2005 Southwest Florida Water Management District (SWFWMD) LiDAR: Weeki Wachee

This data set is one component of a digital terrain model (DTM) for Weeki Wachee, Hernando County,

Florida encompassing approximately 13.5 square miles. This dataset is comprised of 15 LiDAR files,

based on the DISTRICT 5,000' by 5,000' sheet index system, in the LAS file format. The raw data was

collected on 1 March 2005 at an average ground sample distance of 1-meter. Other components of the

DTM include: 3-D breaklines along hydrographic features in the Shape file format; lake/pond polygons

(in 3D) in the shape file format; obscured area polygons (in 2D) in the Shape file format;

and hard/soft breaklines (in 3D) in the Shape file format.

Original contact information:

Contact Name: Diana Burdick

Contact Org: Southwest Florida Water Management District

Title: GIS Analyst

Phone: 352-540-6018

Email: Diana.Burdick@swfwmd.state.fl.us

The DTM was developed to support the DISTRICT's regulatory, land management and acquisition,

planning, engineering, and habitat restoration projects

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2545/supplemental/fl2005_swfwmd_weekiwachee.kmz

Any conclusions drawn from the analysis of this information are not the responsibility

of Kucera International, ARC, USGS, NOAA, the Office for Coastal Management or its partners.

This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2545

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

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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. DTM accuracy specifications are valid only within the Hernando County limits. The user is cautioned that any DTM data

falling outside of the Hernando County limits may not meet the accuracy specifications.

Features detected in the elevation map are consistent with features on digital orthophotographs that meet National Map Accuracy Standards at a scale of 1:1200. The horizontal and vertical accuracy requirements of this project were: 3.8-feet (95% confidence level) horizontal and 0.59-feet (95% confidence level) vertical. Tested 1.1 m (3.6-feet) horizontal accuracy at the 95% confidence level.; Quantitative Value: 1.09 meters, Test that produced the value:

Tested 1.09 horizontal accuracy at the 95% confidence level. Horizontal accuracy was

tested by comparison of photo identifiable field survey ground truth QC test points (6 points total) against the corresponding

position with the digital orthophoto imagery. One hundred percent (100%) met the NMAS accuracy criteria for 1:1200 mapping.

Unobscured and obscured points were tested by field survey QC test points.

Thirty (30) total points were captured randomly across the project extents. The horizontal and vertical

accuracy requirements of this project were: 3.8-feet (95% confidence level) horizontal and 0.1798 (95%

confidence level) vertical.

; Quantitative Value: 0.1189 meters, Test that produced the value:

Vertical accuracy was tested by elevation comparison of field survey ground

truth QC test points (30 points total) against the corresponding position within the TIN derived from the DTM. One

point (1) did not meet the 95th percentile criteria.

All elevation measurements within the bounding coordinates of this XML were used to derive

this dataset. This map data is not complete without a signed and sealed Minimum Technical Standards Report of

Specific Purpose Survey: Weeki Wachee LiDAR Project, Hernando County, Florida dated January 6, 2006. Refer to

this document for use constraints.

Unobscured and obscured points were tested by field survey QC test points. Thirty (30)

total points were captured randomly across the project extents. The horizontal and vertical accuracy requirements

of this project were: 3.8-feet (95% confidence level) horizontal and 0.59-feet (95% confidence level) vertical.