2018 - 2020 FDEM Lidar: Florida Peninsular

Product: This project was designed to acquire and produce QL1 lidar data to support the Florida Division of Emergency Management (FDEM) "Florida Statewide Lidar" initiative. These lidar data are processed Classified LAS 1.4 files, formatted to individual 5000 ft x 5000 ft tiles; used to create intensity images, 3D breaklines, and hydro-flattened DEMs as necessary.

Geographic Extent: The project area covers peninsular Florida. When complete, a total of 39,217 tiles will be produced for the project, providing approximately 34,950 sq. miles of coverage.

Dataset Description: The Florida Peninsular project called for the planning, acquisition, processing, and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.35 meters. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base LiDAR Specification, Version 1.3. The data were developed based on a horizontal projection/datum of NAD83(2011) / Florida North/East/West (ftUS), Foot US and vertical datum of NAVD88 GEOID12B, Foot US. LiDAR data were delivered as processed Classified LAS 1.4 files formatted to individual 5000 ft x 5000 ft tiles, as tiled intensity imagery, and as tiled bare earth DEMs; all tiled to the same 5000 ft x 5000 ft schema. Continuous breaklines were produced in Esri file geodatabase format.

Ground Conditions: LiDAR was collected in 2018, 2019 and 2020, while no snow was on the ground and rivers were at or below normal levels. In order to post process the LiDAR data to meet task order specifications and meet ASPRS vertical accuracy guidelines ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. Additional independent accuracy checkpoints were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.

The NOAA Office for Coastal Management (OCM) downloaded data sets from this USGS site:

ftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/

The data sets downloaded were:

FL_Peninsular_FDEM_2018_D19_DRRA/FL_Peninsular_FDEM_Collier_2018/ Number of files: 530

FL_Peninsular_FDEM_2018_D19_DRRA/FL_Peninsular_FDEM_KeyBiscayne_2020/ Number of files: 14

FL_Peninsular_FDEM_2018_D19_DRRA/FL_Peninsular_FDEM_Nassau_2018/ Number of files: 763

These files were processed to the Data Access Viewer (DAV) and https. Additional areas will be downloaded, processed, and added to this data set as they are made available from USGS. The areas currently available from the DAV have the following coverage:

Collier County - 475 square miles

Key Biscayne (in Miami-Dade County) - 5 square miles

Nassau County - 684 square miles

Hydro breaklines are also available. These data are available for download at the link provided in the URL section of this metadata record. Please note that these products have not been reviewed by the NOAA Office for Coastal Management (OCM) and any conclusions drawn from the analysis of this information are not the responsibility of NOAA or OCM.

To acquire detailed surface elevation data for use in conservation planning, design, research, floodplain mapping, dam safety assessments and elevation modeling, etc. Classified LAS files are used to show the manually reviewed bare earth surface. This allows the user to create intensity images, breaklines and raster DEMs. The purpose of these LiDAR data was to produce high accuracy 3D hydro-flattened digital elevation models (DEMs) with a 2.5 feet cell size. These raw LiDAR point cloud data were used to create classified LiDAR LAS files, intensity images, 3D breaklines, and hydro-flattened DEMs as necessary.

Contract No. G16PC00016, Task Order No. 140G0218F0443; CONTRACTOR: Quantum Spatial, Inc.

The following are the USGS lidar fields in JSON:

{

"ldrinfo" : {

"ldrspec" : "USGS-NGP Base Specification v1.3",

"ldrsens" : "Leica ALS 80",

"ldrmaxnr" : "unlimited",

"ldrnps" : "0.316",

"ldrdens" : "10.0",

"ldranps" : "0.309",

"ldradens" : "10.47",

"ldrfltht" : "1400",

"ldrfltsp" : "150",

"ldrscana" : "20",

"ldrscanr" : "52",

"ldrpulsr" : "585",

"ldrpulsd" : "2.5",

"ldrpulsw" : "0.31",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.22",

"ldrswatw" : "1019.0",

"ldrswato" : "60",

"ldrgeoid" : "GEOID12B",

"ldrcrs" : "NAD83(2011) / Florida East (ftUS), Foot US"

},

"ldraccur" : {

"ldrchacc" : "0",

"rawnva" : "0",

"rawnvan" : "0",

"clsnva" : "0",

"clsnvan" : "0",

"clsvva" : "0",

"clsvvan" : "0"

},

"lasinfo" : {

"lasver" : "1.4",

"lasprf" : "6",

"laswheld" : "Withheld (ignore) points were identified in these files using the standard LAS Withheld bit.",

"lasolap" : "Swath "overage" points were not classified in these files.",

"lasintr" : "16",

"lasclass" : {

"clascode" : "1",

"clasitem" : "Processed, but Unclassified"

},

"lasclass" : {

"clascode" : "2",

"clasitem" : "Bare-Earth Ground"

},

"lasclass" : {

"clascode" : "6",

"clasitem" : "Buildings"

},

"lasclass" : {

"clascode" : "7",

"clasitem" : "Low Noise"

},

"lasclass" : {

"clascode" : "9",

"clasitem" : "Water"

},

"lasclass" : {

"clascode" : "17",

"clasitem" : "Bridge Decks"

},

"lasclass" : {

"clascode" : "18",

"clasitem" : "High Noise"

},

"lasclass" : {

"clascode" : "20",

"clasitem" : "Ignored Ground"

}

}}

Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners.

Data is available online for bulk and custom downloads.

None

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.

MicroStation Version 8; TerraScan Version 18; TerraModeler Version 18; GeoCue Version 2017.1.14.1; Esri ArcGIS 10.3; Global Mapper 19; Leica Cloud Pro 1.2.4; Windows 10 Operating System

\\point_cloud\tilecls\*.las

The project specifications require that only Non-Vegetated Vertical Accuracy (NVA) be computed for raw lidar point cloud swath files. The required accuracy (ACCz) is: 19.6 cm (0.64 ft) at a 95% confidence level, derived according to NSSDA, i.e., based on RMSE of 10 cm (0.33 ft) in the “bare earth” and "urban" land cover classes. The checkpoints were distributed throughout the project area and were surveyed using GPS techniques. Elevations from the unclassified lidar surface were measured for the x,y location of each check point. Elevations interpolated from the lidar surface were then compared to the elevation values of the surveyed control points. AccuracyZ has been tested to meet 19.6 cm (0.64 ft) or better Non-Vegetated Vertical Accuracy at 95% confidence level using RMSE(z) x 1.9600 as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASRPS Guidelines.

Collier County

Vendor determined value: Not provided

USGS determined value: Awaiting absolute vertical accuracy assessment

Key Biscayne (Miami-Dade County)

Vendor determined value: Not provided

USGS determined value: Awaiting absolute vertical accuracy assessment

Nassau County

Vendor determined value: Not provided

USGS determined value: Awaiting absolute vertical accuracy assessment

These LAS data files include all data points collected. No points have been removed or excluded. A visual qualitative assessment was performed to ensure data completeness. No void areas or missing data exist. The raw point cloud is of good quality and the data pass Non-Vegetated Vertical Accuracy specifications.

Data cover the entire area specified for this project.

Data is backed up to tape and to cloud storage.

The lidar data were collected for the Florida Department of Emergency Management (FDEM) and provided to the USGS. The NOAA Office for Coastal Management (OCM) downloaded the data from the USGS rockyftp site and processed the data for download from the Data Access Viewer (DAV) and from https.