2006 Southwest Florida Water Management District (SWFWMD) Lidar: North District

This data set is one component of a digital terrain model (DTM) for the Southwest Florida Water Management District's

FY2006 Digital Orthophoto (B089) and LiDAR Project (L470/L471), encompassing approximately 1,216 square miles across

Citrus and Sumter counties. The 2006 LiDAR dataset is comprised of 3-D masspoints delivered in the LAS file format

based on the District's 5,000' by 5,000' grid (1,356 cells). The other DTM component is 2-D and 3-D breakline features

in the ESRI ArcGIS Personal Geodatabase format. In accordance with the 2006 SWFWMD Topographic Database Design,

the following breakline features are contained within the database: closed water bodies (lakes, reservoirs, etc)

as 3-D polygons; linear hydrographic features (streams, canals, swales, embankments, etc) as 3-D breaklines;

coastal shorelines as 3-D linear features; edge of pavement road features as 3-D breakines; soft features

(ridges, valleys, etc.) as 3-D breaklines; obscured vegetation polygons as 2-D polygons; overpasses and bridges

as 3-D breaklines; 1-foot contours for visualization purposes; and island features as 3-D polygons. This data falls

in Citrus and Sumter Counties.

Intensity values, or the measure of reflectance of the laser are also captured.

Breakline features were captured to develop a hydrologically correct DTM. Contours (1-foot) were generated from

the DTM that meet the National Map Accuracy Standards for 2-foot contours (FEMA specifications). Bare earth LiDAR

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

Original contact information:

Contact Name: Mapping and GIS Section

Contact Org: Southwest Florida Water Management District

Phone: 352.796.7211

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

engineering, and habitat restoration projects

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Project Title: FY2006 Digital Orthophoto (B089) and LiDAR Project (L470/L471)

Purchase Order: 06PCSOW0471

Work Order Name: North District Ortho and LiDAR - Work Order 1

Vendor Name: Woolpert, Inc

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

responsibility of the Office for Coastal Management or it's partners.

This data can be obtained on-line at the following URL:

https://coast.noaa.gov/dataviewer

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Users should be aware that temporal changes may have occurred since this data 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 it's limitations.

The intended hroizontal accuracy is consistent with features on digital

orthophotographs that meet National Map Accuracy Standards at a scale of 1:1200. 3.6 feet horizontal

accuracy at the 95% confidence level, not tested.

The intended vertical accuracy of this project is 0.59-feet (95% confidence level) vertical.

RMSE= 0.3 feet for unobscured points, not tested.

Cloud Cover: 0

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

The LiDAR DTM was developed in accordance with the 2006 SWFWMD LiDAR specifications.

The DTM is intended to support 2-foot contours, and the vertical accuracy of ground points in unobscured areas

is 0.3-feet RMSE.