The ACOD noise map
(page written by Robert Butera, PhD, PE)
PDK maintains 4 NMS (Noise Monitoring Stations) as part of its
Noise and Operations
Monitoring System. Data from PDK's
Noise Reports. Here is the map
with the NMS locations and measurements. A DNL is a weighted average
of the sound intensity at the monitoring station over 24 hours, with
a 10dB penalty for night flights.
|
|
NMS #1
|
NMS #2
|
NMS #3
|
NMS #4
|
|
ACOD Estimate
(see below)
|
74
|
59
|
64
|
61
|
|
All Year 2001
|
66.6
|
55.6
|
67.3
|
54.1
|
|
All Year 2002
|
66.5
|
54.9
|
59.9
|
63.5
|
|
All Year 2003
|
65.2
|
55.1
|
65.0
|
53.9
|
|
January 2004
|
64.1
|
56.1
|
59.8
|
52.8
|
|
February 2004
|
64.1
|
54.2
|
59.4
|
53.3
|
|
March 2004
|
66
|
60
|
60
|
55
|
|
April 2004
|
66
|
55
|
60
|
53
|
|
May 2004
|
65.5
|
63
|
63.3
|
62.7
|
|
June 2004
|
64
|
54
|
61
|
53
|
|
July 2004
|
64
|
54
|
58
|
53
|
|
August 2004
|
64
|
52
|
58
|
53
|
|
September 2004
|
65
|
60
|
60
|
58
|
Below is the airport noise zone map for Dekalb County's
proposed airport compatibility overlay district (ACOD). The location
of the NMS's have been added to the map. The four contours
(60,65,70,75) represent "estimated" DNL levels for the
purposes of classifying homeowner restrictions in the ACOD.
These measurements provide an assessment for asking the
question "how valid is the proposed ACOD map?" The ACOD
estimate column is an an estimate obtained by contour interpolation
of what the noise measurements should be if the ACOD map is
representative of current noise levels.
