SUBCOURSE EDITION - Modern Prepper

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Step 6: The intersections formed by the 1.590 centimeter arcs and grid lines are also connected witha light construction line as shown in figure 4-8. This line establishes the northing coordinate of theprojection corner.Figure 4-8. Connecting points (1.590 centimeters).Step 7: The intersection of the two light construction lines locates the exact position of the NWprojection corner as shown in figure 4-9. Mark this intersection with a very small pinprick and erase allconstruction lines and arcs used to locate the corner.Figure 4-9. Projection corner (projection line).74
Step 8: Next, proceed to the remaining projection corners and plot their corresponding locations.Always remember to plot the given measurements from the grid lines shown on Form 1941, and alwaysplot from these grid lines toward the grid corners.3. Plotting the graticule. Once the projection corners have been plotted, the next step is to locate andplot the graticule on the grid. As discussed earlier, the graticule is a network of lines which represent theparallels and meridians that form a map projection. It is the intersection of these parallels and meridiansthat you want to plot. Graticule ticks, which represent these intersections, must be plotted for all foursides of the projection, and for the interior crosses. In the following example, the north neat line will beused as an example to show how to plot the graticule ticks.Steps in plotting the graticule:Step 1:Determine the correct graticule interval for the desired scale.The minimum interval between graticule ticks is the first item to be determined. This intervaldepends solely upon the scale of your compilation base. As shown on DA Form 1941, the scale is1:50,000. By referring to (extract) TM 5-240, figure 4-7, the figure indicates that graticule ticks must beplotted every 5 minutes (5'00") as measured from the prime meridian.Step 2: Plot all graticule intersections using UTM grid coordinates provided on DA Form 1932.a. Determine the grid square in which the graticule intersection falls.b. Determine the measurement from the grid lines to the graticule intersection.c. Plot the graticule intersection using the dividers and invar scale.Figure 4-10 is the upper section of DA Form 1941. From the form you can determine that the northneat line has a geographic value of 38° 45' north latitude.Figure 4-10. Upper portion of DA Form 1941 (Virginia).75
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SUBCOURSEEDITIONEN5302 6US ARMY ENG
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PAGELESSON 5 - GEODETIC CONTROL....
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GRADING AND CERTIFICATION INSTRUCTI
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INSTRUCTIONAL CONTENT1. During your
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Figure 1-2. DA Form 1941 heading.b.
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d. Grid Size (fig 1-4). Now that yo
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c. When determining the number of g
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REVIEW EXERCISESNow that you have w
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Figure 1-5. Completed DA Form 1941.
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EXERCISE SOLUTIONS1. C, 125 (para 3
Page 22 and 23: INSTRUCTIONAL CONTENT1. Now that yo
Page 24 and 25: Step 3: Determine the approximate c
Page 26 and 27: Figure 2-5. Swing centerline arc.d.
Page 28 and 29: Divide the results by 2:of the grid
Page 30 and 31: Step 10: Construct the four corners
Page 32 and 33: a. Using the invar scale and beam c
Page 34 and 35: Step 14: Set the dividers or compas
Page 36 and 37: Figure 2-19. Grid labels.This compl
Page 38 and 39: 4. You have found the center of the
Page 40 and 41: LESSON EXERCISE RESPONSE SHEET1. __
Page 42 and 43: LESSON 3 - PROJECTION COMPUTATIONSO
Page 44 and 45: 44Figure 3-1. Completed DA Form 194
Page 46 and 47: (3) The equivalent UTM grid values
Page 48 and 49: Figure 3-4a. Southwest corner.Figur
Page 50 and 51: 50Figure 3-6. DA Form 1932.
Page 52 and 53: a. Heading (fig 3-7). The heading i
Page 54 and 55: 54Figure 3-9. Line showing 38° 30'
Page 56 and 57: (10) The graticule tick 38° 30'W l
Page 58 and 59: 58Figure 3-12. DA Form 1941 (Phoeni
Page 60 and 61: 60Figure 3-13. DA Form 1932 (Phoeni
Page 64 and 65: LESSON 4 - MAP PROJECTION CONSTRUCT
Page 66 and 67: 68Figure 4-1. DA Form 1941 (Virgini
Page 68 and 69: corner, you always plot the distanc
Page 70 and 71: Step 4: The intersections formed by
Page 74 and 75: Figure 4-11. DA Form 1932.Step 3: E
Page 76 and 77: Refer to the DA Form 1932 (fig 4-12
Page 78 and 79: Step 6: Graticule ticks are plotted
Page 80 and 81: The intersections formed by the 1.2
Page 82 and 83: Step 2: Drafting graticule ticks (f
Page 84 and 85: REVIEW EXERCISESNow that you have w
Page 86 and 87: Figure 4-22. DA Form 1941 (Ft. Belv
Page 88 and 89: Figure 4-23. DA Form 1932 (cont).91
Page 90 and 91: EXERCISE SOLUTIONS1. B, 0872 (para
Page 92 and 93: INSTRUCTIONAL CONTENT1. The term "c
Page 94 and 95: Figure 5-2. Heading information of
Page 96 and 97: Figure 5-5. Bottom of DA Form 1959
Page 98 and 99: 4. What are the centimeter plotting
Page 102 and 103: LESSON 6 - PLOTTING GEODETIC CONTRO
Page 104 and 105: 112Figure 6-1. Completed DA Form 19
Page 106 and 107: Step 3: Plot the easting value of t
Page 108 and 109: Step 7: Connect these two arcs with
Page 110 and 111: REVIEW EXERCISESNow that you have w
Page 112 and 113: Figure 6-10. Completed DA Form 1959
Page 116 and 117: Note: The following material is an
Page 118 and 119: d. Although Greenwich, England, is
Page 120 and 121: (3) Lambert Conformal Conic Project
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4-7. Identification of ControlIn or
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For example, if one end of the comp
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horizontal lines, and then repeated
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. To plot the geographic coordinate
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(1) First, determine the correct sp
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(5) Note that for each 5 minutes of
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4-13. Plotting Positions of Control
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5. What is the value of the first f
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PART II - CONSTRUCT MAP PROJECTIONR
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Requirement: Questions 16 through 2
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20. Refer to question 19. From whic
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154Figure 3. Completed DA Form 1959
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LEAVENWORTHU.S. GOVERNMENT PRINTING
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