Javad TRIUMPH-LS, User Manual

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143
Localization
and Longitude, UTM, “My Job”, etc.
Multiple Point Localization (Unknown)
Multiple Point Localization To Multiple Points In
Unknown Coordinate System
Goal
To create a new coordinate system that provides the best-fit
to an existing grid system that is not related to a Geodetic
Reference Frame. This method would be useful for creating
a coordinate system for a total station survey that was
based on an arbitrary grid origin (such as N 5000, E 5000).
Once this localization is completed, it will be possible to
relate the total station survey coordinates to any other
Coordinate System as well as perform GNSS surveying in
the same coordinate system as the total station survey. The
underlying projection type for the resulting Coordinate
System is an Oblique Stereographic.
What you need
1. Local Grid Coordinates manually entered or imported
through ASCII. These coordinates should be from
an accurate survey. When entered into J-Field , these
coordinates should be entered into a Unknown System
as this grid system is technically “Unknown” until the
localization is completed.
2. Geodetic Coordinates (based on survey) of a sample
the Local Grid Coordinates. This sample of points
should be well distributed over the project area, have
an open view to the sky, and be within range of the base
station. While it is possible to collect these Geodetic
Coordinates with the base station determined from
autonomous positioning, it is highly recommended
that the base station be accurately related to a
Geodetic Reference Frame as this will allow maximum
utility of the coordinates determined in your survey.
To begin, Create a Project as previously described. Next,
coordinates for the Local grid system should be imported.
These coordinates can be manually entered or imported
through Data Exchange. For this example I am importing
these points through Data Exchange. NOTE: It is critical that
any coordinates imported into J-Field are imported into
Pages with the proper coordinate system and units set. For
more information regarding the importance of importing
with proper coordinate system set, see the Coordinate
System section of this manual (
p. 106
).
Regardless of how these coordinates are entered, it is
important to enter them into a Page with the Coordinate
System set to Unknown.