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Short Citation:
OCM Partners, 2022: 2007 Southwest Florida Water Management District (SWFWMD) LiDAR: Hillsborough/Little Manatee Districts, https://www.fisheries.noaa.gov/inport/item/50020.

Item Identification

Title: 2007 Southwest Florida Water Management District (SWFWMD) LiDAR: Hillsborough/Little Manatee Districts
Short Name: swfwmd_hillsborough_m79_metadata
Status: Completed
Publication Date: 2008-01-01
Abstract:

EarthData International collected ADS-50 derived LiDAR over a portion of Hillsborough and Manatee Counties with

a one meter post spacing. The period of collection was between 12 January and 20 January 2007. The collection was performed by

EarthData Aviation, using a Leica ALS-50 LiDAR system, including an inertial measuring unit (IMU) and a dual frequency GPS

receiver. This project required eleven lifts of flight lines be collected. The product generated consisted of LiDAR bare earth

elevation models in LAS format. This data set is one component of a digital terrain model (DTM) for the Southwest Florida Water

Management District's FY 2007 Hillsborough County - Watershed Management Plan Topographic Information Mapping (L762) and FY 2007

Little Manatee River Watershed Management Plan (L604), encompassing approximately 453 square miles in Hillsborough County and 82

square miles in Manatee County. The 2007 LiDAR data set is comprised of 3-D mass points delivered in the LAS file format based

upon the District's 5,000' x 5,000' grid with 505 cells in the Hillsborough area with an additional 91 cells in the Little

Manatee area. An additional 12 cells were added to the Hillsborough area. The other DTM component is 2-D and 3-D breakline

features in the ESRI ArcGIS Personal Geodatabase format. The breaklines were collected using Aerial photography captured for

the Southwest Florida Water Management District FY 2007 Digital Orthophoto (B089) Central District One-foot Orthophoto project.

The stream breaklines were the corrected to the hillshade LiDAR data. Contours (2-foot) were generated from the DTM that meet

the National Standard for Spatial Data Accuracy (NSSDA) for 2-foot contours (FEMA specifications). Bare earth LiDAR mass point

data display a vertical accuracy of at least 0.3-feet root mean square (RMSE) in open and unobscured areas with standard

reflective quality.

Original contact information:

Contact Name: Mapping and GIS section

Contact Org: Southwest Florida Water Management District

Phone: 352.796.7211

Purpose:

This project was designed to provide topographic information to the Southwest Florida Water Management District to

support regulatory, land management and acquisition, planning, engineering and habitat restoration projects.

Notes:

10664

Supplemental Information:

LiDAR bare-earth elevation models in LAS format.

The Hillsborough County Report of Topographic Survey Report may be viewed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/79/supplemental/index.html

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation
UNCONTROLLED
None Bare Earth
None Surface
None Terrain

Spatial Keywords

Thesaurus Keyword
UNCONTROLLED
Geographic Names Information System Florida
Geographic Names Information System Hillsborough County
Geographic Names Information System Manatee County
Geographic Names Information System Southwest Florida
Geographic Names Information System US

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: None Planned
Distribution Liability:

Any conclusions drawn for the analysis of this information are not the responsibility of the Southwest

Florida Water Management District (SWFWMD), the Office for Coastal Management, or its partners.

Data Set Credit: Southwest Florida Water Management District

Support Roles

Data Steward

CC ID: 687297
Date Effective From: 2008-01-01
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: 687299
Date Effective From: 2008-01-01
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: 687300
Date Effective From: 2008-01-01
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: 687298
Date Effective From: 2008-01-01
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: 1140411
W° Bound: -82.407173
E° Bound: -82.065375
N° Bound: 28.185085
S° Bound: 27.634385

Extent Group 1 / Time Frame 1

CC ID: 1140410
Time Frame Type: Range
Start: 2007-01-12
End: 2007-01-20

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Access Information

Security Class: Unclassified
Security Classification System:

None

Security Handling Description:

None

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.

Metadata Access Constraints:

None

Metadata Use Constraints:

This data is not valid without the signed and sealed Florida MTS Report of Specific Purpose Survey,

FY2007 Hillsborough County Watershed Management Plan Topographic Information Mapping (L762) Refer to this report for user

constraints.

Distribution Information

Distribution 1

CC ID: 742637
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=79
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: 742638
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/79/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 742640
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 742641
URL: https://coast.noaa.gov
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 687318
Activity Date/Time: 2017-03-20
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 687317
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: 718622
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 742639
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Technical Environment

Description:

Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 9.0.0.535

Data Quality

Accuracy:

The bore sight of the LiDAR was processed against the ground control for this project which consisted

of 41 LiDAR ground survey points and 1 ABGPS base station at the operation airport. The control points were processed to FL State

Plane West NAD83/1999, and vertically to Mean Sea Level (MSL), NAVD 88 in U.S. Survey Feet. Airborne GPS data was collected

during the acquisition mission for each flight line. During the data acquisition the Positional Dilution of Precision (PDOP)

for the airborne GPS (ABGPS) was monitored and held at or below 3.5 when possible. The control points were measured by

technicians using Terrascan and proprietary software and applied to the bore sight solution for the project lines. An

independent check of the accuracy of the bare earth LiDAR product was conducted using land cover quality control points.

Horizontal Positional Accuracy:

The minimum expected horizontal accuracy was tested to meet or exceed a 1.37 m (4.5 ft)

horizontal accuracy at 95 percent confidence level using RMSE(r) x 1.7308 as defined by the National Standards for Spatial

Data Accuracy (NSSDA).

Vertical Positional Accuracy:

The vertical accuracy for LiDAR data over well-defined surfaces meets the Federal Geographic

Data Committee's (FGDC) published National Standard for Spatial Data Accuracy (NSSDA). Vertical accuracies at the 95 percent

confidence level for flat terrain were required, and all systematic errors were eliminated to the greatest extent possible and

the errors were normally distributed. Accuracy was tested to meet a 14.94 cm (0.5 ft) fundamental vertical accuracy at 95

percent confidence level using RMSE (z) x 1.9600 as defined by the National Standards for Spatial Data Accuracy (NSSDA).

Completeness Measure:

Cloud Cover: 0

Completeness Report:

The following methods are used to assure LiDAR accuracy.

1. Use of IMU and ground control network utilizing GPS techniques.

2. Use of airborne GPS in conjunction with the acquisition of LiDAR.

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

The following software is used for the validation:

1. Terrascan

2. EarthData Proprietary Software

Conceptual Consistency:

Compliance with the accuracy standard was ensured by the collection of GPS ground control after the

acquisition of aerial LiDAR and the establishment of a GPS base station at the Sarasota-Bradenton International Airport. The

following checks were performed.

1. The ground control and airborne GPS data stream were validated through a fully analytical bore sight adjustment.

2. The DTM (Digital Terrain Model) data were checked against the project control.

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

Lineage

Sources

Hillsborough Little Manatee Aerial Acquisition

CC ID: 1140402
Publish Date: 2007-01-20
Extent Type: Range
Extent Start Date/Time: 2007-01-12
Extent End Date/Time: 2007-01-20
Scale Denominator: 1200
Source Contribution:

EarthData International collected ALS-50-derived LiDAR over Upper Myakka Florida with a one-meter post

spacing using aircraft number N2636P. The period of collection was between 12 January and 2o January 2007. The collection

was performed by EarthData Aviation, using a Leica ALS-50 LiDAR system, serial number ALS036, including an inertial measuring

unit (IMU) and a dual frequency GPS receiver. This project required eleven lifts of flight lines to be collected. The lines

were flown at an average of 3400 feet above mean terrain using a pulse rate of 75,000 pulses per second.

| Source Geospatial Form: Remote-sensing image | Type of Source Media: External hard drive

Report of GPS Survey Hillsborough and Little Manatee River Basin, FL

CC ID: 1140403
Publish Date: 2007-02-18
Extent Type: Range
Extent Start Date/Time: 2006-01-14
Extent End Date/Time: 2007-03-13
Scale Denominator: 1200
Source Contribution:

For a previous SWFWMD project (Upper Myakka) EarthData subcontracted the ground survey tasks to Kevin J.

Chappell, Florida PSM License No. LS5818. Points that fell within the Hillsborough Little Manatee project area were

incorporated as ground control points along with newly acquired points. The Global Positioning System (GPS) was used to

establish the control network. There were a total of 41 stations occupied for this project. There were 19 new photo control

stations, 11 new LIDAR control stations, 4 temporary GPS base stations, 5 existing NSRS control stations, 1 CORS station,

and 1 airborne GPS base station used by the flight crew. The final network was adjusted using least squares. A free adjustment

and constrained adjustment were performed. The results of the free adjustment indicate an external network accuracy of better

than 3 cm in relation to NAD 1983 1999 and NAVD 1988. The results of the constrained adjustment indicate an internal network

accuracy of better than 3 cm in relation to NAD 1983 1999 and NAVD 1988. Additionally, there were a total of 17 stations

occupied for this project. There were 9 new LIDAR control stations for Little Manatee and 32 points for Hillsborough, and 1

CORS station, and 1 airborne GPS base station used by the flight crew. The final network was adjusted using least squares.

A free adjustment and constrained adjustment were performed. The results of the free adjustment indicate an external network

accuracy of better than 3 cm in relation to NAD 1983 1999 and NAVD 1988. The results of the constrained adjustment indicate

an internal network accuracy of better than 3 cm in relation to NAD 1983 1999 and NAVD 1988. Eighty LiDAR QC points, broken

down into four sets of urban, bare und, brush and forest were collected. A full survey control report has been provided to

SWFWMD.

| Source Geospatial Form: Diagram | Type of Source Media: Paper

Process Steps

Process Step 1

CC ID: 1140404
Description:

The airborne GPS data were processed and integrated with the IMU. The results were imported into the

processing system for use in the LiDAR bore sight. The raw LiDAR data was downloaded onto a production server. The ground

control and airport GPS base station were used in conjunction with the processed ABGPS results for the LiDAR bore sight.

The properly formatted processing results were used for subsequent processing.

Process Date/Time: 2007-03-27 00:00:00

Process Step 2

CC ID: 1140405
Description:

EarthData has developed a unique method for processing LiDAR data to identify and remove elevation points

falling on vegetation, buildings, and other aboveground structures. The algorithms for filtering data were utilized within

EarthData's proprietary software and commercial software written by TerraSolid. This software suite of tools provides

efficient processing for small to large-scale, projects and has been incorporated into ISO 9001 compliant production work flows.

The following is a step-by-step breakdown of the process. Lidar editing workflow process for 2007 SWFWMD

1.Initial Lidar classification - initial classification is performed by separating the last return points and other return

points into different files. Only last return points will be used in Bare Earth editing. This step is accomplished during

pre-processing phase. The First of Many and intermediate returns will be merged back with last returns after Bare Earth Editing

and QC is completed for point cloud deliverables.

2. Lidar editing - the Lidar Last Return is edited to bare earth using a combination of automated and manual filtering

techniques. Existing orthophotography over the project area will be used as a reference to ensure that the editor is correctly

classifying points in areas that are either heavily vegetated or ambiguous in nature. Each tile will be individually edited

to make sure noise and vegetation points have been reclassified properly.

3. QC of Lidar classification - immediately following Lidar Editing, QC is performed to verify that points are correctly

classified. Each tile will be individually viewed and will be checked for consistent point density for each classification

and land cover type. For example, consistent density in marsh areas and open fields will be verified. Each tile will be checked

to make sure noise and vegetation points have been removed. Areas of heavy vegetation will be reviewed in profile to ensure

redundant check. An overall QC of the entire project area will be done in blocks of tiles to ensure consistency between tiles.

4. Breaklines - photogrametrically-collected breaklines will be compiled to delineate specified features in accordance with the

project scope. This is an interactive process using photogrametrically-derived stereo pairs in a 3D environment. Features

typically collected would define tops and bottoms of slopes, roads, ditches, ponds, rivers and lakes. Breaklines in wetland

areas will be collected with sufficient detail to ensure that hydrographic features are correctly represented to support

generation of 1' contours to the 2' vertical accuracy requirement. The wetland breaklines will be collected as closed polygons

and will be used in Step 8 for reclassifying wetland points.

Process Date/Time: 2007-05-14 00:00:00

Process Step 3

CC ID: 1140406
Description:

5. QC of breaklines - breaklines will be verified in a stereo environment by senior technicians who were not involved in the

compilation. Wetland boundaries will be verified using existing orthophotography and lidar hill shades color-coded by elevation.

This process will be used to ensure that water conditions at time of lidar acquisition were consistent with the imagery used to

compile breaklines. If there are any significant discrepancies, breaklines will be modified as necessary.

6. Streams are verified against Lidar hill shades to more accurately locate and define the path.

7. Breakline draping - following this QC step, breaklines will be draped to the lidar ground points. This will include roads

but will exclude ditches. All vector data is reviewed after this process to assure that vectors have been properly assigned

elevations in comparison to the lidar surface.

8. Reclassification - lidar points in wetlands and along ditches will be reclassified to Class 10. Islands in water Class 10

is a new classification not defined in the SWFWMD scope of work.

9. Final lidar QC - a TIN surface will be generated from lidar ground points and breaklines for a final QC. This step will

ensure that the terrain is consistent and there are no anomalies present.

10. Formatting - the final lidar tiles will be formatted for delivery. The edited Lidar Last return points and the First of

Many and Intermediate return points are merged together to complete the Point Cloud deliverable. This step will also include

the restoration of header information that is removed during processing using Terrascan software. In order to restore this

data and provide SWFWMD-required information, EarthData has written a program to ensure the proper data is added to the file

header.

11. Deliverables - Breakline Geodatabase deliverable files are created. Contours are generated, a visual QC of contours is

performed, and the geodatabase deliverable is created.

Process Date/Time: 2007-05-14 00:00:00

Process Step 4

CC ID: 1140407
Description:

Contour Creation after the Lidar is refined to the Bare Earth surface this surface was combined with 2D

photogrametrically collected and draped to the Lidar surface to establish an elevation on the breakline. The breakline location

was also observed in relation to where the lidar indicated terrain breaks. In areas that were obscured, such as dense

vegetation, the lidar data took precedence. As a general rule the lidar data took precedence. After the breaklines and lidar

data were reconciled to each other the data was hydrologically enforced to make sure that the flow on the streams was down hill.

MicroStation is then used to generate the contours. The contours are created at 1 foot with a 2 foot specification. After the

contours are created they are then reviewed for accuracy and consistency. After the review is completed the contours are

translated into an ESRI geodatabase for delivery.

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

Process Step 5

CC ID: 1140408
Description:

The NOAA Office for Coastal Management (OCM) received the files in LAS format. The files contained Lidar

intensity and elevation measurements. The data was in Florida State Plane Projection and NAVD88 vertical datum. OCM

performed the following processing to the data to make it available within the Digital Coast Data Access Viewer (DAV):

1. The data were converted from Florida State Plane West Zone 0902 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.

4. Vertical unit of measure converted from feet to meters.

Process Date/Time: 2008-04-28 00:00:00

Catalog Details

Catalog Item ID: 50020
GUID: gov.noaa.nmfs.inport:50020
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:23+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