This tutorial demonstrates how to analyze and reduce survey data.
In the following exercises, you will use the Survey Command Window to query survey data. Then, you will look at two ways to reduce the survey data.
You can reduce survey data by:
- Adjusting a traverse loop using the standard compass rule method or other adjustment methods.
- Using the network least squares adjustment method.
Each method produces slightly different results. The standard compass rule adjustment method adjusts the traverse loop and sideshots. The least squares method adjusts each of the observations so that the sum of the residuals is at a minimum.
Before performing the steps in this tutorial, you must have already created the survey database Survey 1 and imported the field book file Survey-1.fbk. For more information, see the Survey Setup and Importing and Viewing Survey Data tutorials.
For more information, see the AutoCAD Civil 3D Help topic Survey Analysis and Output.
Topics in this section
- Exercise 1: Querying Survey Data
In this exercise, you will use the Survey Command Window to perform a query on the survey data.
- Exercise 2: Performing Traverse Analysis
In this exercise, you will reduce some of the survey data using the traverse analysis Compass Rule adjustment method.
- Exercise 3: Performing Least Squares Analysis
In this exercise, you will reduce the survey information using the least squares adjustment method.
- Exercise 4: Translating a Survey Database
In this exercise, you will translate the contents of a survey database from assumed coordinates to that of known coordinates.