DGPS Surveying, Promark-3
Goodland Surveys Uses 4 unit of DGPS for fixing the ground control points. The instrument and the adopted methodology gives a perfect accuracy standard, as minimum as 1:25000. (The mentioned accuracy level is between DGPS and Conventional Total Station Traverse, not just between DGPS Observations).
We observe with 4 DGPS units, a base and three rovers (or) 2 base and 2 rovers as explained the picture below.
Survey in Static Mode, observation for 50 minutes or more time span according to site + satellite position and post processing are required. GNSS Solutions is a software for downloading the data and Processing the data. While processing the data to be checked for a triangle closure, data masking and other errors. If the processing results are up to the standards then the network to be adjusted and results will be given.
Between the DGPS points, with a quality total station to be used for traversing. 5" accuracy or better angular accuracy machine is essential with Tribratch+adapter+prism units for Change Points and Back side points. While traverse, the angular measurements (Included Angle) and Distance to be recorded. While calculating, the angular error (Bearing) to be distributed first then the accuracy level to be calculated.
If the accuracy level is up to the standard, then the error to be distributed and final values can be used.
A sample calculation sheet showing the traverse accuracy
Goodland Surveys Uses 4 unit of DGPS for fixing the ground control points. The instrument and the adopted methodology gives a perfect accuracy standard, as minimum as 1:25000. (The mentioned accuracy level is between DGPS and Conventional Total Station Traverse, not just between DGPS Observations).
We observe with 4 DGPS units, a base and three rovers (or) 2 base and 2 rovers as explained the picture below.
Survey in Static Mode, observation for 50 minutes or more time span according to site + satellite position and post processing are required. GNSS Solutions is a software for downloading the data and Processing the data. While processing the data to be checked for a triangle closure, data masking and other errors. If the processing results are up to the standards then the network to be adjusted and results will be given.
Between the DGPS points, with a quality total station to be used for traversing. 5" accuracy or better angular accuracy machine is essential with Tribratch+adapter+prism units for Change Points and Back side points. While traverse, the angular measurements (Included Angle) and Distance to be recorded. While calculating, the angular error (Bearing) to be distributed first then the accuracy level to be calculated.
If the accuracy level is up to the standard, then the error to be distributed and final values can be used.
A sample calculation sheet showing the traverse accuracy
