FLORIDA GEOGRAPHIC DATA LIBRARY DOCUMENTATION

TITLE: FLORIDA EXTENT OF THE 1,000 METER, UNITED STATES NATIONAL GRID FOR NAD83 UTM ZONE 16N.

Geodataset Name:       USNG_FL_1K_UTM16R
Geodataset Type:       SHAPEFILE
Geodataset Feature:    Polygon
Feature Count:         116753
GENERAL DESCRIPTION:
This layer represents a 1,000 by 1,000 meter United States National Grid (USNG) for those portions of Florida falling within the NAD83 UTM 16 N zone. The USNG is an alpha-numeric reference system based on the UTM coordinate system and is similar to the Military Grid Reference System. Use of the USNG ensures a uniform grid mapping and positional reporting system for search and rescue, emergency planning, response, and recovery.
DATA SOURCE(S):                    University of Florida GeoPlan Center
SCALE OF ORIGINAL SOURCE MAPS:     N/A
GEODATASET EXTENT:                 Florida NAD83 UTM Zone 16 N (Panhandle)
PUBLICATION DATE: 20090505 TIME PERIOD OF CONTENT: 20070426 DOWNLOAD LINK: http://www.fgdl.org/metadataexplorer/explorer.jsp

FEATURE ATTRIBUTE TABLES:

Datafile Name: USNG_FL_1K_UTM16R.DBF
ITEM NAME WIDTH TYPE N. DECIMAL DEGREES
FID
4 OID ---
Shape
0 Geometry ---
X_LWRLFT
19 Number 11
Y_LWRLFT
19 Number 11
GRID100K
2 String ---
GRID10K
3 String ---
GRID1000M
5 String ---
LABEL
7 String ---
DESCRIPT
10 String ---
FGDLAQDATE
8 Date ---

FEATURE ATTRIBUTE TABLES CODES AND VALUES:

Item
Item Description
FID Internal feature number.

Shape Feature geometry.

X_LWRLFT X coordinate of the lower left hand corner of the polygon.

Y_LWRLFT Y coordinate of the lower left hand corner of the polygon.

GRID100K 100,000-meter Square Identification; for regional areas, identified by two letter values.

GRID10K 10,000-meter grid label for the local area.

GRID1000M 1,000-meter grid label for the local area.

LABEL Concatenated 100K grid label and 1000 meter grid label.

DESCRIPT Based on "16R" & LABEL.

FGDLAQDATE The date FGDL acquired the data from the source.


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.
How to Read a United States National Grid (USNG) Spatial Address
http://www.fgdc.gov/usng/how-to-read-usng/index_html
---------------------------------------------------------------

The USNG is an alpha-numeric reference system that overlays the UTM 
coordinate system.  A USNG spatial address is broken down into three parts, the;
 - Grid Zone Designation; for a world-wide unique address.
 - 100,000-meter Square Identification; for regional areas.
 - Grid Coordinates; for local areas. 

4 digits - 2306 - locates a point with a precision of 1,000-meters (a neighborhood size area).
6 digits - 234064 - locates a point with a precision of 100-meters (a soccer field size area).
8 digits - 23480647 - locates a point with a precision of 10-meters (the size of a  modest home).
10 digits - 2348306479 - locates a point with a precision of 1-meter (within a parking spot).

To review, we can see a complete US National Grid spatial address 
contains three parts as we drill down to a unique location,  18S UJ 23480647
 - Grid Zone Designation (i.e. 18S).
 - 100,000-meter Square Identification (i.e. UJ ).
 - Grid coordinates of some even number of digits ranging from 2 to 10 
(i.e. 23480647  In this case, eight digits identify a place of about the size 
of a modest home.).  You always read right, then up when plotting coordinates. 

A spatial address is customarily written as a single string of values.  
Note how the horizontal datum (NAD 83) has been included: 
USNG: 18SUJ23480647 (NAD 83)


Floridadisaster.org
---------------------------------------------------------------
In an effort to standardize maps in Florida for both emergency and 
other operations, the State Fire Marshal, as the coordinating agency 
for search and rescue under the State Comprehensive Emergency 
Management Plan, and the Division of Emergency Management are 
embarking on a program to adopt the US National Grid (USNG) as the 
standard in Florida. This project will ensure a uniform grid mapping 
system across cities and counties in Florida, and will match the system 
used by the National Guard, the US Coast Guard and the US military 
when they are deployed into our state.

Florida s unique geography of miles of coastlines, multiple river corridors, 
and large watersheds make the use of the common 
Township/Range/Section grid (PLSS) all but impossible except for 
a handful of inland counties. As the grid approaches wetlands, river 
corridors and the coast line, sections become irregular in shape and 
can be significantly larger than the typical square mile, which is too 
large to accommodate the needs of ground crews.

Adoption of a national grid system has been identified as  critical  
in a number of after action reports, investigations and studies 
dating as far back as Hurricane Andrew. FEMA, DHS, the National 
GeoSpatial Intelligence Agency, and the Federal Geographic Data 
Committee all promote the adoption of the USNG. 

Grid cell values are unique and sequentially numbered.

The grid serves as a common means for providing locational information in 
relation to USNG coordinates.

The grid's horizontal accuracy was mathematically generated and is 
accurate to the internal precision of ArcGIS 9.2 coordinates.

The grid's vertical accuracy was mathematically generated and is 
accurate to the internal precision of ArcGIS 9.2 coordinates.

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:
Florida State Emergency Response Team
United States National Grid
http://floridadisaster.org/gis/usng/

Guidelines for Building US National Grid Polygons with ArcGIS
http://floridadisaster.org/gis/usng/Documents/build_usng_polygons.pdf

DATA LINEAGE SUMMARY:
The University of Florida GeoPlan Center produced this grid in an ArcMap 
data viewer with the coordinate system set to NAD_83_UTM_Zone_16N. 
A 1,000-meter by 1,000 grid was generated, using the XTools Fishnet function 
and covering the area of Florida contained within the UTM 16 N zone. 
Overlap was included for use in neighboring areas.

Next the XTools Add XY function was used to produce X and Y coordinates 
for each polygon.

Added fields: X_LWRLFT, Y_LWRLFT, GRID100K, GRID10K, GRID1000M, LABEL, DESCRIPT, FGDLAQDATE, and AUTOID.

Calculated the AUTOID field as follows;
[FID] + 250,001

Created Centroids for the 1000M Grid and spatially joined it to the existing 
usng_fl_10k_utm16.shp Grid.

Joined the Centroids with the 10K Grid information back to the 1000M Grid, 
via a table join based on AUTOID.

Calculated the GRID100K field based on the joined GRID100K field from the Centroids.

Calculated the GRID10K field based on the joined GRID10K field from the Centroids.

Calculate X_LWRLFT and Y_LWRLFT values as follows;
Round ( [XCOORD] - 500, 0 ) 
Round ( [YCOORD] - 500, 0 )
After these calculations, the XCOORD and YCOORD fields may be deleted.

Calculate GRID1000M as follows;
Mid ( [X_LWRLFT] , 2, 2 ) + " " + Mid ( [Y_LWRLFT] , 3 ,2 )

Calculate LABEL as follows;
[GRID100K] + " " + Mid ( [X_LWRLFT] , 2, 2 ) + Mid ( [Y_LWRLFT] , 3 ,2 )

Calculated DESCRIPT based on LABEL.

After field calculations were completed the join was removed.

For more information on field calculations please see 
Guidelines for Building US National Grid Polygons with ArcGIS
http://floridadisaster.org/gis/usng/Documents/build_usng_polygons.pdf
Process Date: 20070426

The University of Florida GeoPlan Center updated the dataset on May 5th, 2009. Features falling completely outside the UTM Zone 16R were removed and a clip function was used where features fell withing both the UTM ZONE 16R and 17R to remove overlaping features between the two zones. The DESCRIPT field was updated by adding the UTM Zone designation to the front of the feature description. I.E. - "16R" & [LABEL] Process Date: 20090505
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
431 ARCH BLDG
Gainesville, FL
32611


http://www.fgdl.org/metadataexplorer data@fgdl.org

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

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