In the latest release version of J-Field, some exciting improvements have been made to the use of DPOS/VB-RTK and localizations.
In review, localizations in J-Field perform one of three operations:
Now, a user can perform a localization in the field based on an autonomous base position, later perform a DPOS/VB-RTK adjustment, and then select the Localize button on the Home screen and the localization is automatically recomputed from the new DPOS solution.
In review, localizations in J-Field perform one of three operations:
- Create Custom Projection to satisfy a set of grid coordinates to surveyed geodetic positions. An example of this might include using the Triumph-LS to survey several well-spaced points from a conventional survey in order to relate the RTK survey to the conventional survey or vice versa. In this context the geodetic relationship of the total station survey is Unknown. The rotation to geodetic North is unknown and the relationship of the grid origin (ie 5000,5000) to the Earth (ie Lat/Long) is unknown. The localization determines this relationship.
- Determine a transformation from surveyed points to a known geodetic system. An example of this might be that you set your base up with an autonomous position. You then proceed to tie into points with known coordinates in a known coordinate system, such as State Plane. You tie into one or more points and perform a localization that determines the rotation, scale and translation (N, E, U) from your autonomous base to the surveyed control. If your surveyed coordinate system matches your target coordinate system, there should generally be no rotation or scale (outside of very minor observational errors in the survey or in the control), only translation.
- Similar to No. 2 above, determine base translation for restarting the base. In this case all points using the autonomous base are adjusted by the translation parameters and the base point is translated as well. It should be noted, this requires the user to return to the base and restart it with the newly determined base position, so that the broadcast corrections being transmitted match the newly determined base position.
Now, a user can perform a localization in the field based on an autonomous base position, later perform a DPOS/VB-RTK adjustment, and then select the Localize button on the Home screen and the localization is automatically recomputed from the new DPOS solution.