55257 ca2015_la_dem_m8659_metadata Data Set Published / External 49404 DEMs - partner (no harvest) Project Completed 2017-04-20 This raster dataset contains LiDAR-derived elevation data flown from Fall 2015 to Spring 2016, with additional reflights through Fall 2016. This dataset encompasses all of the LARIAC4 project, comprised of approximately 4214 square miles. The NOAA Office for Coastal Management (OCM) downloaded this digital elevation model (DEM) data from the USGS site: ftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/OPR/CA_LosAngeles_2016// and processed the data to be available on the Digital Coast Data Access Viewer (DAV). 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. Breakline data are also available. These data are are available for download at the link provided in the URL section of this metadata record. These products have not been reviewed by the NOAA Office for Coastal Management (OCM) and any conclusions drawn from the analysis of this information are not the responsibility of NOAA or OCM. The purpose of this dataset is to create a representation of the topology of the study area with all vegetation and man-made structures removed. In addition, this dataset was used for creation and QC of contours and hydro-breaklines, in tandem with the raw LiDAR data. CONTRACTOR: Pictometry International, Inc. 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 Spatial Global Change Master Directory (GCMD) Location Keywords CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > CALIFORNIA Spatial Global Change Master Directory (GCMD) Location Keywords VERTICAL LOCATION > LAND SURFACE 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 Bare earth Theme DEM Office for Coastal Management Charleston SC Data Set Elevation None Planned Model (digital) In no event shall the creators, custodians, or distributors of these data be liable for any damages arising out of its use, or from the inability of the customer to use these data for their intended application. Any conclusions drawn from the analysis of this information are not the responsibility of Pictometry, LARIAC, USGS, NOAA, the Office for Coastal Management or its partners Pictometry International, Inc., LARIAC Data Steward 2018-12-14 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 2018-12-14 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 2018-12-14 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 2018-12-14 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 -118.9593531 -117.63773 34.8263383 33.2916879 Range 2015-09-27 2016-10-18 Unclassified Data is available online for bulk and custom 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://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8659 2018-12-14 Organization NOAA Office for Coastal Management 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. Zip https://noaa-nos-coastal-lidar-pds.s3.us-east-1.amazonaws.com/dem/CA_Los_Angeles_DEM_2015_8659/index.html 2018-12-14 Organization NOAA Office for Coastal Management Bulk Download Bulk download of data files in the original coordinate system. https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8651/supplemental/ca2015_la_m8651.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/ NOAA's Office for Coastal Management (OCM) Data Access Viewer (DAV) Online Resource HTML 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. https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8651 Online Resource Link to custom download the lidar point data from which these raster Digital Elevation Model (DEM) data were created. https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8651/breaklines/ Online Resource Link to the breakline data. https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8651/supplemental/Lariac_USGS_vertical_accuracy_report.pdf Online Resource Link to the vertical accuracy report. https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8651/supplemental/Project_Report.pdf Dataset report Online Resource PDF Link to data set report. Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.2.1.3497 The same 212 checkpoints that were used to test the vertical accuracy of the lidar, were used to validate the vertical accuracy of the final DEM products as well. Accuracy results may vary between the source lidar and final DEM deliverable. DEMs are created by averaging several lidar points within each pixel which may result in slightly different elevation values at each survey checkpoint when compared to the source LAS, which does not average several lidar points together but may interpolate (linearly) between two or three points to derive an elevation value. The vertical accuracy of the DEM is tested by extracting the elevation of the pixel that contains the x/y coordinates of the checkpoint and comparing these DEM elevations to the surveyed elevations. Dewberry typically uses LP360 software to test the swath lidar vertical accuracy, Terrascan software to test the classified lidar vertical accuracy, and Esri ArcMap to test the DEM vertical accuracy so that three different software programs are used to validate the vertical accuracy for each project. This DEM dataset was tested to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014) for a 10 cm (0.33 ft) RMSEz Vertical Accuracy Class. Actual NVA accuracy was found to be RMSEz = 0.31 ft (9.4 cm), equating to +/- 0.60 ft (18.2 cm) at 95% confidence level. Actual VVA accuracy was found to be +/- 0.52 ft (15,8 cm) at the 95th percentile. LiDAR intensity values were captured at 12-bit levels and scaled down to 8-bit during processing of the intensity raster. Data cover the entire area specified for this project. Ground Control for Los Angeles County, CA LARIAC4 lidar project. 2015-11-02 Discrete 2015-11-02 This data source was used (along with the airborne GPS/IMU data) to georeference the lidar point cloud data. LA County GCP Report 2015.pdf Discrete 2017-04-20 Laser data derived from aerial survey Lidar Intensity Imagery for Los Angeles County, CA 2017-04-20 This data source was used to verify proper sensor operation. 1 Lidar Preprocessing: Airborne GPS and IMU data were merged to develop a Single Best Estimate (SBET) of the lidar system trajectory for each lift. Lidar ranging data were initially calibrated using previous best parameters for this instrument and aircraft. Relative calibration was evaluated using advanced plane-matching analysis and parameter corrections were derived. This relative calibration was repeated iteratively until residual errors between overlapping swaths, across all project lifts, was reduced to 3 cm or less. Data were then block adjusted to match surveyed calibration control. 2016-02-26T00:00:00 2 Lidar Post-Processing: After generation of the calibrated point cloud data in LAS format from Optech's Lidar Mapping Suite (LMS), the data is imported into the TerraSolid software suite (running under Bentley’s MicroStation) for matching and classification. Upon import, the data is divided into tiles for the purpose of creating more manageable data. Once imported to TerraSolid, blocks of data containing overlapping flight lines are selected. The data in these blocks is analyzed by TerraMatch and adjustments to the roll, pitch, heading, and scale that minimize any data misalignment between the flight lines are computed. These adjustments are then applied to the entire mission’s worth of data. Data across the mission is then manually reviewed to ensure proper alignment between flightlines has been achieved. This process is then repeated for each mission; once complete, intra-sortie alignment is verified. 2017-04-20T00:00:00 3 The NOAA Office for Coastal Management (OCM) downloaded 13810 CA_LosAngeles_2016/ Digital Elevation Model (DEM) files from this USGS site: ftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/OPR/ and processed the data to the Data Access Viewer (DAV). The data were in CA State Plane Zone 5 coordinates and NAVD88 (Geoid12B) elevations in feet. The bare earth raster files were at a 1 meter grid spacing. OCM performed the following processing on the data for Digital Coast storage and provisioning purposes: 1. Converted to Cloud Optimized GeoTiff format. 2. Added georeferencing for the vertical 2018-12-14T00:00:00 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:55257 Rebecca Mataosky 2018-12-14T10:56:03 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