Working with Determine Coord System
189
Requirements to deter-
mine a transformation
•
To determine a transformation it is necessary to have common control points whose
positions are known in both WGS 1984 coordinates and local coordinates.
•
The more points that are common between datums the more accurately the transforma-
tion parameters can be calculated. Depending on the type of transformation used,
details about the map projection, the local ellipsoid and a local geoidal model may also
be needed.
Requirements for
control points
•
The control points used for the transformation should surround the area for which the
transformation is to be applied. It is not good practice to survey or convert coordinates
outside of the area covered by the control points as extrapolation errors may be intro-
duced.
•
When a geoid field file is used in the determination of a coordinate system, the control
points for the calculation must fall within the areas of the field files.
Summary of Contents for GPS900 Series
Page 1: ...Leica GPS900 Technical Reference Manual Version 1 0 English...
Page 9: ...Table of Contents GPS900 9 Appendix E Cables 276 Index 278...
Page 10: ...PART 1 The System GPS900 10 PART 1 The System...
Page 165: ...PART 2 The Applications GPS900 165 PART 2 The Applications...
Page 275: ...Pin Assignments and Sockets GPS900 275 Sockets 8 pin LEMO 1 LEMO 1 8 pin LEMO HMI 1B 308 CLNP...
