Everglades Depth Estimation Network (EDEN) October 2011 Digital Elevation Model (DEM)

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: U.S. Geological Survey

Publication_Date: 201110

Title:

Everglades Depth Estimation Network (EDEN) October 2011 Digital Elevation Model (DEM)

Geospatial_Data_Presentation_Form: raster digital data

Online_Linkage: <https://sofia.usgs.gov/eden/models/groundelevmod.php>

Description:

Abstract:

This is the 2nd release of the fourth version of an Everglades Depth Estimation Network (EDEN) digital elevation model (DEM) generated from certified airborne height finder (AHF) and airboat collected ground surface elevations for the Greater Everglades Region. Collectively, these data are referred to as "High Accuracy Elevation Data" (HAED). Inconsistencies in available greater Everglades boundary files resulted in a missing elevation value for 1 cell along the western boundary of WCA3s. In this release, that single cell was "filled" with a value of 2.19682 meters as determined through the kriging process summarized below. As was the case with the 1st release (EDEN_em_JA10), this version differs from the previous elevation model (EDEN_EM_OCT07) in several ways. First, the kriging algorithm applied to newly modeled subareas was changed from ordinary to universal kriging - resulting in slightly lower errors during cross-validation and accuracy assessment. Second, a previously omitted area in the northwestern corner of the Everglades National Park (ENP) and southern portion of Big Cypress National Preserve has been filled. Third, to increase accuracy in WCA1, the most challenging EDEN subarea from an elevation modeling standpoint, the Conservation area is subdivided into 4 zones (Northern, Central, Southwest and Southeast). Boundaries between the North, Central and two Southern zones is based upon landscape units defined through the CERP. The landscape unit representing approximately the southern third of WCA1 was further divided into two zones (east and west) based on marked changes in slope and aspect data generated from a DEM of the southern landscape unit as a whole. Division of WCA1 into 5 zones reduces errors estimated by comparing DEM modeled water depths with those measured by EDEN Principal Investigators in the field. Subdivision of the south landscape unit into east and west zones resulted in lower error estimates for the eastern subzone (i.e., southeast) without significantly affecting (i.e., improving or degrading) the quality of the western subzone - an area where DEM modeling is most challenging. Finally, to reduce artificial breaks in elevation along WCA1 subarea boundaries, models were overlapped by 1 cell at these boundaries and, for the North, Central and South zone boundaries, overlapping model values were averaged. For the boundaries between the Southwest and Southeast zones, cell values were "blended" based on weighted distance from the boundary edge. Finally, points along the North / Central and Central / South zone edges were subjectively selected and changed by adding or subtracting 0.03 meters (3 cm) to particular cells. This slightly reduces apparent artifacts without drastically affecting the integrity of the model. The EDEN offers a consistent and documented dataset that can be used to guide large-scale field operations, to integrate hydrologic and ecological responses, and to support biological and ecological assessments that measure ecosystem responses to Comprehensive Everglades Restoration Plan. To produce historic and near-real time maps of water depths, the EDEN requires a system-wide DEM of the ground surface.

Purpose:

These data were specifically created for the development of water depth information using interpolated water surfaces from the EDEN stage data network.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1995

Ending_Date: 201110

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -81.37

East_Bounding_Coordinate: -80.22

North_Bounding_Coordinate: 26.69

South_Bounding_Coordinate: 25.22

Keywords:

Theme:

Theme_Keyword_Thesaurus: none

Theme_Keyword: digital elevation model

Theme_Keyword: mapping

Theme_Keyword: DEM

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: elevation

Theme_Keyword: imageryBaseMapsEarthCover

Theme_Keyword: 006

Theme_Keyword: 010

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_Keyword: Palm Beach County

Place:

Place_Keyword_Thesaurus: USGS Geographic Names Information System

Place_Keyword: Everglades National Park

Place_Keyword: Big Cypress National Preserve

Place:

Place_Keyword_Thesaurus: none

Place_Keyword: Central Everglades

Place_Keyword: Greater Lake Okeechobee

Place_Keyword: SW Big Cypress

Place_Keyword: WCA1

Place_Keyword: Water Conservation Area 1

Place_Keyword: WCA2

Place_Keyword: Water Conservation Area 2

Place_Keyword: WCA3

Place_Keyword: Water Conservation Area 3

Place_Keyword: Greater Everglades region

Access_Constraints:

These data were produced for EDEN operational water depth estimation and applications.

Use_Constraints:

The user is cautioned that this elevation model was produced specifically for EDEN applications and is based on input data of approximately 400m sample spacing and +/- 15cm vertical accuracy. No statement of appropriateness for uses other than that intended are implied.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: John W. Jones

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: 703 648-5543

Contact_Facsimile_Telephone: 703 648-4165

Contact_Electronic_Mail_Address: jwjones@usgs.gov

Browse_Graphic:

Browse_Graphic_File_Name:

<https://sofia.usgs.gov/eden/images/maps/EDEN_oc11_release_graphic_lg.gif>

Browse_Graphic_File_Description: graphic showing the coverage of EDEN_EM_OC11

Browse_Graphic_File_Type: GIF

Browse_Graphic:

Browse_Graphic_File_Name:

<https://sofia.usgs.gov/publications/fs/2006-3087/images/figure2.jpg>

Browse_Graphic_File_Description:

location of Everglades Depth Estimation Network (EDEN) gaging stations

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name:

<http://www.evergladesplan.org/pm/recover/recover_docs/map/MAP_3.1_GE.pdf>

Browse_Graphic_File_Description:

p. 3-38 shows the a satellite image with the landscape units of Greater Everglades wetlands to be used for stratified random sampling design

Browse_Graphic_File_Type: pdf

Native_Data_Set_Environment: ESRI ArcGIS 9.1 ARCG .e00 grid interchange format and PDF

Cross_Reference:

Citation_Information:

Originator: Pamela Telis

Publication_Date: 2006

Title:

The Everglades Depth Estimation Network (EDEN) for support of ecological and biological assessments

Geospatial_Data_Presentation_Form: fact sheet

Series_Information:

Series_Name: USGS Fact Sheet

Issue_Identification: 2006-3087

Publication_Information:

Publication_Place: St. Petersburg, FL

Publisher: U.S. Geological Survey

Other_Citation_Details: accessed as of 12/29/2009

Online_Linkage: <https://sofia.usgs.gov/publications/fs/2006-3087/index.html>

Cross_Reference:

Citation_Information:

Originator: Jones, J. W.

Publication_Date: 2001

Title:

Image and in situ data integration to derive sawgrass density information for surface-flow modeling in the Everglades

Geospatial_Data_Presentation_Form: report

Publication_Information:

Publication_Place: Wallingford, Oxfordshire, UK

Publisher: International Association of Hydrological Sciences

Other_Citation_Details:

in Remote Sensing and Hydrology 2000, editors Manfred Owe, Kaye Brubaker, Jerry Ritchie, and Albert Rango, publication 267, ISBN 1-901502-46-5

Cross_Reference:

Citation_Information:

Originator: Desmond, G. B.

Publication_Date: 2003

Title:

Measuring and mapping the topography of the Florida Everglades for Ecosystem Restoration

Geospatial_Data_Presentation_Form: fact sheet

Series_Information:

Series_Name: USGS Fact Sheet

Issue_Identification: 021-03

Publication_Information:

Publication_Place: Reston, VA

Publisher: U.S. Geological Survey

Other_Citation_Details: accessed as of 1/11/2010

Online_Linkage: <https://sofia.usgs.gov/publications/fs/021-03/index.html>

Cross_Reference:

Citation_Information:

Originator: U.S> Army Corps of Engineers

Publication_Date: 2004

Title:

RECOVER: Monitoring and Assessment Plan (MAP) 2004 Greater Everglades Wetlands Module

Geospatial_Data_Presentation_Form: report

Publication_Information:

Publication_Place: Jacksonville, FL

Publisher: U.S. Army Corps of Engineers

Other_Citation_Details: accessed as of 2/3/2010

Online_Linkage:

<http://www.evergladesplan.org/pm/recover/recover_docs/map/MAP_3.1_GE.pdf>

Data_Quality_Information:

Logical_Consistency_Report:

The EDEN monitoring network includes ground-elevation measurements and continuous water-level data.

Completeness_Report:

Ground-surface elevation data were collected by the USGS at more than 50,000 points with an approximate spacing of 400 meters covering almost the entire Greater Everglades. The EDEN water-level network consists of hourly water-level data from 253 gaging stations (230 existing gaging stations and 23 new installations) and includes freshwater (nontidal) marsh gaging stations, boundary gages on canals, and coastal gaging stations operated by the Big Cypress National Preserve (BCNP), Everglades National Park (ENP), South Florida Water Management District (SFWMD), and USGS. The U.S. Army Corps of Engineers (USACE) and SFWMD recently documented or surveyed a majority of the hydrologic gages in the Greater Everglades to obtain correct values for converting water-level data from NGVD 29 to NAVD 88. The NAVD 88 datum is consistent in comparing water-level data across the Greater Everglades and computing accurate water depths.

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:

Source data (HAED) collected to better than +/- 15cm. Standard errors of cross-validation for the DEM range from ~7cm to ~21cm depending on the EDEN subarea.

Lineage:

Process_Step:

Process_Description:

The EDEN domain was broken into a large number of equal-sized rectangles (cells) that in total are referred to as the "grid". Characteristics of this grid, such as location of the centroid, the representative area of the Everglades, elevation, and percentage of vegetation type, define the grid spatial parameters. To match the Airborne Height Finder (AHF) data sampling spacing, the spatial resolution or the dimension (in ground distance) of each grid cell is 400 meters on each side. The ground surface DEM development process is iterative as additional high accuracy elevation data (HAED) are collected, water surfacing algorithms improve, and additional ground-based ancillary data become available. This version was produced by using all available AHF points posted to SOFIA as of August 2007.
To create a realistic region-wide elevation model for EDEN purposes, the elevation data were segregated by Water Conservation Areas and National Park boundaries so that local trends could be isolated, sub-region specific interpolation models could be developed, and realistic breaks in elevation along sub-region boundaries could be imbedded in a final, region-wide DEM.
For the previous release of the DEM, subarea DEMs were produced using the geostatistical approach called "anisotropic ordinary kriging". This version is composed of new models created for each new EDEN subarea in Water Conservation Area 1 (WCA1) and for the new coverage in the southern portion of BCNP and the northwest corner of the ENP. For the latest iteration of the EDEN DEM "anisotropic universal kriging" was employed.
As with the previously released DEM, WCA1 surfaces were produced by removing all "upland" AHF points. However, in this version WCA1 "upland" was defined through a reclassification of the South Florida Water Management Vegetation Map rather than the Florida GAP map.
As the most challenging area from an elevation modeling standpoint, for this revision WCA1 was further subdivided into a total of 4 zones. First, boundaries between the North, Central and two South zones are based upon landscape units defined through the CERP Monitoring and Assessment Plan, Part 1 (Figure 3-20). Then the South landscape unit (representing approximately the southern third of WCA1) was further divided into two zones (east and west, termed "Southeast" and"Southwest") based on marked changes in slope and aspect data that were generated from a DEM of the South landscape unit as a whole. Division of WCA1 into 4 zones reduces errors estimated by comparing DEM modeled water depths with those measured by EDEN Principal Investigators in the field. Subdivision of the south landscape unit into east and west zones resulted in lower error estimates for the Southeast zone without significantly affecting (i.e., improving or degrading) the quality of the Southwest zone - an area where DEM modeling is most challenging.
A previously omitted area in the southern portion of the Big Cypress National Preserve (BCNP) and the northwestern corner of the Everglades National Park (ENP) has been filled.

Process_Date: 2009

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: John Jones

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: 703 648-5543

Contact_Facsimile_Telephone: 703 648-4165

Contact_Electronic_Mail_Address: jwjones@usgs.gov

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference: Greater Everglades region

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Grid Cell

Row_Count: 405

Column_Count: 287

Vertical_Count: 1

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: Row and Column

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: .15

Altitude_Distance_Units: meters

Altitude_Encoding_Method:

Explicit elevation coordinate included with horizontal coordinates

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: EDEN_EM_ OC11

Distribution_Liability: No warrantees are implied or explicit for the data

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ARCG

Format_Version_Number: ArcGIS 9.1

Format_Specification: .zip

Format_Information_Content: zipped file of ArcINFO .e00 grid interchange format

File_Decompression_Technique: Win Zip 9.0 - SR1

Transfer_Size: 0.5

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <https://sofia.usgs.gov/eden/models/groundelevmod.php>

Access_Instructions: The data may be downloaded from the SOFIA website.

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <https://sofia.usgs.gov/eden/models/groundelevmod.php>

Access_Instructions: The file may be downloaded from the SOFIA website

Fees: none

Metadata_Reference_Information:

Metadata_Date: 20111027

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

Metadata_Access_Constraints: none

Metadata_Use_Constraints:

This metadata record may have been copied from the SOFIA website and may not be the most recent version. Please check <https://sofia.usgs.gov/metadata> to be sure you have the most recent version.

U.S. Department of the Interior, U.S. Geological Survey
Comments and suggestions? Contact: Heather Henkel - Webmaster