COGO tools in AutoCAD Map 3D

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When working in AutoCAD Map 3D,

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you can use Coordinate Geometry (COGO) tools to enter accurate geometry when creating map objects.

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For example, you can use information from legal documents or survey data to create precise parcel boundaries.

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In this exercise, you are creating a new parcel using distance and bearing information that was given to you.

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To begin, zoom in to the location of the new parcel.

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From the ribbon, Home tab, Draw panel, click the Line tool.

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When prompted for a point, use an object snap to specify the endpoint of the existing parcel line.

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Now, use a COGO command to draw a line from this endpoint in a specific direction.

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From the Home tab, Draw panel, expand the COGO drop-down and select Bearing Distance.

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First, you are prompted to enter the quadrant in which you are drawing.

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In this case, type 4, and then on your keyboard, press ENTER.

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Next, specify the angle. For this example, the angle is 21 degrees, 32 minutes, and 1 second,

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so type: 21d32'1"—where d is for degrees, the single quotation mark (') is for minutes, and the double quotation marks (") mean seconds.

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Press ENTER.

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Finally, you need to enter the distance.

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Move the crosshairs around, and you see that the line is locked into the bearing.

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At this point, you can either type the distance or pick it.

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Here, type the distance 235.4.

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Press ENTER to place the end point of the line.

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You want to draw the next line in a given direction, and you can do this using the Deflection Distance command.

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In this example, you want a line parallel to the existing line, so there is no need to find an exact bearing.

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You already know that you need a 90-degree angle.

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From the ribbon, Home Tab, Draw panel, click the COGO drop-down, and then select Deflection Distance.

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At the command line, you are prompted to enter a deflection angle.

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Enter 90 degrees, and then press ENTER.

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The line locks in at the specified angle, and again, you can either click to set the distance or enter one.

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Type 280, and then press ENTER.

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Now, simply go to the last point of the parcel using an object snap, and then press ENTER.

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This creates a new lot with COGO commands.

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All of these COGO commands

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—Angle Distance; Deflection Distance; Bearing Distance; Azimuth Distance; Bearing and Distance—

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work the same way.

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That is, you can use them transparently from within the AutoCAD Draw commands,

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and you can use any combination of standard AutoCAD tools along with these COGO specific tools, all within the same AutoCAD command.