Updating Autonomous Start to an RTK Field Survey (Part II) Oscar R. Cantu
Topcon University FTP Site For access to previously offered webinars and supporting documentation, please go to: ftp://tulive+topconuniversity.com:tulive@ftp.topconuniversity.com
Scenario described Agenda Part I TopSURV Survey Configuration to support a Real Time Kinematic (RTK) field survey while also logging a static file Quick vocabulary review of Real Time Kinematic (RTK) field surveys Review of Field Sketch for project site and surrounding area Process description From the Field to the Office Start an RTK Survey from an Autonomous Position Collect Field Data with Rover Stop Static File within Base Receiver
In Topcon Tools office software: Agenda Part II Import static data from receiver Import TopSURV job from controller Submit static file to the National Geodetic Survey (NGS) Online User Positioning Service (OPUS) Receive and interpret NGS OPUS results Inverse of field measurements both before and after implementation of NGS OPUS Results View field data within Google Earth Update an Autonomous Start to an RTK Field Survey Update all Rover observations, inverse check
Go to Job / Import from Device to being process on downloading static file(s) from a GNSS receiver.
Check the Backup to Folder box and declare the path to where you want the static file within the GNSS receiver to be downloaded to. With an active connection made between your computer and the GNSS receiver, double click the Topcon Receivers icon,
Select the receiver that is connected to your computer to see all available static files within.
Select the receiver that is connected to your computer to see all available static files within. Click the Open button to begin downloading to the declared path. The static file will also be imported into your Topcon Tools job.
Done. The static file has been downloaded from receiver and onto your Personal Computer.
Their webpage address is: http://www.ngs.noaa.gov/
Updating Autonomous Start to an RTK Field Survey
Updating Autonomous Start to an RTK Field Survey
OPUS Derived Results
OPUS Derived Results Residuals Meters US Feet North 0.026 0.085 East 0.042 0.138 Height 0.017 0.056 Elevation 0.066 0.217
OPUS Derived Results The previous page offers the resulting precisions of the OPUS derived solution. Above are the coordinates that will be used to update the Autonomous Position that the mobile base receiver was initially started with.
Go to Job / Import from Device to being in your TopSURV job.
Recall that at this moment, the base and all rover observations are referencing the initial Autonomous quality start.
Gotta Confidence Builder? Stop. Recall that for this example, we have a field observation made with the rover receiver on a nearby published monument. This will serve as a confidence builder later. For now, and to have a before the fact comparison, let s find out how far it is between them. remember the Horizontal Distance of 5.611 feet and Delta Height of -2.614 feet that we saw earlier?
Within the COGO (Coordinate Geometry) pull down menu, select Inverse to find out the distance between two points.
Here we see the same Delta Elevation of -2.614 feet and Geodetic Distance of 5.611 feet that was in TopSURV keep moving.
Multiple Views within Topcon Tools Take advantage of the many ways to view your data within Topcon Tools and launch a real time Google Earth viewer.
To do so, simply go to View / Google Earth / CAD View and or Map View.
Note that we are viewing all rover positions with the base still referencing the initial Autonomous Position start. The points collected with the rover do not quite line up where the should visually within Google Earth. We will use this as a common sense check again as we proceed.
Updating Autonomous Start to an RTK Field Survey The first step to this process is to simply get things the same visually between your OPUS Result and Topcon Tools. For convenience, OPUS results are sent to you in several display options: State Plane Grid Coordinates, UTM Grid Coordinates, Latitude Longitude Ellipsoidal Height, Orthometric Height, etc However, all results are given in the distance units of Meters. Therefore, you will want to change display options within Topcon Tools to match the OPUS Result for an easy copy / paste.
Change display options to match OPUS Derived Results.
Right click the base point and select Properties to see it s position.
Updating Autonomous Start to an RTK Field Survey From here, it is as easy as a Copy / Paste. Update the Autonomous Quality position of the mobile base with the OPUS Derived Result.
Updating Autonomous Start to an RTK Field Survey As for the Elevation of your base point, this would be referred to as an Orthometric Height within the OPUS Result.
Updating Autonomous Start to an RTK Field Survey Once the Northing, Easting, and Elevation (Orthometric Height) have been updated, go to the General tab. Make sure to declare that this point now is of Both horizontal and vertical quality. When done, click the Apply and OK button.
Updating Autonomous Start to an RTK Field Survey Stop. At this moment, the only thing that has been accomplished is that the three dimensional position of the base point has been updated with an OPUS Derived Result. The rover observations have not been updated. To update all rover positions, it is essential that your updated base position is declared to be Both of horizontal and vertical quality (which it is for this example) and you must then Adjust.
Within the Process pull down menu, select Adjustment (F8).
All rover observations are now updated from OPUS Result.
Updating Autonomous Start to an RTK Field Survey Let s check our work. Recall that for this example, during data collection in the field with TopSURV, a rover observation was made to a nearby published monument with a National Geodetic Survey (NGS) Point Identifier of AH1683. Now all field work has been updated and adjusted from the OPUS Result, we should be a lot closer than before.
Within the COGO (Coordinate Geometry) pull down menu, select Inverse to find out the three dimensional distance between two points.
The intent is to find out how far it is between the adjusted field observation and the published values.
Done.
Updating an Autonomous Start to an RTK Field Survey with an OPUS Derived Result The results of our check are within the RMS values offered from our OPUS results and within RTK tolerances and they are no longer off the initial Autonomous Positional quality of 5.611 feet horizontally and -2.614 feet vertically. Good job!
Any questions?
Updating Autonomous Start to an RTK Field Survey (Part II)