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Fall 2004 CIV.E 125/ENV. E. 100 43 Preparation of a Baseline Map CIV.E. 125 - Civil Engineering Concepts ENV.E. 100 - Environmental Engineering Concepts AutoCAD Tutorial #3 - Preparation of a Baseline Map Overview: The purpose of this tutorial package is to allow each student to begin construction of a map illustrating the surveyed details at the Columbia Lake site. The map will illustrate the location of your project baseline and the approximate location of the surveyed benchmark. Concepts: DDINSERT BLOCK MOVE DTEXT DDEDIT Instructor: Bob McKillop E2-2302 ext. 6372 1.0 Web Site Downloads Before you begin your next drawing, you need to access the course web site using your web browser once again. If you have been following instructions, you should have a subfolder called Survey_features on your personal disk space. If you don’t, create one with the following file structure: You will need a subfolder N:\ CIVE125 to hold your survey AutoCad_files drawings. Survey_features or N:\ ENVE100 AutoCad_files Survey_features In order to save you time, a series of AutoCAD drawings are provided for you on the course web site. These addition drawings provide the default symbols for your benchmarks, hubs, trees, etc. You will incorporate these drawings into your drawings by treating these drawings as blocks. In AutoCAD, blocks are a very powerful feature. More on blocks later…. Fall 2004 CIV.E 125/ENV. E. 100 44 Preparation of a Baseline Map The procedure for inserting these files into your drawings will be provided later in this tutorial. Download the following 1) hub.dwg files from the web site and 2) tree.dwg save them to your 3) bench.dwg Survey_features 4) elev.dwg subfolder 5) bm.dwg 6) xsect.dwg 7) interestpoint.dwg Exit your web browser and start up the AutoCAD program if you have not already done so. 2.0 Starting AutoCAD Begin this tutorial by loading your Location Map created previously. Re-name your drawing Using the “Save-As” command, save the AutoCAD drawing as “baseline_map.dwg” in the following folder: N:\ CIVE125 AutoCAD_files Survey_features/baseline_map.dwg or N:\ ENVE100 AutoCAD_files Survey_features/baseline_map.dwg 2.1 Fixing the Title Block Text Now is a convenient time to fix our title block. Several of the current title block text entries apply to our Location Map title block and are obviously incorrect for our Baseline Map. Turn off a drawing layer Use the LAYER command to turn off the layer called 2004_location_map_text. Change your title block Use the layer command to set the layer called 2004_border_text as the entries current layer. Using the DDEDIT command, change the following text items: 1) Date: to today’s date 2) Map Title to “Surveyed Baseline” 3) Drawing Number to 2004-02 4) Scale just leave this text blank for now. You will determine the best viewing scale for your specific survey at the end of the tutorial. Fall 2004 CIV.E 125/ENV. E. 100 45 Preparation of a Baseline Map Save your work. 3.0 Creating Your Baseline Map 3.1 Indicating Your Benchmark on your Map Now you can begin to work on your new drawing. We now need to zoom in on our drawing in the vicinity of the project benchmark and Hub #1. Work in model space Click on the Model tab at the bottom of your drawing to begin working in model space. Use the ZOOM command On the command line type z (for ZOOM) and press the <enter> key. to view your site. Press w (for Window) and press the <enter> key. You will be asked to specify the first corner of your new viewing window. Locate your mouse pointer near the location of your project benchmark and left click your mouse. Locate the other corner of your window and left click your mouse once again. Whenever you want to ZOOM back out, simply press z (for ZOOM) and e (for EXTENTS). Your drawing should appear similar to the following with your survey site located somewhere on the display. Fall 2004 CIV.E 125/ENV. E. 100 46 Preparation of a Baseline Map For this tutorial, we will adopt one of the benchmarks located near Columbia Lake and demonstrate how to locate a leg along a hypothetical traverse. Each group should examine the example presented in these notes but should work with their own actual survey data. Change the current layer Your drawing should contain 2 drawing layers called Civil_baseline and Civil_baseline_txt. Change the current layer to “Civil_baseline”. Locate your assigned On the command line, type DDINSERT to display an “insert” dialogue box. benchmark on your drawing. Click on the “Browse…” command button and open the file called “Bm.dwg” from your AutoCAD/Survey_features folder. Click on the Insertion point and Scale option buttons in order to have AutoCAD allow us to specify those parameters on screen one at a time. Do not click the Rotation buttons. Do not explode the drawing. Click the OK button. You will be prompted for 1) an insertion point. On your drawing, specify the (x,y) a number of items: coordinates of your benchmark and left click your mouse. The coordinates of all benchmarks are available on the course web site. 2) X scale factor Specify a value of 1 or 2. Adjust the scale factor to suit your individual drawing. 3) Y scale factor press <enter> to accept the default (the X scale) 4) Bench mark name type in your project benchmark number (i.e. BM-1) 5) Bench mark elevation type in the appropriate bench mark elevation (i.e. 334.814) Your drawing should now display your benchmark block drawing in the correct location. Fall 2004 CIV.E 125/ENV. E. 100 47 Preparation of a Baseline Map Following our hypothetical survey, a benchmark symbol should now be displayed on your drawing. 3.2 Locating Hub #1 on your Map We will now use another block called “Hub” to identify the stations defining the baseline of your survey. On the command line, type DDINSERT to display an “insert” dialogue box. Locate your assigned Hub #1 Click on the “Browse…” command button and select the file called “Hub.dwg” from your AutoCAD/Survey_features folder. Click on the Insertion point and Scale option buttons in order to have AutoCAD allow us to specify those parameters on screen one at a time. Do not click the Rotation buttons. Do not explode the drawing. Click the OK button. Fall 2004 CIV.E 125/ENV. E. 100 48 Preparation of a Baseline Map Again, you will be 1) an insertion point. Using the total station, Terry Ridgway prompted for a number of identified the AutoCAD coordinates for items: Hub #1 of your baseline. The coordinates of your Hub #1 are listed on the course web site. At the prompt, specify in the coordinates of your hub. Also enter the following information when prompted: 2) X scale factor Specify a value of 1 or 2 (adjust if necessary) 3) Y scale factor press <enter> to accept the default (the X scale) 4) Station elevation type in the appropriate hub elevation (i.e. 334.520) 5) Station name type in your first traverse station (i.e. Hub #1) Your drawing should now contain the inserted benchmark symbol and your specified elevation and hub identification similar to the example shown below. Fall 2004 CIV.E 125/ENV. E. 100 49 Preparation of a Baseline Map 3.3 Drawing the First Leg of your Baseline We will now draw the first leg of our hypothetical traverse as part of this tutorial. For the purposes of illustration, we will adopt a leg 25.55 metres in length, following a bearing of N6522’00”E. Each group should use their respective field data. Draw your first traverse On the command line, type LINE and press the <enter> key. leg You will be prompted with “From Point:” Type “int of” to indicate that you want AutoCAD to snap your line endpoint on the intersection of the lines that you indicate. Now, locate your cursor on the centre of Hub #1. Your screen display should provide a pickbox at the intersection of the two lines defining the Hub symbol. Left click your mouse. The command line will display “To point:”, prompting you for the other end of the line. In our case, the other end of the line is Hub #2. On the command line, following this tutorial example, enter the following: To point: @25.55<n65d22'00"E followed by pressing <enter> twice. Your drawing would now display the first leg of your traverse similar to the example shown below. Fall 2004 CIV.E 125/ENV. E. 100 50 Preparation of a Baseline Map Place Hub #2 on the end On the command line, type DDINSERT to display an “insert” dialogue box. of the line representing Click on the drop down arrow button and select the block called “hub”. Click Leg #1 of the baseline. the OK button. Do not explode the drawing. Again, you will be prompted for a number of items: 1) an insertion point. On the command line type “end of” to tell AutoCAD that you want to locate the Hub symbol at the end point of the line. On your drawing, locate your mouse pointer at the end of the line and left click your mouse. 2) X scale factor Specify a value of 1 or 2 3) Y scale factor press <enter> to accept the default (the X scale) 4) Station elevation type in the appropriate hub elevation (i.e. 334.998) 5) Station name type in your first traverse station (i.e. Hub #2). Your drawing would now look like the following: Fall 2004 CIV.E 125/ENV. E. 100 51 Preparation of a Baseline Map Change the current layer Using the LAYER command, change the current layer to “Civil_baseline_txt”. Enter any text identifying On the command line, invoke the DTEXT command. You will be prompted the traverse leg for the start point. On the command line, type “int of” and click on the centre of Hub #1. Specify a text height of 2 mm (or a size appropriate to your drawing) When prompted for the rotation angle, type “int of “ and click on the centre of Hub #2. When prompted for the text, type in the bearing of the leg. (Note: in AutoCAD, %%d displays the “degrees” () symbol). Text: type N65%%d22’00”E and press <enter> twice. The text will now be positioned on the line representing the leg. We need to move the text entity to a more desired position. Move the text string. On the command line, invoke the MOVE command. When prompted, select the text and move to a better location, centred between the hubs and off the traverse line, as shown below. Fall 2004 CIV.E 125/ENV. E. 100 52 Preparation of a Baseline Map Repeat the entire process to display the length of the leg (i.e. 25.55 m) beneath the line as shown below: 3.4 Completing the Construction of Your Baseline Save your work. Your hub symbols should be located on the civil_hub layer while your hub text entries should exist on the civil_hub_txt layer. Your traverse leg should be drawn on the civil_baseline layer and the baseline text (bearing and length of leg) should now be located on the civil_baseline_txt layer. Each project group should now be able to repeat the process outlined in Section 3.3 in order to draw the entire traverse (i.e. Hubs 3 and 4) defining the baseline of the field survey. 4.0 Examining Your Constructed Baseline On the command line type z (a shortcut for ZOOM) and press the <enter> key. Type e (a shortcut for EXTENTS) and press the <enter> key. If needed, use the Zoom (z) and Window (w) commands to zoom in on your baseline. Use the PAN command to adjust your screen display. Examine your baseline. If your baseline looks incorrect (i.e., one of your hubs is located in the middle of the lake!!) you need to re-examine your field book and spreadsheet calculations for errors. 5.0 Display at a suitable scale Finally, use the Zoom command to view your baseline map at a suitable plotting scale (i.e. 1:1000 or something similar). If you do not understand scaling, refer back to tutorial #2. Return to paper space and specify the scale in your title block. Print a hardcopy for your report. Save your work one last time.
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