Towerkill Map Information
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Spacer The data used to chart the towers is derived from the Federal Aviation Administration's Digital Obstacle File. That file contains information on the locations and heights of communications towers and tower farms that may affect aviation safety - typically when a tower stands 200 feet above average ground level. The FAA tracks only the tallest tower within a tower farm, so dots on the maps may indicate more than one tower, but the height class of the structure(s) is accurate. The currency date for the map information is March 1998 and March 2004.
The FAA's digital obstacle file may be obtained by visiting the webpage:

We reiterate that the tower numbers on the website are not the actual number of towers within each political or geographic boundary. They indicate the number of towers and tower farms at least 200-ft high that the FAA is aware of. The actual number of towers is larger than the numbers indicated. The purpose of our rotating display of FAA towers and tower farms from 1998 and 2004 is simply to give the viewer a sense of the rapid buildout of such obstacles that is taking place in some regions of North America. Note that the information from regions outside the US is likely to be less accurate.

While just about any of the displayed towers on the maps kill birds every year, the number of birds killed will vary greatly depending on characteristics of the tower such as height, whether it is free-standing or supported by guy wires, the type of aviation obstruction lighting and whether there are other bright lights in the vicinity of the tower, and the geographic location of the tower with regard to bird movement patterns and weather conditions.

Paper maps illustrating the location of most of the towers tracked by the FAA are available from aviation stores at most airports. They are called Sectional Aviation Charts and can be purchased for about $10.00 per map. There are 37 such maps covering the lower 48 states.

The maps illustrating tower locations within each state were constructed by Karen Edelstein using ArcView software.