2015 - 2016 LARIAC Lidar DEM: Los Angeles Region, CA
OCM Partners
Data Set
(DS)
| ID: 55257
| Published / External
Created: 2018-12-14
|
Last Modified: 2023-08-15
Project (PRJ) | ID: 49404
ID: 55257
Data Set (DS)
* Discovery• First Pass
» Metadata Rubric
Item Identification
* » Title | 2015 - 2016 LARIAC Lidar DEM: Los Angeles Region, CA |
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Short Name | ca2015_la_dem_m8659_metadata |
* Status | Completed |
Creation Date | |
Revision Date | |
• Publication Date | 2017-04-20 |
* » Abstract |
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. |
* Purpose |
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. |
Notes | |
Other Citation Details | |
• Supplemental Information |
CONTRACTOR: Pictometry International, Inc. |
DOI (Digital Object Identifier) | |
DOI Registration Authority | |
DOI Issue Date |
Keywords
Theme Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Science Keywords | EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION |
Global Change Master Directory (GCMD) Science Keywords | EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION |
None | Bare earth |
None | DEM |
Temporal Keywords
Thesaurus | Keyword |
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* Spatial Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Location Keywords | CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > CALIFORNIA |
Global Change Master Directory (GCMD) Location Keywords | VERTICAL LOCATION > LAND SURFACE |
Stratum Keywords
Thesaurus | Keyword |
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Instrument Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Instrument Keywords | LIDAR > Light Detection and Ranging |
Platform Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Platform Keywords | Airplane > Airplane |
Global Change Master Directory (GCMD) Platform Keywords | DEM > Digital Elevation Model |
Physical Location
• » Organization | Office for Coastal Management |
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• » City | Charleston |
• » State/Province | SC |
• Country | |
• » Location Description |
Data Set Information
* Data Set Scope Code | Data Set |
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• Data Set Type | Elevation |
• Maintenance Frequency | None Planned |
Maintenance Note | |
» Data Presentation Form | Model (digital) |
• Entity Attribute Overview | |
Entity Attribute Detail Citation | |
Entity Attribute Detail URL | |
Distribution Liability |
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 |
Data Set Credit | Pictometry International, Inc., LARIAC |
Support Roles
* » Support Role | Data Steward |
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* » Date Effective From | 2018-12-14 |
Date Effective To | |
Organization | NOAA Office for Coastal Management (NOAA/OCM) |
Address |
2234 South Hobson Ave Charleston, SC 29405-2413 |
Email Address | coastal.info@noaa.gov |
Phone | (843) 740-1202 |
Fax | |
Mobile | |
URL | https://coast.noaa.gov |
Business Hours | |
Contact Instructions |
* » Support Role | Distributor |
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* » Date Effective From | 2018-12-14 |
Date Effective To | |
Organization | NOAA Office for Coastal Management (NOAA/OCM) |
Address |
2234 South Hobson Ave Charleston, SC 29405-2413 |
Email Address | coastal.info@noaa.gov |
Phone | (843) 740-1202 |
Fax | |
Mobile | |
URL | https://coast.noaa.gov |
Business Hours | |
Contact Instructions |
* » Support Role | Metadata Contact |
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* » Date Effective From | 2018-12-14 |
Date Effective To | |
Organization | NOAA Office for Coastal Management (NOAA/OCM) |
Address |
2234 South Hobson Ave Charleston, SC 29405-2413 |
Email Address | coastal.info@noaa.gov |
Phone | (843) 740-1202 |
Fax | |
Mobile | |
URL | https://coast.noaa.gov |
Business Hours | |
Contact Instructions |
* » Support Role | Point of Contact |
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* » Date Effective From | 2018-12-14 |
Date Effective To | |
Organization | NOAA Office for Coastal Management (NOAA/OCM) |
Address |
2234 South Hobson Ave Charleston, SC 29405-2413 |
Email Address | coastal.info@noaa.gov |
Phone | (843) 740-1202 |
Fax | |
Mobile | |
URL | https://coast.noaa.gov |
Business Hours | |
Contact Instructions |
* » Support Role | |
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* Contact Instructions |
Extents
Currentness Reference | Ground Condition |
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Extent Group 1
Extent Description |
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Extent Group 1 / Geographic Area 1
* » W° Bound | -118.9593531 |
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* » E° Bound | -117.63773 |
* » N° Bound | 34.8263383 |
* » S° Bound | 33.2916879 |
* » Description |
Extent Group 1 / Vertical Extent
EPSG Code | |
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Vertical Minimum | |
Vertical Maximum |
Extent Group 1 / Time Frame 1
* » Time Frame Type | Range |
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* » Start | 2015-09-27 |
End | 2016-10-18 |
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Alternate End As Of Info | |
Description |
Spatial Information
Spatial Resolution
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Spatial Representation
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Grid Representation
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Vector Representation
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Point Object Present? | |
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Solid Object Present? | |
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Surface Object Present? | |
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Reference Systems
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Access Information
* » Security Class | Unclassified |
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* Security Classification System | |
Security Handling Description | |
• Data Access Policy | |
» Data Access Procedure |
Data is available online for bulk and custom downloads. |
• » Data Access Constraints |
None |
• Data 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. |
Metadata Access Constraints | |
Metadata Use Constraints |
Distribution Information
Start Date | 2018-12-14 |
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End Date | Present |
» Download URL | https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8659 |
Distributor | NOAA Office for Coastal Management (NOAA/OCM) (2018-12-14 - Present) |
File Name | Customized Download |
Description |
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. |
File Date/Time | |
File Type (Deprecated) | |
Distribution Format | |
File Size | |
Application Version | |
Compression | Zip |
Review Status |
Start Date | 2018-12-14 |
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End Date | Present |
» Download URL | https://coast.noaa.gov/htdata/raster2/elevation/CA_Los_Angeles_DEM_2015_8659 |
Distributor | NOAA Office for Coastal Management (NOAA/OCM) (2018-12-14 - Present) |
File Name | Bulk Download |
Description |
Bulk download of data files in the original coordinate system. |
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Compression | |
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URLs
URL | https://coast.noaa.gov/ |
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Name | NOAA's Office for Coastal Management (OCM) website |
URL Type | Online Resource |
File Resource Format | HTML |
Description |
Information on the NOAA Office for Coastal Management (OCM) |
URL | https://coast.noaa.gov/dataviewer/ |
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Name | NOAA's Office for Coastal Management (OCM) Data Access Viewer (DAV) |
URL Type | Online Resource |
File Resource Format | HTML |
Description |
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. |
URL | https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8651/supplemental/ca2015_la_m8651.kmz |
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Name | Browse graphic |
URL Type | Browse Graphic |
File Resource Format | KML |
Description |
This graphic displays the footprint for this lidar data set. |
URL | https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8651/supplemental/Project_Report.pdf |
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Name | Dataset report |
URL Type | Online Resource |
File Resource Format | |
Description |
Link to data set report. |
URL | https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8651/supplemental/Lariac_USGS_vertical_accuracy_report.pdf |
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Name | |
URL Type | Online Resource |
File Resource Format | |
Description |
Link to the vertical accuracy report. |
URL | https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8651/breaklines/ |
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Name | |
URL Type | Online Resource |
File Resource Format | |
Description |
Link to the breakline data. |
URL | https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8651 |
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Name | |
URL Type | Online Resource |
File Resource Format | |
Description |
Link to custom download the lidar point data from which these raster Digital Elevation Model (DEM) data were created. |
URL | |
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Activity Log
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Issues
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Technical Environment
Description |
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.2.1.3497 |
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Data Quality
Representativeness | |
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Accuracy | |
Analytical Accuracy | |
Horizontal Positional Accuracy | |
Vertical Positional Accuracy |
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. |
Quantitation Limits | |
Bias | |
Comparability | |
Completeness Measure | |
Precision | |
Analytical Precision | |
Field Precision | |
Sensitivity | |
Detection Limit | |
Completeness Report |
LiDAR intensity values were captured at 12-bit levels and scaled down to 8-bit during processing of the intensity raster. |
Conceptual Consistency |
Data cover the entire area specified for this project. |
» Quality Control Procedures Employed |
Data Management
» Have Resources for Management of these Data Been Identified? | |
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» Approximate Percentage of Budget for these Data Devoted to Data Management | |
» Do these Data Comply with the Data Access Directive? | |
» Is Access to the Data Limited Based on an Approved Waiver? | |
» If Distributor (Data Hosting Service) is Needed, Please Indicate | |
» Approximate Delay Between Data Collection and Dissemination | |
» If Delay is Longer than Latency of Automated Processing, Indicate Under What Authority Data Access is Delayed |
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» Actual or Planned Long-Term Data Archive Location | |
» If World Data Center or Other, Specify | |
» If To Be Determined, Unable to Archive, or No Archiving Intended, Explain |
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» Approximate Delay Between Data Collection and Archiving | |
» How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive? |
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Lineage
» Lineage Statement |
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Sources
Citation Title | Ground Control for Los Angeles County, CA LARIAC4 lidar project. |
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Contact Role Type | |
Contact Type | |
Contact Name | |
Publish Date | 2015-11-02 |
Extent Type | Discrete |
Extent Start Date/Time | 2015-11-02 |
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Citation URL Description | |
Source Contribution |
This data source was used (along with the airborne GPS/IMU data) to georeference the lidar point cloud data. |
Citation Title | LA County GCP Report 2015.pdf |
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Contact Role Type | |
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Publish Date | |
Extent Type | Discrete |
Extent Start Date/Time | 2017-04-20 |
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Source Contribution |
Laser data derived from aerial survey |
Citation Title | Lidar Intensity Imagery for Los Angeles County, CA |
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Publish Date | 2017-04-20 |
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This data source was used to verify proper sensor operation. |
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Process Steps
Process Step Number | 1 |
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» Description |
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. |
Process Date/Time | 2016-02-26 00:00:00 |
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Process Step Number | 2 |
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» Description |
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. |
Process Date/Time | 2017-04-20 00:00:00 |
Process Contact | |
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Process Step Number | 3 |
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» Description |
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 |
Process Date/Time | 2018-12-14 00:00:00 |
Process Contact | Office for Coastal Management (OCM) |
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Acquisition Information
Instruments
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FAQs
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Child Items
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Related Items
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Catalog Details
Catalog Item ID | 55257 |
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Metadata Record Created By | Rebecca Mataosky |
Metadata Record Created | 2018-12-14 10:56+0000 |
Metadata Record Last Modified By | SysAdmin InPortAdmin |
» Metadata Record Last Modified | 2023-08-15 17:09+0000 |
Metadata Record Published | 2022-03-16 |
Owner Org | OCMP |
Metadata Publication Status | Published Externally |
Do Not Publish? | N |
Metadata Workflow State | Published / External |
Metadata Last Review Date | 2022-03-16 |
Metadata Review Frequency | 1 Year |
Metadata Next Review Date | 2023-03-16 |
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