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Short Citation:
OCM Partners, 2022: 2008 St. Johns County, FL Countywide Lidar, https://www.fisheries.noaa.gov/inport/item/49695.

Item Identification

Title: 2008 St. Johns County, FL Countywide Lidar
Short Name: fl2008_stjohns_m1119_metadata
Status: Completed
Publication Date: 2009-01-06
Abstract:

Airborne terrestrial LiDAR was collected for St. Johns County, FL. System Parameters/Flight Plan. The LiDAR system acquisition

parameters were developed based on a maximum average ground sample distance of 2.1 feet. A Leica ALS50 LiDAR sensor was used for acquisition.

Acquisition specifications for the sensor follows: Field of View (full angle) - 24 degrees, Nominal flight altitude (AGL) - 3000 feet,

Airspeed - 130 mph (113 knots), Laser pulse rate - 100,000 Hz, Nominal swath width (on ground) - 1275 feet, Maximum cross track point

spacing - 2.07 feet, Maximum along track point spacing - 4.30 feet, Average point spacing - 1.67 feet, Flight line spacing - 970.47 feet,

Side overlap - 23.91 percent. LiDAR System Calibration. Prior to the LiDAR acquisition, the system underwent a calibration to verify the

operational accuracy and misalignment angles. Boresight calibrations were performed for the LiDAR system at the beginning and end of each

flight mission. LiDAR Data Acquisition. LiDAR data acquisition only occurred when the sky was sufficiently clear of clouds, smoke, and

atmospheric haze. The LiDAR data was processed immediately after the acquisition to verify the coverage had no voids. GPS/Inertial Measurement

Unit (IMU) Post Processing. The GPS and IMU data was post processed using differential and kalman filter algorithms to derive a best estimate

of trajectory. The quality of the solution was verified to be consistent with the accuracy requirements of the project. LiDAR Processing and

Classification. The LiDAR data was post processed and verified to be consistent with the project requirements in terms of post spacing and

absence of artifacts. The point cloud underwent classification to determine bare-earth points (class 2), noise points (class 7), water

returns (class 9), and unclassified data (class 1). Class 12 contains LiDAR points removed from the overlap region between adjacent flight

lines.

Original contact information:

Contact Org: St. Johns County GIS Division

Phone: 904-209-0778

Email: gis@sjcfl.us

Purpose:

The DTM was developed to support the development and maintenance of the St. Johns County Countywide Digital Contour Mapping Project.

Notes:

10339

Supplemental Information:

Project Title- Countywide Digital Contour Mapping; Vendor Name- Woolpert, Inc.

The Final QA/QC Quantitative Assessment Report for this data set may be viewed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1119/supplemental/2008_StJohns_MTS_Final_Report_Lidar_Ortho.pdf

The Final Ground Control Survey Report (more detail given to field activities, process, etc.) may be viewed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1119/supplemental/2008_StJohns_MTS_Final_Report_Ground_Control.pdf

An additional Aerial Triangulation Report may be accessed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1119/supplemental/2008_StJohns_MTS_Final_Report_AerialTriangulation.pdf

A footprint of this data set may be viewed in Google Earth at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1119/supplemental/2008_St_Johns_County_FL_Countywide_Lidar.kmz

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation

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
Data Presentation Form: LAS
Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of the Office for Coastal Management

or its partners.

Support Roles

Data Steward

CC ID: 672863
Date Effective From: 2009-01-06
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: 672865
Date Effective From: 2009-01-06
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: 672866
Date Effective From: 2009-01-06
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: 672864
Date Effective From: 2009-01-06
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: 1132582
W° Bound: -81.669741
E° Bound: -81.212177
N° Bound: 30.253509
S° Bound: 29.621834

Extent Group 1 / Time Frame 1

CC ID: 1132574
Time Frame Type: Discrete
Start: 2008-02-14

Extent Group 1 / Time Frame 2

CC ID: 1132575
Time Frame Type: Discrete
Start: 2008-02-15

Extent Group 1 / Time Frame 3

CC ID: 1132576
Time Frame Type: Discrete
Start: 2008-02-16

Extent Group 1 / Time Frame 4

CC ID: 1132577
Time Frame Type: Discrete
Start: 2008-02-17

Extent Group 1 / Time Frame 5

CC ID: 1132578
Time Frame Type: Discrete
Start: 2008-02-19

Extent Group 1 / Time Frame 6

CC ID: 1132579
Time Frame Type: Discrete
Start: 2008-02-20

Extent Group 1 / Time Frame 7

CC ID: 1132580
Time Frame Type: Discrete
Start: 2008-02-21

Extent Group 1 / Time Frame 8

CC ID: 1132581
Time Frame Type: Discrete
Start: 2008-02-25

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Access Information

Security Class: Unclassified
Data Access Procedure:

This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer;

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.

Information from the St. Johns County Geographic Information System is provided for general reference purposes only and is not to be construed

as a survey or legal document. Errors from non-coincidence of features from different sources may be present. The St. Johns County Geographic

Information System makes every reasonable effort to ensure that the information provided herein is current and accurate. However, St. Johns

County provides no warranties, expressed or implied, concerning the accuracy, completeness, reliability, or suitability of this data for

any particular use or purpose. St. Johns County assumes no liability whatsoever associated with the use or misuse of such data.

Distribution Information

Distribution 1

CC ID: 740795
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=1119
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: 740796
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1119/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 740798
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 740799
URL: https://coast.noaa.gov
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 672888
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 672887
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: 718244
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 740797
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Technical Environment

Description:

Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog 9.2.0.1324

Data Quality

Horizontal Positional Accuracy:

Horizontal accuracy is +/- 3.8-foot at the 95% confidence level using RMSE(r) x 1.7308 as defined by the FGDC Geospatial Positional

Accuracy Standards, Part 3: NSSDA.

; Quantitative Value: 3.8 meters, Test that produced the value:

LiDAR system calibration is available in the MTS Report of Specific Purpose Survey.

Vertical Positional Accuracy:

Vertical accuracy is +/- 0.4-foot RMSE for unobscured ground points. The accuracy assessment was performed using a standard method to

compute the root mean square error (RMSE) based on a comparison of ground control points and filtered LiDAR data points. Filtered LiDAR

data has had vegetation and cultural features removed and by analysis represents bare earth elevations. The RMSE figure was used to compute

the vertical National Standard for Spatial Data Accuracy (NSSDA). The vertical accuracy of the 2-foot contours, with supplemental 1-foot

contours, is +/- 0.75 foot RMSE in unobscured areas.

; Quantitative Value: 0.4 meters, Test that produced the value:

The accuracy assessment was performed using a standard method to compute the root mean square error (RMSE) based on a comparison of ground

control points and filtered LiDAR data points. Results for this project are available in the MTS Report of Specific Purpose Survey.

Completeness Report:

This feature class represents the complete set of data for 797 5,000' x 5,000' tiles within St. Johns County.

Conceptual Consistency:

The LiDAR DTM was developed in accordance with St. Johns specifications.

Lineage

Sources

Countywide Digital Contour Mapping Project

CC ID: 1132570
Publish Date: 2008-06-30
Extent Type: Range
Extent Start Date/Time: 2008-02-14
Extent End Date/Time: 2008-02-25
Scale Denominator: 1200
Source Contribution:

Onboard Laser | Source Geospatial Form: model | Type of Source Media: disc

Process Steps

Process Step 1

CC ID: 1132571
Description:

Ground (class 2) LAS points were extracted in ArcMap, using a Woolpert Team-developed VB Script, and loaded into the MASSPOINTS feature

class for each area's Geodatabase as multipoint geometry.

Process Date/Time: 2008-01-06 00:00:00

Process Step 2

CC ID: 1132572
Description:

The NOAA Office for Coastal Management received the data in LAS format. The files contained Lidar elevation and intensity measurements. The data

were projected in State Plane coordinates (NAD83; Florida East) and referenced to the North American Vertical Datum of 1988 (NAVD88) using the Geoid03 model.

The following processes were performed to make the data available within the Digital Coast:

1. The data were converted from state plane (NAD83; Florida East) to geographic coordinates (NAD83).

2. The data were converted from NAVD88 (orthometric) heights to GRS80 (ellipsoidal) heights using the Geoid03 model.

3. The LAS data were sorted by latitude and the headers were updated.

Process Date/Time: 2011-11-15 00:00:00

Catalog Details

Catalog Item ID: 49695
GUID: gov.noaa.nmfs.inport:49695
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:21+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2022-03-16
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2022-03-16
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2023-03-16