From Table B 4, it is noticed that Method 1 (where a WGS 84 site is established through

direct satellite observational data) gives the most accurate positional fix of 1 2 meters.

Method 4 (the least accurate) is entirely dependent on the local/regional distortion of the

local geodetic datum.

Table B 3.  Transformation Parameters Local Geodetic Systems to WGS 84

(For Complete Table   See Reference 4.)

Number of Doppler

Reference Ellipsoids and

Stations Used to

Local Geodetic

Parameter Differences**

Determine

Transformation

Systems*

Transformation

Parameters**

Parameters

Name

Da(m)

Df x 10

4

DX(m) DY(m) DZ(m)

PROVISIONAL SOUTH

International  251

 0.14192702

63

 288

175

 376

AMERICAN 1956

   Mean Value

  (Bolivia, Chile,

  Colombia, Ecuador,

  Guyana, Peru, and

  Venezuela)

PUERTO RICO

Clarke 1866  69.4

 0.3726439

11

11

72

 101

  Puerto Rico and

  Virgin Islands

QATAR NATIONAL

International  251

 0.14192702

3

 12

 283

22

  Qatar

QORNOQ

International  251

 0.14192702

  South Greenland

2

164

138

189

REUNION

International  251

 0.14192702

  Mascarene Island

1

94

 948

 1262

ROME 1940

International  251

 0.14192702

  Sardinia Island

1

 255

 65

9

 *Geoid heights computer using spherical harmonic expansion and WGS 894 EGM coefficient set

   (n=m=180), then referenced to the ellipsoid and orientation associated with each of the local

   geodetic systems

**WGS 84 minus local geodetic system

B 8