FLORIDA GEOGRAPHIC DATA LIBRARY DOCUMENTATION

TITLE: BRIDGE STRUCTURES IN FLORIDA - 2019

Geodataset Name:       GC_BRIDGES_JUN19
Geodataset Type:       SHAPEFILE
Geodataset Feature:    Point
Feature Count:         10545
GENERAL DESCRIPTION:
This dataset contains 2019 Bridge Structure (point) location information for the State of Florida. This bridge layer focuses mainly on bridges over water, for the complete National Bridge Inventory (NBI) point layer please see the FGDL layer BTS_BRIDGE. This dataset is a combination of bridge structures from 4 different sources, and it is derived from the GC_BRIDGES_APR19 line layer. The data contains selected fields denoting the name, bridge id, roadway, physical location, and other structure information for bridges located in Florida. Please Note: This layer can be joined to the NBI BTS_BRIDGE layer via the BRIDGE_ID field and the ITEM8 field in the NBI. This data is meant to be used for planning purposes only and is not intended to represent a 100% inventory of bridges in Florida. Bridge locations that have been verified are marked with the letter V in the FLAG field.
DATA SOURCE(S):                    University of Florida GeoPlan Center
SCALE OF ORIGINAL SOURCE MAPS:     Varies
GEODATASET EXTENT:                 State of Florida
PUBLICATION DATE: 20190605 TIME PERIOD OF CONTENT: 20190605 DOWNLOAD LINK: http://www.fgdl.org/metadataexplorer/explorer.jsp

FEATURE ATTRIBUTE TABLES:

Datafile Name: GC_BRIDGES_JUN19.DBF
ITEM NAME WIDTH TYPE
OBJECTID
4 OID
Shape
4 Geometry
BRIDGE_ID
20 String
SHPOSITEID
10 String
ROADWAY
25 String
NAME
100 String
CITY
40 String
ZIPCODE
8 Double
COUNTY
35 String
FDOT_DIST
20 String
TYPE
55 String
DESIGNTYPE
50 String
NOTES
100 String
FSOURCE
100 String
DATASOURCE
100 String
H_LINK
150 String
XMIN
8 Double
YMIN
8 Double
XMAX
8 Double
YMAX
8 Double
LAT_DD
8 Double
LONG_DD
8 Double
MGRS
15 String
GOOGLEMAP
100 String
GCID
8 Double
LEN_FT
8 Double
DESCRIPT
100 String
FLAG
5 String
UPDATE_DAY
36 Date
FGDLAQDATE
36 Date
AUTOID
4 Integer

FEATURE ATTRIBUTE TABLES CODES AND VALUES:

Item
Item Description
OBJECTID Internal feature number.

Shape Feature geometry.

BRIDGE_ID A 15 digit structure number unique for each bridge within the state. Referred to as Item 8 in BTS - US DOT FHWA NATIONAL BRIDGE INVENTORY (NBI) and STRUCTURE _ in RCI BRIDGES.

SHPOSITEID The official state site number assigned by the Florida Master Site File. The state site number is an eight character string containing a two character county code, a five character numeric code, and an optionalsingle letter character suffix (suffix letter is generally used to indicate sites that are functionally or spatially related). Referred to as SITEID in SHPO_BRIDGES.

ROADWAY A unique 8-character identification number assigned to a roadway or section of a roadway either On or Off the State Highway System for which information is maintained in the Department's Roadway Characteristics Inventory (RCI).

NAME Based on NBI table information, created from the concatenation of [ITEM6A] & " BRIDGE" & " [" & [ITEM7] & " - " & [ITEM9] & "]".

CITY City of structure's physical location.

ZIPCODE US postal delivery designation of structure's physical location.

COUNTY County of structure's physical location.

FDOT_DIST The Florida Department of Transporation District containing the source feature.

TYPE The type of service under the bridge (NBI ITEMS 42B). https://nationalbridges.com/nbiDesc.html#ITEM_42B
Code = Definition

1 = Highway, with or without pedestrian

2 = Railroad

3 = Pedestrian-bicycle

4 = Highway-railroad

5 = Waterway

6 = Highway-waterway

7 = Railroad-waterway

8 = Highway-waterway-railroad

9 = Relief for waterway

0 = Other


DESIGNTYPE Type of Design, Main (NBI ITEMS 43B). https://nationalbridges.com/nbiDesc.html#ITEM_43B
Code = Definition

01 = Slab

02 = Stringer/Multi-beam or girder

03 = Girder and floorbeam system

04 = Tee beam

05 = Box beam or girders - Multiple

06 = Box Beam or girders - Single or Spread

07 = Frame

08 = Orthotropic

09 = Truss - Deck

10 = Truss - Thru

11 = Arch - Deck

12 = Arch - Thru

13 = Suspension

14 = Stayed girder

15 = Movable - Lift

16 = Movable - Bascule

17 = Movable - Swing

18 = Tunnel

19 = Culvert

20* = Mixed types, *  Applicable to only approach spans

21 = Segmental box girder

22 = Channel beam

00** = Other, **  Applicable to only main spans

99 = Miscoded data


NOTES Reviewers notes on individual features.

FSOURCE Feature Spatial Source

DATASOURCE Feature Data/Tabular Source

H_LINK Link To: Historic Highway Bridges of Florida 2010 (.PDF File). https://fdotwww.blob.core.windows.net/sitefinity/docs/default-source/environment/pubs/historic-highway-bridges-of-florida-2010-update.pdf

XMIN Minimum X-coordinate of the line extent in FGDL Albers

YMIN Minimum Y-coordinate of the line extent in FGDL Albers

XMAX Maximum X-coordinate of the line extent in FGDL Albers

YMAX Maximum Y-coordinate of the line extent in FGDL Albers

LAT_DD Latitude in decimal degrees.

LONG_DD Longitude in decimal degrees.

MGRS Military Grid Reference System (MGRS) Coordinate of the Facility. The MGRS is the geocoordinate standard used by NATO militaries for locating points on the earth. The MGRS provides a means to represent any location on the surface of the Earth using an alphanumeric string. Hierarchical references are based on the Universal Transverse Mercator (UTM) coordinate system. The MGRS is used for the entire earth. http://mgrs-data.org/

GOOGLEMAP Webpage hyperlink to location in Google Maps.

GCID The GeoPlan Center identification number.

LEN_FT Length of bridge line feature in feet.

DESCRIPT Field added by FGDL based on NAME.

FLAG Type of update that occurred.
FNV = Future Not Verified.

NV = Not Verified.

V = Verified, in most cases this verification was based on ESRI/Google Imagery, Google Street View, and Parcel Data. The exact structure extents are not verified and the structure ID has not been verified via Google Street View.


UPDATE_DAY The date the data was last updated by the Source.

FGDLAQDATE The date FGDL acquired the data from the Source.

AUTOID Unique ID added by GeoPlan


USER NOTES:
This data is provided 'as is'. GeoPlan relied on the integrity
of the original data layer's topology
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.
National Bridge Inspection Standards

What is a bridge?
A bridge is defined in section 650.305 Definitions as "A structure including supports 
erected over a depression or an obstruction, such as water, highway, or railway, 
and having a track or passageway for carrying traffic or other moving loads, and 
having an opening measured along the center of the roadway of more than 20 feet 
between under copings of abutments or spring lines of arches, or extreme ends of 
openings for multiple boxes; it may also include multiple pipes, where the clear 
distance between openings is less than half of the smaller contiguous opening."

SOURCE: https://www.fhwa.dot.gov/bridge/nbis/

The data was created to serve as base information for use in GIS systems for
a variety of planning and analytical purposes.

This data is provided 'as is' and its horizontal positional accuracy
has not been verified by GeoPlan

This data is provided 'as is' and its vertical positional accuracy
has not been verified by GeoPlan

NONE

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:
Federal Highway Administration:
https://www.fhwa.dot.gov/

The Recording and Coding Guide for the Structure Inventory and Appraisal
of the Nation's Bridges
Report No. FHWA-PD-96-001
https://www.fhwa.dot.gov/bridge/mtguide.pdf

National Bridge Inventory [NBI] - Data Dictionary
https://nationalbridges.com/nbiDesc.html

The Historic Highway Bridges of Florida - 2010
https://fdotwww.blob.core.windows.net/sitefinity/docs/default-source/environment/pubs/historic-highway-bridges-of-florida-2010-update.pdf

DATA LINEAGE SUMMARY:
GeoPlan Center Process Steps (June 5th, 2019):
Bridge locations and information were obtained from the BTS_bridge point 
layer, ETAT_bridge line layer and the FHWA NBI 2015. 

A selection was done on the BTS_bridge point layer based off a field named 
Item 42 which indicates what is under a bridge. From this "5, 6, 7, 8, 9, and 0" 
(all indicating water under a bridge) were selected out of the layer in a 
standalone shapefile.

Each BTS_bridge point was individually inspected to verify whether or not the 
bridge point was accurate, while creating a line feature extent either manually or 
based on RCI_Roads where not available, for each point.

Bridge locations were checked using imagery and Google Street View and either 
marked as Verified, Not Verified, or Future Not Verified in the FLAG field, please see 
the FLAG field Attribute Definition for more information. (some were noted in the NOTES 
field as "95%" likely which indicates) that everything was likely correct but a visual verification 
check was not confirmed.

A SHPO SITE ID was added to each bridge feature where applicable. 

A Roadway ID was added to each bridge line feature from an RCI roadway 
data set where it could be applied.

An H_LINK field was added for the purpose of linking to PDF files taken from the 
FDOT Historic Highway Bridges of Florida 2010 (.PDF File). PDF's can be accessed 
at the following location: https://www.geoplan.ufl.edu/agol/pdf/FDOT_Bridge_Id_PDFs/

More bridges were added with the same review process from FHWA NBI 2015. 

Next GeoPlan Center performed the following attribute table adjustments.
-Upper cased all records.
-Added DESCRIPT field based on NAME.
-Added and Calculated Lat_DD, Long_DD, MGRS,  XMIN, 
 YMIN, XMAX, YMAX.
-Added and Calculated LEN_FT.
-Added FGDLAQDATE based on the date GeoPlan acquired the 
  data from the Source.
-Socio-Cultural Effect data fields and definitions were added. 
 FLAG, UPDATE_DAY, CITY, ZIPCODE, COUNTY, 
 FDOT DISTRICT, FGDLAQDATE.

Finally, the lines were converted into points using Feature to Point, which utilizes the 
center of the line feature to create each point feature.
Process Date: 20190605

Dataset copied. Process Date: 20190621
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:
University of Florida GeoPlan Center
GeoPlan
131 ARCH BLDG
Gainesville, FL
32611


https://www.fgdl.org data@fgdl.org Kate Norris

FGDL CONTACT:
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
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