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Short Citation:
OCM Partners, 2023: 2004 St. Johns County, Florida Lidar,

Item Identification

Title: 2004 St. Johns County, Florida Lidar
Short Name: fl2004_stjohns_m100_metadata
Status: Completed
Publication Date: 2004

This dataset is the bare earth lidar data for St. Johns County, Florida, acquired in early January and February of 2004.

This data was collected to develop comprehensive countywide base mapping and perform other GIS enhancements to

support master drainage planning, transportation planning, preliminary engineering and wetland preservation studies.

The surveyed area included all of St. Johns County, approximately 610 square miles. Eighty-seven (87) flight lines of

high density lidar data (average GSD is 3.3 feet) were obtained at an altitude of 3000 feet AGL. This data set contains

only model keypoints (points that are a thinned data set that is intended to remove extraneous data such as trees and

points that are deemed redundant to the final bare earth product) that are classified as ground points.

As a result, there are a lower number of points than in a full mass point lidar data set; and it is recommended that the

data be downloaded as points and used with a TIN (Triangulated Irregular Network) or similar algorithm to produce a

bare earth surface.

Original contact information:

Contact Name: Mike Campbell

Contact Org: St. Johns County Florida GIS

Title: St. Johns County GIS Manager

Phone: 904-209-0778



The purpose of this topographic lidar survey was to produce a digital terrain model (DTM) of sufficient density and

accuracy to generate 1-foot contours, compile limited planimetric features and generate panchromatic (black and white)

digital orthophoto imagery (DOI).



Supplemental Information:

The Minimum Technical Standard Report for St. Johns County, FL may be viewed at:


Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
None Surface
None Terrain

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
Distribution Liability:

Any conclusions drawn for the analysis of this information are not the responsibility of the St. Johns

County Public Works Department, the Office for Coastal Management, or its partners.

Data Set Credit: Acknowledgement of the St. Johns County Public Works Department would be appreciated in products derived from these data.

Support Roles

Data Steward

CC ID: 672418
Date Effective From: 2004
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


CC ID: 672420
Date Effective From: 2004
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Metadata Contact

CC ID: 672421
Date Effective From: 2004
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Point of Contact

CC ID: 672419
Date Effective From: 2004
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


Currentness Reference: Publication Date

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1132221
W° Bound: -81.669173
E° Bound: -81.212673
N° Bound: 30.259696
S° Bound: 29.621896

Extent Group 1 / Time Frame 1

CC ID: 1132220
Time Frame Type: Range
Start: 2004-01-17
End: 2004-02-07

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:;

Data Access Constraints:


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: 740721
Download URL:
File Name: Customized Download

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

Distribution 2

CC ID: 740722
Download URL:
File Name: Bulk Download

Simple download of data files.



CC ID: 740724
URL Type:
Online Resource


CC ID: 740725
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 672437
Activity Date/Time: 2016-05-23

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 672436
Activity Date/Time: 2017-11-14

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

Activity Log 3

CC ID: 718231
Activity Date/Time: 2018-02-08

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 740723
Activity Date/Time: 2018-03-13

Partial upload to move data access links to Distribution Info.

Data Quality

Horizontal Positional Accuracy:

Compiled to 1" to 100' scale

Vertical Positional Accuracy:

Based on the DTM Accuracy Analysis, the vertical accuracy of the DTM/TIN is 9.75 cm (0.32 feet) RMSE at the 1 sigma level

(+/- 19.2 cm (0.63 feet) at the 95% confidence level) for unobscured points.

Completeness Report:

Not provided

Conceptual Consistency:

Not provided



2004 St. Johns County, Florida Lidar

CC ID: 1132216
Publish Date: 2004-01-01
Extent Type: Range
Extent Start Date/Time: 2004-01-17
Extent End Date/Time: 2004-02-07
Source Contribution:

Unknown | Source Geospatial Form: Model | Type of Source Media: External hard drive

Process Steps

Process Step 1

CC ID: 1132217

The LiDAR data was acquired in 93 flight lines acquired in 6 sessions between January 17 and February 7, 2004

from an altitude of 3,000 feet above ground level (AGL) to provide an average ground sample distance (GSD) of 3.3 feet.

Three concurrent airborne GPS base stations were used for each acquisition session.

The ABGPS data were reduced using the GrafNav software package by Waypoint Consulting, Inc. The IMU data was reduced using the

PosProc software package by Applanix Corporation. The initial lidar "point cloud" was derived through the ALS Post Processor

software package by Leica Geosystems. The aircraft, lidar system and associated computer hardware and software are owned and

operated by Woolpert LLP.

Once the initial lidar "point cloud" was derived, Woolpert performed QC to look for any systematic error within the lidar

flights using proprietary software. After systematic error was identified and removed, the individual lidar flights were

clipped to remove overlap between adjacent flight lines and provide a homogeneous coverage over the project extents.

Using the homogeneous coverage, above ground features were classified and removed using proprietary software to produce

the bare-earth coverage.

Process Date/Time: 2004-01-01 00:00:00

Process Step 2

CC ID: 1132218

The NOAA Office for Coastal Management (OCM) received the files in ASCII format. The data was in Florida

State Plane Projection, NAVD88 vertical datum and the vertical units of measure were feet. OCM performed the following

processing to the data to make it available within Digital Coast:

1. The data were converted from Florida State Plane East, Zone 0901 coordinates to geographic coordinates.

2. The data were converted from NAVD88 (orthometric) heights to GRS80 (ellipsoid) heights using Geoid 03.

3. The vertical unit of measure for the data was converted from feet to meters.

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

Process Date/Time: 2008-11-03 00:00:00

Catalog Details

Catalog Item ID: 49682
GUID: gov.noaa.nmfs.inport:49682
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