11/30/2006 - 5:00 pm - 6:30 pm Room:San Polo - 3401 (ISD Campus)Traverses and AdjustmentsThis class looks at importing and adjusting traverses in Civil 3D 2007. We’ll work with open, closed, and multiple loop traverses. You’ll learn how to evaluate their data and correct problems.CV35-1LAbout the Speaker:Phil Zimmerman - IMAGINiT TechnologiesRicardo Rivera (Assistant); Lucy Kuhns (Assistant)andPhil is a technical author and instructor specializing in transportation, subdivision, and survey. His software expertise includes Land Desktop, Civil 3D, Map 3D, Survey, Raster Design. He has worked at survey and civil engineering offices, and instructed AutoCAD products in the Chicago and New England areas. Phil has an M.A. in Geography and is the author of Harnessing Land Desktop [email protected] Connect to AU all year at www.autodesk.com/AUOnlineTraverse and Adjustments 2 Civil 3D Survey The Survey toolspace panel contains tools that evaluate a survey’s observations and its traverses. The analysis data comes from imported field books or LandXML survey files. A traverse is a rigorous field data collection methodology. A traverse’s proscribed methodology defines the way a field crew observes traverse points. If the crew does not follow the methodology, they may break the traverse and not be able to analyze its data. Civil 3D Settings Civil 3D contains settings affecting survey components; the Settings panel, Survey User Settings, and an equipment database. The Edit Features Settings values assign default styles for survey networks and figures (see Figure 1). Figure 1 – Survey – Edit Feature Settings Survey Toolspace Civil 3D Survey is a tab on the Prospector/Settings toolspace. To add or remove the Survey toolspace, you select either Open or Close Survey toolspace from the Survey menu. The Survey panel of toolspace manages the Survey Databases and their data. If using Autodesk Vault, the survey toolspace is automatically created when defining a Civil 3D project. After creating a project, you must use the Vault Check-in and Check-out process. Civil 3D Vault Projects The process of creating a Civil 3D project, also creates a local survey database entry (see Figure 2). The survey is locked and even though you can open it, you have no access to it contents. To edit its contents, you must Check Out a project’s survey. After checking out a survey, you have full editing rights. This is indicated by the lock icon disappearing from the survey database name in the Survey toolspace.Traverse and Adjustments 3 Figure 2 – Survey not checked out Survey User Settings The initial settings for Survey are critical to correctly importing and adjusting field observations (see Figure 3). The settings list for User Settings is extensive and is called from the Survey toolspace by clicking on the Survey User Settings icon at the top of the Survey toolspace. The Survey User Settings affect the entire survey environment. The important sections assign values for traverses and Least Squares adjustments, handling of field book data, and figures. Figure 3 – Survey User Settings Dialog BoxTraverse and Adjustments 4 Equipment Settings The Equipment database section identifies the instrument used for a survey. The affect of this selection determines the error values for the survey’s observations. The equipment database can be stored locally or on a server. Equipment Databases Each instrument has its own observation characteristics; two of the same model may have slightly different measurement values (see Figure 4). For Civil 3D Survey an equipment profile records the errors within an instrument. The values of the equipment properties dialog box allow Survey to determine error amounts for field observations (angles and distances). Each instrument should have its own set of properties. Because each instrument can be slightly different, these differences must be made known to the adjustment routines when they evaluate survey observations. The settings include the units for data collection, types of angles, EDM and Prism indices, standard deviations for instrument errors, etc. Civil 3D’s Help identifies each value and describes what each value represents. If not creating a profile for each instrument, you should make one database entry that is generic enough to describe the errors for all of the instruments in use. Figure 4 – The Equipment Properties Dialog Box Import Defaults The Import defaults section of User Settings affects the importing and re-importing of field books (see Figure 3). When importing a field book, you must know whether the traverse is in one or more field books. Some traverse observations span two or more field books. When a single field book contains all of the observation of a traverse, the settings of the Import Defaults shown in Figure 3 are correct. If importing a second and any subsequent field books, you MUST toggle off Reset network and should toggle off Erase survey points from drawing. Figure Prefix Library The assignment of a Figure Prefix library, defines the names, styles, and functions of a figure (generic, parcel segments, or surface breaklines) (see Figure 5). The Figure Prefix database can be stored locally or on a server.Traverse and Adjustments 5 Figure 5 – Figure Prefix Database Assignment Figure Styles A survey figure style defines how a figure displays its information in a drawing (see Figure 6). The Information panel names the style. The Markers panel sets where markers appear on the figure and how they display in the drawing (their styles). The marker styles are from Marker styles of the Multipurpose branch of General in Settings. Figure 6 – The Marker Panel of a Figure StyleTraverse and Adjustments 6 The 3D Geometry panel affects the elevations of the figure in a drawing. A figure can use the 3-dimensional coordinates of the point that define the figure, exaggerate the figure’s elevation, or flatten the figure to a user specified elevation. The values of the Display panel control what components an object displays. Even though you may set every value in the style, the only components that display are those set to on in the panel. Importing Field Books with Figure Coding When importing a field book file with figure coding, Survey draws the figure linework and places it on a default figure layer or the layer defined by the figure prefix. If wanting each figure on a specific drawing layer, you should define a figure
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