Geodataset Name:       CTDS_2004
Geodataset Type:       SHAPEFILE
Geodataset Feature:    Polygon
Feature Count:         163019

DATA SOURCE(S):                    Florida Geological Survey
SCALE OF ORIGINAL SOURCE MAPS:     24000
GEODATASET EXTENT:                 State of Florida

PUBLICATION DATE:                  2004
TIME PERIOD OF CONTENT:            2004
DOWNLOAD LINK:                     http://www.fgdl.org/metadataexplorer/explorer.jsp

FEATURE ATTRIBUTE TABLES:

Datafile Name: CTDS_2004.DBF

FEATURE ATTRIBUTE TABLES CODES AND VALUES:

Item	Item Description
OBJECTID	Internal feature number.
Shape	Feature geometry.
FLORIDA_CT	Internal feature number.
FLORIDA__1	User-defined feature number.
ZVALUES	Polygon centroid elevation.
DESCRIPT	FGDL added field based on ZVALUES
FGDLAQDATE	The date FGDL acquired the data from the source
AUTOID	Unique ID added by GeoPlan
SHAPE.AREA	Area in meters
SHAPE.LEN	Perimeter in meters

USER NOTES:

Consistency of the data was verified by random checks of 1:24,000 USGS topographic rasters.

This data is provided 'as is' by GeoPlan and is complete to our knowledge.

GeoPlan relied on the integrity of the attribute information within the original data.

This layer is used as an input dataset in the Florida Aquifer Vulnerability Assessment (FAVA) model. Ground-water vulnerability is dependent upon the rate at which water reaches the aquifer system. In Florida, sinkholes generally provide preferential pathways for water and contaminants to travel to aquifer systems more rapidly from land surface. As a result, aquifer vulnerability increases in areas of relatively dense karst topography. It is well beyond the scope of [the FAVA study] to map every sinkhole or karst-related feature in Florida; however, a surrogate data coverage was available from the FDEP DEM that reflects areas with a high population of karst features. During development and enhancement of FDEP DEM, closed hachured topographic depressions were attributed. For areas with multiple encircling hachured contour lines, only the outermost depression was selected. These lines were converted to polygons which were used to create a statewide data coverage of closed topographic depressions. This coverage was filtered for each aquifer system and used as input into the WoW - FAVA model. These filtering processes are described in Results - FA VA Model Outputs for each aquifer system. Although not all closed topographic depressions are karst features, there is a strong correlation between the density of depressions on USGS 7.5-minute quadrangle maps and areas that include sinkholes of various types. In addition to spatial filtering for the lAS and FAS, other enhancements to this coverage are yet to be completed. These enhancements, however, are not expected to significantly change the results of the FAVA response themes. For more information on the FAVA model and its complete methodology please see http://www.dep.state.fl.us/geology/programs/hydrogeology/fava.htm. Alternatively see the final report at http://publicfiles.dep.state.fl.us/FGS/WEB/fava/fava_final_dep_report/FAVA_REPORT_MASTER_DOC_3-21-05.pdf

Data developed to locate all closed/internally drained areas mapped on 1:24,000 topographic maps. Dataset taken from latest available USGS 7.5' quadrangle maps.

Consistent with the USGS 1;24 000 topographic maps

Consistent with the USGS 1;24 000 topographic maps

DISCLAIMER This geologic data was developed by the Florida Department of Environmental Protection (FDEP) - Florida Geological Survey (FGS) to carry out agency responsibilities related to management, protection, and development of Florida's natural resources. Although efforts have been made to make the information accurate and useful, the FDEP/FGS assumes no responsibility for errors in the information and does not guarantee that the data are free from errors or inaccuracies. Similarly FDEP/FGS assumes no responsibility for the consequences of inappropriate uses or interpretations of the data. As such, these digital data are distributed on "as is" basis and the user assumes all risk as to their quality, the results obtained from their use, and the performance of the data. FDEP/FGS bears no responsibility to inform users of any changes made to this data. Anyone using this data is advised that precision implied by the data may far exceed actual precision. Comments on this data are invited and FDEP/FGS would appreciate that documented errors be brought to staff attention. The development of these data sets represents a major investment of staff time and effort. As a professional responsibility, we expect that the FDEP/FGS will receive proper credit when you utilize these data sets. Further, since part of this data was developed and collected with U.S. Government or State of Florida funding, no proprietary rights may be attached to it in whole or in part, nor may it be sold to the U.S. Government or the Florida State Government as part of any procurement of products or services.

The Florida Geographic Data Library is a collection of Geospatial Data compiled by the University of Florida GeoPlan Center with support from the Florida Department of Transportation. GIS data available in FGDL is collected from various state, federal, and other agencies (data sources) who are data stewards, producers, or publishers. The data available in FGDL may not be the most current version of the data offered by the data source. University of Florida GeoPlan Center makes no guarantees about the currentness of the data and suggests that data users check with the data source to see if more recent versions of the data exist. Furthermore, the GIS data available in the FGDL are provided 'as is'. The University of Florida GeoPlan Center makes no warranties, guaranties or representations as to the truth, accuracy or completeness of the data provided by the data sources. The University of Florida GeoPlan Center makes no representations or warranties about the quality or suitability of the materials, either expressly or implied, including but not limited to any implied warranties of merchantability, fitness for a particular purpose, or non-infringement. The University of Florida GeoPlan Center shall not be liable for any damages suffered as a result of using, modifying, contributing or distributing the materials. A note about data scale: Scale is an important factor in data usage. Certain scale datasets are not suitable for some project, analysis, or modeling purposes. Please be sure you are using the best available data. 1:24000 scale datasets are recommended for projects that are at the county level. 1:24000 data should NOT be used for high accuracy base mapping such as property parcel boundaries. 1:100000 scale datasets are recommended for projects that are at the multi-county or regional level. 1:125000 scale datasets are recommended for projects that are at the regional or state level or larger. Vector datasets with no defined scale or accuracy should be considered suspect. Make sure you are familiar with your data before using it for projects or analysis. Every effort has been made to supply the user with data documentation. For additional information, see the References section and the Data Source Contact section of this documentation. For more information regarding scale and accuracy, see our webpage at: http://geoplan.ufl.edu/education.html

REFERENCES:

Florida Aquifer Vulnerability Assessment (FAVA): Contamination potential of Florida's principal aquifer systems report: http://publicfiles.dep.state.fl.us/FGS/WEB/fava/fava_final_dep_report/FAVA_REPORT_MASTER_DOC_3-21-05.pdf Florida Geological Survey - Hydrogeology Section Homepage: http://www.dep.state.fl.us/geology/programs/hydrogeology/hydro_index.htm Florida Aquifer Vulnerability Assessment (FAVA) Information Page: http://www.dep.state.fl.us/geology/programs/hydrogeology/fava.htm

DATA LINEAGE SUMMARY:

Convert arcs to polygons and dissolving inner polygons in areas where multiple hachured depressions occur. Process Date: August 31, 2004 Paper USGS 1:24,000 quadrangles scanned and georeferenced. Process Date: Metadata created and revised. Process Date: Unknown GeoPlan downloaded this dataset from the Florida Department of Environmental Protection's FAVA GIS data download site (http://www.dep.state.fl.us/geology/programs/hydrogeology/fava_gis_data.htm) in June 2011. The data was downloaded in shapefile format and was in the following projection: Albers NAD 83 HARN. During the AQ/QC process the following tasks were undertaken: - Deleted the following fields: AREA, PERIMITER, STATE_CTD_, STATE_CTD1, DISSOLVE, and AUTO_ID10. - A DESCRIPT field was added based on ZVALUES - A FGDLAQDATE field was added based on the date FGDL downloaded the data from the source. - Renamed file from ctds to ctds_2004. Process Date: 20110608

MAP PROJECTION PARAMETERS:

Projection                          ALBERS
Datum                               HPGN
Units                               METERS
Spheroid                            GRS1980
1st Standard Parallel               24  0  0.000
2nd Standard Parallel               31 30  0.000
Central Meridian                   -84 00  0.000
Latitude of Projection's Origin     24  0  0.000
False Easting (meters)              400000.00000
False Northing (meters)             0.00000

DATA SOURCE CONTACT (S):

Name:
Abbr. Name:
Address:


Phone:

Web site:
E-mail:
Contact Person:
         Phone:
        E-mail:

Florida Department of Environmental Protection, Florida Geological Survey
FDEP
903 W. Tennessee St., Gunter Bldg. MS720
Tallahassee, Florida
32304
850.488.4191


http://www.dep.state.fl.us/geology/programs/hydrogeology/disclaimer/dis_clos_topo_dep.htm
David.Anderson@dep.state.fl.us
David Anderson

Name:                   FLORIDA GEOGRAPHIC DATA LIBRARY
Abbr. Name:             FGDL
Address:                Florida Geographic Data Library
                        431 Architecture Building
                        PO Box 115706
                        Gainesville, FL  32611-5706
Web site:               http://www.fgdl.org

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