2007 Florida Division of Emergency Management (FDEM) Lidar Project: Nassau County

Metadata also available as

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator:
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC)
Originator: Florida Division of Emergency Management
Publication_Date: 20120418
Title:
2007 Florida Division of Emergency Management (FDEM) Lidar Project: Nassau County
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: Charleston, SC
Publisher: NOAA's Ocean Service, Coastal Services Center (CSC)
Other_Citation_Details:
This data set has been extracted from one much larger. See the URL for the location of this larger data set.
Online_Linkage:
<http://csc-s-maps-q.csc.noaa.gov/dataviewer/viewer.html?keyword=lidar>
Online_Linkage: <http://www.csc.noaa.gov/lidar>
Online_Linkage: <http://www.csc.noaa.gov>
Description:
Abstract:
This report pertains to a Specific Purpose LiDAR Survey of Nassau County, Florida. The LiDAR aerial acquisition was conducted by Terrapoint USA between August 18, 2007 and September 4, 2007, and the breaklines and contours were subsequently generated by Dewberry. The PDS team is under contract HS-34-14-00-22-469 with the Florida Division of Emergency Management (FDEM) and offered LiDAR and derived products as an add-on agreement with Nassau County at the same rates as negotiated for the FDEM contract and utilizing the same Baseline Specifications from FDEM.
The LiDAR dataset of Nassau County was acquired by Terrapoint USA and processed to a bare-earth digital terrain model (DTM) in accordance with FDEM Baseline Specifications. Detailed breaklines and contours were also produced by the PDS team. Each tile covers an area of 5000 ft by 5000 ft.
The FDEM Baseline Specifications require a maximum LiDAR post spacing of 4 feet, i.e., an average point density of less than 1 point per square meter. However, the PDS team required a much higher point density of its subcontractors in order to increase the probability of penetrating dense foliage; with nominal post spacing of 0.7 meters per flight line and 50% sidelap between flight lines, the average point density is 4 points per square meter with higher point density there is a greater probability of penetrating dense vegetation and minimizing areas defined as “low confidence areas.”
LiDAR was delivered as a point cloud in LAS 1.1 format.
This data set is a raster file of z values with 3593 columns and 3593 rows. The data set was extracted from a larger classified data set and only includes points classified as Ground within the requested geographic bounds.
Purpose:
These data support the Florida Division of Emergency Management's (FDEM) development and maintenance of Regional Evacuation Studies, which include vulnerability assessments and assist disaster response personnel in understanding threats to Florida's citizens and visitors.
Supplemental_Information:
The Lidar QA/QC Quantitative and Qualitative Assessment Report for this data set may be viewed at: <ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/fl/fdem/nassau/lidarqaqcreport_nassau_final.pdf>
A footprint of this data set may be viewed in Google Earth at: <ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/fl/fdem/nassau/2007_FDEM_Lidar_Nassau_County.kmz>
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20070818
Ending_Date: 20071004
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: 368820
East_Bounding_Coordinate: 386785
North_Bounding_Coordinate: 2237170
South_Bounding_Coordinate: 2219205
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: elevation
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Bathymetry/Topography
Theme_Keyword: DTM
Theme_Keyword: Elevation
Theme_Keyword: Lidar
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: US
Place_Keyword: Florida
Place_Keyword: Nassau County
Access_Constraints:
This data set was compiled dynamically, and will exist on ftp.csc.noaa.gov/pub/crs/beachmap/data until 10 days after 04/18/2012, as 001_001_fill.zip. After 10 days this file will be deleted from the system.
Use_Constraints:
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.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Florida DEM
Contact_Address:
Address_Type: mailing and physical address
Address: 2555 Shumard Oak Boulevard
City: Tallahassee
State_or_Province: FL
Postal_Code: 32399-2100
Country: USA
Contact_Voice_Telephone: 850-413-9907
Contact_Facsimile_Telephone: 850-488-1016
Contact_Electronic_Mail_Address: gis@dca.state.fl.us
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.3.1.1850
Data_Quality_Information:
Logical_Consistency_Report: Data covers the tile scheme provided for the county.
Completeness_Report:
A visual qualitative assessment was performed to ensure the data completness against the intensity images derived from Lidar points. No void or missing data.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: Lidar source compiled to meet 1m horizontal accuracy.
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: 1 meter
Horizontal_Positional_Accuracy_Explanation:
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.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The LiDAR is required to meet .60 feet Fundamental Vertical Accuracy (FVA) and 1.19 feet Consolidated Vertical Accuracy (CVA).
Quantitative_Vertical_Positional_Accuracy_Assessment:
Vertical_Positional_Accuracy_Value: 0.60 feet
Vertical_Positional_Accuracy_Explanation:
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.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Terrapoint USA
Publication_Date: 2007
Publication_Time: Unknown
Title: Lidar
Geospatial_Data_Presentation_Form: vector digital data
Other_Citation_Details:
LiDAR Survey of Nassau County, Florida, conducted in 2007 in support of the Florida Division of Emergency Management (FDEM).
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20070818
Ending_Date: 20071015
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: Lidar data
Source_Contribution:
LiDAR dataset was used to create intensity stereopairs for 3D breakline compilation and for contour generation.
Process_Step:
Process_Description:
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.
Source_Used_Citation_Abbreviation: Lidar data
Process_Date: 2008
Source_Produced_Citation_Abbreviation: LiDAR Point Cloud LAS 1.1 format
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Terrapoint USA
Contact_Position: LiDAR Manager
Contact_Address:
Address_Type: mailing and physical address
Address: 251216 Grogan's Park Drive
City: The Woodlands
State_or_Province: Texas
Postal_Code: 77380
Country: USA
Contact_Voice_Telephone: 1-877-999-7687
Contact_Facsimile_Telephone: 1-281-296-0869
Contact_Electronic_Mail_Address: peggy.cobb@terrapoint.com
Hours_of_Service: Monday to Friday, 8 - 5, CST
Process_Step:
Process_Description:
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
Source_Used_Citation_Abbreviation: LiDAR Point Cloud LAS 1.1 format
Process_Date: 2008
Source_Produced_Citation_Abbreviation: Classified LiDAR datasets
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Terrapoint USA
Contact_Position: LiDAR Manager
Contact_Address:
Address_Type: mailing and physical address
Address: 251216 Grogan's Park Drive
City: The Woodlands
State_or_Province: Texas
Postal_Code: 77380
Country: USA
Contact_Voice_Telephone: 1-877-999-7687
Contact_Facsimile_Telephone: 1-281-296-0869
Contact_Electronic_Mail_Address: peggy.cobb@terrapoint.com
Hours_of_Service: Monday to Friday, 8 - 5, CST
Process_Step:
Process_Description:
The NOAA Coastal Services Center (CSC) received the files in las format. The files contained Lidar elevation and intensity measurements. The data were in projected in Florida State Plane Coordinates (East Zone, NAD83/HARN), and referenced to the orthometric datum of NAVD88 utilizing Geoid 03. CSC performed the following processing to the data to make it available within the Digital Coast: 1. The data were converted from State Plane Coordinates (NAD83/HARN) coordinates to geographic coordinates (NAD83). 2. The data were converted from NAVD88 (orthometric) heights to GRS80 (ellipsoid) heights using Geoid 03. 3. The LAS data were sorted by latitude and the headers were updated.
Process_Date: 20101020
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NOAA Coastal Services Center
Contact_Position: Clearinghouse Manager
Contact_Address:
Address_Type: mailing and physical
Address: 2234 South Hobson Ave.
City: Charleston
State_or_Province: SC
Postal_Code: 29405-2413
Contact_Voice_Telephone: 843-740-1210
Contact_Electronic_Mail_Address: clearinghouse@noaa.gov
Process_Step:
Process_Description:
The vertical values in this data set have been converted to reference NAVD88, using the GEOID09 grids provided by the National Geodetic Survey. For Puerto Rico and the Virgin Islands, the GEOID03 grids have been used.
Process_Date: 20120418
Process_Step:
Process_Description:
The data values in this data set have been rasterized to a binary raster file format. The binary raster file format, as described in the ArcView Spatial Analyst Help, is a simple format that can be used to transfer raster data between various applications. It consists of two files, the IEEE floating-point file (.flt) and a supporting ASCII header file (.hdr). The header file must have the same name as the data file. The header data includes the following keywords and values: 1)ncols - number of columns in the data set. 2)nrows - number of rows in the data set. 3)xllcorner - x-coordinate of the lower-left corner of the lower-left cell. 4)yllcorner - y-coordinate of the lower-left corner of the lower-left cell. 5)cellsize - cell size for the data set. 6)nodata_value - value in the file assigned to cells whose value is unknown (set to -999999). 6)byteorder - the byte order of the binary cell values.
Process_Date: 20120418
Process_Step:
Process_Description:
The data values in this data set have been projected. This projection is noted in another section of this metadata record. The projection library used was derived from the General Cartographic Transform Program developed by the United States Geological Survey, National Mapping Division.
Process_Date: 20120418
Process_Step:
Process_Description:
The cell values in this data set represent the average elevation measurement found within each cell, or if there were no values in the cell, a value may have been interpolated from surrounding cells with data values. The perimeter cells of a 3x3 box surrounding the empty cell is queried for known values - if less than three values are found, then the perimeter cells of a 5x5 box is searched for known values. This process is repeated for a 7x7 box if less than 3 values are found. If less than three accumulated known values were found, then the cell is assigned a no data value (usually -999999). If at least 3 values were found in that search, the value in the empty cell is interpolated from the known values using an Inverse Distance Weighting (IDW) method.
Process_Date: 20120418
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC)
Contact_Position: Coastal Elevation Mapping (CEM) Project Scientist
Contact_Address:
Address_Type: mailing and physical
Address: 2234 South Hobson Avenue
City: Charleston
State_or_Province: South Carolina
Postal_Code: 29405
Country: United States
Contact_Voice_Telephone: (843) 740-1200
Contact_Electronic_Mail_Address: tcm@csc.noaa.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid cell
Row_Count: 3593
Column_Count: 3593
Vertical_Count: 1
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 5.0
Ordinate_Resolution: 5.0
Planar_Distance_Units: survey feet
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: 0.0328
Altitude_Distance_Units: feet
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: LAS
Entity_Type_Definition: Lidar point cloud LAS 1.1 format
Entity_Type_Definition_Source:
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NOAA Coastal Services Center
Contact_Position: Clearinghouse Manager
Contact_Address:
Address_Type: mailing and physical
Address: 2234 South Hobson Ave.
City: Charleston
State_or_Province: SC
Postal_Code: 29405-2413
Contact_Voice_Telephone: 843-740-1210
Contact_Electronic_Mail_Address: clearinghouse@noaa.gov
Resource_Description: Downloadable Data
Distribution_Liability:
Any conclusions drawn from the analysis of this information are not the responsibility of the Coastal Services Center or its partners.
Custom_Order_Process:
This data can be obtained on-line at the following URL: <http://www.csc.noaa.gov/lidar> The data set is dynamically generated based on user-specified parameters.
Metadata_Reference_Information:
Metadata_Date: 20101031
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NOAA Coastal Services Center
Contact_Position: Clearinghouse Manager
Contact_Address:
Address_Type: mailing and physical
Address: 2234 South Hobson Ave.
City: Charleston
State_or_Province: SC
Postal_Code: 29405-2413
Contact_Voice_Telephone: 843-740-1210
Contact_Electronic_Mail_Address: clearinghouse@noaa.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Generated by mp version 2.9.6 on Fri Aug 31 12:59:52 2012