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

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Metadata:

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: <http://sofia.usgs.gov/eden/models/groundelevmod-edenapps.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.


This file is intended specifically for use in the EDEN applications software. Therefore, it is a modification of the EDEN DEM released in January of 2010 (i.e., eden_em_ja10). The released January 2010 data was modified by converting elevation values from meters (m) to centimeters (cm). In a previous release of this data set (eden_em_cm_ja10-notch) data was removed from the southern Big Cypress National Preserve and northwestern Everglades National Park area so that the DEM boundary matched the EDEN boundary. However, a new version of the EDEN water surface boundary has been released in October 2011, and provided for the release of eden_em_cm_ja10 which has the area of southern Big Cypress National Preserve and northwestern Everglades National Park filled in so that it now matchs the current water surface model in that area. Aside from this difference in units, the following data documentation applies.
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: -81.4
East_Bounding_Coordinate: -80.2
North_Bounding_Coordinate: 26.7
South_Bounding_Coordinate: 25.2
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:
<http://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:
<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: NetCDF file
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: <http://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: <http://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).
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). 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 on p. 3-38 (p. 36 in the pdf file) at <http://www.evergladesplan.org/pm/recover/recover_docs/map/MAP_3.1_GE.pdf>. 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.
This file is a modification of the eden dem created in January of 2010 (i.e., eden_em_jan10) in which the elevation values have been converted from meters (m) to centimeters (cm) for use by EDEN applications software. Inconsistencies in available greater Everglades boundary files resulted in a missing elevation value for 1 cell along the western boundary of WCA3. In this release, that single cell was "filled" with a value of 219.682 centimeters as determined through the kriging process. This file is intended specifically for use in the EDEN applications software.
Process_Date: 2011
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
Process_Step:
Process_Description:
The DEM with elevations in meters was converted to a NetCDF file with the elevations in centimeters for use with the EDENapps. The conversion was done with the R programming language and ncdf library.
Process_Date: 201110
Process_Contact:
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
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: 1
Altitude_Distance_Units: centimeters
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
The CF-compliant metadata in the header of the NetCDF file provides spatial information for projecting the data into a GIS as well as the start date and time step for the time-series of data in the file. It also provides information about the conventions used for attributes in the dataset and the source software used to create the dataset.
Entity_and_Attribute_Detail_Citation:
NetCDF Climate and Forecast (CF) Metadata Conventions, Version 1.0, 28 October, 2003 at <http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.0/>
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_ CM_OC11
Distribution_Liability: No warrantees are implied or explicit for the data
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: netCDF
Format_Version_Number: CF-1.0
Format_Information_Content:
The file contains the netCDF file for the cm version of the October 2011 EDEN DEM
File_Decompression_Technique: The file is zipped and must be unzipped before use
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://sofia.usgs.gov/eden/models/groundelevmod-edenapps.php>
Access_Instructions: The file may be downloaded from the SOFIA website
Fees: none
Metadata_Reference_Information:
Metadata_Date: 20111215
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 <http://sofia.usgs.gov/metadata> to be sure you have the most recent version.
Generated by mp version 2.9.14 on Fri Dec 16 11:53:28 2011

U.S. Department of the Interior, U.S. Geological Survey
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