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Coordinate System of Ardmore's G.I.S.
Sub-Meter G.P.S. Units
*NAD 1983 State Plane Oklahoma South, Feet FIPS 3502       *Lambert_Conformal_Conic
*Name: GCS_North_American_1983
*Angular Unit: Degree (0.017453292519943295)
*Prime Meridian: Greenwich (0.000000000000000000)
*Datum: D_North_American_1983
   Spheroid: GRS_1980
    Semimajor Axis: 6378137.000000000000000000
    Semiminor Axis: 6356752.314140356100000000
    Inverse Flattening: 298.257222101000020000
1998 Color Orthophotography Vector Data Accuracy
*Date of Photography : February 7, 1998
*Time of Photography : Between 10:00 a.m. & 2:00 p.m.
*Flight Altitude : 4950'
*Camera Used : RC-30
*Focal Length of Camera : 6"
*Scale of Original Photos : 1:9900 or 1"= 825'
*Photography by : Land Data Geo Services, Inc.
*Digital Format : Tiff & Sid with world files
*Sub-meter accuracy on data compiled from orthophotography & G.P.S.

*Engineering accuracy from data extracted from digital plats & plans in the correct coordinate system.
Useful Conversions & Information



1chain
1 chain
1 rod
1 mile
1 mile
1 mile
 1 sq. mi.
1 acre
1 acre
1 meter
1 meter
1 inch


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100 links
66 feet
16.5 feet
80 chains
320 rods
5,280 feet
 640 acres
43,560 sq. ft.
208.71 ft. sq.
39.37 inches
3.28 feet
2.54 centimeters
 Methods of Measuring Angles
Azimuths
 Bearings


Measured from 0º to 360º
Requires only numerical value
Measured clockwise only
 Measured from 0º to 90º
Requires two letters & numerical value
Measured clockwise & counter clockwise

Sections, Townships, & Ranges
An Ideal Township
 An Ideal Section




           
The "Ideal" township is a 6 mile by 6 mile quadrangle that contains 36 square miles & allows the land to be divided in a rectangular method.  This method utilizes a principal meridian & baseline to originate from. Townships are numberd north & south from the baseline. They are also measured east & west with respect to the principal meridian by range numbers. The north & west lots of each township are designated to compensate for discrepancies that may occur in that township.
 The "Ideal" section is one square mile containing 640 acres.  It is 5,280 feet by 5,280 feet & is divided up by quarter sections. A section can be divided several times by repeating variations & combinations of this method.



                                                                                                    
©Copyright 2004, City of Ardmore, G.I.S. Dept.
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