### Analyse Traverse example

Why is "traverse 3" a good solution and "traverse 1" not? What is the difference in accuracy and  reliability?

Following examples are calculated with BestNetwork.

Traverse is a method to establish control networks. Traverse networks involve placing survey stations along a line and then using the previously surveyed points with known coordinates as a base for observing the next point.

Traverse 3 explained:

- 2 new points with unknown coordinates are marked in red (points 4, 5).

- Existing points with known coordinates are marked in green (points 1, 2, 3, 6, 7 ,8).

- Station on point 1 with observations (orange lines) to point 2, 3 and 4

- Station on point 4 with observations to point 1 and 5

- Station on point 5 with observations to point 4 and 6

- Station on point 6 with observations to point 7,8 and 5

Traverse 1 explained:

- 2 new points with unknown coordinates are marked in red (points 4, 5).

- Existing points with known coordinates are marked in green (points 1, 2, 3).

- Station on point 1 with observations (orange lines) to point 2,3 and 4

- Station on point 4 with observations to point 1 and 5

Most critical point is number 5. Let's see the numerical result of traverse 1.

Accuracy (blue error ellipse in map):

Standard deviation in x is large. (notice that standard deviation of known points is set to 35mm)

Reliability (yellow line in map):

The report shows that the coordinates of point number 5 are not reliable. It is defined through the observation from station 4 and not controlled through any other measurements. A false observation from station 1 to target number 4 can cause an infinite wrong position of point 5 (999999 = infinite)

Add station 5 to traverse 1. What result can we expect whit this additional effort?

Traverse 2 explained:

- 2 new points with unknown coordinates are marked in red (points 4, 5).

- Green points are existing points with known coordinates (points 1, 2, 3, 6).

- Station on point 1 with observations (orange lines) to point 2, 3 and 4

- Station on point 4 with observations to point 1 and 5

- Station on point 5 with observations to point 4 and 6

Accuracy (blue error ellipse in map):

Standard deviation in x is quite good with 26 mm. (notice that standard deviation of known points is set to 35mm)

Reliability (yellow line in map):

The report shows that the coordinates of point number 5 are not reliable. A false observation (or in this case wrong angle) from station 5 to target number 6 can cause a  position error of 270 mm.

Finally see the result of traverse 3. It takes a bit more time to measure all 4 stations. Is this effort worth it?

Accuracy (blue error ellipse in map):

Standard deviation in x is good with 16 mm. (notice that standard deviation of known points is set to 35mm)

Reliability (yellow line in map):

The report shows that the coordinates of point number 5 are reliable. A false observation (or in this case false angle) from station 5 to target number 6 can cause a  position error of 93 mm.

Decide yourself!

- Traverse 1 is clearly a bad solution as the resulting coordinates of point 5 are not controlled in any way.

- Traverse 2 might be an option.There is some control and depending on the situation this may or may not be enough.

- Traverse 3 results are good in terms of accuracy and reliability of point 5 coordinates but it takes time to measure all 4 stations.

Check your own network design with BestNetwork.

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

### Latest in Surveyor Community

Land Surveyors United ✊ Global Surveying Community via Twitter
22 minutes ago
Bruno Bauteng, Gary Giordano and Meshack Malick joined Land Surveyors United - Global Surveying Community
Seeking Employment Land Surveyor Government Professional
49 minutes ago
Land Surveyor / Geomaticist - Barge Design Solutions - Nashville, TN via Land Surveying Jobs
Digest of the latest available Land Surveying Employment opportunities from Land Surveyors United…
5 hours ago
Land Surveyors United ✊ Global Surveying Community via Twitter
The latest episode of The @GEOholics Podcast is out! Never miss a podcast show by adding the #geoholics app to you… https://twitter.com/i/web/status/1484066436683341825
9 hours ago
Hays Property & Surveying: Surveyor / Senior Surveyor Valuation Advisory via Land Surveying Jobs
Digest of the latest available Land Surveying Employment opportunities from Land Surveyors United…
11 hours ago
Land Surveyors United ✊ Global Surveying Community via Twitter
How to convert SDR TO EXCEL OR SDR TO CSV https://ift.tt/3qEQGVP https://ift.tt/17wnhLZ
16 hours ago
Land Surveyors United ✊ Global Surveying Community via Twitter
RT @LandSurveyorsU: #Surveyors Don’t let your rod get crooked The #InvertBoot solves the age-old surveyor’s issue of recording the invert o…
16 hours ago
Land Surveyors United ✊ Global Surveying Community via Twitter
RT @surveyearth: #surveyinghistory 1935 San Antonio Land Surveyors #Texas https://landsurveyorsunited.com/hubs/texaslandsurveyors https://t.co/HdGOE3hcZG
16 hours ago

### Hey there! It looks like you are enjoying the community content.

That's nice! Please don't forget to mention us if you use what you just copied on your website. Help strenthen the community by linking back to us!

Thank you very much! Have a nice day! :)

Ok. Don't bother me again, for this session.