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GPS/GNSS Workflows

 

 

 

 

GNSS workflows involve coordinating the following three columns in the most efficient manner for each survey project.

Coordinate Reference System

Survey Type

GNSS Type

The table below lays out some of the relationships TPC helps you coordinate, so you can accomplish any workflow.

Coordinate Reference System

Survey Type

GNSS Type

Survey CRS = GNSS CRS

Data collection only

RTK via NTRIP

Use GNSS's CRS

Stakeout

RTK via Base / Rover / Radios

Use Survey's CRS

Corner search

PPK


A Simple Workflow

Data collection only for a survey that uses the same CRS as the GNSS.

You are asked to collect the monuments of record for a city project with 1 cm accuracy

The site has cell coverage and you are subscribed to an NTRIP network that provides NAD83(2011) positions

You can expect 1 cm accuracy at this location in your NTRIP network (distance to mount point, L1/L2, etc.)

All points are to be submitted as a shape file using their geodetic positions (latitude, longitude)

In the Office

1.Create a survey in NAD83(2011) in TPC and do all records research in that CRS

2.Export monument positions to GNSS

In the Field

1.In the field, collect data, do corner searches, etc. using RTK NTRIP corrections

Back in the Office

1.Export to TPC to review and qualify data (RMS, PDOP)

2.Export from TPC to ESRI Shape as geodetic positions

3.Review exported shapes in ESRI


A More Complex Workflow

You want to use GNSS to stakeout a foundation for an existing survey that is NOT on the GNSS CRS

You did the boundary/site/topo survey with a total station using 5000/5000 some time ago

You now have a CAD file of the plans at 0/0 and ground coordinates or a PDF of the plans

You choose to update your survey to the GNSS's CRS

The site has cell coverage and you are subscribed to an NTRIP network that provides NAD83(2011) positions

You can expect 1 cm accuracy at this location in your NTRIP network (distance to mount point, L1/L2, etc.)

In the Office

1.Calibrate the CAD file to your survey and insert it as an XRef into your boundary drawing or enter the dimensions from the PDF of the plans

2.Review and verify lot line offsets, easements, etc. Correct if needed.

In the field

1.Get GNSS positions on 2 or more survey control points (3 that encompass the project is adequate) using RTK NTRIP corrections

2.Export those positions to TPC running on a laptop accessing your hotspot used for RTK NTRIP, and calibrate the entire survey to the GNSS CRS

3.Export calibrated control and stakeout points to GNSS

4.Due GNSS corner search for at least 2 of the survey's calibrated control points to verify your calibration

5.Stakeout using RTK NTRIP corrections

6.Measure the staked points using RTK NTRIP corrections

Back in the Office

1.Imported the staked points and do a stakeout report to check residuals


Related Topics

Using GPS/GNSS

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