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High Accuracy Elevation Data - Water Conservation Areas and Greater Everglades Region

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Greg Desmond
Publication_Date: 200710
Title:
High Accuracy Elevation Data - Water Conservation Areas and Greater Everglades Region
Geospatial_Data_Presentation_Form: text files, shapefiles
Online_Linkage: <https://sofia.usgs.gov/exchange/desmond/desmondelev.html>
Description:
Abstract:
The High Accuracy Elevation Data Project collected elevation data (meters) on a 400 meter topographic grid with a vertical accuracy of +/- 15 centimeters to define the topography in South Florida. The data are referenced to the horizontal datum North American Datum 1983 (NAD 83) and the vertical datum North American Vertical Datum 1988 (NAVD 88). In some areas, the surveying was accomplished using airboats. Because access was a logistical problem with airboats, the USGS developed a helicopter-based instrument known as the Airborne Height Finder (AHF). All subsequent data collection used the AHF. Data were collected from the Loxahatchee National Wildlife Refuge, south through the Water Conservation Areas (1A, 2A, 2B, 3A, and 3B), Big Cypress National Park, the Everglades National Park, to the Florida Bay. 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>. The work was performed for Everglades ecosystem restoration purposes.
Purpose:
The data are from 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. Surveying services were also rendered to provide vertical reference points for numerous water level gauges.

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 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) were 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: 1995
Ending_Date: 2007
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -81.5
East_Bounding_Coordinate: -80.125
North_Bounding_Coordinate: 26.75
South_Bounding_Coordinate: 25.125
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: High accuracy elevation data
Theme_Keyword: mapping
Theme_Keyword: digital elevation data
Theme_Keyword: DEM
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: Broward County
Place_Keyword: Collier County
Place_Keyword: Miami-Dade County
Place_Keyword: Monroe County
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: South East Coast
Place_Keyword: SW Big Cypress
Place_Keyword: Cooper City SW
Place_Keyword: Coral Springs NE
Place_Keyword: East of Deem City
Place_Keyword: East of Lone Palm Head
Place_Keyword: Hialeah SW
Place_Keyword: Lake Ingraham East
Place_Keyword: Lake Ingraham West
Place_Keyword: Loxahatchee NW
Place_Keyword: Loxahatchee SE
Place_Keyword: Loxahatchee SW
Place_Keyword: North of Fortymile Bend
Place_Keyword: Royal Palm Ranger Station SE
Place_Keyword: South of Coopertown
Place_Keyword: South of Deem City
Place_Keyword: West of Big Lake
Place_Keyword: West of Deem City
Place_Keyword: West of Pennsuco
Place_Keyword: Whitewater Bay East
Place_Keyword: Whitewater Bay West
Place_Keyword: Cooper City NE
Place_Keyword: Monroe Station NE
Place_Keyword: North of Deem City
Place_Keyword: North of Fiftymile Bend
Place_Keyword: North of Lone Palm Head
Place_Keyword: South Miami NW
Place_Keyword: West of Horseshoe Head
Place_Keyword: Central Everglades
Place:
Place_Keyword_Thesaurus: USGS Geographic Names Information System
Place_Keyword: Andytown
Place_Keyword: Big Boy Lake
Place_Keyword: Big Lostmans Bay
Place_Keyword: Black Hammock
Place_Keyword: Blackwater Sound
Place_Keyword: Chekika Island
Place_Keyword: Chokoloskee
Place_Keyword: Coopertown
Place_Keyword: Custard Apple Hammock
Place_Keyword: Fiftymile Bend
Place_Keyword: Flamingo
Place_Keyword: Fortymile Bend
Place_Keyword: Gator Hook Swamp
Place_Keyword: Glades
Place_Keyword: Grossman Hammock
Place_Keyword: Harney River
Place_Keyword: Homestead
Place_Keyword: Horseshoe Head
Place_Keyword: Indian Camp Creek
Place_Keyword: Joe Bay
Place_Keyword: Long Island
Place_Keyword: Long Pine Key
Place_Keyword: Lostmans River Ranger Station
Place_Keyword: Lostmans Trail
Place_Keyword: Madeira Bay
Place_Keyword: Mahogany Hammock
Place_Keyword: Melaleuka Head
Place_Keyword: Monroe Station
Place_Keyword: Ochopee
Place_Keyword: Pa-Hay-Okee Lookout Tower
Place_Keyword: Panther Mound
Place_Keyword: Pavillion Key
Place_Keyword: Pennsuco
Place_Keyword: Royal Palm Ranger Station
Place_Keyword: Shark Point
Place_Keyword: Tarpon Bay
Place_Keyword: Taylor Slough
Place_Keyword: West Lake
Place_Keyword: Shark River Island
Place_Keyword: Shark Valley Lookout Tower
Place_Keyword: Big Lake
Place_Keyword: Gator Lake
Place_Keyword: Greenacres City
Place_Keyword: Lone Palm Head
Place_Keyword: Loxahatchee
Place_Keyword: University Park
Place_Keyword: California Slough
Place_Keyword: Deem City
Place_Keyword: Everglades City
Place_Keyword: Plover Key
Place_Keyword: Sandy Key
Place_Keyword: Weavers Station
Place_Keyword: West Dixie Bend
Place_Keyword: Alligator Bay
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/desmondelev.html>
Browse_Graphic_File_Description:
map showing water conservation areas and greater Everglades region
Browse_Graphic_File_Type: GIF
Browse_Graphic:
Browse_Graphic_File_Name: <https://sofia.usgs.gov/exchange/desmond/atlas/>
Browse_Graphic_File_Description:
map showing topographic quadrangles in the water conservation areas and greater Everglades region
Browse_Graphic_File_Type: GIF
Data_Set_Credit:
Data collection done by Charles Henkle, Gordon Shupe, Bob Glover, Ed Cyran, and Greg Desmond of the USGS and contractors. Other project personnel include Vince Caruso, Gary Freeman, and Susan Price.
Native_Data_Set_Environment:
compressed ArcGIS shapefile (.zip), comma-separated value file (.csv), and compressed .csv (.zip)

Data_Quality_Information:
Logical_Consistency_Report:
The Grossman Hammock and Perrine quadrangles have helicopter AHF & airboat and truck data
Completeness_Report:
All verified and accepted data points are included in the files for the 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 for creating digital elevation files consisted of the following steps:

1. Collection of GPS XYZ points in and around the Greater Everglades Region from the Water Conservation Areas (1A, 2A, 2B, 3A, and 3B), Big Cypress National Preserve, the Everglades National Park, to the Florida Bay, and environs using the following collection platforms: airboat and helicopter-based Airborne Height Finder (AHF) developed by the USGS.

2. The GPS data were transformed from NAD83 geographic X, Y coordinates and NAVD88 elevation Z valuse to NAD83 UTM X, Y and NAVD88 Z coordinates via "Corpscon for Windows" from the U.S. Army Corps of Engineers. <http://crunch.tec.army.mil/software/corpscon/corpscon.html>

3. The coordinate data were imported into a geographic information system to create multiple geospatial data formats.

4. Multiple formats of the data were posted to the SOFIA website.

5. This process was repeated for each quad-based file of data collected by the surveyors during the 12 year life of the project.

6. The ASCII text files containing more than 50,000 data records were aggregated and reformatted using custom shell scripts. These data were imported into ArcGIS (version 9.1) to create the the shapefile HAED_v01.shp available for download.

7. The associated .dbf files were opened in MS Excel and saved as the comma-separated values files which also are 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: Water Conservation areas and greater Everglades region
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: 57395

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: X UTM 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: Y UTM 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 1:20,000-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
Entity_Type_Definition_Source: USGS
Attribute:
Attribute_Label: AHF
Attribute_Definition:
Airborne Height Finder - a helicopter-based instrument used to access data points
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Unrepresentable_Domain: AHF
Attribute:
Attribute_Label: airboat
Attribute_Definition: data collected using an airboat to access data points
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Unrepresentable_Domain: airboat
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.

During the 12 year lifetime of the project, data points were released as individual files (see SUR_FILE attribute) to match the published USGS 7.5-minute topographic quadrangle footprint. 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 & airboat
Distribution_Liability: No warrantees are implied or explicit for the data
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ASCII
Format_Version_Number: 1985
Format_Specification: csv
Format_Information_Content: comma-separated values for the elevations in map area 2
Transfer_Size: 4.5
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <https://sofia.usgs.gov/exchange/desmond/desmondelev.html>
Access_Instructions: File amy be downloaded form the SOFIA website
Digital_Form:
Digital_Transfer_Information:
Format_Name: zip
Format_Version_Number: unknown
Format_Specification: csv.zip
Format_Information_Content: comma-separated values for elevations in map area 2
File_Decompression_Technique: file must be unzipped before use
Transfer_Size: 0.7
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 shapefiles and associated files for map area 2
File_Decompression_Technique: file must be unzipped before use
Transfer_Size: 1.7
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_WCA_Everglades.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 15:00:34 2007