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FLORIDA GEOGRAPHIC DATA LIBRARY DOCUMENTATION VERSION 2007 TITLE: FLORIDA EXTENT OF THE 100,000 METER, UNITED STATES NATIONAL GRID Geodataset Name: FL_USNG_100K Geodataset Type: SHAPEFILE Geodataset Feature: Polygon Feature Count: 37 |
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GENERAL DESCRIPTION:
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DATA SOURCE(S): Florida Division of Emergency Management SCALE OF ORIGINAL SOURCE MAPS: N/A DATE OF AUTOMATION OF SOURCE: 20070102 GEODATASET EXTENT: State of Florida |
FEATURE ATTRIBUTE TABLES:
Datafile Name: FL_USNG_100K.DBF
| ITEM NAME | WIDTH | TYPE |
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OBJECTID
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4 | OID |
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GRID1MIL
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3 | String |
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GRID100K
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2 | String |
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LABEL
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8 | String |
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DESCRIPT
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8 | String |
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FGDLAQDATE
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8 | Date |
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AUTOID
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4 | Number |
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SHAPE
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4 | Geometry |
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SHAPE.AREA
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0 | Double |
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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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| GRID1MIL |
Grid UTM Zone Designation. |
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| GRID100K |
100,000-meter Square Identification; for regional areas, identified by two letter values. |
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| LABEL |
Concatenated GRID1MIL label and GRID100K label. |
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| DESCRIPT |
Based on LABEL. |
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| FGDLAQDATE |
The date FGDL acquired the data from the source. |
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| AUTOID |
GeoPlan internal feature identification number. |
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| SHAPE |
Feature geometry. |
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| SHAPE.AREA |
Area in meters |
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| SHAPE.LEN |
Perimeter in meters |
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. This data is for planning purposes only. Particularly near the junction of the UTM 16N and 17N zones, results may vary. |
The grid's horizontal accuracy was mathematically generated and is accurate to the internal precision of ArcGIS 9.1 coordinates. |
The grid's vertical accuracy was mathematically generated and is accurate to the internal precision of ArcGIS 9.1 coordinates. |
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 |
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 |
This grid is modified from original grids provided by Delta University. 100,000 by 100,000 meter grids were created for the UTM 16N and UTM 17N zones within Florida. These grids were reprojected into Albers and merged, subtracting overlap at the zones junction. 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 Creating USNG Polygons http://www.floridadisaster.org/gis/USNG/Documents/Creating_USNG%20Polygons.pdf Process Date: 20070102 |
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:
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Florida Division of Emergency Management FDEM 2555 Shumard Oak Boulevard Tallahassee, FL 32399-2100 850-413-9907 |
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