2007 - 2008 Florida Division of Emergency Management (FDEM) Lidar Project: Blocks
1 - 10 (Southeast Florida and Keys)
The data were organized into 10 blocks. The 'block index' shapefile shows the extent
of each constituent block for the 2007 FDEM Southeast Florida and Florida Keys lidar
This Light Detection and Ranging (LiDAR) LAS dataset is a topographic survey conducted
for the State of Florida Division of Emergency Management LiDAR Project. These data
were produced for the Florida Division of Emergency Management. The LiDAR point cloud
was flown at a density sufficient to support a maximum final post spacing of 4 feet
for unobscured areas. 3001 Inc. acquired the data from July 12, 2007 through February
8, 2008. The data was divided into 5000' by 5000' cells that serve as the final tiling
scheme. The State of Florida Division of Emergency Management LiDAR Survey was collected
under the guidance of a Professional Mapper/Surveyor.
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
||Florida Division of Emergency Management (FDEM)
Lidar Dataset Supplemental Information
- Florida Division of Emergency Management (FDEM)
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
|| Not planned
||The State of Florida Division of Emergency Management LiDAR Project Survey data will
support the creation of Federal Emergency Management Agency Flood Insurance Rate Maps
(FEMA FIRM) and an integrated ground and surface water model. The State of Florida
Division of Emergency Management LiDAR Survey was collected under the guidance of
a Licensed and Professional Surveyor/Mapper.
||2007-07-12 to 2008-02-08
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- Stereo Photogrammetry
- LAS V.1.1 LiDAR
- St. Lucie County
- Martin County
- Palm Beach County
- Broward County
- Miami-Dade County
- Monroe County
- Florida Keys
- Key West
| Use Constraints
|| No constraint information available
|| Fee information not available.
|| Lineage statement not available.
- 3001 Inc.
- 3001 Inc.
- DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
| Processing Steps
- The Airborne Global Position System (ABGPS), inertial measurement unit (IMU), and
raw scans are collected during the LiDAR aerial survey. The ABGPS monitors the xyz
position of the sensor and the IMU monitors the orientation of the aircraft. During
the aerial survey laser pulses reflected from features on the surface and are detected
by the receiver optics and collected by the data logger. GPS locations are based on
data collected by receivers on the aircraft and base stations on the ground. The ground
base stations are placed no more than 20 km radius from the flight survey area.
- The ABGPS, IMU, and raw scans are integrated using proprietary software developed
by the Leica Geosystems and delivered with the Leica ALS50 System. The resultant file
is in a LAS binary file format. The LAS file version 1.1 format can be easily transferred
from one file format to another. It is a binary file format that maintains information
specific to the LiDAR data (return#, intensity value, xyz, etc.). The resultant points
are produced in the Florida State Plane East Zone coordinate system, with units in
feet and referenced to the NAD83/90 HARN horizontal datum and NAVD88 vertical datum.
- The unedited data are classified to facilitate the application of the appropriate
feature extraction filters. A combination of proprietary filters is applied as appropriate
for the production of bare-earth digital terrain models (DTMs). Interactive editing
methods are applied to those areas where it is inappropriate or impossible to use
the feature extraction filters, based upon the design criteria and/or limitations
of the relevant filters. These same feature extraction filters are used to produce
elevation height surfaces.
- Filtered and edited data are subjected to rigorous QA/QC according to the 3001 Inc.
Quality Control Plan and procedures. Very briefly, a series of quantitative and visual
procedures are employed to validate the accuracy and consistency of the filtered and
edited data. Ground control is established by 3001, Inc. and GPS-derived ground control
points (GCPs) points in various areas of dominant and prescribed land cover. These
points are coded according to landcover, surface material and ground control suitability.
A suitable number of points are selected for calculation of a statistically significant
accuracy assessment as per the requirements of the National Standard for Spatial Data
Accuracy. A spatial proximity analysis is used to select edited LiDAR data points
within a specified distance of the relevant GCPs. A search radius decision rule is
applied with consideration of terrain complexity, cumulative error and adequate sample
size. Accuracy validation and evaluation is accomplished using proprietary software
to apply relevant statistical routines for calculation of Root Mean Square Error (RMSE)
and the National Standard for Spatial Data Accuracy (NSSDA) according to Federal Geographic
Data Committee (FGDC) specifications.
- The LiDAR mass points were delivered in American Society for Photogrammetry and Remote
Sensing LAS 1.1 format. The header file for each dataset is complete as define by
the LAS 1.1 specification. In addition the following fields are included: Flight Date
Julian, Year, and Class. The data were classified as follows: Class 1 = Unclassified-
this class includes vegetation, buildings, noise etc.; Class 2 = Ground; Class 7 =
Noise; Class 9 = Water; Class 12 = Overlap. The datasets were delivered in the 5000'
by 5000' tiling scheme. The tiles are suitable for seamless topographic data mosaics
that include no "no data" areas. The names of the tiles are left padded with zeros
as required to achieve a six character length and all files utilize the LAS file extension.
- The NOAA Coastal Services Center (CSC) received files in LAS format. The files contained
LiDAR intensity and elevation measurements. CSC performed the following processing
on the data to make it available within Digital Coast: 1. The data were converted
from State Plane Florida West coordinates to geographic coordinates. 2. The data were
converted from NAVD88 heights to ellipsoid heights using Geoid03. 3. The LAS header
fields were sorted by latitude and updated.
- The NOAA National Geophysical Data Center (NGDC) received lidar data files via ftp
transfer from the NOAA Coastal Services Center. The data are
currently being served via NOAA CSC Digital Coast at http://www.csc.noaa.gov/digitalcoast/.
The data can be used to re-populate the system. The data are archived in LAS
or LAZ format. The LAS format is an industry standard for LiDAR data developed by
the American Society of Photogrammetry and Remote Sensing (ASPRS); LAZ is a loseless
compressed version of LAS developed by Martin Isenburg (http://www.laszip.org/). The
data are exclusively in geographic coordinates (either NAD83 or ITRF94). The data
are referenced vertically to the ellipsoid (either GRS80 or ITRF94), allowing for
the ability to apply the most up to date geoid model when transforming to orthometric
Metadata Last Modified: 2013-06-07
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