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Data Set Info
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Spatial Info
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Data Quality
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Catalog Details

Summary

Short Citation
Office for Coastal Management, 2024: 2022 NOAA Topobathy Lidar DEM: Morro Bay, CA, https://www.fisheries.noaa.gov/inport/item/67998.
Full Citation Examples

Abstract

Morro Bay 2022 topobathymetric Lidar area data were collected by NV5 Geospatial (NV5) using a Riegl VQ880GII system. Morro Bay 2022 data acquisition occurred on 20220614 in two missions. The Morro Bay 2022 dataset includes topobathymetric data in a LAS format 1.4, point data record format 6, with the following classifications in accordance with project specifications and the American Society for Photogrammetry and Remote Sensing (ASPRS) classification standards:

1 - unclassified

1O - edge clip

2 - ground

7W - low noise

9 - NIR water surface

18W - high noise

40 - bathymetric bottom or submerged topography

41 - Green water surface

43 - Submerged object, not otherwise specified (For Morro Bay, oyster reefs have this classification, even though exposed at

low tide)

45 - water column

This data set also includes lidar intensity values, number of returns, return number, time, and scan angle. The 100 meter buffered project area covers approximately 4,215 acres along the south central Pacific Coast of California near the town of Los Osos. LAS files were compiled in 500 m x 500 m tiles clipped to the project boundary. The final classified Lidar data were used to create topobathymetric DEMs in GeoTIFF format with 1m pixel resolution. This delivery of the Morro Bay 2022 dataset represents an area covering 96 - 500 m x 500 m DEM tiles clipped to the project boundary. One tile (MRR22_088) did not have any valid bathymetric bottom or ground points and so it did not produce a valid dem. This Project was completed in partnership between NOAA OCM and the NEP.

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.

Distribution Information

  • 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.

  • GeoTIFF

    Bulk download of data files in the original coordinate system.

Access Constraints:

None

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.

Controlled Theme Keywords

COASTAL BATHYMETRY, COASTAL ELEVATION, DIGITAL ELEVATION/TERRAIN MODEL (DEM), 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

Geographic Area 1

-120.875211° W, -120.821145° E, 35.373531° N, 35.304796° S

Time Frame 1
2022-06-14

Item Identification

Title: 2022 NOAA Topobathy Lidar DEM: Morro Bay, CA
Short Name: ca2022_morro_dem_m9630_metadata
Status: Completed
Creation Date: 2022
Publication Date: 2022-08-30
Abstract:

Morro Bay 2022 topobathymetric Lidar area data were collected by NV5 Geospatial (NV5) using a Riegl VQ880GII system. Morro Bay 2022 data acquisition occurred on 20220614 in two missions. The Morro Bay 2022 dataset includes topobathymetric data in a LAS format 1.4, point data record format 6, with the following classifications in accordance with project specifications and the American Society for Photogrammetry and Remote Sensing (ASPRS) classification standards:

1 - unclassified

1O - edge clip

2 - ground

7W - low noise

9 - NIR water surface

18W - high noise

40 - bathymetric bottom or submerged topography

41 - Green water surface

43 - Submerged object, not otherwise specified (For Morro Bay, oyster reefs have this classification, even though exposed at

low tide)

45 - water column

This data set also includes lidar intensity values, number of returns, return number, time, and scan angle. The 100 meter buffered project area covers approximately 4,215 acres along the south central Pacific Coast of California near the town of Los Osos. LAS files were compiled in 500 m x 500 m tiles clipped to the project boundary. The final classified Lidar data were used to create topobathymetric DEMs in GeoTIFF format with 1m pixel resolution. This delivery of the Morro Bay 2022 dataset represents an area covering 96 - 500 m x 500 m DEM tiles clipped to the project boundary. One tile (MRR22_088) did not have any valid bathymetric bottom or ground points and so it did not produce a valid dem. This Project was completed in partnership between NOAA OCM and the NEP.

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.

Purpose:

This Project was completed in partnership between NOAA OCM and the NEP to collect topobathymetric Lidar for the Morro Bay, California project area.

Data was collected to aid NOAA in assessing the channel morphology and topobathymetric surface of the study area to support and inform coastal resource and watershed managers on decisions relating to theBuilding Climate Resilience and Improving Water Quality through Eelgrass Restoration in Morro Bay project. This project monitors eelgrass, which declined between 2007 and 2011. The decline of eelgrass led to increased sediment erosion and, therefore, an effort to replant more eelgrass. Many organisms such as otters are reliant on the eelgrass for either food or shelter. Otters play a key role in restoration efforts by removing grazers. The lidar data will assist in quantifying change in eel grass distribution over time as well as sediment transport and sea level rise.

Supplemental Information:

The Morro Bay 2022 data includes all Lidar returns. An automated grounding classification algorithm was used to determine bare earth and submerged topography point classification and was followed with manual editing. Bathymetric intensity values were normalized for water depth. Classes 2 (ground) and 40 (submerged topography) were used to create the final DEMs. The full workflow used for this project are documented in the Morro Bay 2022 Lidar technical report.

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > DIGITAL ELEVATION/TERRAIN MODEL (DEM)
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > BATHYMETRY > COASTAL BATHYMETRY
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION
ISO 19115 Topic Category
elevation

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA
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

Instrument Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Instrument Keywords
LIDAR > Light Detection and Ranging

Platform Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Platform Keywords
Airplane > Airplane

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Data Set Type: Elevation
Maintenance Frequency: None Planned
Data Presentation Form: Elevation Data
Distribution Liability:

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: We request that you credit the National Oceanic and Atmospheric Administration (NOAA) when you use these data in a report, publication, or presentation. Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office for Coastal Management (OCM)

Support Roles

Data Steward

CC ID: 1186775
Date Effective From: 2022
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

CC ID: 1186774
Date Effective From: 2022
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

Metadata Contact

CC ID: 1186776
Date Effective From: 2022
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

CC ID: 1186777
Date Effective From: 2022
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

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1298749
W° Bound: -120.875211
E° Bound: -120.821145
N° Bound: 35.373531
S° Bound: 35.304796

Extent Group 1 / Time Frame 1

CC ID: 1298748
Time Frame Type: Discrete
Start: 2022-06-14

Spatial Information

Spatial Representation

Representations Used

Grid: Yes

Reference Systems

Reference System 1

CC ID: 1298745

Coordinate Reference System

CRS Type: Vertical
EPSG Code: EPSG:5703
EPSG Name: NAVD88 height
See Full Coordinate Reference System Information

Reference System 2

CC ID: 1298746

Coordinate Reference System

CRS Type: Projected
EPSG Code: EPSG:6339
EPSG Name: NAD83(2011) / UTM zone 10N
See Full Coordinate Reference System Information

Access Information

Security Class: Unclassified
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.

Distribution Information

Distribution 1

CC ID: 1186780
Start Date: 2022-10-06
End Date: Present
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=9630/details/9630
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2022 - 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 Type (Deprecated): Zip
Compression: Zip

Distribution 2

CC ID: 1186781
Start Date: 2022-10-06
End Date: Present
Download URL: https://noaa-nos-coastal-lidar-pds.s3.us-east-1.amazonaws.com/dem/CA_Morro_Bay_DEM_2022_9630/index.html
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2022 - Present)
File Name: Bulk Download
Description:

Bulk download of data files in the original coordinate system.

File Type (Deprecated): GeoTIFF
Distribution Format: GeoTIFF

URLs

URL 1

CC ID: 1186772
URL: https://coast.noaa.gov/
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 2

CC ID: 1186773
URL: https://coast.noaa.gov/dataviewer/
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 3

CC ID: 1186800
URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=9629/details/9629
Name: Custom Point Download
URL Type:
Online Resource
File Resource Format: Zip
Description:

Link to custom download, from the Data Access Viewer (DAV), the lidar point data from which these raster Digital Elevation Model (DEM) data were created.

URL 4

CC ID: 1186801
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/9629/supplemental/Morro_Bay_Topobathymetric_Lidar_Report_2022_ADA_Rev2.pdf
Name: Lidar Report
URL Type:
Online Resource
File Resource Format: pdf
Description:

This lidar report provides accompanying information about the collection and processing of this lidar data set.

Data Quality

Horizontal Positional Accuracy:

Lidar horizontal accuracy is a function of Global Navigation Satellite System (GNSS) derived positional error, flying altitude, and INS derived attitude error. The obtained RMSEr value is multiplied by a conversion factor of 1.7308 to yield the horizontal component of the National Standards for Spatial Data Accuracy (NSSDA) reporting standard where a theoretical point will fall within the obtained radius 95 percent of the time (ACCr). Based on a flying altitude of 400 meters, an IMU error of 0.002 decimal degrees, and a GNSS positional error of 0.023 meters, the RMSEr value for the Morro Bay 2022 area is 0.034 meters, with a ACCr of 0.06 meters at the 95% confidence level. The project specification requires horizontal positions to be accurate to 1.22 m (RMSE).

Vertical Positional Accuracy:

Absolute accuracy was assessed using both Non-Vegetated Vertical Accuracy (NVA) survey methods. Survey checkpoints were evenly distributed as feasible throughout the project area. NVA compares known ground check point data that were withheld from the calibration and post-processing of the Lidar point cloud to the derived gridded bare earth DEM. NVA is a measure of the accuracy of Lidar point data in open areas with level slope (less than 20Â degrees) where the Lidar system has a high probability of measuring the ground surface and is evaluated at the 95% confidence interval (1.96*RMSE). In the Morro Bay 2022 project area, 21 survey checkpoints were used to assess the non-vegetated vertical accuracy. Project specifications require NVA meet 0.196 m accuracy at the 95% confidence interval. Ground check points located in land cover categories other than bare earth, urban, or submerged topography were used to compute the Vegetated Vertical Accuracy (VVA). No VVA points were collected or assessed for this project. The Morro Bay 2022 area dataset Non-Vegetated Vertical Accuracy tested 0.052 m vertical accuracy at 95% confidence level against the derived bare earth DEM in open terrain using 21 ground check points, based on RMSEz (0.026 m) x 1.9600. No VVA points were collected or assessed for this project.

Completeness Report:

Data covers the project Morro Bay 2022 boundary.

Conceptual Consistency:

Not applicable

Lineage

Lineage Statement:

NV5 Geospatial collected topobathy elevation data for the NOAA Office for Coastal Management (OCM) and the Morro Bay NEP (National Estuary Program). The data were processed to be available for custom download from the NOAA Digital Coast Data Access Viewer (DAV) and for bulk download from https.

Sources

NV5 Geospatial

CC ID: 1298740
Contact Role Type: Originator
Contact Type: Organization
Contact Name: NV5 Geospatial

Process Steps

Process Step 1

CC ID: 1298741
Description:

Data for the Morro Bay 2022 Topobathymetric Lidar project area was acquired by NV5 Geospatial (NV5) using Riegl VQ-880-GII topobathymetric Lidar systems. All derived DEM data is referenced to:

Horizontal Datum-NAD83(2011) epoch: 2010.00

Projection-UTM Zone 10N

Horizontal Units-meters

Vertical Datum-NAVD88 (Geoid12b)

Vertical Units-meters

The collected Lidar data were immediately processed by NV5 to a level that allowed QA/QC measures to determine if the sensor functioned properly and to assess the coverage of submerged topography. The initial files were inspected for sensor malfunctions and then passed through automated raster generation to develop an initial assessment of bathymetric coverage. NV5 reviewed all acquired flight lines to ensure complete coverage and positional accuracy of the laser points.

NV5 resolved kinematic corrections for aircraft position data in PosPac MMS 8.5 using aircraft GNSS and Applanix's proprietary PP-RTX solution. This was used to correct the continuous onboard measurements of the aircraft position recorded throughout the flight. A final smoothed best estimate trajectory (SBET) was developed, blending post-processed aircraft position with attitude data. Using the SBETs, sensor head position and attitude were then calculated throughout the survey.

Following final SBET creation, NV5 used RiUnite 1.0.1 to calculate laser point positioning by associating SBET positions to each laser point return time. The speed of light and its direction of travel is changed or refracted when entering the water column from air. A refraction correction was applied to account for this difference by adjusting the depth (distance traveled) and horizontal positioning (change of angle/direction) of all submerged points in the Lidar data. TerraSolid v19 and NV5's proprietary software LasMonkey were used to classify water surface points and derive water surface models. Separate models were created for each scanner of each collected swath to ensure temporal differences and wave or water surface height variations between flight lines were accurately accounted for when applying the refraction correction to the submerged data. These models, along with the Lidar points and the SBETs, were processed in LasMonkey's refraction tool to accurately adjust the positioning of bathymetric points. Using raster-based QC methods, the output data were verified to ensure the refraction tool functioned properly.

Once all submerged points were refracted by flight line, data were exported to LAS 1.4 format and combined into 500 m x 500 m tiles. NV5 used custom algorithms in Terrascan v19 to classify the initial ground/submerged topography surface points. Data were then further calibrated using StripAlign 2.1 based on classified hard surface areas of swath overlap. Relative accuracy was compared and verified through the use Delta-Z (DZ) orthos created using NV5's Las Product Creator. Absolute vertical accuracy of the calibrated data were assessed using ground survey data and complete coverage was again verified.

After a final automated classification, NV5 then performed manual editing to review all classification and improve the final topobathymetric surface. NV5's LasMonkey software was used to update LAS header information, including all projection and coordinate reference system information. The final Lidar data are in LAS format 1.4 and point data record format 6.

The final classification scheme is as follows:

1 - unclassified

1O - edge clip

2 - ground

7W - low noise

9 - NIR water surface

18W - high noise

40 - bathymetric bottom or submerged topography

41 - Green water surface

45 - water column

Process Date/Time: 2022-08-30 00:00:00

Process Step 2

CC ID: 1298742
Description:

The topobathymetric bare earth DEMs were output at 1 meter resolution in GeoTIFF format into 96 500 m x 500 m tiles. The Morro Bay 2022 rasters are clipped to the extent of the project boundary and named according to project specifications.

A bathymetric void shapefile was created to indicate areas where there was a lack of bathymetric returns. This shape was created by triangulating bathymetric bottom points with an edge length maximum of 4.56m to identify all areas greater then 9 square meters without bathymetric returns. This shapefile was used to clip and exclude interpolated elevation data from these areas in the bathymetric void clipped topobathymetric bare earth model.

Process Date/Time: 2022-08-30 00:00:00

Process Step 3

CC ID: 1298743
Description:

The NOAA Office for Coastal Management (OCM) received 96 digital elevation model (DEM) files in GeoTiff format from NV5 Geospatial. The bare earth raster files were at a 1 m grid spacing. The data were in UTM Zone 10N NAD83 (2011), meters coordinates and NAVD88 (Geoid12B) elevations in meters. OCM assigned the appropriate EPSG codes (Horiz - 6339, Vert - 5703) and copied the raster files to https for NOAA Digital Coast storage and provisioning purposes.

Process Date/Time: 2022-10-06 00:00:00
Process Contact: Office for Coastal Management (OCM)

Process Step 4

CC ID: 1298744
Description:

In February of 2023, NV5 Geospatial sent three replacement files for existing files. These files were:

1. MRR22_038

2. MRR22_046

3. MRR22_055

The point files that correspond to these DEM files were reclassed to include points that were changed from 1 - Unclassified to Class 43 - Submerged Object, not otherwise specified (For Morro Bay, oyster reefs have this classification, even though exposed at low tide). The new DEMs reflect that change. These files were processed to replace the existing files of the same name.

The NOAA Office for Coastal Management (OCM) received 3 digital elevation model (DEM) files in GeoTiff format from NV5 Geospatial. The bare earth raster files were at a 1 m grid spacing. The data were in UTM Zone 10N NAD83 (2011), meters coordinates and NAVD88 (Geoid12B) elevations in meters. OCM assigned the appropriate EPSG codes (Horiz - 6339, Vert - 5703) and copied the raster files to https for NOAA Digital Coast storage and provisioning purposes.

Process Date/Time: 2023-02-13 00:00:00
Process Contact: Office for Coastal Management (OCM)

Related Items

Item Type Relationship Type Title
Data Set (DS) Cross Reference 2022 NOAA Topobathy Lidar: Morro Bay, CA

Catalog Details

Catalog Item ID: 67998
GUID: gov.noaa.nmfs.inport:67998
Metadata Record Created By: Rebecca Mataosky
Metadata Record Created: 2022-10-06 20:25+0000
Metadata Record Last Modified By: Kirk Waters
Metadata Record Last Modified: 2024-01-10 19:28+0000
Metadata Record Published: 2024-01-10
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2022-10-07
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2023-10-07