetation can also cause voids or anomalous elevations. The data may have been further processed to remove points found to be within delineated water bodies. Low confidence areas are delineated and provided in a separate dataset. Conceptual Consistency Checks were performed to ensure the data files can be opened, are georeferenced properly, and cover the geographic area completely. Additionally, field survey checkpoints are obtained to evaluate the accuracy of LiDAR products. A minimum of 100 checkpoints are tested in a project area. At least 20 for 5 different land vegetation categories (forest, built-up, scrub, weeds/crop, and bare-earth/low grass) are tested with forested areas requiring a minimum of 40 checkpoints. A statistical analysis between the difference in elevations of the field survey checkpoints and LiDAR-derived, bare earth elevations at the same locations provides a quality assessment of the LiDAR data. Terrain data used for flood risk analysis go through LiDAR preliminary processing and the unclassified point cloud data are tested as specified in the USGS National Geospatial Program Base LiDAR Specification Version 1.0. Where the Mapping Activity Statement (MAS) requires bare earth post-processing of the floodplain area of interest (AOI), the elevation data are tested and comply with both the Fundamental Vertical Accuracy (FVA) and Consolidated Vertical Accuracy (CVA) requirements. Where no bare earth post-processing is specified, only the FVA requirements apply for LiDAR preliminary processing. 2014-09-30T00:00:00 Ground Survey: RTK GPS based surveys were utilized to support both processing and testing of LiDAR data within FEMA designated Areas of Interest (AOIs). Geographically distinct ground points were surveyed using GPS technology throughout the AOIs to provide support for three distinct tasks. Task 1: Ground control monuments utilized for the STARR Ketchikan LiDAR dataset. Ground control monuments are used to provide redundant control within 13 nautical miles of mission areas for LiDAR flights, as well as the collection of ground control points using real-time kinematic (RTK) survey techniques. The horizontal datum for this dataset is NAD83 (2011), the vertical datum is NAVD88, Geoid 12A, and the data is projected in Alaska State Plane Zone 1. Units are in US Survey Feet. Task 2: RTK (real time kinematic) ground control points collected for the STARR Ketchikan LiDAR dataset. RTK ground control points are used to correct and verify the vertical accuracy of the LiDAR data. The horizontal datum for this dataset is NAD83 (2011), the vertical datum is NAVD88, Geoid 12A, and the data is projected in Alaska State Plane Zone 1. Units are in US Survey Feet. Task 3: Land cover class ground check points collected for the STARR Ketchikan LiDAR dataset. Land class ground check points are used to assess the vertical accuracy of the LiDAR data and are collected using real time kinematic (RTK) survey techniques. The horizontal datum for this dataset is NAD83 (2011), the vertical datum is NAVD88, Geoid 12A, and the data is projected in Alaska State Plane Zone 1. Units are in US Survey Feet. 2014-07-01T00:00:00 LiDAR Acquisition: General: LiDAR collection was collected using a Leica ALS70 system mounted in a Piper Navajo airplane. Yielded an average pulse density of >= 4 pulses/square meter over the Ketchikan Project Area. Swath Acquisition: This swath dataset represents the STARR Ketchikan LiDAR study area. This data is delineated in 4800x4800 ft tiles. Tile naming is derived from the 4 four digits of the easting and first four digits of the northing coordinates of the lower left corner. Data is unclassified (class 0). The horizontal datum for this dataset is NAD83 (2011), the vertical datum is NAVD88, Geoid 12A, and it is projected in Alaska State Plane Zone 1. Units are in US Survey Feet. Quantum Spatial collected the STARR Ketchikan LiDAR data for STARR on 07/12/2014 and 07/13/2014 further information is available in the Ketchikan Post-Flight Aerial Acquisition Report. All areas were surveyed with an opposing flight line side-lap of >=50% (=100% overlap) in order to reduce laser shadowing and increase surface laser painting. To accurately solve for laser point position (geographic coordinates x, y and z), the positional coordinates of the airborne sensor and the attitude of the aircraft were recorded continuously throughout the LiDAR data collection mission. Position of the aircraft was measured twice per second (2 Hz) by an onboard differential GPS unit, and aircraft attitude was measured 200 times per second (200 Hz) as pitch, roll and yaw (heading) from an onboard inertial measurement unit (IMU). All swath data were classified as Class 0 or Unclassified. Leica ALS70 Instrument Parameters: Beam diameter: 37 cm cm, Pulse rate: 175 kHz, Maximum returns: 4, Speed: 150 knots, Overlap: 60 %, Laser power: 93.6 %, Field of view (FOV): 30 degrees, Beam wavelength: 1064 nm, Frequency of GPS sampling: 2 Hz, Frequency of IMU sampling: 200 Hz, Swath width: 857 m, AGL: 5207 - 5315 MSL m, Average pulse density: 4 2014-07-13T00:00:00 Bare Earth Processing: QSI processing staff initiated a suite of automated and manual techniques to process the data into ASPRS Class 2 Bare Earth. The calibrated and filt ered LiDAR point cloud was hand checked for accuracy. Generate bare earth models as triangulated surfaces. The calibrated and filtered LiDAR point cloud was hand checked for accuracy. All points were placed in one of the following categories: 1 Unclassified, 2 Ground, 7 Noise, and 12 Overlap Points. Model Key points were then generated from the Ground points and placed in Category 8. Requested elevation values were evaluated for the Consolidated Vertical Accuracy (CVA) testing. Ketchikan Classified LiDAR ASPRS Classifications 1 Unclassified 2 Ground 2014-09-30T00:00:00 Digital Elevation Model tiles were received in ESRI Arc coverage proprietary format from FEMA. Tiles were in Alaska state plane zone 01 US survey feet with vertical units of US survey feet. The vertical datum was NAVD88 using the NGS Geoid12a geoid model. Data were converted to tif format and changed to horizontal and vertical meters for ingest in the Digital Coast Data Access Viewer. The change of horizontal units was done because the system was not processing the files in US survey feet correctly. This projection does not have an EPSG code. EPSG code 6394 was used for Alaska State Plane Zone 1 NAD83(2011) in meters. Tests showed this data was correctly interpreted in some software, but not all software. The data in both feet and meters is available on the bulk download data access link. 2018-05-01T00:00:00 Office for Coastal Management processor Source Contribution: KETCHIKAN, AK 2ft Contours. Ketchikan 2ft Contours 2014-12-31 publication 2014-12-31 Source Contribution: KETCHIKAN, AK 3ft Bare Earth Digital Elevation Models. Ketchikan 3ft Digital Elevation Models 2014-12-31 publication 2014-12-31 Source Contribution: KETCHIKAN, AK LiDAR Acquisition vector data. Ketchikan Collection Area, Flight Lines, LiDAR Swath Index and LiDAR Tile Index 2014-12-31 publication 2014-12-31 Source Contribution: KETCHIKAN, AK LiDAR Acquisition ground control survey. Ketchikan Ground Control Survey 2014-12-31 publication 2014-12-31 Source Contribution: KETCHIKAN, AK LiDAR Acquisition Classified LAS Bare Earth point cloud data. Ketchikan Ketchikan Classified Tiled Point Cloud 2014-12-31 publication 2014-12-31 Source Contribution: KETCHIKAN, AK LiDAR Acquisition Unclassified LAS raw point cloud data. Ketchikan Ketchikan Unclassified Swath Point Cloud 2014-12-31 publication 2014-12-31 Source Contribution: Quality Assurace Report for LiDAR and derivative products part of the Technical Support Data Notebook that contains complete narrative on the acquisition and processing of the LiDAR dataset, including area diagram, reports, metadata and other supporting documentation. Ketchikan LiDAR Quality Assurance Report 2014-12-31 publication 2014-12-31 Source Contribution: KETCHIKAN, AK LiDAR Acquisition Documentation. Ketchikan Pre-Flight Planning Report and Post Flight Report 2014-12-31 publication 2014-12-31