FLORIDA GEOGRAPHIC DATA LIBRARY DOCUMENTATION
VERSION 2006
TITLE: AM TOWER STRUCTURES
Geodataset Name: AMTOW Geodataset Type: SHAPE Geodataset Feature: POINT
GENERAL DESCRIPTION:
This dataset contains the locations of AM tower structures in the state of Florida.
DATA SOURCE(S): Federal Communications Commission SCALE OF ORIGINAL SOURCE MAPS: UNKNOWN DATE OF AUTOMATION OR SOURCE: September, 2001 GEODATASET EXTENT: State of FloridaFEATURE ATTRIBUTE TABLES:
Datafile Name:AMTOW.DBF ITEM NAME WIDTH TYPE PRECISION SHAPE 6 SHAPEPOINT 0 CALLSIGN 4 CHARACTER 0 AM_FREQ 19 DECIMAL 15 CITY_LIC 24 CHARACTER 0 STATE 2 CHARACTER 0 LICENSEE 36 CHARACTER 0 LAT 8 CHARACTER 0 LON 9 CHARACTER 0 CLASS 2 CHARACTER 0 DAYPOWER 19 DECIMAL 15 NITEPOWER 19 DECIMAL 15 DESCRIPT 36 CHARACTER 0
FEATURE ATTRIBUTE TABLES CODES AND VALUES:
ITEM ITEM DESCRIPTION
SHAPE Data attribute inherent to the ESRI shapefile format, which defines the
data as a point, polyline, or polygon.
CALLSIGN Callsign of facility or station (W = East of the Misssissippi)
AM_FREQ AM station frequncy. AM stations occupy the frequencies of 540 kHz to
1700 kHz. These stations are allocated on a non-interference basis.
CITY_LIC City location of "LICENSEE"
STATE State location of "LICENSEE"
LICENSEE Company or organization that holds the legal license from the Federal
Communications Commission.
LAT Latitude coordinate of AM radio tower in "degrees, minutes, seconds"
LON Longitude coordinate of AM radio tower in "degrees, minutes, seconds"
CLASS FCC given code. The AM band frequencies are divided into three
categories: Clear, Regional, and Local channels. The allowable classes
depend on a station's frequency, in addition to other variables. On
the Clear channels certain stations are specifically classified as
Class A stations or as Class B stations. The other stations have their
class determined by the frequency.
A = A Class A station is an unlimited time station (that is, it can
broadcast 24 hours per day) that operates on a clear channel. The
operating power shall not be less than 10 kilowatts (kW) or more
than 50 kW.
B = A Class B station is an unlimited time station. Class B stations
are authorized to operate with a minimum power of 0.250 kW (250
watts) and a maximum power of 50 kW. (If a Class B station operates
with less than 0.250 kW, the RMS must be equal to or greater than
141 mV/m at 1 km for the actual power.) If the station is
authorized to operate in the expanded band (1610 to 1700 kHz), the
maximum power is 10 kW.
C = A Class C station is an unlimited time station that operates on a
local channel. The power shall not be less than 0.25 kW nor more
than 1 kW. Class C stations that are licensed to operate with 0.100
kW may continue to operate as licensed.
D = A Class D station operates either daytime, limited time, or
unlimited time with a nighttime power less than 0.250 kW and an
equivalent RMS antenna field less than 141 mV/m at 1 km for the
actual power. Class D stations shall operate with daytime powers
not less than 0.250 kW nor more than 50 kW. NOTE: If a station
is an existing daytime-only station, its class will be Class D.
DAYPOWER According to the FCC "Daytime" is defined as the period of time
between local sunrise and local sunset. For more information on
"power" of AM radio stations or structures go to the FCC CODE OF
FEDERAL REGULATIONS, Title 47 Part 73.51 "Determining Operating Power"
(http://www.fcc.gov/mb/audio/bickel/amfmrule.html)
NITEPOWER According to the FCC "Nighttime" is defined as the period of time
between local sunset and local sunrise. For more information on
"power" of AM radio stations or structures go to the FCC CODE OF
FEDERAL REGULATIONS, Title 47 Part 73.51 "Determining Operating Power"
(http://www.fcc.gov/mb/audio/bickel/amfmrule.html)
DESCRIPT FGDL added item based on LICENSEE
USER NOTES:
AM stands for "Amplitude Modulation", which refers to the means of encoding the audio signal on the carrier frequency. In many countries, AM radio stations are known as "medium wave"(MW) stations. AM stations are also sometimes referred to as "standard broadcast stations", since AM was the first form used to transmit broadcast radio signals to the public. A note concerning data scale: Certain scale datasets are not suitable for some project, analysis, or modelling 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. 1:250000 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 analyses. 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 web pages at: http://www.geoplan.ufl.edu/education.html These data are based on interpretation of available information and should not be construed as legally binding.
FGDL QUALITY ASSURANCE STATUS:
-Reprojected data to FGDL Albers HPGN (See "Map Projection Parameters" below) -Upcased all character records -Changed original file name from "am" to "amtow" -DESCRIPT item was added based on the item LICENSEE
DATA LINEAGE SUMMARY:
This dataset was originally released by FCC in 2002. In 2002, it was downloaded by GeoPlan in shapefile format from the FCC website (http://wireless.fcc.gov/geographic/fcc_db.html) When received, the data was in the following projection: Geographic, Datum: NAD 27, Spheroid: Clarke1866, Units: Decimal Degrees. The shapefile was then clipped to the State of Florida, and projected to FGDL Albers HPGN.
MAP PROJECTION PARAMETERS:
Projection ALBERS Units METERS Datum HPGN Spheroid GRS1980 1st standard parallel 24 0 0.000 2nd standard parallel 31 30 0.000 Central meridian -84 0 0.000 Latitude of projection's origin 24 0 0.000 False easting (meters) 400000.00000 False northing (meters) 0.00000
DATA SOURCES CONTACT(S):
Name: Federal Communications Commission
Abbr.name: FCC
Address: 445 12th Street SW Washington, DC 20554
Phone: 1-888-225-5322
Web site: http://wireless.fcc.gov/geographic/
Email: fccinfo@fcc.gov
Contact Person: Melvin Del Rosario
Phone: 202/418-0615
Email: mdelrosa@fcc.gov
FGDL CONTACT:
Name: Florida Geographic Data Library
Abbr. Name: FGDL
Address: Florida Geographic Data Library
431 Architecture
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