2011 SWFWMD Topographic Lidar: Hillsborough County

SWFWMD regularly uses digital topographic information to support regulatory, land management and acquisition, planning, engineering and habitat restoration projects. LiDAR data will support hydrologic modeling activities associated with the Federal Emergency Management Agency (FEMA), and in the creation of Digital Flood Insurance Rate Maps(DFIRM). The LiDAR data will support the creation of Federal Emergency Management Agency Flood Insurance Rate Maps (FEMA FIRM) and an integrated ground and surface water model for Hillsborough County. The data were classified into 7 classifications; (1) unclassified, (2) ground, (6) buildings, (9) water, (11) wetlands (reclassed by OCM to 16), (12) overlap points, (23) reserved for ASPRS definition (reclassed by OCM to 15), (30) reserved for ASPRS definition, and (31) reserved for ASPRS definition (reclassed by OCM to 10). Cooner & Associates performed the vertical accuracy and horizontal accuracy QA/QC analysis.

The purpose of this project is to provide professional surveying and LiDAR services to the SWFWMD for the creation of a high-resolution digital elevation model for a 286 Square mile area of interest (AOI) in Hillsborough County, Florida(based on a 5,000-ft by 5,000-ft tiling scheme). The project area is shown in the graphic above and required 106 flight lines flown at 5,500' ASL.

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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/geoid18/4698/supplemental/fl2011_swfwmd_hillsborough_m4698.kmz

A report for this dataset is available at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/4698/supplemental/fl2011_swfwmd_hillsborough_m4698_surveyreport.pdf

Lidar points in LAZ format (Classes 1,2,6,9,10,12,15,16)

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Any conclusions drawn from the analysis of this information are not the responsibility of SWFWMD, Photo Science, 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=4698;

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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be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions.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. These data depict the heights at the time of the survey and are only accurate for that time.

These data are not attributed.

The scope stated that horizontal accuracies for the LiDAR data sets should meet or exceed a verified horizontal accuracy of 1.158 meters at the 95% confidence interval (0.671 meters RMSE) as specified in the FGDC Geospatial Positioning Accuracy Standards, Part 3: National Standard for Spatial Data Accuracy (NSSDA). A minimum of thirty independent checkpoints within the project area were used for verification.; Quantitative Value: 1.158 meters, Test that produced the value: +/- 115.8 cm, 2 sigma

The scope also defined the Fundamental Vertical Accuracy (FVA) at meeting or exceeding 0.183 meters at 95% confidence level (0.0914 meter RMSE) in open well defined terrain. A minimum of thirty check points for each land cover category will be checked (Urban; Bare Ground/Short Grass; and Brush). Supplemental Vertical Accuracy (SVA) shall meet or exceed 0.363 meters (0.192 meter RMSE) with a minimum of thirty check points in the following land cover types, (Wet Prairies and Pine Flatwoods). Finally the Consolidated Vertical Accuracy (CVA) shall not exceed the above accuracy requirements when all the values are tested as a combined QC check.; Quantitative Value: 0.080 meters, Test that produced the value: 8.0 cm RMSEz

This data set covers the spatial extent of topographic lidar data obtained during this survey.

Data covers the tile scheme provided for the county and was verified for correct topology. Hydro connectivity, monotonicity and vertical consistency of the breaklines was validated.