Working with Determine Coord System
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28
Working with Determine Coord System
28.1
An Overview of the Program
Description
•
GPS measured points are always stored based on the global geocentric datum known as
WGS 1984. Most surveys require coordinates in a local grid system, for example, based
on a country’s official mapping datum or an arbitrary grid system used in a particular area
such as a construction site. To convert the WGS 1984 coordinates into local coordinates
a coordinate system needs to be created. Part of the coordinate system is the transfor-
mation used to convert coordinates from the WGS 1984 datum to the local datum.
•
The Determine Coordinate System application program allows:
• the parameters of a new transformation to be determined.
• the parameters of an existing transformation to be recomputed.
Transformations
A transformation is the process of converting coords from one geodetic datum to another.
Transformation requirements
• Transformation parameters.
• In some cases a local ellipsoid.
• In some cases a map projection.
• In some cases a geoid model.
Transformation parameters
A transformation consists of a number of shifts, rotations and scale factors, depending on
the type of transformation used. Not all of these parameters are always required. These
parameters may already be known, or may need to be computed.
Description of transformations
A Onestep transformation is provided on RX900.
Содержание GPS900 Series
Страница 1: ...Leica GPS900 Technical Reference Manual Version 1 0 English...
Страница 9: ...Table of Contents GPS900 9 Appendix E Cables 276 Index 278...
Страница 10: ...PART 1 The System GPS900 10 PART 1 The System...
Страница 106: ...Configuring the Radio Channel GPS900 106 Actual Freq The actual frequency of the radio Field Description of Field...
Страница 165: ...PART 2 The Applications GPS900 165 PART 2 The Applications...
Страница 275: ...Pin Assignments and Sockets GPS900 275 Sockets 8 pin LEMO 1 LEMO 1 8 pin LEMO HMI 1B 308 CLNP...