Using old measurents or go and measure it again?

Following examples are calculated with BestNetwork.

Task
Calculate new coordinates for a boundary in a forest. It is not possible to use GNSS. The approach is to traverse with a total station. The yellow points are unknown. For these points new coordinates have to be calculated.

I have the choice of using old measurements or measure a new traverse. What is the difference in accuracy. What do I gain with new measurement? Here the picture of the two equipments. For both choice I set an accuracy of 10 mm for known points.

Traverse with new total station 2016

Parameters:
- distance 2 mm + 2ppm
- direction 0.5mgon
- centring error 1mm

Traverse with DK-RT 1930

Parameters:
- distance 10 mm + 100ppm
- direction 1.5mgon
- centring error 10mm

Result Traverse with new Total Station
- 8 mm

Result Traverse with DK-RT 1930
- 24 mm

24 mm is not bad. Consequently I us old measurements instead of going out into the forest and measure the traverse again. What would you do?

Measured by Hand: How Ropes Built the Ancient World
A World Measured by Hand and Rope
Picture this: you’re standing on the edge of an expansive Neolithic settlement, the air thick with dust, the rhythmic sounds of stone against stone echoing in the…

Knots and Numbers: How Prehistoric Societies Standardized Measurement
The Need for Standardized Measurement in a Prehistoric World
Before rulers etched in bronze or marble monuments marked with inscriptions, there were ropes—simple, flexible, and…

Lines in the Earth: Tracing the Archaeological Evidence of Rope-Based Measurement
The Challenge of Finding Ropes in the Archaeological Record
In the grand tapestry of human history, some threads fade with time, dissolving into the earth as if they…

You need to be a member of Land Surveyors United - Surveying Education Community to add thoughts!

Join Land Surveyors United - Surveying Education Community

Thoughts

Land Surveyor

J Keith Maxwell August 6, 2016 at 6:31pm

I wish I had found this sooner. I was tasked with re-surveying two golf courses, one that I'd surveyed 12 years ago. I decided not to re-survey the points, but only find the corners and flag them. I did check some with GPS. They were OK. I would have felt much better had I read your post then.

Thanks,

Keith

This reply was deleted.

Thoughts

Note: this page is for Futurist members who support the community and help us sustain financially.Please subscribe to unlock this page an almost 100 surveyor tools.

Note: this page is for Futurist members who support the community and help us sustain financially.Please subscribe to unlock this page an almost 100 surveyor tools.

Note: this page is for Futurist members who support the community and help us sustain financially.Please subscribe to unlock this page an almost 100 surveyor tools.

United States Surveyors

Asia Land Surveyor Forums

Africa Land Surveyor Forums

Middle Eastern Land Surveyor Forums

European Land Surveyors Forums

South American Land Surveyor Forums

Oceania Land Surveyors

Choose Your Equipment Type

Search Surveying Photos by Tag

Note: this page is for Futurist members who support the community and help us sustain financially.Please subscribe to unlock this page an almost 100 surveyor tools.

Note: this page is for Futurist members who support the community and help us sustain financially.Please subscribe to unlock this page an almost 100 surveyor tools.

Note: this page is for Futurist members who support the community and help us sustain financially.Please subscribe to unlock this page an almost 100 surveyor tools.