(a)

Based upon recommendations from the township engineer, the township board has determined that the North American Datum '83 World Coordinate System should be utilized in the township in the preparation of surveys in order to increase accuracy and, thus, avoid disputes and other problems which arise from error factors resulting from the preparation of surveys using the conventional system.

(b)

The township has established global positioning stations throughout the township.

(c)

It is the intent of this chapter to require utilization of the North American Datum '83 Geodetic Reference System with coordinate values based upon Michigan State Plane System (SPCS '83).

(Ord. No. C-336, § 1, 10-7-91)

[The following words, terms and phrases, when used in this chapter, shall have the meanings respectively ascribed to them in this section:]

G.P.S. shall mean the global positioning stations presently installed in the township.

SPCS '83 shall mean the Michigan State Plane Coordinate System based upon the NAD '83 Geodetic Reference System. The value of the "international foot" shall be used.

West Bloomfield Coordinates shall mean the coordinate values for most of the apparent and visible section and quarter corners on file in the office of the township engineer of the Charter Township of West Bloomfield.

(Ord. No. C-336, § 1, 10-7-91)

All surveys prepared for submission to the township for any purpose shall conform with the following requirements:

(1)

All surveys shall tie into and include coordinate values based upon Michigan SPCS-NAD '83 Coordinate System.

(2)

If available, both hard copy and computer disc compatible to the township system, shall be submitted.

(3)

At least two (2) of the permanent G.P.S. monuments shall be used in establishing a bearing and tying into the West Bloomfield Coordinates, and shall be shown as reference point monuments on the survey.

(4)

Several pairs (12) of monuments are available for direct bearing reference. If independent monuments are used, a bearing rotation shall be provided and traverse work submitted by a licensed professional land surveyor.

(5)

All bearings shall be based upon the West Bloomfield Coordinate System.

(6)

The section corner coordinate values on file in the office of the township engineer may be used to tie to township coordinates, provided they have been personally validated by a licensed professional land surveyor as the true corner by affidavit recorded at the office of Oakland County Register of Deeds, in accordance with Act 74 of the Public Acts of 1970.

(7)

Use of government corners not yet listed at the township shall be conditioned upon first establishing such corners by survey into the system with a minimum accuracy of one (1) in twenty thousand (20,000) using the established GPS network monuments only, and recording of an affidavit accordingly pursuant to Act 74 of the Public Acts of 1970.

(8)

If GPS receivers are used to establish new point and values for the township system, they shall be established using the two (2) original NGS stations on file at the township, and one (1) township GPS monument. GPS traverse closures shall be run. If values are acceptable, (at least one (1) in eighty thousand (80,000)), the points may then be accepted by the township if approved by the township engineer. Such establishment shall require a licensed professional land surveyor to install a permanent monument similar to existing township GPS monuments in conformance with specifications provided by the township engineer.

a.

Sea level factor and scale factor shall be applied to all values during surveys, so that all final values are on the NAD '83 Michigan State Plane Coordinate System ellipsoid.

b.

GF = SF × SLF

Earth's radius = 20,925,646 feet.

c.

A mean grid factor of 0.999877150 used in the original work for computations.

(Ord. No. C-336, § 1, 10-7-91)

(a)

Global positioning stations (GPS) installed by the township have been clearly marked, and shall not be disturbed, moved, removed, or otherwise modified on any circumstance.

(b)

In the event any person shall disrupt the precise position or location of any monument:

(1)

Such person shall immediately cause written notice to be provided to the township engineer.

(2)

The monument shall be properly reestablished pursuant to the directions, and under the supervision, of the township engineer.

(3)

All costs and expenses of such monument reestablishment shall be borne by the person responsible for the disruption.

(Ord. No. C-336, § 1, 10-7-91)