Unit 2 – Lesson 1: Create Survey Data Civil 3D 2010 Student Workbook ▪ 1 Create Survey Data Overview In this lesson, you learn how to use the survey functionality in AutoCAD Civil 3D. This functionality enables you to automatically create pre-engineering base plans and existing ground surface models directly from field survey data. When you use the Survey features, you can use total station and GPS observation data to automatically create pre-engineering base plans and existing ground surface models. You can also edit field data to adjust control coordinates, backsight angles, prism heights, and any other type of observed data. Surveyors produce information upon which a design can be based. This information is provided to site designers, and usually consists of a pre-engineering base plan, an existing ground surface model, and a reduced coordinate point file. Objectives After completing this lesson, you will be able to: Configure and identify the main components of the Civil 3D survey environment. Create a survey database and network. Create figure styles to control the display of figures. Create figure prefixes to assign figure styles to figures. Describe the main characteristics of the Autodesk field book file format. Import a field book file to Civil 3D. Lesson 1 AutoCAD Civil 3D 2010 Education Curriculum Student Workbook Unit 2: Create Ground DataUnit 2 – Lesson 1: Create Survey Data Civil 3D 2010 Student Workbook ▪ 2 Make changes to observation data in the survey database. Create points and figures from survey data. Exercises The following exercises are provided in a step-by-step format in this lesson: 1. Review the Survey Environment 2. Create Survey Database 3. Create a Survey Network 4. Create Figure Styles 5. Create Figure Prefixes 6. Import Survey Data 7. Edit Survey Data Survey Databases Survey information is the essential starting point for any land development project. Before the planning, feasibility, permitting, or design process can begin, a land survey of the project site must be conducted. This land survey represents existing conditions and shows the site's boundaries, topography, infrastructure, utilities, and other critical features. Raw data, or field observations such as horizontal angle, vertical angle, and slope distance, is collected using either total station or GPS data collection equipment. Field observation data is shown in the following illustration. Once collected, this data is stored in a central repository, the survey database. The data in the survey database can be accessed by any user and referenced to any coordinate system. SurveyUnit 2 – Lesson 1: Create Survey Data Civil 3D 2010 Student Workbook ▪ 3 databases are displayed on the Survey tab of Toolspace, and contain all the control points, known directions, observation measurements, traverse definitions, points, and figure data. The survey database can be created either locally, or on a network, and you import survey data collected from a number of sources. Survey observation data that resides in the survey database may be recreated in different drawings with different coordinate systems. This is especially useful when you need to produce drawings that represent grid coordinates, as well as drawings that represent ground coordinates from a common survey database. The survey database is intentionally kept separate and independent of your drawing project by Civil 3D for both practical and legal reasons. Original work done by registered surveyors is information that could have legal implications, and should not be altered without knowing the consequences. Survey databases are created as folders, by default, under C:\Civil 3D Projects.Unit 2 – Lesson 1: Create Survey Data Civil 3D 2010 Student Workbook ▪ 4 The survey data can be accessed through multiple drawings and can affect other objects, such as points and surfaces. For example, when you change a prism height or a backsight angle, associated point data automatically updates. Survey data is transformed according to the survey database coordinate system and the individual drawing coordinate system. If the drawing units and coordinate zone differ, then the survey is transformed. Survey Networks Survey networks are collections of survey control, instrument setup, and observation data, and are used to edit, organize and manage survey data. Survey networks are typically created for site analysis, boundary survey, boundary analysis, topographic survey, and as-built survey phases of land development projects. Survey networks can also be used to organize survey data geographically. The following illustration shows a survey network.Unit 2 – Lesson 1: Create Survey Data Civil 3D 2010 Student Workbook ▪ 5 Survey networks provide a repository for the data collected in land development projects. Each project phase, or location, can be represented by a network in the database. Once the network is created, survey data can be transferred to the database from total station and GPS data files. You can organize survey data by creating survey networks within the survey database for different stages of a land development project. Survey networks would be created for each of the following project phases: Boundary survey Topographic survey Each survey network is displayed in the survey database folder as a separate subfolder, and a survey database may contain several networks. You can import several survey data files, or raw data files, to a single survey network. Survey networks exist in the survey database and can be inserted to, and removed from, any drawing connected to the survey database. Survey networks contain the following data: Setups or stations Control points and non-control points Known directions Observations Traverses The following illustration shows a survey network created in the Survey tab of Toolspace.Unit 2 – Lesson 1: Create Survey Data Civil 3D 2010 Student Workbook ▪ 6 Figure Styles and Prefixes Many survey crews apply linework connectivity codes during their pre-engineering boundary and topographic surveys. Linework connectivity codes such as Begin, End, Continue, and C3 (to connect three points with an arc) result in the automatic creation of survey figures that represent ditch bottoms, road crowns, and sidewalk edges. The result is that the pre-engineering base plan and existing ground
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