Geographic
Information Advisory Council
Kentucky State Plane Coordinate
System
The Kentucky Single Zone Coordinate System of 1983
The Kentucky Single Zone
Coordinate System as defined and officially adopted through the promulgation of 10
KAR 5:010
in August of 2001 was developed by the GIAC
Single Zone Subcommittee to address the increasing need for a mapping
projection that covers the entire state in a balanced manner than
extending the existing North
and South Zones beyond their originally intended ranges.
The Kentucky Single Zone
Coordinate System covers all counties in the Commonwealth and is defined by
the following parameters:
KENTUCKY SINGLE ZONE PARAMETERS
FIPS Code: 1600
Projection Scheme:
Lambert Conformal Conic
map projection with double standard parallels
Datum and Ellipsoid
North American Datum of
1983 (NAD83)
Geodetic Reference System
of 1980 (GRS80) Ellipsoid
Linear units of measure:
United States Survey Foot
as defined by:
One USFt equals 1200 /
3937 meter (0.304800610 meter), or
One meter equals 3937 /
1200 USFt (3.280833333 USFt)
Geographic Parameters:
North
Standard Parallel: 38
deg 40 min North Latitude
(in decimal
degrees): 38.6666666667
deg
South
Standard Parallel: 37
deg 05 min North Latitude
(in decimal
degrees): 37.0833333333
deg
Parallel
of Grid Origin:
36 deg 20 min North Latitude
(in decimal
degrees): 36.3333333333
deg
Meridian
of Grid Origin: 85
deg 45 min West Longitude
(in decimal
degrees): -85.75
deg
False
Northing:
1,000,000 meters
(3,280,833.33333 US Ft)
False
Easting:
1,500,000 meters
(4,921,250.00000 US Ft)
Note:
The Kentucky Single Zone is not defined on the NAD27 datum.
The Kentucky Coordinate
System of 1983 - NORTH AND SOUTH ZONES
The
Kentucky Coordinate System of 1983, as defined and adopted by KRS
1:020 was originally developed by the National
Geodetic Survey (formerly the United States Coast and Geodetic Survey) back
in the 1930’s as part of a national effort to provide land surveyors and
engineers with a means of representing projects in a common coordinate system
that covered very large areas of interest.
Under this system, Kentucky is divided into the North and South Zones.
The
state plane coordinate system in Kentucky was originally defined on the North
American Datum of 1927 utilizing the Clarke Ellipsoid of 1866 with the United
States Survey Foot (USFt) being the linear unit of measure, however, in 1986 the
NGS adopted the North American Datum of 1983, which is based on the Geodetic
Reference System of 1980 ellipsoid, with the meter being adopted as the standard
unit of linear measure.
In
the process of transitioning from NAD27 to NAD83, the NGS revised the parameters
defining the origin of the North and South zones so that obvious and discernibly
different coordinates for the same position would result between the two datums.
This strategy was adopted so that it would be possible to recognize the
basis of datum (NAD27 or NAD83) for a given set of coordinates when no other
information is given in addition to the coordinate values.
Given
that the North and South zones were defined on the NAD27 datum over a period of
several decades, there are mapping products and spatial datasets based on the
NAD27 state plane system still in use today.
It is therefore important that the basis of datum for state plane
coordinate values be ascertained any time they are encountered.
To eliminate the guesswork involved in identifying the basis of spatial
data, it is always desirable that the data be accompanied by information, or
metadata, explaining the exact basis of datum and the linear units of measure
being utilized.
NORTH AND SOUTH ZONE PARAMETERS – NAD83 DATUM
Projection
Scheme:
Lambert Conformal Conic
map projection with double standard parallels
Datum
and Ellipsoid
North American Datum of
1983 (NAD83)
Geodetic Reference System
of 1980 (GRS80) Ellipsoid
Linear
units of measure:
United States Survey Foot
as defined by:
One USFt equals 1200 /
3937 meter (0.304800610 USFt), or
One meter equals 3937 /
1200 USFt (3.280833333 USFt)
Geographic Parameters:
North Zone –
FIPS Code 1601
(in decimal
degrees): 38.9666666667
deg
South
Standard Parallel: 37
deg 58 min North Latitude
(in decimal
degrees): 37.
9666666667 deg
Parallel
of Grid Origin:
37 deg 30 min North Latitude
(in decimal
degrees): 37.5 deg
Meridian
of Grid Origin: 84
deg 15 min West Longitude
(in decimal
degrees): -84.25
deg
False
Northing:
0 meters
(0 US Ft)
False
Easting:
500,000 meters
(1,640,416.66667 US Ft)
Note:
The NAD27 North Zone is defined by the same above geometric parameters and
differs only in the False Northing and False Easting values.
They are as follows:
NAD27
North Zone False Northing:
0 US Ft
NAD27
North Zone False Easting:
2,000,000 US Ft
South Zone – FIPS Code 1602
North
Standard Parallel: 37
deg 56 min North Latitude
(in decimal
degrees): 37.9333333333
deg
South
Standard Parallel: 36
deg 44 min North Latitude
(in decimal
degrees): 36.7333333333
deg
Parallel
of Grid Origin: 36
deg 20 min North Latitude
(in decimal
degrees): 36.3333333333
deg
Meridian
of Grid Origin: 85
deg 45 min West Longitude
(in decimal
degrees): -85.75
deg
False
Northing:
500,000 meters
(1,640,416.66667 US Ft)
False
Easting:
500,000 meters
(1,640,416.66667 US Ft)
Note:
The NAD27 South Zone is defined by the same above geometric parameters
and differs only in the False Northing and False Easting values. They are as follows:
NAD27
South Zone False Northing:
0 US Ft
NAD27
South Zone False Easting:
2,000,000 US Ft