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Short Citation:
OCM Partners, 2022: 2005 St. Johns River Water Management District (SJRWMD) Lidar: Western Seminole County, Florida, https://www.fisheries.noaa.gov/inport/item/49685.

Item Identification

Title: 2005 St. Johns River Water Management District (SJRWMD) Lidar: Western Seminole County, Florida
Short Name: fl2005_seminole_m101_metadata
Status: Completed
Publication Date: 2005-08
Abstract:

This data set consists of a bare earth data set of 498 files covering a geographic area of 175 square miles in

western Seminole County, Florida and includes small portions of adjacent Orange and Lake Counties. The lidar data was

collected June 5-7, 2005. This data set seems to contain 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: Paul Finer

Contact Org: St. Johns River Water Management District (SJRWMD)

Phone: 386-329-4542

Email: gis_support@sjrwmd.com

Purpose:

This data set depicts information about geographic features within the project area and is to be used for purposes

defined by the SJRWMD.

Notes:

10329

Supplemental Information:

The Consolidated, Fundamental and Supplemental Vertical Accuracy Reports and the Photogrammetric

Survey and Map Report may be viewed at: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/101/supplemental/index.html

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation
UNCONTROLLED
None ASCII
None Bare earth
None Intensity image

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: Unknown
Distribution Liability:

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

River Water Management District (SJRWMD), the Office for Coastal Management, or its partners.

Data Set Credit: St. Johns River Water Management District (SJRWMD)

Support Roles

Data Steward

CC ID: 672523
Date Effective From: 2005-08
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: 672525
Date Effective From: 2005-08
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: 672526
Date Effective From: 2005-08
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: 672524
Date Effective From: 2005-08
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: 1132231
W° Bound: -81.486743
E° Bound: -81.240467
N° Bound: 28.875263
S° Bound: 28.639242

Extent Group 1 / Time Frame 1

CC ID: 1132230
Time Frame Type: Range
Start: 2005-06-05
End: 2005-06-07

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: 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.

Distribution Information

Distribution 1

CC ID: 740738
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=101
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: 740739
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/101/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 740741
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 740742
URL: https://coast.noaa.gov
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 672544
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 672543
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: 718234
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 740740
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

Horizontal Positional Accuracy:

The LiDAR data was compiled to meet a 7.6-foot horizontal accuracy at 95-percent confidence level. Due to the coarse nature

of the LiDAR data no comparisons could be made between the intensity returns and the horizontal positions of field surveyed

points. Project planning for high resolution LiDAR data and proven system performance were used to determine the expected

horizontal accuracy.

Final map data are referenced to the Florida High Accuracy Reference Network (HARN) adjustment for the North American Datum

of 1983. Projection was Universal Transverse Mercator (UTM), Zone 17, units were meters.

Vertical Positional Accuracy:

The LiDAR data was tested for a fundamental vertical accuracy and a supplemental vertical accuracy. The fundamental accuracy was

tested for points that fall in open areas, not obscured by vegetation, having a normalized distribution. The supplemental

accuracy was tested for points that fall in areas of vegetation, where data does not follow a normalized distribution.

The fundamental vertical accuracy was tested 0.56-foot vertical accuracy at 95 percent confidence level using RMSE procedures

with no outliers. The vertical root mean square error (RMSEz) was tested at 0.29-foot. The fundamental vertical accuracy meets

the National Standards for Spatial Data Accuracy (NSSDA) for one-foot contours. These results were determined by comparing

thirty-nine (39) field surveyed points obtained on hard surface and open areas with the Bald Earth Last Return LiDAR data.

Refer to file 05680_fundamental_vert_acc.xls to view the results including summary statistics, normalized distribution, and a

histogram.

The supplemental vertical accuracy was tested 1.29-feet vertical accuracy at 95 percent confidence level, determined by

the 95th percentile method. Point M3 having a -1.94 feet difference was determined to be an outlier. These results were

determined by comparing forty (40) field-surveyed points obtained in brush and forested areas with the Bald Earth Last

Return LiDAR data. Refer to file 05680_supplemental_vert_acc.xls to view the results including summary statistics,

normalized distribution, and a histogram. Another analysis of the data will be made after the manual edit of the LiDAR data

that may change these results.

Ground control surveys were conducted under the supervision of a licensed Florida Surveyor and Mapper in accordance with

Florida State Statutes. Horizontal values were referenced to the Florida High Accuracy Reference Network (HARN) adjustment

for the North American Datum of 1983. Projection was Universal Transverse Mercator (UTM), Zone 17, units were meters. Vertical

values were referenced to North American Vertical Datum of 1988 (NAVD88) units were feet. GPS and conventional

survey methodology was used to generate the values of the surveyed points located throughout the project area.

Completeness Report:

Not provided

Conceptual Consistency:

Not provided

Lineage

Process Steps

Process Step 1

CC ID: 1132226
Description:

LiDAR Data Acquisition -- The Lidar data was collected utilizing an Optech ALTM (Airborne Laser Terrain Mapper) 2025 in

a Cessna 208 Grand Caravan aircraft on June 5, 2005 between 0930 and 1150 hours at an altitude of 3000' AGL. Data was also

collected starting June 6, 2005 at 1830 hours and ending on June 7 at 0900 hours. The configuration used a scan half-angle

of +/-17 degrees, a laser pulse repetition frequency of 25 kilohertz, and a flying speed of approximately 80 knots.

Airborne GPS using a Novatel dual frequency GPS receiver was accomplished during the flight session to provide positional

information for the Lidar platform. Simultaneous acquisition of ground base station data was performed using a Novatel

and Leica SR9500 dual frequency receivers for the June 5, 2005 session. Two Leica SR9500 dual frequency GPS receivers were

used for the second session on June 6-7, 2005. Each station remained in operation for the duration of the project flight.

The ground base stations were set up over National Geodetic Survey (NGS) monuments AK0205 (Designation Number I4 71 A14)

and AK7045 (Designation Number GIS 0472 CAS 1). Positional information on these monuments was obtained from Data Sheets

retrieved from the NGS website (http://www.ngs.noaa.gov).

The GPS data from the ground base stations and the airborne platform were processed together using Applanix POSPac 4.2

software module POSGPS. All adjustments were referenced to WGS84.

The Inertial Measurement Unit (IMU) solution was accomplished to provide information regarding the attitude of the Lidar

platform using the Applanix POSPac 4.2 software module POSProc. This solution was integrated with the Airborne GPS and

adjusted using a Kalman filter in a forward/reverse solution to provide a Smoothed Best Estimate of Trajectory (SBET).

Laser ranging from the airborne platform was accomplished using Realm 3.2 processing software to provide XYZ ground positions

for each point.

The final horizontal values were output in Universal Transverse Mercator (UTM), Zone 17, units are meters. The horizontal

datum conforms to the current Florida High Accuracy Reference Network (HARN) adjustment for the North American Datum of 1983.

The Vertical Datum is the North American Vertical Datum of 1988 (NAVD88), units are feet.

Process Date/Time: 2005-06-07 00:00:00

Process Step 2

CC ID: 1132227
Description:

Classification of the laser data to extract above ground features such as buildings and vegetation

leaving only bare earth ground points was performed using Terrasolid Ltd. Terrascan software (Version 003.003). The data

was separated into five (5) separate sets 502 files representing Bald Earth First Pulse, Bald Earth Last Pulse, Extracted

Features First Pulse, Extracted Features Last Pulse, and LAS format. The Bald Earth Last Pulse best represents the natural

ground and is the file upon which all accuracy statements are based. The Extracted Features First Pulse best represents the

canopy data that includes all features determined to be above the natural ground.

Process Date/Time: 2005-07-01 00:00:00

Process Step 3

CC ID: 1132228
Description:

The NOAA Office for Coastal Management (OCM) received the bare earth files in ASCII format. The data were

Universal Transverse Mercator (UTM), Zone 17, units in meters, NAVD88 vertical datum and the vertical units of measure

were feet. OCM performed the following processing to the ASCII data to make it available within Digital Coast:

1. The data were converted from UTM coordinates to geographic coordinates.

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

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

Process Date/Time: 2008-11-14 00:00:00

Catalog Details

Catalog Item ID: 49685
GUID: gov.noaa.nmfs.inport:49685
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