gov.noaa.nmfs.inport:67815 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 2024-02-29T00:00:00 ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data ISO 19115-2:2009(E) NAD83(NSRS2007) 2008-11-12 publication European Petroleum Survey Group https://apps.epsg.org/api/v1/CoordRefSystem/4759/export/?format=gml urn:ogc:def:crs:EPSG:4759 6.18.3 North American Vertical Datum of 1988 (NAVD88) (GEOID12B) meters North American Vertical Datum of 1988 (NAVD88) (GEOID12B) meters https://apps.epsg.org/api/v1/VerticalCoordRefSystem/5703/?api_key=gml North American Vertical Datum of 1988 (NAVD88) (GEOID12B) meters Link to Geographic Markup Language (GML) description of reference system. information resourceProvider European Petroleum Survey Group https://www.epsg.org/ European Petroleum Survey Group Geodetic Parameter Registry Registry that accesses the EPSG Geodetic Parameter Dataset, which is a structured dataset of Coordinate Reference Systems and Coordinate Transformations. search publisher vertical OGP 2006-11-28 false urn:ogc:def:cs:EPSG::6499 Vertical CS. Axis: height (H). Orientation: up. UoM: meter. Used in vertical coordinate reference systems. urn:ogc:def:axis:EPSG::114 H up urn:ogc:def:crs:EPSG::5703 2011 FEMA Lidar: Cordova, Alaska ak2011_cordova_m9577_metadata 2011 creation 2012-04-24 publication NOAA/NMFS/EDM 67815 https://www.fisheries.noaa.gov/inport/item/67815 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/entwine/geoid12b/9577/ept.json WWW:LINK-1.0-http--link Entwine Point Tiles (EPT) Entwine Point Tile (EPT) is a simple and flexible octree-based storage format for point cloud data. The data is organized in such a way that the data can be reasonably streamed over the internet, pulling only the points you need. EPT files can be queried to return a subset of the points that give you a representation of the area. As you zoom further in, you are requesting higher and higher densities. A dataset in EPT will contain a lot of files, however, the ept.json file describes all the rest. The EPT file can be used in Potree and QGIS to view the point cloud. download https://elevation.alaska.gov/ WWW:LINK-1.0-http--link Lidar Reports Lidar acquisition and QA reports are available from the AK DGGS Elevation Portal. download https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=9578/details/9578 WWW:LINK-1.0-http--link Custom DEM Download Link to custom download, from the Data Access Viewer (DAV), the raster Digital Elevation Model (DEM) data that were created from this lidar data set. download https://coast.noaa.gov/lidar/viewer/v/noaapotree.html?m=9577&g=geoid12b WWW:LINK-1.0-http--link Potree 3D View Link to view the point cloud (using the Entwine Point Tile (EPT) format) in the 3D Potree viewer. 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 Bare Earth LiDAR point cloud data provided for this project is compliant with FEMA Guidelines and Specifications Procedure Memorandum 61. LiDAR derived products for two areas of interest within the Cordova, Alaska area, consisting of 32 square miles, were developed to support coastal or riverine H&H analysis and floodplain boundary delineation. The NOAA Office for Coastal Management (OCM) downloaded this data set from this AK DGGS site: https://elevation.alaska.gov/ These files were processed to the NOAA Digital Coast Data Access Viewer (DAV) and AWS S3. The total number of files downloaded and processed was 17. No metadata record was provided with the data. This record is populated with information from the FEMA Starr technical and QA reports downloaded from the Alaska Dept. of Geological and Geophysical Elevation Portal. In addition to the lidar point data, the bare earth Digital Elevation Model (DEM) data at a 1 meter grid spacing, created from the lidar point data are also available from the NOAA Digital Coast. Links to these data are provided in the URL section of this metadata record. This data set is an LAZ (compressed LAS) format file containing LIDAR point cloud data. The purpose of these terrain datasets are to represent the topography of a watershed and/or floodplain environment for Cordova, Alaska coastal or riverine hydraulic and hydrologic modeling. All terrain data collected for hydrologic analysis, hydraulic analysis, floodplain boundary delineation, and/or testing of floodplain boundary standard compliance meets the requirements outlined in FEMA Appendix A: Guidance for Aerial Mapping and Survey and FEMA Procedure Memorandum 61: Standards for LiDAR and Other High Quality Digital Topography. Federal Emergency Management Agency The custom download may be cited as National Oceanic and Atmospheric Administration (NOAA) Digital Coast Data Access Viewer. Charleston, SC: NOAA Office for Coastal Management. Accessed Jul 01, 2025 at https://coast.noaa.gov/dataviewer. 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/9577/supplemental/ak2011_cordova_m9577.kmz This graphic displays the footprint for this lidar data set. KMZ 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 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 Lidar - partner (no harvest) project InPort otherRestrictions Cite As: OCM Partners, [Date of Access]: 2011 FEMA Lidar: Cordova, Alaska [Data Date Range], https://www.fisheries.noaa.gov/inport/item/67815. 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 2011 FEMA Lidar DEM: Cordova, Alaska NOAA/NMFS/EDM 67831 crossReference 2012 FEMA Lidar: Valdez, Alaska NOAA/NMFS/EDM 52860 crossReference NOAA Data Management Plan (DMP) NOAA/NMFS/EDM 67815 https://www.fisheries.noaa.gov/inportserve/waf/noaa/nos/ocmp/dmp/pdf/67815.pdf WWW:LINK-1.0-http--link NOAA Data Management Plan (DMP) NOAA Data Management Plan for this record on InPort. information crossReference vector eng; US elevation -145.814597 -145.604905 60.51737 60.568287 | Currentness: Ground Condition 2011-09-23 | Currentness: Ground Condition 2011-09-25 false eng false Appendix M of FEMA Guidelines and Specifications for FEMA Flood Hazard Mapping Partners contains a detailed description of the data themes and references to other relevant information. Zip Zip LAS/LAZ - LASer Zip 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=9577/details/9577 WWW:LINK-1.0-http--link Customized Download Create custom data files by choosing data area, product type, map projection, file format, datum, etc. A new metadata will be produced to reflect your request using this record as a base. Change to an orthometric vertical datum is one of the many options. download https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/9577/index.html WWW:LINK-1.0-http--link Bulk Download Bulk download of data files in LAZ format, geographic coordinates, orthometric heights. Note that the vertical datum (hence elevations) of the files here are different than described in this document. They will be in an orthometric datum. download dataset Vertical Positional Accuracy Fundamental Vertical Accuracy (FVA) checkpoints are located only in open terrain, where there is a high probability that the sensor will have detected the ground surface without influence from surrounding vegetation and/or buildings. Checkpoints are located on flat or uniformly sloping terrain and at least five (5) meters away from a change in slope. Checkpoints are located randomly across the acquisition area. At least 20 FVA points were collected for each test. Consolidated Vertical Accuracy (CVA) checkpoints are collected randomly across different land use types using the ASPRS NSSDA land cover types. The points are located in flat areas with no substantial elevation breaks within a five meter radius. The CVA assessment incorporates a representative sample of the FVA assessment points into the dataset to save on the total number of points collected. CVA points were not collected for any land class comprising less that 10% of the total project area; this may have resulted in less than 4 land classes being collected in a particular area. At least 15 CVA points were collected and 5 FVA points used, for a total of at least 20 points for the CVA testing. All points were collected at three times the accuracy of the surface being checked. Thus to check a 24.5 cm surface the points were collected accurate to 8 cm. Tests were conducted when processing by the LiDAR vendor was complete and points were called for. The surveyor provided the point coordinates in an excel spreadsheet to the LiDAR vendor. The LiDAR vendor found the corresponding elevation from a surface created from the LiDAR points, filled in the spreadsheet and returned it to the surveyor who compared the elevation of the LiDAR data with that of the accuracy check point, calculated the difference and reported their findings both in terms of RMSEz and at the 95% confidence level (computed as RMSEz x 1.9600). LiDAR datasets passing the quality control checks were delivered to STARR for quality assurance approval. Tested 36.0 cm consolidated vertical accuracy at 95th percentile in: open terrain, forest terrain, and urban terrain. The Root Mean Square Error for the elevation differences between GPS control points and LiDAR points is 15.8 cm calculated with 43 supplemental vertical accuracy points (SVA). The vertical accuracy requirements based on flood risk and terrain slope are met with 10.2 cm and 36.0 cm for both FVA and CVA testing. The mandatory requirements for the highest specification for vertical accuracy, 95% confidence levels are < 24.5 cm for FVA and <36.3 cm for CVA. Independent review of submitted FVA and CVA survey data with vendor provided LAS files. Survey data points containing field collected GPS elevation values were buffered by 10 meters. LiDAR points contained within the buffered areas are selected and used to create a TIN. The TIN facet z value closest to the x and y control point location is compared to the height of the survey point. The height difference is evaluated statistically and compared to the submitted FVA and CVA testing results to insure the vertical accuracy meets project expectations. Consolidated Vertical Accuracy (CVA) equal to the 95th Percentile calculated against the bare earth surface in all ground cover classes was 0.36 meters. Fundamental Vertical Accuracy (FVA) equal to the 95% confidence level (RMSE[z] x 1.9600) calculated against the point cloud (unclassified LAS) was 0.102 meters. Completeness Report Elevation data has been collected for all areas inside project boundaries. No gaps as defined by FEMA Procedural Memo No. 61 are known to exist within the dataset. Conceptual Consistency The terrain data have been confirmed as complete with content as specified by FEMA Procedural Memo No. 61. Data were collected by Aerometric, Inc. for FEMA. OCM downloaded the data from the Alaska DGGS Elevation Portal and processed the data to be available for custom download from the NOAA Digital Coast Data Access Viewer (DAV) and for bulk download from AWS S3. Process Steps For products derived from Cordova, Alaska LiDAR Data: 1-Create Cordova, AK ESRI file geodatabase feature dataset with NAD_1983_UTM_Zone_6N projection. 2-Use ESRI 3D analyst tool LAS to multipoint and created bare earth multipoint featureclass stored within Cordova, AK file geodatabase feature dataset. 3-Use ESRI Arc Catalog to create an ESRI terrain dataset stored within Cordova, AK file geodatabase feature dataset. The multipoints were added to the terrain as mass points using the shape as the height source and the study area polygon was added to the terrain as a soft clip without any height source. 1 meter or 3.2808399 ft average point spacing used. This was determined from Cordova, AK acquisition metadata. 4-Create Bare Earth DEM file geodatabase for Cordova, AK 5-Use 3D analyst tool Terrain to raster to create 2 meter DEM and store within Cordova, AK Bare Earth DEM file geodatabase. 6-Create Raster Index Polygon 7-Using ERDAS Imagine split 2 meter AOI DEM into GeoTif Format based on raster index. 8-Using ArcCatalog converted GeoTif DEMs into Ascii raster format. 9-Create Cordova, AK Cartographic Contours and Analysis Contours file geodatabase feature datasets with NAD_1983_UTM_Zone_6N projection. 10-Use ESRI spatial analyst neighborhood tool focal statistics (mean statistic using circle with 3 cell radius) on each GeoTif bare earth DEM. 11-Use ESRI spatial analyst surface tool Contour to create 2ft contour from focal mean GeoTif DEMs and stored within Cordova, AK Cartographic Contours file geodatabase feature dataset. 12-Use ESRI spatial analyst neighborhood tool focal statistics (sum statistic using weighted kernel) on each GeoTif bare earth DEM. Weighted Kernel: 3 3 .005 .005 .005 .005 .960 .005 .005 .005 .005 13-Use ESRI spatial analyst surface tool Contour to create 2ft contour from focal sum GeoTif DEMs and stored within Cordova, AK Analysis Contours file geodatabase feature dataset. 2012-01-01T00:00:00 The NOAA Office for Coastal Management (OCM) downloaded 17 laz files from the Alaska DGGS Elevation Portal at: https://elevation.alaska.gov/. The files were in UTM Zone 6 (NAD83), meters coordinates and were in NAVD88 (Geoid09) elevations in feet. The point classifications were: 2 - Ground, 8 - Model Key Point. OCM processed all classifications of points to the Digital Coast Data Access Viewer (DAV). Classes available on the DAV are: 2, 8. No metadata record was provided with the data. This record is populated with information from the FEMA Starr technical and QA reports downloaded from the Alaska Dept. of Geological and Geophysical Elevation Portal. OCM performed the following processing on the data for Digital Coast storage and provisioning purposes: 1. An internal OCM script was run to check the number of points by classification and by flight ID and the gps and intensity ranges. 2. Internal OCM scripts were run on the laz files to convert from orthometric (NAVD88) elevations to ellipsoid elevations using the Geoid09 model, to convert from UTM Zone 6 (NAD83), meters coordinates to geographic coordinates, to convert from vertical units of feet to meters, to assign the geokeys, to sort the data by gps time and zip the data to database and to AWS S3. 2022-09-02T00:00:00 Office for Coastal Management processor Alaska Division of Geological and Geophysical Surveys (DGGS) AK DGGS https://elevation.alaska.gov/ WWW:LINK-1.0-http--link AK DGGS Elevation Portal Source Citation URL information publisher The vertical values in this data set have been converted to reference North American Vertical Datum of 1988 (NAVD88) (GEOID12B) meters, using the GEOID12B grids provided by the National Geodetic Survey. Any datum and projection transformations were then done with the Office for Coastal Management 'datum_shift' program. Compression to an LAZ file was done with the LAStools 'laszip' program and can be unzipped with the same free program (https://rapidlasso.de/laszip/) Processing notes: 2025-07-01T09:40:12 NOAA Office for Coastal Management coastal.info@noaa.gov processor