FLORIDA GEOGRAPHIC DATA LIBRARY DOCUMENTATION VERSION 2007 TITLE: FLORIDA'S STATEWIDE SEAGRASS Geodataset Name: SEAGRS_2007 Geodataset Type: SHAPEFILE Geodataset Feature: Polygon Feature Count: 20528 |
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GENERAL DESCRIPTION:
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DATA SOURCE(S): Florida Fish and Wildlife Conservation Commission-Fish and Wildlife Research Institute, Center for Spatial Analysis SCALE OF ORIGINAL SOURCE MAPS: Unknown DATE OF AUTOMATION OF SOURCE: 2007 GEODATASET EXTENT: State of Florida |
FEATURE ATTRIBUTE TABLES:
Datafile Name: SEAGRS_2007
ITEM NAME | WIDTH | TYPE |
OBJECTID
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4 | OID |
SEAGRASS
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20 | String |
SOURCEDATE
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20 | String |
METADATA
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254 | String |
DESCRIPT
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20 | String |
FGDLAQDATE
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8 | Date |
SHAPE
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4 | Geometry |
AUTOID
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4 | Integer |
SHAPE.AREA
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0 | Double |
SHAPE.LEN
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0 | Double |
FEATURE ATTRIBUTE TABLES CODES AND VALUES:
Item | Item Description | |
OBJECTID |
Internal feature number. |
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SEAGRASS |
Description of seagrass density
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SOURCEDATE |
Ground condition date of source data. |
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METADATA |
This field will contain a hyperlink to metadata for the source data of each polygon. Currently it is the source data set name used as a placeholder. |
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DESCRIPT |
FGDL added field based on SEAGRASS |
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FGDLAQDATE |
FGDL added field based on date downloaded from source. |
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SHAPE |
Feature geometry. |
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AUTOID |
Unique ID added by GeoPlan |
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SHAPE.AREA |
Area in meters |
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SHAPE.LEN |
Perimeter in meters |
These data appear logically consistent. Geodatabase topology was run to detect overlapping polygons - none are present. Some slivers may be present. |
These data are complete as of data available to FWRI on October 11, 2007. The study areas for the source data varied. Offshore data have not been mapped to any consistent distance or depth statewide. Two significant data gaps have been filled since the previous statewide compilation - Broward and Collier counties are now included. However, these counties were mapped using field measurements, rather than complete aerial photography, so additional unmapped seagrass may still be present within these counties. Additional data gaps may be present. Contact GIS Librarian to request extent of mapping. |
GeoPlan relied on the integrity of the attribute information within the original data. |
Prior to July 1, 2004, the Fish and Wildlife Research Institute (FWRI) was known as the Florida Marine Research Institute (FMRI). The institute name has not been changed in historical data sets or references to work completed by the Florida Marine Research Institute. The institute name has been changed in references to ongoing research, new research, and contact information. These data are for statewide mapping and analysis only. The original regional data sets may contain more detailed seagrass attribution schemes. Contact GIS Librarian to request the source data sets. |
This GIS data set was developed to represent the most recent seagrass mapping available in Florida for current statewide display and analysis. Not all areas have been mapped. This data set includes areas that were not previously mapped in other statewide compilations. This data set is not appropriate for time series comparisons to previous statewide compilations. |
Positional accuracy varies according to source data. No positional alterations have been performed for this compilation. |
This data is provided 'as is' and its vertical positional accuracy has not been verified by GeoPlan |
Acknowledgment of the Florida Fish and Wildlife Conservation Commission-Fish and Wildlife Research Institute as the data source would be appreciated in any products developed from these data, and such acknowledgment as is standard for citation and legal practices for data source is expected by users of this data. Please cite the original metadata when using portions of the record to create a similar record of slightly altered data, such as reprojection. If any data are modified or adjusted, please share the edited information with FWC. Users should be aware that comparison with other data sets for the same area from other time periods may be inaccurate due to inconsistencies resulting from changes in mapping conventions, data collection, and computer processes over time. FWC shall not be liable for improper or incorrect use of this data. These data are not legal documents and are not to be used as such. This is not a survey data set and should not be utilized as such. These data are not to be used for navigation. THE DATA INCLUDED IN FGDL ARE 'AS IS' AND SHOULD NOT BE CONSTRUED AS LEGALLY BINDING. 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 |
For more information contact the Florida Fish and Wildlife Conservation Commission-Fish and Wildlife Research Institute, Division of Marine Fisheries Management (DMFM) GIS data librarian at gislibrarian@myfwc.com http://ocean.floridamarine.org/mrgis/viewer.htm |
FWRI staff added three attributes to each data set:SEAGRASS - indicates ?continuous? or ?discontinuous?. If a seagrass data set only indicated presence/absence this attribute defaulted to discontinuous. SOURCEDATE - year(s) of photography. Also indicates if date is unknown or if the polygon was not interpreted from photography. METADATA - the information in this field will be populated with a link to the metadata for the source data set that the polygon came from once the source metadata is online. Currently it is the source data set name used as a placeholder. Staff used the most recent information for an area. Staff determined the most recent information by creating footprints of all source polygons, minus any large land polygons and uninterrupted areas. Staff used these footprints with the ArcGIS Toolbox 9.1 command ? erase? to eliminate areas of overlap from older source data sets. In some areas the exclusion of shoreline resulted in sliver polygons due to different studies using different shorelines. Staff manually deleted these slivers after the ?erase?, defaulting to the more recent shoreline coverage. Once all the data were erased, staff loaded all of the data into a single geodatabase feature class. Running a topology resulted in no overlaps. If an area was uninterrupted within a more recent study, but interpreted in an older study, then the older study was used. The first draft did not include areas from older data sets in the turbid areas within benthic_flbay_2004. To correct this, staff extracted the data from the benthic_south_fl and the seagrass_swcoast_fl_1987 using the ?clip? and ? erase? tools in order to fill in the gaps. Sliver polygons less than one square meter were erased. Any additional slivers are either due to preserving the "Source" attribute or they were present in the original source data sets. Process Date: 2007 |
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 Fish and Wildlife Conservation Commission-Fish and Wildlife Research Institute FFWCC_FWRI Fish and Wildlife Research Institute, 100 Eighth Avenue Southeast St. Petersburg, Florida 33701 727-896-8626 |
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 Contact FGDL: Technical Support: http://www.fgdl.org/fgdlfeed.html FGDL Frequently Asked Questions: http://www.fgdl.org/fgdlfaq.html FGDL Mailing Lists: http://www.fgdl.org/fgdl-l.html For FGDL Software: http://www.fgdl.org/software.html