SUBCOURSE EDITION - Modern Prepper

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horizontal lines, and then repeated, top and bottom, from the base line on the right, center, and leftvertical lines. Then 4 centimeters are set on the beam compass, and measured from the same origins.The procedure is continued for a 6 centimeter measurement, and so on until all four sides and the twocenterlines are divided. When the grid lines are drawn across the sheet, the pinpricks on the centerlinehelp to eliminate any tendency for the line to bow. Small pieces of acetate or other plastic taped overthe construction points protect them from damage by the points of the compass.(8) The last step in the construction of the grid is to ink the grid lines, if plotted on paper, orto engrave them, if on plastic. Figure 4-5 illustrates the step-by-step procedure for construction of a grid.Figure 4-5. Construction of grid and projection.135
. Plotting procedures are greatly facilitated when a coordinatograph is available. Thecoordinatograph; or rectangular coordinate plotter, is an instrument used to plot precise measurements.It is a table-like instrument containing a plotting arm across the surface for plotting x- and y-directions.The micrometer movement of the arm is geared along the glide-ends for precise adjustment and isequipped with needle, pencil, and inking points for plotting and drawing directly on the surface of themap or copy. The instrument is also equipped with interchangeable scales so that almost any desiredcombination of ratios can be obtained. In the preparation of maps, the coordinatograph is invaluable forthe construction of grid nets and the plotting of ground control.4-11. Plotting the Graticulea. Once the grid has been drawn, the next step is to locate the parallel and meridianintersections precisely according to the grid values of their geographic coordinates. Mapping instructionsin TPC TM S-1 specify the minimum interval be teen geographic coordinate intersections appearing onstandard maps. The intervals of plotted intersections required for standard scale maps are -Note: DOD Joint Operations Graphics (JOG) specifications are the basic instructions for 1:250,000 scalemaps, and specify: between latitudes 0° and 76° full lines of longitude shall be shown at 15-minuteintervals with 1-minute ticks shown thereon. Between latitude 76° to 84° North, and between 76° to 80°South, full lines of longitude shall be shown at 30-minute intervals with 1-minute ticks shown thereon.(1) It is usually sufficient to plot only the four corners of a 7 1/2-minute sheet at 1:25,000scale. The 15-minute sheets at 1:50,000 scale require that the intermediate 5-minute geographiccoordinate references be plotted to obtain the curvature of the parallels. A 30-minute sheet at 1:100,000scale requires that the 10-minute intersections be plotted.(2) When 2 1/2-minute ticks are desired between plotted 5-minute and 10-minute intervals,they are obtained by subdividing straight line connections between the plotted 5-minute and 10-minuteticks.136
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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
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INSTRUCTIONAL CONTENT1. Now that yo
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Step 3: Determine the approximate c
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Figure 2-5. Swing centerline arc.d.
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Divide the results by 2:of the grid
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Step 10: Construct the four corners
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a. Using the invar scale and beam c
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Step 14: Set the dividers or compas
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Figure 2-19. Grid labels.This compl
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4. You have found the center of the
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LESSON EXERCISE RESPONSE SHEET1. __
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LESSON 3 - PROJECTION COMPUTATIONSO
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44Figure 3-1. Completed DA Form 194
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(3) The equivalent UTM grid values
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Figure 3-4a. Southwest corner.Figur
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50Figure 3-6. DA Form 1932.
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a. Heading (fig 3-7). The heading i
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54Figure 3-9. Line showing 38° 30'
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(10) The graticule tick 38° 30'W l
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58Figure 3-12. DA Form 1941 (Phoeni
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60Figure 3-13. DA Form 1932 (Phoeni
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LESSON EXERCISE RESPONSE SHEET1. __
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LESSON 4 - MAP PROJECTION CONSTRUCT
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68Figure 4-1. DA Form 1941 (Virgini
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corner, you always plot the distanc
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Step 4: The intersections formed by
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Step 6: The intersections formed by
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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 100 and 101: LESSON EXERCISE RESPONSE SHEET1. __
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 114 and 115: LESSON EXERCISE RESPONSE SHEET1. __
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
Page 122 and 123: 4-7. Identification of ControlIn or
Page 124 and 125: For example, if one end of the comp
Page 128 and 129: . To plot the geographic coordinate
Page 130 and 131: (1) First, determine the correct sp
Page 132 and 133: (5) Note that for each 5 minutes of
Page 134 and 135: 4-13. Plotting Positions of Control
Page 136 and 137: 5. What is the value of the first f
Page 138 and 139: PART II - CONSTRUCT MAP PROJECTIONR
Page 140 and 141: Requirement: Questions 16 through 2
Page 142 and 143: 20. Refer to question 19. From whic
Page 144 and 145: 154Figure 3. Completed DA Form 1959
Page 146: LEAVENWORTHU.S. GOVERNMENT PRINTING
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