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High Accuracy Elevation Data - Lake Okeechobee Littoral Zone

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Greg Desmond
Publication_Date: 2007
Title: High Accuracy Elevation Data - Lake Okeechobee Littoral Zone
Geospatial_Data_Presentation_Form: text files, shapefile
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Online_Linkage: <https://sofia.usgs.gov/exchange/desmond/desmondelev.html>
Description:
Abstract:
The U.S. Geological Survey (USGS) coordinated the acquisition of high accuracy elevation data (meters) for the Lake Okeechobee Littoral Zone collected on a 400 meter topographic grid with a vertical accuracy of +/- 15 centimeters. The elevations are referenced to the horizontal North American Datum of 1983 (NAD83) and vertical North American Vertical Datum of 1988 (NAVD88). The topographic surveys were performed using differential GPS technology and a USGS developed helicopter-based instrument known as the Airborne Height Finder (AHF).

The data are available for the areas shown on the USGS High Accuracy Elevation Data graphic at <https://sofia.usgs.gov/exchange/desmond/desmondelev.html>.

Purpose:
This project performed regional topographic surveys to collect and provide elevation data to parameterize hydrologic and ecological numerical simulation models that are being developed for ecosystem restoration activities.

Modeling of sheet flow and water surface levels in the wetlands of South Florida is very sensitive to changes in elevation due to the expansive and extremely low relief terrain. Hydrologists have determined minimum vertical accuracy requirements for the elevation data for use as input to hydrologic models. As a result, elevation data with a vertical accuracy specification of +/-15 centimeters (cm) relative to the North American Vertical Datum of 1988 (NAVD88) are being collected in critical areas using state-of-the-art differential global positioning system (GPS) technology and data processing techniques.

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20060724
Ending_Date: 20061012
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -81.25
East_Bounding_Coordinate: -80.625
North_Bounding_Coordinate: 27.25
South_Bounding_Coordinate: 26.625
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: High accuracy elevation data
Theme_Keyword: mapping
Theme_Keyword: digital elevation data
Theme_Keyword: DEM
Theme_Keyword: elevation
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: elevation
Theme_Keyword: 006
Place:
Place_Keyword_Thesaurus:
Department of Commerce, 1995, Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions, Federal Information Processing Standard (FIPS) 10-4, Washington, DC, National Institute of Standards and Technology
Place_Keyword: United States
Place_Keyword: US
Place:
Place_Keyword_Thesaurus:
U.S. Department of Commerce, 1987, Codes for the identification of the States, the District of Columbia and the outlying areas of the United States, and associated areas (Federal Information Processing Standard 5-2): Washington, DC, NIST
Place_Keyword: Florida
Place_Keyword: FL
Place:
Place_Keyword_Thesaurus:
Department of Commerce, 1990, Counties and Equivalent Entities of the United States, Its Possessions, and Associated Areas, FIPS 6-3, Washington, DC, National Institute of Standards and Technology
Place_Keyword: Okeechobee County
Place_Keyword: Palm Beach County
Place_Keyword: Hendry County
Place_Keyword: Glades County
Place:
Place_Keyword_Thesaurus: USGS Geographic Names Information System
Place_Keyword: Belle Glade
Place_Keyword: Cochrans Pass
Place_Keyword: Fisheating Bay
Place_Keyword: Lakeport
Place_Keyword: Lake Harbor
Place_Keyword: Moore Haven
Place_Keyword: Okeechobee
Place_Keyword: Pahokee
Place_Keyword: Lake Okeechobee
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Lake Okeechobee Littoral Zone
Place_Keyword: Greater Lake Okeechobee
Place_Keyword: Brighton SE
Place_Keyword: Clewiston North
Place_Keyword: Clewiston South
Place_Keyword: Loxahatchee NW
Place_Keyword: Loxahatchee SE
Place_Keyword: Loxahatchee SW
Access_Constraints: none
Use_Constraints:
None. Acknowledgement of the U.S. Geological Survey would be appreciated for products derived from these data.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Bob Glover
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: 521 National Center
City: Reston
State_or_Province: VA
Postal_Code: 20192
Country: USA
Contact_Voice_Telephone: 703 648-5056
Contact_Electronic_Mail_Address: rglover@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name: <https://sofia.usgs.gov/exchange/desmond/atlas/>
Browse_Graphic_File_Description:
map of USGS topographic quads containing elevation data around Lake Okeechobee
Browse_Graphic_File_Type: GIF
Browse_Graphic:
Browse_Graphic_File_Name: <https://sofia.usgs.gov/exchange/desmond/desmondelev.html>
Browse_Graphic_File_Description:
map showing the location of high accuracy elevation data around Lake Okeechobee
Browse_Graphic_File_Type: GIF
Data_Set_Credit:
GPS data converted to ESRI shapefile by Susan D. Price. Data collection done by Charles Henkle and Ed Cyran as USGS contractors.
Native_Data_Set_Environment: comma-separated values file and ESRI shapefile

Data_Quality_Information:
Logical_Consistency_Report: not available
Completeness_Report:
All verified and accepted data points are included in the files for each area
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Horizontal positions are established by GPS observations and are referenced to the North American Datum of 1983 (NAD83). The desired horizontal accuracy is +/- 15 centimeters. This level of accuracy is consistent with GPS differential techniques which use two stations - a high-quality dual-frequency GPS receiver base station and a roving GPS station. The density and accuracy of a given GPS data observation varies from a few meters to a few centimeters according to the Position Dilution of Precision (PDOP) in the study area. Generally if the PDOP is observed to be excessive, data collection is discontinued or the data are discarded. The PDOP is an indicator of the positional accuracy of the GPS that be can derived from the current GPS satellite geometry, which varies continuously. Generally the smaller the PDOP number, the higher the data quality. The PDOP is a permanent part of the recorded data and is also included in the post processing procedures during reduction of the GPS observations to NAD 83. Where possible, the GPS base station has an ellipsoid height to an accuracy of two centimeters relative to the Continuously Operating Reference Stations (CORS) or the High Accuracy Reference Network (HARN), both operated by the National Geodetic Survey (NGS).
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
For all elevation data the vertical accuracy specification is +/- 15 centimeters and is referenced to NAVD 1988.

This elevation data is intended primarily for use in hydrological modeling. It is collected as high accuracy, "bare earth" ground elevation. That is, the data are restricted to ground elevations only. "Bare earth" in the Everglades swamp environment is generally considered to be the layer of "muck" which will support a one pound weight on a bearing surface of approximately 5.3 square inches (2.6 inch circle). In non-swamp areas it is actual bare ground.

Lineage:
Process_Step:
Process_Description:
The process consists of the following steps:

1.Collection of GPS XYZ points and vegetation classification in the Lake Okeechobee Littoral Zone using the helicopter-based Airborne Height Finder (AHF) developed by the USGS.

2. The GPS data were processed into an ASCII list of NAD83 geographic XY coordinates, NAVD88 elevation Z value and descriptor attribute data. This file was transformed using Corpscon, version 5.11.08 from the U.S. Army Corps of Engineers to NAD83 UTM XY and NAVD88 Z coordinates. The file was output as an ASCII text file and processed at USGS in Reston, VA.

3. The x,y, and z values of the ASCII text file were reformatted to the decimal value of 100th of meter (centimeter) to represent the accuracy of the data and then imported into ArcGIS 9.1 to create an ESRI shapefile.

4. The ESRI shapefile was compressed into a .zip file using WinZip. The associated .dbf files were opened in MS Excel and saved as the comma separated value file which also is available for download.

Process_Date: 200708
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Susan D. Price
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: 521 National Center
City: Reston
State_or_Province: VA
Postal_Code: 20192
Country: USA
Contact_Voice_Telephone: 703 648 6692
Contact_Electronic_Mail_Address: sprice@usgs.gov

Spatial_Data_Organization_Information:
Indirect_Spatial_Reference: South Florida - Lake Okeechobee Littoral Zone
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Entity point
Point_and_Vector_Object_Count: 2865

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 17
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -81
Latitude_of_Projection_Origin: 0
False_Easting: 500000
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: Coordinate Pair
Coordinate_Representation:
Abscissa_Resolution: 400
Ordinate_Resolution: 400
Planar_Distance_Units: meters
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: .01
Altitude_Distance_Units: meters
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: ELEV_M
Entity_Type_Definition: ground surface elevation in meters
Entity_Type_Definition_Source: USGS
Detailed_Description:
Entity_Type:
Entity_Type_Label: X_UTM
Entity_Type_Definition: UTM X coordinate in meters for the data collection point
Entity_Type_Definition_Source: USGS
Detailed_Description:
Entity_Type:
Entity_Type_Label: Y_UTM
Entity_Type_Definition: UTM Y coordinate in meters for the data collection point
Entity_Type_Definition_Source: USGS
Detailed_Description:
Entity_Type:
Entity_Type_Label: QUAD_NAME
Entity_Type_Definition:
The name of the USGS 1:24,000-scale topographic quadrangle in which the point falls
Entity_Type_Definition_Source: USGS
Detailed_Description:
Entity_Type:
Entity_Type_Label: VEG_FS
Entity_Type_Definition:
The vegetation observed by the surveyor at the data collection point. Vegetation types include Alligator Hole, Broadleaf Emergent, Cattail, Cypress, Floating Emergent, Hardwood, Lygodium, Melaleuca, Open Water, Palmetto, Pine, Sawgrass, Shrub, Slough, Tree Island, Wet Prairie, Wet Prairie/Slough, and Willow Shrub
Entity_Type_Definition_Source: USGS
Detailed_Description:
Entity_Type:
Entity_Type_Label: SUR_METHOD
Entity_Type_Definition:
type of surveying method - all data for the Lake Littoral zone were collected using the helicopter based Airborne Height Finder (AHF)
Entity_Type_Definition_Source: USGS
Detailed_Description:
Entity_Type:
Entity_Type_Label: SUR_INFO
Entity_Type_Definition:
Characters 1-5 are the file name used by the surveyor during data collection. Characters 6-8 are the Julian date of the data collection. Characters 9-10 are the year the data were collected. Character 11 is a blank space. Characters 12-19 represent the date the data were released for publication and archive after the data have been collected, processed, edited, quality controlled, and approved for release. Character 20 is "Y" which means the data can be released. This is not the date the data were collected.

If new data were added to the quadrangle, the revision date was modified for ALL points in the quadrangle to reflect the latest revision date. At the completion of data collection, the individual quad-based files were aggregated to create the larger files now available for download.

Entity_Type_Definition_Source: USGS
Detailed_Description:
Entity_Type:
Entity_Type_Label: SUR_FILE
Entity_Type_Definition:
file name used by the surveyor for internal data management purposes
Entity_Type_Definition_Source: USGS

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Heather S.Henkel
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: 600 Fourth St. South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727 803-8747 ext 3028
Contact_Facsimile_Telephone: 727 803-2030
Contact_Electronic_Mail_Address: hhenkel@usgs.gov
Resource_Description: Helicopter - Airborne Height Finder
Distribution_Liability: No warrantees are implied or explicit for the data
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ASCII
Format_Version_Date: 1985
Format_Specification: .csv
Format_Information_Content:
comma separated values file of Global Positioning System (GPS) points
Transfer_Size: 0.261
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <https://sofia.usgs.gov/exchange/desmond/desmondelev.html>
Access_Instructions: File may be downloaded from the SOFIA website
Digital_Form:
Digital_Transfer_Information:
Format_Name: zip
Format_Version_Number: unknown
Format_Specification: shp.zip
Format_Information_Content: ArcGIS shapefile and associated files
File_Decompression_Technique: the file must be unzipped before use
Transfer_Size: 0.109
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <https://sofia.usgs.gov/exchange/desmond/desmondelev.html>
Access_Instructions: File may be downloaded from the SOFIA website
Fees: none

Metadata_Reference_Information:
Metadata_Date: 20071024
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Heather Henkel
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing and physical address
Address: 600 Fourth Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727 803-8747 ext 3028
Contact_Facsimile_Telephone: 727 803-2030
Contact_Electronic_Mail_Address: sofia-metadata@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

This page is <https://sofia.usgs.gov/metadata/sflwww/HAED_okee.html>

U.S. Department of the Interior, U.S. Geological Survey
Comments and suggestions? Contact: Heather Henkel - Webmaster
Generated by mp version 2.8.18 on Wed Oct 24 14:49:41 2007