Florida Division of Emergency Management
2008
Unknown
CONTOUR_1FT
vector digital data
CONTOUR_1FT
withheld
Lidar generated contours for Florida Division of Emergency Management.
Contours consistent with the deliverables and including a certain level of smoothing. Index, Intermediate, Depression, Supplementary and Low confidence contours are coded.
A complete description of this dataset is available in the Minimum Technical Standard ( MTS report) "Final Report OF Specific Purpose LiDAR Survey - LiDAR-Generated Breaklines and Contours" submited to Florida Division of Emergency Management.
en
2007
ground condition
As needed
-82.071058
-81.422698
30.838123
30.270836
319999.993000
522736.477000
2160000.000500
2364999.999500
None
Breakline
DTM
DSM
Contour
Elevation
Lidargrammetry
Lidar
None
Florida
Nassau County
United States
This data may be used by the requested party for stated purposes and should not be re-distributed.
This data is for planning purposes only and should not be used for legal or cadastral purposes. Regional Evacuation Studies are currently being updated and www.floridadisaster.org/gis should be consulted for revisions.
Florida DEM
mailing and physical address
2555 Shumard Oak Boulevard
Tallahassee
FL
32399-2100
USA
850-413-9907
850-488-1016
gis@dca.state.fl.us
ESRI ArcCatalog 9.3.1.1850
File Geodatabase Feature Class
Data covers the tile scheme provided for the county and was verified for correct topology (no intersection, overlap or dangles). Dewberry performed a full qualitative review of the contour data for smoothness and consistency of feature codes.
A visual qualitative assessment was performed to ensure the data completness against the intensity images derived from Lidar points. No void or missing data.
The 3D breaklines inherit the accuracy of the Lidar stereopairs it was acquired from.
Lidar source compiled to meet 1m horizontal accuracy.
1 meter
The PDS team does not perform independent horizontal accuracy testing on the LiDAR. LiDAR vendors perform calibrations on the LiDAR sensor and compare data to adjoing flight lines to ensure LiDAR meets the 1 meter horizontal accuracy standard at the 95% confidence level.
The 3D breaklines inherit the accuracy of the Lidar stereopairs it was acquired from.
0.60 feet
Based on the vertical accuracy testing conducted by PDS, using NSSDA and FEMA guidelines, vertical accuracy at the 95% confidence level (called Accuracyz) is computed by the formula RMSEz x 1.9600. The dataset for Nassau County, Florida satisfies the criteria:
Countywide lidar dataset tested .60 feet vertical accuracy at 95% confidence level in open terrain, based on open terrain RMSEz (.31') x 1.9600.
Countywide lidar dataset tested .98 feet vertical accuracy at 95% confidence level in all land cover categories combined, based on consolidated RMSEz (.50') x 1.9600.
Terrapoint USA
2007
Unknown
Lidar
vector digital data
LiDAR Survey of Nassau County, Florida, conducted in 2007 in support of the Florida Division of Emergency Management (FDEM).
online
2007
ground condition
Lidar
LiDAR dataset was used to create intensity stereopairs for 3D breakline compilation.
The ABGPS, IMU, and raw Optech 3100ea LiDAR scans are integrated using Optech Incorporated's DASHMap, version 1.1 software, Terrascan software and Microstation software. 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 referenced to the NAD83 horizontal datum and GRS80 vertical datum. The date and time for each flight line can be determined using the Julian date and time. The Julian date is a continuous count of days and fractions since noon Universal Time on January 1, 4713 BCE on the Julian Calendar.
withheld
withheld
withheld
2008
withheld
Terrapoint USA
LiDAR Manager
mailing and physical address
251216 Grogan's Park Drive
The Woodlands
Texas
77380
USA
1-877-999-7687
1-281-296-0869
peggy.cobb@terrapoint.com
Monday to Friday, 8 - 5, CST
The unedited data are classified to facilitate the application of the appropriate feature extraction filters. A combination of proprietary filters are 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. 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 (Precision reported in brackets): Class (Integer); GPS Week Time (0.0001 seconds); Easting (0.01 meter); Northing (0.01 meter);
Elevation (0.01 meter); Echo Number (Integer 1 to 4); Echo (Integer 1 to 4); Intensity (8 Bit Integer);
Flightline (Integer); Scan Angle (Integer Degree). The LAS files do not include overlap. The data was classified as follows:
Class 1 = Unclassified. This class includes vegetation, buildings, noise etc.
Class 2 = Ground
Class 7= Noise
Class 9 = Water
withheld
2008
withheld
Terrapoint USA
LiDAR Manager
mailing and physical address
251216 Grogan's Park Drive
The Woodlands
Texas
77380
USA
1-877-999-7687
1-281-296-0869
peggy.cobb@terrapoint.com
Monday to Friday, 8 - 5, CST
Dewberry used GeoCue software to develop LiDAR stereo models. The raster resolution was 1ft.
withheld
2008
withheld
Dewberry - Geospatial Services Group
mailing and physical address
8401 Arlington Boulevard
Fairfax
VA
22031
USA
703.849.0100
LiDAR intensity stereopairs were viewed in 3-D stereo using Socet Set softcopy photogrammetric software, the breaklines were stereo-compiled in accordance with the Data Dictionary. The LiDARgrammetry was performed under the direct supervision of an ASPRS Certified Photogrammetrist. The breaklines conform with data format requirements outlined by the FDEM Baseline Specifications.
withheld
2008
withheld
Dewberry - Geospatial Services Group
mailing and physical address
8401 Arlington Boulevard
Fairfax
VA
22031
USA
703.849.0100
Using proprietary procedures developed by Dewberry, a hydroenforced bare earth TIN was created using ArcGIS. The nodes were contour model key points from the ground masspoints derived from the Lidar dataset, the 3D breaklines were included in this TIN.
withheld
withheld
2008
withheld
Dewberry - Geospatial Services Group
mailing and physical address
8401 Arlington Boulevard
Fairfax
VA
22031
USA
703.849.0100
1ft contours were modeled from a hydroenforced bare earth TIN and then smoothed and simplified using proprietary procedures developed by Dewberry in ArGIS software.
withheld
2008
withheld
Dewberry - Geospatial Services Group
mailing and physical address
8401 Arlington Boulevard
Fairfax
VA
22031
USA
703.849.0100
Metadata imported.
withheld
20100401
10231500
Vector
Simple
FALSE
1028643
FALSE
FALSE
coordinate pair
0.001500
0.001500
survey feet
D_North_American_1983_HARN
Geodetic Reference System 80
6378137.000000
298.257222
GCS_North_American_1983_HARN
NAD_1983_HARN_StatePlane_Florida_East_FIPS_0901_Feet
North American Vertical Datum of 1988
0.000500
feet
Explicit elevation coordinate included with horizontal coordinates
OneFootContour
1ft Contours
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
Feature Class
1028643
OBJECTID
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
OBJECTID
OID
4
10
0
DATESTAMP_DT
The date the feature was added to the geodatabase.
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
Date
DATESTAMP_DT
Date
8
0
0
SHAPE
Feature geometry.
ESRI
Coordinates defining the features.
Shape
Geometry
4
0
0
CONTOUR_TYPE_DESC
Type of contour
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
1
Intermediate
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
2
Supplementary
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
3
Depression
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
4
Index
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
5
Intermediate Low Confidence
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
6
Supplementary Low Confidence
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
7
Depression Low Confidence
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
8
Index Low Confidence
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
CONTOUR_TYPE_DESC
String
50
0
0
CONTOUR_ELEVATION_MS
Elevation value
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
Elevation
CONTOUR_ELEVATION_MS
Double
8
38
8
Shape.STLength()
Shape.STLength()
Double
0
0
0
Florida Division of Emergency Management
mailing and physical address
2555 Shumard Oak Blvd
Tallahassee
FL
32399
USA
850-413-9907
850-488-1016
EOC-GIS@em.myflorida.com
Downloadable Data
The data represent the results of data collection and processing for a specific Florida Division of Emergency Management activity and indicates the general existing conditions at the time of the data collection. As such, it is only valid for its intended use, content, time, and accuracy specifications. The user is responsible for the results of any application of the data for other than its intended purpose.
20100401
Richard Butgereit
Florida DEM
GIS Administrator
mailing and physical address
2555 Shumard Oak Boulevard
Tallahassee
FL
32399-2100
USA
850-413-9907
850-488-1016
richard.butgereit@em.myflorida.com
REQUIRED: The person responsible for the metadata information.
REQUIRED: The organization responsible for the metadata information.
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile
en
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20100401
10231500
FALSE
20210421
14013000
20210421
14013000
OneFootContour
002
319999.993024
522736.476986
2160000.000565
2364999.999357
1
Projected
GCS_North_American_1983
Linear Unit: Foot_US (0.304801)
NAD_1983_StatePlane_Florida_East_FIPS_0901_Feet
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OneFootContour
319999.993
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2364999.9995
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1
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-81.422698
30.838123
30.270836
1
1
-82.071058
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30.838123
30.270836
ISO 19115 Geographic Information - Metadata
DIS_ESRI1.0
dataset
002
withheld
Local Area Network
File Geodatabase Feature Class
Feature Class
NAD_1983_HARN_StatePlane_Florida_East_FIPS_0901_Feet
EPSG
5.3(9.0.0)
1028643
20210421