Short Citation:
OCM Partners, 2020: 2009 - 2011 CA Coastal Conservancy Coastal Lidar Project: Hydro-flattened Bare Earth DEM, https://www.fisheries.noaa.gov/inport/item/49415.

Item Identification

Title: 2009 - 2011 CA Coastal Conservancy Coastal Lidar Project: Hydro-flattened Bare Earth DEM
Short Name: ca2010_coastal_dem
Status: Completed
Publication Date: 2012
Abstract:

Light Detection and Ranging (LiDAR) data is remotely sensed high-resolution elevation data collected by an airborne collection

platform. This LiDAR dataset is a survey of Coastal California. The project area consists of approximately 2616 square miles.

The project design of the LiDAR data acquisition was developed to support a nominal post spacing of 1 meter. Fugro EarthData,

Inc. acquired 1546 flight lines in 108 lifts between October 2009 and August 2011. LiDAR data collection was performed with two

Piper Navajo twin engine aircrafts, utilizing a Leica ALS60 MPiA sensor; collecting multiple return x, y, and z as well as

intensity data. The bare-earth lidar data was used to create hydro-flattened DEMs (Digital Elevation Models) available for

download from the NOAA OCM Digital Coast.

Original contact information:

Contact Org: NOAA Office for Coastal Management

Phone: 843-740-1202

Email: coastal.info@noaa.gov

Purpose:

These digital data are intended to support the local coastal zone managers in their decision-making processes, including applications such

as sea level rise.

Notes:

12078

Supplemental Information:

The information in this report is the result of LiDAR surveys performed on the date indicated and the general conditions at the time of

flight.

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords Earth Science > Land Surface > Topography > Terrain Elevation > Topographical Relief Maps
Global Change Master Directory (GCMD) Science Keywords Earth Science > Oceans > Coastal Processes > Coastal Elevation
ISO 19115 Topic Category elevation
Keywords Bare Earth
Keywords Bathymetry/Topography
Keywords DEM
Keywords Elevation
Keywords LiDAR
Keywords Model
Keywords Surface
Keywords Terrain

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords Continent > North America > United States Of America > California
None California
None United States

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: As Needed
Entity Attribute Overview:

Leica ALS60 MPiA sensor; 1m nominal post spacing

Entity Attribute Detail Citation:

see process steps within this record

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: Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office for Coastal Management (OCM); the California State Coastal Conservancy (SCC) Ocean Protection Council (OPC); Scripps Institution of Oceanography; and the Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX).

Support Roles

Data Steward

CC ID: 661299
Date Effective From: 2012
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: 661301
Date Effective From: 2012
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: 661302
Date Effective From: 2012
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: 661300
Date Effective From: 2012
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: Publication Date

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 661305
W° Bound: -124.44374
E° Bound: -116.267734
N° Bound: 42.012737
S° Bound: 32.521695

Extent Group 1 / Time Frame 1

CC ID: 661304
Time Frame Type: Range
Start: 2009-09
End: 2011-10

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Access Information

Security Class: Unclassified
Security Classification System:

None

Security Handling Description:

N/A

Data Access Procedure:

This data can be obtained on-line at the following URL:

https://coast.noaa.gov/dataviewer/

This data set is dynamically generated based on user-specified parameters.

;

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: 720760
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=1131
Distributor:
File Name: Customized Download
Description:

Create custom data files by choosing data area, product type, map projection, file format, datum, etc.

Distribution 2

CC ID: 720759
Download URL: https://coast.noaa.gov/htdata/raster2/elevation/California_Lidar_DEM_2009_1131
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 720762
URL: https://coast.noaa.gov/dataviewer/
URL Type:
Online Resource

URL 2

CC ID: 720763
URL: https://coast.noaa.gov
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 661321
Activity Date/Time: 2016-07-14
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 661320
Activity Date/Time: 2017-11-14
Description:

Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 718183
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 720761
Activity Date/Time: 2018-02-13
Description:

Partial upload to move data access links to Distribution Info.

Technical Environment

Description:

Microsoft Windows XP Version 5.1 (Build 2600) Service

Pack 2; ESRI ArcCatalog 9.2.6.1500

Data Quality

Accuracy:

During LiDAR data collection the airborne GPS receiver was collecting data at 2 Hz frequency and the Dilution of Precision (PDOP) was

monitored. One GPS base station was also running at the operation airport and was recording data at 1 Hz. The airborne GPS data was

post-processed in DGPS mode together with the base station data to provide high accuracy aircraft positions. The GPS trajectory then was

combined with the IMU data using loosely coupled approach to yield high accuracy aircraft positions and attitude angles. Then the LiDAR

data was processed using the aircraft trajectory and raw LiDAR data. After boresighting the LiDAR data, the ground control points were

measured against the LiDAR data by technicians using TerraScan and proprietary software and the LiDAR data was adjusted vertically to

the ground control. Independent ground control check points were used to ensure vertical accuracy of the data. The horizontal datum

for the control was the North American Datum of 1983 (NAD83, NSRS2007).The vertical datum was the North American Vertical Datum of

1988 (NAVD88). The vertical datum was realized through the use of the published/calculated ellipsoidal heights of the base station to

process the aircraft trajectory and then later applying the GEOID09 model to the processed LiDAR data to obtain orthometric heights.

Horizontal Positional Accuracy:

The minimum expected horizontal accuracy was tested to meet or exceed the National Standard for Spatial Data Accuracy (NSSDA).

Horizontal accuracy is 50 cm RMSE or better.

Vertical Positional Accuracy:

The minimum expected vertical accuracy was tested to meet or exceed the National Standard for Spatial Data Accuracy (NSSDA).

When compared to GPS survey grade points in generally flat, non-vegetated areas, at least 95% of the positions had an error less

than or equal to 9.4 cm (equivalent to root mean square error (rmse) of 4.8 cm if errors were normally distributed).

Completeness Measure:

Cloud Cover: 0

Completeness Report:

The following methods are used to ensure LiDAR data accuracy:

1) Use of a ground control network utilizing GPS survey techniques;

2) Use of airborne GPS and IMU in conjunction with the acquisition of LiDAR; and

3) Measurement of quality control ground survey points within the finished product.

The following software is used for the validation: 1) Terrascan and 2) Fugro EarthData Proprietary Software.

Conceptual Consistency:

Compliance with the accuracy standard was ensured by the collection of ground control and the establishment of a GPS base station at the

operation airport. The following checks were performed:

1) The LiDAR data accuracy was validated by performing a full boresight adjustment and then checking it against the ground control prior

to generating a digital terrain model (DTM) or other products.

2) LiDAR elevation data was validated through an inspection of edge matching and visual inspection for quality (artifact removal).

Lineage

Sources

Aerial Acquisition of Coastal California LiDAR

CC ID: 661288
Contact Name: Fugro EarthData, Inc.
Publish Date: 2011-08-04
Extent Type: Range
Extent Start Date/Time: 2009-10-15
Extent End Date/Time: 2011-08-02
Source Contribution:

Fugro EarthData, Inc. collected ALS60-derived LiDAR over Coastal California with a 1 meter, nominal post spacing

using two Piper Navajo twin engine aircrafts. The collection for the entire project area was accomplished between October 2009 and

August 2011; 1,546 flight lines were acquired in 108 lifts. The lines were flown at an average of 6,244 feet above mean terrain

using a pulse rate of 121,300 pulses per second. The collection was performed using Leica ALS60 MPiA LiDAR systems, serial

numbers 113 and 142.

| Type of Source Media: External hard drive

Coastal California LiDAR; Classified LiDAR Point Cloud Data

CC ID: 661290
Contact Name: Fugro EarthData, Inc.
Publish Date: 2011-10-20
Extent Type: Discrete
Extent Start Date/Time: 2011-10-20
Source Contribution:

Fugro EarthData, Inc. utilized commercial software as well as proprietary software for automatic filtering of

LiDAR data to identify and re-classify elevation points falling on vegetation, building, and other above ground structures into

separate data layers. The parameters used in the process were customized for each terrain type to obtain optimum results. Once

the automated filtering was completed, the files were run through a visual inspection to ensure that the filtering was not too

aggressive or not aggressive enough. In cases where the filtering was too aggressive and important terrain features were filtered

out, the data was either run through a different filter or was corrected during the manual filtering process. Interactive editing

was then completed in 3D visualization software which also provides manual and automatic point classification tools using

commercial and proprietary software for the process. Vegetation and artifacts remaining after automatic data post-processing were

reclassified manually through interactive editing. The hard edges of ground features that were automatically filtered out during

the automatic filtering process were brought back into ground class during manual editing. The technician then reviewed the LiDAR

points with color shaded TINs for anomalies in ground class during interactive filtering. Upon the completion of bare earth

filtering and peer review process, the classified LiDAR point cloud work tiles went through a water classification routine based

on the collected water polygons. Upon the completion of finalization of the classified LiDAR point cloud work tiles, the topographic

LiDAR classified point cloud data that was produced under the JALBTCX and NOAA OCM programs was merged. The final classified

LiDAR point data were packaged to NAD83 (NSRS2007), UTM zones 10 and 11 north, meters; NAVD88, meters, using GEOID09 and cut to

the approved tile layout and project boundary in LAS format.

| Type of Source Media: Internal net

Report of Survey California Coast Ground Control for LiDAR

CC ID: 661289
Contact Name: TerraSurv
Publish Date: 2010-11-17
Extent Type: Range
Extent Start Date/Time: 2009-09-25
Extent End Date/Time: 2010-10-21
Source Contribution:

TerraSurv under contract to Fugro EarthData, Inc. successfully established ground control for Coastal California

LiDAR. A total of 307 ground control points were acquired. GPS was used to establish the control network. The horizontal datum was

the North American Datum of 1983 (NAD83, NSRS2007). The vertical datum was the North American Vertical Datum of 1988 (NAVD88).

| Type of Source Media: electronic mail system

Process Steps

Process Step 1

CC ID: 661291
Description:

The hydro-enforced bare earth DEM was generated using the bare earth points, as well as the 3D hydro breaklines. The following is

a step-by-step breakdown of the process:

1) After the deliverable LAS files were generated for the entire project area and QC'ed, and the 3D breaklines were collected and

QC'ed, they were used to produce the hydro-enforced bare earth DEM. The bare earth points that fell within 1*NPS along the hydro

breaklines were taken out of from Ground class so that these points were excluded from the DEM generation process. This process

was done in batch mode using Fugro EarthData's proprietary software.

2) Inland ponds and lakes, inland streams and rivers, and tidal water bodies were hydro-flattened within the DEM. Hydro-flattening

was applied to water impoundments, natural or man-made, larger than ~2 acres in area (inland ponds and lakes larger than 1 acre

were collected for the 500 meter corridor); to streams nominally wider than 100' (inland streams and rivers wider than 15 meters

were collected for the 500 meter corridor); and to tidal waters bodies, which includes any significant water body that is

affected by tidal variations.

3) The hydro-flattened bare earth DEM generated in initial grid format was then clipped to the approved DEM product boundary.

4) After the hydro-flattened bare earth DEM was clipped to the boundary, the technician checked the tiles to ensure that the grid

spacing met specifications and checked the surface to ensure proper hydro-flattening. The data was cut to the approved tile

layout. The entire data set was checked for complete project coverage and to ensure it was free of anomalies.

5) The hydro-flattened bare earth DEM was then converted to the delivery ESRI Grid format.

Process Date/Time: 2011-11-15 00:00:00
Source: Coastal California LiDAR; Classified LiDAR Point Cloud Data

Catalog Details

Catalog Item ID: 49415
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:13+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2019-07-02 15:17+0000
Metadata Record Published: 2018-02-13
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2019-02-14