This dataset contains the spatial extent of AM tower structures in the state of Florida. 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.
For research analysis to depict the location of AM structures in the State of Florida.
Point
publication date
None
431 Architecture PO Box 115706
Relied on the integrity of the attribute information within the original data layer.
Scale is an important factor in data usage. 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. 1:125000 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. These data are based on interpretation of available information and should not be construed as legally binding.
Relied on the integrity of the attribute information within the original data layer.
Relied on the integrity of the attribute information within the original data layer.
Spatial and attribute information
Data originally released by FCC in 2002. Data was downloaded by GeoPlan in shapefile format from the FCC website (http://wireless.fcc.gov/geographic/fcc_db.html) in 2002. When received, 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.
GeoPlan, during the QA/QC process included the following aspects: 1.) Reprojected data to FGDL Albers HPGN (See "Map Projection Parameters" below) 2.) Upcased all character records 3.) Changed original file name from "am" to "amtow" 4.) DESCRIPT item was added based on the item LICENSEE
Internal feature number.
ESRI
Data attribute inherent to the ESRI shapefile format, which defines the data as a point, polyline, or polygon.
FGDL
Callsign of facility or station (W = East of the Misssissippi)
FCC
AM station frequncy. AM stations occupy the frequencies of 540 kHz to 1700 kHz. These stations are allocated on a non-interference basis.
FCC
City location of "LICENSEE"
FCC
State location of "LICENSEE"
FCC
Company or organization that holds the legal license from the Federal Communications Commission.
FCC
Latitude coordinate of AM radio tower in "degrees, minutes, seconds"
FCC
Longitude coordinate of AM radio tower in "degrees, minutes, seconds"
FCC
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.
FCC
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.
FCC
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.
FCC
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.
FCC
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.
FCC
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)
FCC
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)
FCC
FGDL added item based on LICENSEE
FGDL
431 Architecture PO Box 115706
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