2019 USGS Lidar: North Alabama
Data Set (DS) | OCM Partners (OCMP)GUID: gov.noaa.nmfs.inport:72737 | Updated: June 7, 2024 | Published / External
Summary
Short Citation
OCM Partners, 2025: 2019 USGS Lidar: North Alabama, https://www.fisheries.noaa.gov/inport/item/72737.
Full Citation Examples
Product: Classified LAS 1.4 USGS NGTOC task order 140G0219F0286 required Fall 2019/Spring 2020 LiDAR survey to be collected over 1,094 square miles covering part or all of 5 counties in Alabama. These counties are Limestone, Madison, Jackson, Morgan, and Marshall. Aerial LiDAR data for this task order was planned, acquired, processed and produced at an aggregate nominal pulse spacing (ANPS) of less than or equal to 0.5 meters and in compliance with USGS National Geospatial Program LiDAR Base Specification version 1.3.
This metadata supports the data entry in the NOAA Digital Coast Data Access Viewer (DAV). For this data set, the DAV is leveraging the Entwine Point Tiles (EPT) hosted by USGS on Amazon Web Services.
Distribution Information
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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.
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LAS/LAZ - LASer
Bulk download of data files in LAZ format, based on a horizontal datum/projection of Albers Conic, NAD83(2011), meters (EPSG: 6350) and a vertical datum of NAVD88 (GEOID12B) and units in meters (EPSG: 5703).
No restrictions apply to this data. The data represented is the result of data collection and processing per contract specifications and indicates the general existing conditions at the time of the data collection. As such, it is only valid for its intended use, content, time, and accuracy specifications. The user is responsible for the results of any application of the data for other than its intended purpose.
None. However, users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of the limitations of the data. Acknowledgment of owner would be appreciated for products derived from these data. The data represented is the result of data collection and processing per contract specifications and indicates the general existing conditions at the time of the data collection. As such, it is only valid for its intended use, content, time, and accuracy specifications. The user is responsible for the results of any application of the data for other than its intended purpose.
Controlled Theme Keywords
elevation, TERRAIN ELEVATION
Child Items
No Child Items for this record.
Contact Information
Point of Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202
https://coast.noaa.gov
Metadata Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202
https://coast.noaa.gov
Extents
-86.95° W,
-86.22° E,
35.01° N,
34.4° S
2019-12-04 - 2019-12-30
Dates of collection
Item Identification
Title: | 2019 USGS Lidar: North Alabama |
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Short Name: | al2019_north_al_m10126_metadata |
Status: | Completed |
Creation Date: | 2019 |
Publication Date: | 2021 |
Abstract: |
Product: Classified LAS 1.4 USGS NGTOC task order 140G0219F0286 required Fall 2019/Spring 2020 LiDAR survey to be collected over 1,094 square miles covering part or all of 5 counties in Alabama. These counties are Limestone, Madison, Jackson, Morgan, and Marshall. Aerial LiDAR data for this task order was planned, acquired, processed and produced at an aggregate nominal pulse spacing (ANPS) of less than or equal to 0.5 meters and in compliance with USGS National Geospatial Program LiDAR Base Specification version 1.3. This metadata supports the data entry in the NOAA Digital Coast Data Access Viewer (DAV). For this data set, the DAV is leveraging the Entwine Point Tiles (EPT) hosted by USGS on Amazon Web Services. |
Purpose: |
This task order is for planning, acquisition, processing, and derivative products of lidar data to be collected at an aggregate nominal pulse spacing of 0.5 meters, including overlap and an aggregate nominal pulse density of no less than 2 points per square meter. Lidar data and derivative products produced in compliance with this task order are based on the National Geospatial Program Lidar Base Specification Version 1.3. This data will be used to generate Digital Elevation Models (DEMs) for the use in dam safety assessments, engineering design and design reviews, conservation planning, research, delivery, floodplain mapping, and hydrologic modeling utilizing lidar technology for partners including: the Tennessee Valley Authority, Huntsville Utilities, City of Huntsville, and Madison County Tax Assessor's Office; it will also support the 3DEP mission. |
Supplemental Information: |
Prime Contractor: The Atlantic Group, LLC. Lidar data were acquired and calibrated by The Atlantic Group. All follow-on processing was completed by the prime contractor.
The following are the USGS lidar fields in JSON: {
"ldrinfo" : {
"ldrspec" : "Base Specifications 1.3", "ldrsens" : "Teledyne Optech Galaxy Prime", "ldrmaxnr" : "8", "ldrnps" : "0.4350",
|
Keywords
Theme Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Science Keywords |
EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION
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ISO 19115 Topic Category |
elevation
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Spatial Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Location Keywords |
CONTINENT
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Global Change Master Directory (GCMD) Location Keywords |
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA
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Global Change Master Directory (GCMD) Location Keywords |
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALABAMA
|
Global Change Master Directory (GCMD) Location Keywords |
VERTICAL LOCATION > LAND SURFACE
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Instrument Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Instrument Keywords |
LIDAR > Light Detection and Ranging
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Platform Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Platform Keywords |
Airplane > Airplane
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Physical Location
Organization: | Office for Coastal Management |
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City: | Charleston |
State/Province: | SC |
Data Set Information
Data Set Scope Code: | Data Set |
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Data Set Type: | Elevation |
Maintenance Frequency: | Unknown |
Data Presentation Form: | Model (digital) |
Distribution Liability: |
No restrictions apply to this data. The data represented is the result of data collection and processing per contract specifications and indicates the general existing conditions at the time of the data collection. As such, it is only valid for its intended use, content, time, and accuracy specifications. The user is responsible for the results of any application of the data for other than its intended purpose. Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners. |
Data Set Credit: | The Atlantic Group, LLC, USGS |
Support Roles
Data Steward
Date Effective From: | 2024 |
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Date Effective To: | |
Contact (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 |
URL: | https://coast.noaa.gov |
Distributor
Date Effective From: | 2024 |
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Date Effective To: | |
Contact (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 |
URL: | https://coast.noaa.gov |
Distributor
Date Effective From: | 2021 |
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Date Effective To: | |
Contact (Organization): | U.S. Geological Survey |
Address: |
12201 Sunrise Valley Drive Reston, VA 20191 USA |
URL: | USGS Home |
Metadata Contact
Date Effective From: | 2024 |
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Date Effective To: | |
Contact (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 |
URL: | https://coast.noaa.gov |
Point of Contact
Date Effective From: | 2024 |
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Date Effective To: | |
Contact (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 |
URL: | https://coast.noaa.gov |
Extents
Currentness Reference: | Ground Condition |
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Extent Group 1
Extent Group 1 / Geographic Area 1
W° Bound: | -86.95 | |
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E° Bound: | -86.22 | |
N° Bound: | 35.01 | |
S° Bound: | 34.4 |
Extent Group 1 / Time Frame 1
Time Frame Type: | Range |
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Start: | 2019-12-04 |
End: | 2019-12-30 |
Description: |
Dates of collection |
Spatial Information
Spatial Representation
Representations Used
Grid: | No |
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Vector: | Yes |
Text / Table: | No |
TIN: | No |
Stereo Model: | No |
Video: | No |
Reference Systems
Reference System 1
Coordinate Reference System |
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Reference System 2
Coordinate Reference System |
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Access Information
Security Class: | Unclassified |
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Data Access Procedure: |
Data is available online for bulk and custom downloads. |
Data Access Constraints: |
No restrictions apply to this data. The data represented is the result of data collection and processing per contract specifications and indicates the general existing conditions at the time of the data collection. As such, it is only valid for its intended use, content, time, and accuracy specifications. The user is responsible for the results of any application of the data for other than its intended purpose. |
Data Use Constraints: |
None. However, users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of the limitations of the data. Acknowledgment of owner would be appreciated for products derived from these data. The data represented is the result of data collection and processing per contract specifications and indicates the general existing conditions at the time of the data collection. As such, it is only valid for its intended use, content, time, and accuracy specifications. The user is responsible for the results of any application of the data for other than its intended purpose. |
Distribution Information
Distribution 1
Start Date: | 2022-05-19 |
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End Date: | Present |
Download URL: | https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=10126/details/10126 |
Distributor: | NOAA Office for Coastal Management (NOAA/OCM) (2024 - Present) |
File Name: | Customized Download |
Description: |
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. |
File Type (Deprecated): | Zip |
Compression: | Zip |
Distribution 2
Start Date: | 2021 |
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End Date: | Present |
Download URL: | https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/AL_NorthAL_2019_B19/AL_NorthAL_2019/LAZ/ |
Distributor: | U.S. Geological Survey (2021 - Present) |
File Name: | Bulk Download |
Description: |
Bulk download of data files in LAZ format, based on a horizontal datum/projection of Albers Conic, NAD83(2011), meters (EPSG: 6350) and a vertical datum of NAVD88 (GEOID12B) and units in meters (EPSG: 5703). |
File Type (Deprecated): | LAZ |
Distribution Format: | LAS/LAZ - LASer |
URLs
URL 1
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
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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 2
URL: | https://s3-us-west-2.amazonaws.com/usgs-lidar-public/AL_NorthAL_2019/ept.json |
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Name: | Entwine Point Tiles (EPT) |
URL Type: |
Online Resource
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File Resource Format: | json |
Description: |
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. |
URL 3
URL: | https://usgs.entwine.io/data/view.html?r=%22https://s3-us-west-2.amazonaws.com/usgs-lidar-public/AL_NorthAL_2019%22 |
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Name: | USGS Potree 3D View |
URL Type: |
Online Resource
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Description: |
Link to view the point cloud (using the Entwine Point Tile (EPT) format) in the 3D Potree viewer. |
URL 4
URL: | https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/metadata/AL_NorthAL_2019_B19/AL_NorthAL_2019/ |
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Name: | USGS Additional Info |
URL Type: |
Online Resource
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Description: |
Link to the additional information available for this data set from the USGS. This information includes reports, tile index shapefiles, and hydro breaklines. |
URL 5
URL: | https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/metadata/AL_NorthAL_2019_B19/AL_NorthAL_2019_B19_WP_Report.pdf |
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Name: | USGS Project Report |
URL Type: |
Online Resource
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File Resource Format: | |
Description: |
Link to the USGS project report that provides project information, vertical accuracy results, classifications used, sensors used, and work unit information. |
URL 6
URL: | https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/metadata/AL_NorthAL_2019_B19/AL_NorthAL_2019/reports/North%20Alabama%20Project%20Report.pdf |
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Name: | Lidar Report |
URL Type: |
Online Resource
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File Resource Format: | |
Description: |
Link to the lidar report. |
Data Quality
Vertical Positional Accuracy: |
This data set was produced to meet ASPRS Positional Accuracy Standard for Digital Geospatial Data (2014) for a 10-cm RMSEz Vertical Accuracy Class. USGS Determined Vertical Accuracy Non-Vegetated Vertical Accuracy (NVA) = 3.9 cm RMSE Vegetated Vertical Accuracy (VVA) = 11.31 cm at the 95th Percentile
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Completeness Report: |
Area of interest covers project area. A visual qualitative assessment was performed to ensure data completeness. No void areas or missing data exist. The raw point cloud is of good quality and data passes NVA specifications. Void areas (i.e., areas outside the project boundary but within the tiling scheme) are coded using a unique NODATA value. This value is identified in the appropriate location within the file header. |
Conceptual Consistency: |
All lidar data and lidar derived data covers the entire area of interest. All lidar point cloud tiles show no edge artifacts or mismatches from tile to tile. Void areas (i.e. areas outside the project boundary but within the tiling scheme) are coded using a unique NODATA value. This value is identified in the appropriate location within the file header. Data cover the entire area specified for this project. |
Data Management
Have Resources for Management of these Data Been Identified?: | Yes |
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Approximate Percentage of Budget for these Data Devoted to Data Management: | Unknown |
Do these Data Comply with the Data Access Directive?: | Yes |
Actual or Planned Long-Term Data Archive Location: | NCEI-CO |
How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive?: |
Data is backed up to tape and to cloud storage. |
Lineage
Lineage Statement: |
The NOAA Office for Coastal Management (OCM) ingested references to the USGS Entwine Point Tiles (EPT) hosted on Amazon Web Services (AWS) into the Digital Coast Data Access Viewer (DAV). The DAV accesses the point cloud as it resides on AWS under the usgs-lidar-public-container. |
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Sources
USGS AWS Entwine Point Tile (EPT)
Contact Role Type: | Publisher |
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Contact Type: | Organization |
Contact Name: | USGS |
Citation URL: | https://s3-us-west-2.amazonaws.com/usgs-lidar-public/AL_NorthAL_2019/ept.json |
Citation URL Name: | USGS Entwine Point Tile (EPT) |
Process Steps
Process Step 1
Description: |
Aircraft and Sensor Information and Flight Plan Execution Atlantic acquired 54 passes of the AOI as a series of perpendicular and/or adjacent flight-lines executed in 5 flight missions conducted between December 4, 2019 and December 30, 2019. Onboard differential Global Navigation Satellite System (GNSS) unit(s) recorded sample aircraft positions at 2 hertz (Hz) or more frequency. LiDAR data was only acquired when a minimum of six (6) satellites were in view. |
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Process Date/Time: | 2019-10-30 00:00:00 |
Process Step 2
Description: |
Ground Control Survey A total of 161 ground survey points were collected in support of this project, including 32 LiDAR Control Points (LCP), 69 Non-vegetated Vertical Accuracy (NVA) and 60 Vegetated Vertical Accuracy (VVA). Point cloud data accuracy was tested against a Triangulated Irregular Network (TIN) constructed from LiDAR points in clear and open areas. A clear and open area can be characterized with respect to topographic and ground cover variation such that a minimum of five (5) times the Nominal Pulse Spacing (NPS) exists with less than 1/3 of the RMSEZ deviation from a low-slope plane. Slopes that exceed ten (10) percent were avoided. Each land cover type representing ten (10) percent or more of the total project area were tested and reported with a VVA. In land cover categories other than dense urban areas, the tested points did not have obstructions forty-five (45) degrees above the horizon to ensure a satisfactory TIN surface. The VVA value is provided as a target. It is understood that in areas of dense vegetation, swamps, or extremely difficult terrain, this value may be exceeded. The NVA value is a requirement that must be met, regardless of any allowed âÂÂbustsâ in the VVA(s) for individual land cover types within the project. Checkpoints for each assessment (NVA and VVA) are required to be well-distributed throughout the land cover type, for the entire project area. |
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Process Date/Time: | 2019-10-30 00:00:00 |
Process Step 3
Description: |
LiDAR Point Cloud Generation Atlantic used Leica software products to download the IPAS ABGNSS/IMU data and raw laser scan files from the airborne system. Waypoint Inertial Explorer is used to extract the raw IPAS ABGNSS/IMU data, which is further processed in combination with controlled base stations to provide the final Smoothed Best Estimate Trajectory (SBET) for each mission. The SBETs are combined with the raw laser scan files to export the LiDAR ASCII Standard (*.las) formatted swath point clouds. |
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Process Date/Time: | 2020-12-03 00:00:00 |
Process Step 4
Description: |
LiDAR Calibration Using a combination of GeoCue, TerraScan and TerraMatch; overlapping swath point clouds are corrected for any orientation or linear deviations to obtain the best fit swath-to-swath calibration. Relative calibration was evaluated using advanced plane-matching analysis and parameter corrections derived. This process was repeated interactively until residual errors between overlapping swaths, across all project missions, was reduced to âÃÂä2cm. A final analysis of the calibrated lidar is preformed using a TerraMatch tie line report for an overall statistical model of the project area. Upon completion of the data calibration, a complete set of elevation difference intensity rasters (dZ Orthos) are produced. A user-defined color ramp is applied depicting the offsets between overlapping swaths based on project specifications. The dZ orthos provide an opportunity to review the data calibration in a qualitative manner. Atlantic assigns green to all offset values that fall below the required RMSDz requirement of the project. A yellow color is assigned for offsets that fall between the RMSDz value and 1.5x of that value. Finally, red values are assigned to all values that fall beyond 1.5x of the RMSDz requirements of the project. |
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Process Date/Time: | 2020-12-03 00:00:00 |
Process Step 4
Description: |
LiDAR Classification Multiple automated filtering routines are applied to the calibrated LiDAR point cloud identifying and extracting bare-earth and above ground features. GeoCue, TerraScan, and TerraModeler software was used for the initial batch processing, visual inspection and any manual editing of the LiDAR point clouds. Atlantic utilized collected breakline data to preform classification for classes 9 (Water) and 20 (Ignored Ground). 1 Processed, but unclassified 2 Bare-earth ground 7 Low Noise 9 Water 17 Bridge Decks 18 High Noise 20 Ignored Ground (breakline proximity). |
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Process Date/Time: | 2020-12-03 00:00:00 |
Process Step 5
Description: |
Original point clouds in LAS/LAZ format were restructured as Entwine Point Tiles and stored on Amazon Web Services. The data were re-projected horizontally to WGS84 Web Mercator (EPSG 3857). Vertically, no changes were made to the vertical datum (NAVD88 GEOID12B; EPSG 5703). |
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Process Contact: | U.S. Geological Survey |
Process Step 6
Description: |
References to the entwine point tiles and data reports were ingested into the Digital Coast Data Access Viewer. No changes to the data were made at this point. The Data Access Viewer will access the point cloud as it resides on AWS under the usgs-lidar-public container. |
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Process Date/Time: | 2024-06-03 00:00:00 |
Process Contact: | Office for Coastal Management (OCM) |
Catalog Details
Catalog Item ID: | 72737 |
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GUID: | gov.noaa.nmfs.inport:72737 |
Metadata Record Created By: | Rebecca Mataosky |
Metadata Record Created: | 2024-06-03 20:54+0000 |
Metadata Record Last Modified By: | Rebecca Mataosky |
Metadata Record Last Modified: | 2024-06-07 19:49+0000 |
Metadata Record Published: | 2024-06-04 |
Owner Org: | OCMP |
Metadata Publication Status: | Published Externally |
Do Not Publish?: | N |
Metadata Last Review Date: | 2022-05-20 |
Metadata Review Frequency: | 1 Year |
Metadata Next Review Date: | 2023-05-20 |