surveying iii (topographic and geodetic surveys) - Modern Prepper

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(10) Enter the interval between the upper and middle threads and the interval between the middleand lower threads.(11) Enter the total interval between the upper and lower threads or the sum of the two halfintervals.(12) Record the rod number and temperature for the first backsight in each section. If it is foundthat the readings of the two thermometers differ, the number of each rod and its temperature should berecorded, with the reading for the backsight recorded first (specify Centigrade or Fahrenheit).(13) Record the foresight readings to the nearest 0.001 meter.(14) Enter the mean of the three thread readings for each foresight.(15) Enter the reading of the middle thread on the back of the rod to the nearest 0.01 foot.(16) Perform the procedures as for (10) above, but for the foresight readings.(17) Perform the procedures as for (11) above. This sum must not differ from the backsight sum(11) of any one instrument setup by more than 30 intervals (when using a level with a stadia constant of1/300) or by more than 33 intervals (when using a level with a stadia constant of 1/333). The 30-intervaland 33-interval figures are equivalent to 10 meters of distance (30 x 0.333 = 9.99 or 10 meters; 33 x0.300 = 9.9 or 10 meters).(18) Enter any other pertinent information in this column.(19) Enter the sum of the mean thread readings continuously for columns (8) and (14).(20) Enter the sum of the back of the rod readings continuously for columns (9) and (15).(21) Enter the sum of the intervals continuously down columns (11) and (17).(22) Enter the sum of all backsight readings.(23) Enter the sum of mean backsight readings.(24) Enter the sum of the back of rod backsight readings.(25) Enter the final sum of the backsight thread intervals.(26) Enter the sum of all foresight rod readings.EN0593 4-20
(27) Enter the difference between (22) and (26), and divide this difference by 3. In this case, thebacksight readings are larger; otherwise, the value in (22) would be carried over to the right-hand pageand subtracted from (26).(28) Enter the quotient. The quotient is a check against the difference of elevation obtained bysubtracting (29) from (23) and should agree within one or two millimeters.(29) Enter the sum of the mean foresight readings.(30) Enter the DE obtained by subtracting (29) from (23) with proper sign (backsight - foresight =DE).(31) Enter the sum of the back of the rod readings for the foresight rods.(32) Enter the difference in elevation in feet. Obtain this figure by subtracting (31) from (24) andmultiplying by 0.3048 to get the difference in meters. This value should agree approximately with theDE shown in (30).(33) Enter the final sum of the foresight thread intervals. This sum must not differ from thebacksight sum (25) by more than 20 meters (60 intervals for a level with a stadia constant of 1/300 and67 intervals for a level with a stadia constant of 1/333).(34) Enter the length of section in kilometers. This is the sum of (33) and (25) multiplied by thestadia constant of the instrument and divided by 1000.(35) Enter the final foresight. This reading was taken on benchmark 2.c. Instructions for Obstacle Crossings. When crossing a river, ravine, or other obstacle requiring aline of sight greater than 75 meters, make simultaneous reciprocal observations from each of two points,one on each side of the obstacle. Ensure that backsights and foresights are balanced, and establish aTBM near the edge of the obstacle. Establish another TBM on the far side of the obstacle, at about thesame elevation. Place rods, equipped with two targets each, on each of the TBMs. Place theinstruments, one on each side of the obstacle, where they can be directed on both rods and form a closedcircuitcrossing as shown in Figure 4-9, page 4-22.4-21 EN0593
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SUBCOURSEEN0593EDITIONAUNITED STATE
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TERMINAL LEARNING OBJECTIVE:ACTION:
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Part G: Adjusting Precise-Positioni
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PART A - FIGURES OF THE EARTH1-1. T
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Figure 1-2. Flattening Fractiona. T
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1-3. Geoid. In geodesy, precise com
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point in the survey to provide the
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one side of a triangle and all of t
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Figure 1-10. Simple Triangulation N
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observation, contains a light sourc
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of a horizontal rod with a small sp
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The Airy theory, announced by G. B.
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Figure 1-15. Products of the Gravim
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a. If the shape of the earth was ex
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Figure 1-16. Single Astronomic Stat
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Figure 1-17. Astro-Geodetic Deflect
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Figure 1-19. Astro-Geodetic Datum O
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(c) The significance of a gravity-o
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absolute deflections of the vertica
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Figure 1-23. Preferred Datumsa. The
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1-17. The World Geodetic System. Be
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Figure 1-25. Using the Same Referen
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LESSON 1PRACTICE EXERCISEThe follow
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12. Which of the following is assum
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LESSON 1PRACTICE EXERCISEANSWER KEY
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THIS PAGE IS INTENTIONALLY LEFT BLA
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for all military and civilian activ
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i. Additional support for other top
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2-7. Status. At present, topographi
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in both. (North American Datum of 1
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water can impede leveling operation
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A field recording booklet. A single
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PART I - OFFICE WORK2-24. General.
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PART J - SURVEY COMMUNICATION2-28.
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length or side is known, and all th
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second-order, Class I net. The leng
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The number of observations required
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to perform the reconnaissance. Fail
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and cultivated, or fields may have
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e an alphanumeric symbol that is st
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2-53. Intervisibility of Stations.
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station is (K/2) 2 x 0.0676, or one
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Figure 2-8. Similar Triangles Solut
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2-54. Height of Obstructions. It is
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authorized to change the name, it s
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Figure 2-12. Cells Connected in Par
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added as the cells weaken. Three un
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Figure 2-16. Construction Details f
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2-60. Wooden Towers. When it become
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11. The face of the 5-inch signal l
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average line in a triangulation sys
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3-4. Slope Measurements. The slope
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strip as close as possible to its f
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. Sight along the tops of both of t
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Column 1. Record the station number
Page 118 and 119: stake to steady it. With the back o
Page 120 and 121: Figure 3-3. DA Form 4446 (Sample of
Page 122 and 123: micrometer in this optical system i
Page 124 and 125: laterally across the front of the e
Page 126 and 127: Figure 3-7. Horizontal Circle and M
Page 128 and 129: out of adjustment. If the index mar
Page 130 and 131: (1) In order to avoid instrumental
Page 132 and 133: location of the vertical circle on
Page 134 and 135: Figure 3-13. Open Traversec. Closed
Page 136 and 137: designate the exact point of refere
Page 138 and 139: example, a line with an azimuth of
Page 140 and 141: When adjusting a traverse that star
Page 142 and 143: LESSON 3PRACTICE EXERCISEThe follow
Page 144 and 145: 11. The unit of graduation on a hor
Page 146 and 147: LESSON 3PRACTICE EXERCISEANSWER KEY
Page 148 and 149: THIS PAGE IS INTENTIONALLY LEFT BLA
Page 150 and 151: differential leveling. The theodoli
Page 152 and 153: additional runs are made due to exc
Page 154 and 155: Figure 4-2. Wild N-3 Precision Leve
Page 156 and 157: (8) Loosen the azimuth clamp (13),
Page 158 and 159: 4.7. Miscellaneous Equipment. In ad
Page 160 and 161: (2) To check for gross errors in th
Page 162 and 163: (a) (1) Begin by completing the inf
Page 164 and 165: Set up and level the instrument. Re
Page 166 and 167: Figure 4-8. Sun and Wind Code(5) Th
Page 170 and 171: Figure 4-9. Closed-Circuit River Cr
Page 172 and 173: Figure 4-11. Sample DA Form 5820 (R
Page 174 and 175: is 0. When the telescope is pointed
Page 176 and 177: stations. However, since all statio
Page 178 and 179: a. Complete the heading, as shown.b
Page 180 and 181: a. (1) Enter the date, as in the sa
Page 182 and 183: LESSON 4PRACTICE EXERCISEThe follow
Page 184 and 185: 11. The maximum length of site to o
Page 186 and 187: LESSON 4PRACTICE EXERCISEANSWER KEY
Page 188 and 189: PART A - GLOBAL POSITIONING SYSTEM
Page 190 and 191: 5-7. Pseudorange. A pseudorange is
Page 192 and 193: 5-15. Number of Pseudorange Observa
Page 194 and 195: i. Probable Error Measures. The acc
Page 196 and 197: Table 5-1. Representative GPS Error
Page 198 and 199: Table 5-2. Carrier Phase Trackinga.
Page 200 and 201: exercise extreme caution in applyin
Page 202 and 203: not be designed or performed to ach
Page 204 and 205: Table 5-3. GPS-S Design, Geometry,
Page 206 and 207: f. Multiple/Repeat Baseline Connect
Page 208 and 209: possible ionospheric and tropospher
Page 210 and 211: Figures 5-4. PDOP Versus Time PlotP
Page 212 and 213: e. Field Processing and Verificatio
Page 214 and 215: All carrier phase relative-surveyin
Page 216 and 217: time spent and the cost of conducti
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movement between occupation sites,
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5-37. General. GPS baseline solutio
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(1) Receiver Time. This technique u
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NOTE: Repeated baselines should be
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5-43. Loop Closure Checks. Postproc
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necessary to determine approximate
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This will ensure that future work w
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may (and usually does) far exceed t
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important in evaluating the overall
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i. Relative GPS baseline standard e
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12. When the networking method is s
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THIS PAGE IS INTENTIONALLY LEFT BLA
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FAR-77 obstructions. Aircraft-movem
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Figure 6-1. Imaginary SurfacesEN059
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Figure 6-3. Approach Surfacesa. Fed
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. Federal Aviation Regulation-77, S
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Table 6-4. Airport Obstruction Accu
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A horizontal scale of 1:12,000 and
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Figure 6-4. Sample DA Form 5821 (Ai
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Figure 6-5. Sample DA Form 5822 (PA
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