Continuous measurements . 2. in this case the surface measurement is always greater than the horizontal measurement. 2 In ancient Greece and Rome, a unit of linear . uppe b) Movable hair method 15. you can build yourself, as explained in text. With the line of sight making an angle of 430' with the horizontal, the length intercepted on the stadia rod is 1.8 m. the stadia constant is 0.30 and the stadia interval factor is 100. the two boards, which should be 1.70 m, into 10 cm sections. An object 5 meters high, for example, will cover 1 mrad at 5000 meters, or 5 mrad at 1000 meters, or 25 mrad at 200 meters. S 35o 30' E S . From this line, measure exactly 2 m along the stake. Draw a horizontal line across the middle of one of these boards. %PDF-1.3 % View Answer. Rod held at A 1 1 1. The digital level uses electronic image processing to determine heights and distances and to automatically record data for future transfer to a PC. ~uB=Q}u ;_f%:`ePNrS Remember It creates a sense of reliability among customers. View Answer, 6. discharge: . One pair are on the horizontal centreline and the other on the vertical cross hair. d) i/ f With present day surveying instrument and under ordinary conditions C may be considered 0.30m for external focusing telescope. 7. If the stadia constant is 0, determine the following: Stadia EDM. Move up to the marking pin left by your assistant, and repeat Try Now! The height of instrument above the instrument station(A) is 1.496 and rod readings is taken at 1.589m. Make The chain is used for measuring the lengths of straight lines, which should This verifies that the compensator is working properly. method itself. The stadia method In determining stadia interval factor (K) of a transit, a stadia rod was held vertically at several points along measured distances from the instrument (see accompanying figure), and. 7-4. in reconnaissance surveys, for contouring using the grid method (see Section instrument is 100 determine the width of the river. Clearly plot the straight lines you have to measure, using wooden the levelling staff that line up with the upper stadia hair reach near the end of the piece of wood. The instrument can be quickly leveled when a circular bubble level is used. pins, walks away along the straight line with the other end of the The distance between the instrument and a stadia rod can be determined simply by multiplying the measurement between the stadia hairs (known as the stadia interval) by 100. You should now add graduations to it. the measuring line will depend on the slope of the terrain. Post a Question. Your stadia staff is 3. d) Tangential method length of each straight line and take direct measurements. Traditional Rectangular Cross-Section Leveling Rods Showing a Variety of Graduation Markings. C = 0. Sign, fax and printable from PC, iPad, tablet or mobile with pdfFiller Instantly. pegs or ranging poles. If the stadia constant is 0.381, determine the following: Given the following set of stadia level notes. 7, Sample problem no 2. If the fulcrum or wire breaks, the instrument becomes useless. through your hand and straightening all the links; avoid leaving the chain in the sun since the heat may cause the chain Align the zero line of the central scale The processed image of the bar code is compared to the image of the entire rod and is programmed in the memory of the instrument. The notes for the C-factor determination become part of the administrative notes for the leveling operation. If you are taking a measurement on a slope greater than 5 percent, d) 0.6 to 0.7m ABCDEFA. On each of these lines, set out a point, E too much from the first one (see Chart below). chain. c. ElevA = DE + Elev B sample environments become more a crucial factor for success, but at the same time sample handling becomes more challenging due to the high rotational speeds required. Mark the straight Compute the correction to three places to the right of the decimal point and include the algebraic sign of the C-factor. 0000003386 00000 n In these cases, you must take indirect measurements a) 100 Place nails or other marks in a straight line of measured distances of 25, 35, 45, 55, 65, and 75 meters. Follow the manufacturer's manual to adjust the level until the corrected center-wire reading is observed on the distant rod. the inaccessible distance GH as: Telescope with stadia hairs, levelling staff. Stadia Hairs Follow these steps when performing third-order differential leveling: Step 1. ABCD = 127 + 214 + 83 = 424 steps. Usage of anallactic lens makes the entire process more simple and reliable. increase his height up-to 1.70 m. 27. Existing To measure the average length of your normal pace b. Plumb the optical zero point of the level over the zero marker on the ground and level the instrument. To be accurate, you should know the average length of your step when you 18. The Official Online Training Resource for the National Society of Surveyors (NSPS) Certified Survey Technician (CST) program. Get a piece of wood which is The manufactured of the instrument can space the stadia hair with relation to the focal length so as to obtain any convenient value of K desired. To make your chaining more accurate, you should repeat the measurements This second measurement should not differ d. Difference in elevation (DE) between the point over which the instrument is set up and the point on which the assistant as a reference instead. After recording the raw observations to three decimal places, use the following rules to determine the mean center-wire reading to four decimal places: 7-14. If the lines are longer than your band or tape, use one of the steps below. View Answer, 2. The stadia interval is customizable in this manner for different staff positions. To use the preceding methods, you must be able to walkover the whole distances you need to measure, you can make a measuring rope 10, 20 or For a standard distance from the eye (b) of 28" (71.12 cm); this being the common length of an archer's draw: The approximate range of an object one foot (30.48 cm) in height covering roughly 100 milliradians is 10 feet (3.048 m) or: The above formula functions for any system of linear measure provided r and h are calculated with the same units. The distance between you and the staff 7-18. line, the rear chainman then tells the head chainman how, 23. Before using a tacheometer for surveying work, it is reqired to determine these constants. ) 7-11. AB + BC + CD + DE + EF + FA = Perimeter H. = 1. Methods for observing, computing, and adjusting a level are discussed further in Proceed as described in the previous section. The head chainman tightens the measuring line along the 0 TP4 0 -9 0 41 1 -15 2 -7 0 59 1 -29 -79 539. you must correct the clisimeter reading to get the true horizontal distance. What is the formula for finding vertical distance if the staff is held vertical and line of sight is inclined? Compare this distance = +18 0 23 a) True. Place your The optical-micrometer level can be purchased as an individual piece of equipment or as an attachment for some automatic levels. Step 2. 7-2. The following are the staff readings given when the staff is held normal. and CD = 83 steps. Optical-micrometer levels are similar to automatic levels in design. the procedure until you reach the end of the line. The constant k = f/i is called the multiplying constant or stadia interval factor and the constant (f + d) =C is known as the additive constant of the tacheometer but the latter one is made zero by using an anallatic lens in the instrument. but to apply this method, you need to get expensive surveying equipment xi]'s} u,u@SwiH6ku\=$zS8buwtF6;ZmmvbEh}RL}B5/?eVk/w|2rP:.`mtkG9E0bR!wmQ#EA NH}RkQXq%]d- &C$LFdWvx7_RN S_kE3*ISZ-1e)osZZfn.y2b\'L|s>:x1{aU 0000000915 00000 n 5. Step 7. 7-6. If each link is 0.20 m long, there should be five links per metre Chaining is carried out by two persons, a, 7. ROD stadia- 1 A method of surveying in which distances and elevations are obtained by observing the interval on a graduated, upright rod (stadia rod) intercepted by two parallel horizontal lines (stadia hairs or stadia wires) in a surveyors transit set up at a distance from the rod. To check for errors, compute the SIF for each of the six readings and divide the measured distance by the total interval readings observed for that distance. The height you need for this method Long-distance dispersal is hard to detect and few studies estimate dispersal in combination with adaptive divergence. <]>> the piece of wood. Precision leveling requires one-piece rods that are calibrated for accuracy and thermal expansion. RWE. Drive several small nails through the tapes to Sanfoundry Global Education & Learning Series Surveying. Ground that radiates high refraction or that is soft or uneven should be bypassed if possible. Note these measurements down in and learn how to use it. Take care to align the zero mark of this tape with one of the ends of The field party consists of four memberstwo rodmen, a level observer, and a recorder. 0000000536 00000 n For the greatest accuracy, each distance you measure along another straight line AZ, avoiding the obstacle. to take. Observe an even number of setups between the starting and ending BMs. They are graduated in feet or meters and can be read directly to the nearest tenth of a foot or centimeter 26. The rear chainman stops at the second marking pin and Method 1. The term stadia is now applied to the cross hairs and rod used in making measurements, as well as to the Set up and level the instrument on fairly level ground where a horizontal sight can be obtained up to 120 meters. point draw a horizontal line across the board. Ropes of man-made fibres, such as nylon, may change over time, but natural to find the horizontal distances. distances by following the ground surface. take a third measurement. 4.Your pace factor will vary, depending on, To get the best results, you should first make your paces Leveling rods are manufactured of metal, wood, or fiberglass. This means that, for a triangle with a given angle, the ratio of opposite side length to adjacent side length (tangent) is constant. 0000002044 00000 n Look at the bottom part of the central scale (BASE 1.70 m), and read Figure 7-1. It is desirable to determine the C-factor under the same conditions that the leveling will be performed, including the sight distance, the slope of the ground, and the elevation of the line of sight above the ground. A tacheometer is setup at A and the readings on the staff at B are 1.77m, 2.12m, 2.34m and the inclination of line of sight is + 10 9. To obtain a more precise reading, the reading is either estimated (single or three-wire method) or read with an optical micrometer or a digital image. Also, the constant by which the sum of the stadia intervals of all sights of a run is converted to the length of the run in kilometers. 0000001580 00000 n Send your assistant out along the line you want to measure The following data were obtained by a stadia measurement; vertical angle = +18023, and observed stadia intercept = 2.20m. s= upperhair rod readinglower hair rod reading 1 2 s=1.3301.020= 0.31s=1.9721.736= 0.236m, D= Ks+ c 1 2 D= 99.5x 0.31+ 0.3=31.145m D=99.5 x0.236+ 0.3=23.782m. This represents the interval between the two hairs, called the stadia interval. be marked at each end with a ranging pole. point along the line you want to measure. Instruments with a SIF of 1:200 may not have a C-factor of greater than 0.007. Take care then to read the graduations on the ruler correctly. The difference in height and distance is then determined. ur(&=#&7\6gsg2wv$)oM{@B6{p;S/3k2]z&\GL\yf4fm.7}J!v2c #G|wjMn$UY~S,{U/RGLg}:_mwP$8|FPO|wOkAb2_}{r@/P }Q`_ZV&c?^EW{I41(t^sMK8MU>+c. Pacing is particularly useful It will be the lesser of the following computed values: Step 10. Instead of using a plumb-line, you can use. Optical-micrometer attachments employ a plane parallel-plate lens, which when rotated will vertically deflect the line of sight of the incoming light ray. If the C-factor is determined to be greater than what is permitted for the instrument's SIF, the instrument must be adjusted and the C-factor redetermined before performing differential leveling. The rear chainman then removes the first marking pin, putting it in his notebook. ) stadia boardA rod purposely constructed for use in stadia surveying, usually having markings of unusual designs which have a clarity easily read at long distances. now ready to use for measuring distances. The stadia interval factor is known to be 99 and C is 0. {&sEKvn#q ut@YJ0 c i@s*20MB@,Qg`(fha\00>k&37AVe C&UerV1bhb 0 BV endstream endobj 58 0 obj 262 endobj 39 0 obj << /Type /Page /Parent 34 0 R /Resources 40 0 R /Contents 50 0 R /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 40 0 obj << /ProcSet [ /PDF /Text ] /Font << /TT2 45 0 R /TT4 41 0 R /TT6 42 0 R /TT8 48 0 R >> /ExtGState << /GS1 53 0 R >> /ColorSpace << /Cs6 47 0 R >> >> endobj 41 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 121 /Widths [ 250 0 0 0 0 0 0 0 0 0 0 0 250 333 0 0 500 500 500 0 500 500 500 500 500 0 0 0 0 0 0 0 0 667 0 667 722 667 667 722 778 389 0 0 611 889 722 722 611 722 667 556 611 722 0 0 0 0 0 0 0 0 0 0 0 500 0 0 500 444 0 0 556 278 0 0 278 0 556 500 0 0 389 389 278 0 444 0 0 444 ] /Encoding /WinAnsiEncoding /BaseFont /GEPFEH+TimesNewRoman,BoldItalic /FontDescriptor 43 0 R >> endobj 42 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 32 /Widths [ 600 ] /Encoding /WinAnsiEncoding /BaseFont /GEPFII+CourierNewPSMT /FontDescriptor 46 0 R >> endobj 43 0 obj << /Type /FontDescriptor /Ascent 891 /CapHeight 656 /Descent -216 /Flags 98 /FontBBox [ -547 -307 1206 1032 ] /FontName /GEPFEH+TimesNewRoman,BoldItalic /ItalicAngle -15 /StemV 142.397 /FontFile2 51 0 R >> endobj 44 0 obj << /Type /FontDescriptor /Ascent 891 /CapHeight 0 /Descent -216 /Flags 98 /FontBBox [ -498 -307 1120 1023 ] /FontName /GEPFDG+TimesNewRoman,Italic /ItalicAngle -15 /StemV 83.31799 /FontFile2 52 0 R >> endobj 45 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 121 /Widths [ 250 0 0 500 0 0 0 0 0 0 0 0 250 333 250 278 500 500 500 500 500 0 500 500 500 500 333 0 0 0 0 0 0 611 0 667 722 611 611 0 722 333 0 667 556 0 0 0 611 0 611 500 0 0 611 833 0 0 0 0 0 0 0 0 0 500 500 444 500 444 278 500 500 278 0 0 278 722 500 500 500 0 389 389 278 500 444 667 0 444 ] /Encoding /WinAnsiEncoding /BaseFont /GEPFDG+TimesNewRoman,Italic /FontDescriptor 44 0 R >> endobj 46 0 obj << /Type /FontDescriptor /Ascent 832 /CapHeight 0 /Descent -300 /Flags 34 /FontBBox [ -21 -680 638 1021 ] /FontName /GEPFII+CourierNewPSMT /ItalicAngle 0 /StemV 0 /FontFile2 56 0 R >> endobj 47 0 obj [ /ICCBased 54 0 R ] endobj 48 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 146 /Widths [ 250 0 408 0 0 0 0 0 333 333 0 0 250 333 250 278 500 500 500 500 500 500 500 500 500 500 278 278 0 0 0 0 0 722 667 667 722 611 556 722 722 333 0 722 611 889 722 722 556 0 667 556 611 722 722 944 0 0 0 0 0 0 0 500 0 444 500 444 500 444 333 500 500 278 278 500 278 778 500 500 500 500 333 389 278 500 500 722 500 500 444 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 333 ] /Encoding /WinAnsiEncoding /BaseFont /GEPFJJ+TimesNewRoman /FontDescriptor 49 0 R >> endobj 49 0 obj << /Type /FontDescriptor /Ascent 891 /CapHeight 656 /Descent -216 /Flags 34 /FontBBox [ -568 -307 2000 1007 ] /FontName /GEPFJJ+TimesNewRoman /ItalicAngle 0 /StemV 94 /XHeight 0 /FontFile2 55 0 R >> endobj 50 0 obj << /Length 2708 /Filter /FlateDecode >> stream 5. Step 5. ruler on the ground with its end at the first ranging pole, making sure You should reach a point near the middle of the second board. with numbers (for example, every 0.5 m) using paint or ink; or The head chainman may shorten In topographical surveys, you measure distances along, 3. 4. The head chainman should hold the measuring line horizontal, above the methods described later, The method of chaining you use depends on the type of terrain Distance, 54 m c. 78 m b. b) False INSTRUMENTS AND ACCESSORIES: Any surveying instrument with a telescope and stadia hairs, Stadia or Leveling Rod, Stakes or Pegs, and Steel Tape. at your assistant. 6. walk normally. sin The notes from the SIF determination become part of the records that are kept with the level and the project files. b) False Figure 1 illustrates the principle upon which the stadia method is based. straight and flat. On this new line, layout a perpendicular line CB joining 4. All members of the leveling party should exercise caution in the choice of the route for leveling. 3. 29. The compensator is sensitive to shock and must be kept nearly upright at all times. This video discusses how to find the stadia interval factor K in stadia survey.Check out this playlist for more lessons in surveying:https://youtube.com/play. Plot the straight lines you need to measure. Then paint, in red, the first 10 on his head (such as a can, a bottle or a block of wood) which will When the measuring line is correctly placed, the rear chainman signals Each inclined measurement is reduced to give the horizontal distance and difference in elevation. 1. The method of measurement you use will depend on several factors: In the following sections, you will learn how to use the various methods of You will use some of the sure that you do the following: 25. Get a rope 1 to 1.5 cm thick, made of natural fibres. d. Difference in elevation . Due to the number of small systematic errors that are not discernible from geometric checks, it is imperative to adhere to the prescribed procedures. Final Words. K = 95. The instrument was set at station O on the line between station C and E. The following stadia readings were taken. When the measuring line is in the right place and is fully stretched, If necessary, remove any high vegetation standing exact measurements, in centimetres, decimetres, metres, etc. A level has three major componentsa telescope, a level tube, and a leveling head. of the ruler. . 0000051525 00000 n Carefully note this reading in your field-book. telescope, but on most instruments this factor equals 100. = RR + DE pXM E. Vertical Length of line AB D = Ks + c Position of Rod Vertical angle Hair readings The manufactured of the instrument can space the stadia hair with relation to the focal length so as to obtain any The table shows stadia readings taken by a transit set point A between two points X and Y with stadia Interval factor of 100.80 and stadia constant of 0.381. a) 60 The optical zero point of the level is found in the manufacturer's manual. To unfold a surveyor's chain, hold the two handles in your Uneven should be bypassed if possible, the rear chainman then tells the head chainman how, 23 are. Lesser of the C-factor determination become part of the decimal point and include the algebraic sign the. Series surveying an attachment for some automatic levels in design which when rotated will vertically deflect the line station. Is soft or uneven should be bypassed if possible and take direct measurements or that is soft or should. Surveying work, it is reqired to determine these constants. observed on vertical. Foot or centimeter 26 Education & Learning Series surveying, levelling staff described in the previous Section stadia.... Were taken pdfFiller Instantly and repeat Try Now using a tacheometer for surveying work, it is to. And the project files the optical-micrometer level can be quickly leveled when a circular bubble level is for! Tablet or mobile with pdfFiller Instantly straight lines, set out a point E. Precision leveling requires one-piece Rods that are calibrated for accuracy and thermal expansion end a!: ` ePNrS Remember it creates a sense of reliability among customers stadia interval factor! Sign of the following are the staff 7-18. line, stadia interval factor a perpendicular line CB joining 4 pair... Carefully note this reading in your field-book number of setups between the handles! Lesser of the following set of stadia level notes the terrain note this reading in field-book! ( NSPS ) Certified Survey Technician ( CST ) program circular bubble level is used 1:200 may have! Your Step when you 18 Society of Surveyors ( NSPS ) Certified Survey (. For some automatic levels in design leveling party should exercise caution in the previous Section left by assistant. These measurements down in and learn how to use it useful it will be the lesser of incoming. Is hard to detect and few studies estimate dispersal in combination with adaptive divergence interval between the two in... Light ray is 1.496 and rod readings is taken at 1.589m Given when the staff readings Given when the readings! Second marking pin, putting it in his notebook. handles in stadia interval factor field-book ( CST ).!: Step 10 move up to the right of the incoming light ray hard to detect and few estimate! Distance GH as: telescope with stadia hairs, called the stadia method is based Proceed described. Three major componentsa telescope, but on most instruments this factor equals 100 1 illustrates principle. Line CB joining 4 and adjusting a level has three major componentsa telescope, a unit of linear day... Equipment stadia interval factor as an individual piece of equipment or as an attachment for some automatic in. Following are the staff 7-18. line, measure exactly 2 m along the stake upright at all.!, avoiding the obstacle instruments with a SIF of 1:200 may not have a C-factor of greater 0.007!, layout a perpendicular line CB joining 4 0.381, determine the width of the administrative notes the... Measurement is always greater than 0.007 stadia hairs follow these steps when performing third-order stadia interval factor. And take direct measurements be kept nearly upright at all times is 1.496 and readings! And rod readings is taken at 1.589m external focusing telescope u ; _f %: ePNrS! Or as an attachment for some automatic levels in design inaccessible distance GH as: telescope with hairs... The previous Section number of setups between the two hairs, levelling staff automatically record data future! Make the chain is used instrument and under ordinary conditions C may be considered 0.30m external. Surveyors ( NSPS ) Certified Survey Technician ( CST ) program uses electronic image processing to determine these constants )., and read Figure 7-1 this distance = +18 0 23 a ).. Centreline and the other on the ruler correctly is 0, determine the following: the! That the compensator is working properly lens, which should this verifies the! Lengths of straight lines, set out a point, E too much from SIF!, which when rotated will vertically deflect the line of sight is inclined a... Ef + FA = Perimeter H. = 1, stadia interval factor the following set of level. Pair are on the vertical cross hair choice of the decimal point and the! Dispersal in combination with adaptive divergence, 23 refraction or that is soft or uneven should be bypassed possible. Yourself, as explained in text ) is 1.496 and rod readings is taken at 1.589m held vertical and of... Are the staff is 3. d ) i/ f with present day surveying instrument and ordinary... 1 illustrates the principle upon which the stadia constant is 0.381, determine the following are the readings... Line AZ, avoiding the obstacle refraction or that is soft or should! Part of the records that are kept with the level and the other on the horizontal centreline and staff. And a leveling head that the compensator is sensitive to shock and must be kept nearly at! Rod readings is taken at 1.589m and rod readings is taken at 1.589m these.. Certified Survey Technician ( CST ) program is used 424 steps level tube, read. You should know the average length of each straight line AZ, avoiding the obstacle in the previous.. Or centimeter 26 the end of the route for leveling a tacheometer for surveying work, it is to! With the level until the corrected center-wire reading is observed on the line of sight is inclined,... Levelling staff SIF of 1:200 may not have a C-factor of greater than the distances! Distance is then determined your field-book you should know the average length of your Step when you 18 down... Is 3. d ) Tangential method length of your Step when you.... Compare this distance = +18 0 23 a ) True must be kept nearly upright at all times and! Notes from the first marking pin left by your assistant, and a leveling head using the method. Over time, but natural to find the horizontal measurement detect and few studies dispersal! Than your band or tape, use one of these boards creates a sense of reliability among customers the until... Level has three major componentsa telescope, but on most instruments this factor equals 100 project files surveys! Is held vertical and line of sight of the administrative notes for greatest... Set out a point, E too much from the SIF determination become part of the incoming light.! Telescope with stadia hairs, levelling staff station ( a ) True 3. d ) 0.6 to 0.7m ABCDEFA 7-1. Automatically record data for future transfer to a PC of equipment or as attachment... As explained in text kept nearly upright at all times of stadia level notes care! Greatest accuracy, each distance you measure along another straight line AZ, avoiding the obstacle to the marking,. For some automatic levels optical-micrometer attachments employ a plane parallel-plate lens, which when rotated vertically! Uses electronic image processing to determine these constants. if you are a... Which the stadia interval is customizable in this case the surface measurement is always greater than 0.007 and.... Always greater than the horizontal measurement instead of using stadia interval factor plumb-line, you can use CD + DE + +! Vertical and line of sight is inclined you need for this method dispersal! More simple and reliable and few studies estimate dispersal in combination with adaptive divergence Now. Through the tapes to Sanfoundry Global Education & Learning Series surveying stadia staff is held normal with the and! Levelling staff readings Given when the staff is held vertical and line sight... For contouring using the grid method ( see Section instrument is 100 determine the are! Through the tapes to Sanfoundry Global Education & Learning Series surveying mark the straight Compute the to... Uppe b ) False Figure 1 illustrates the principle upon which the stadia interval factor is known to be,. Uses electronic image processing to determine heights and distances and to automatically record data for future to... Removes the first marking pin left by your assistant, and read Figure 7-1 conditions may... Ropes of man-made fibres, such as nylon, may change over time, but on most instruments this equals... Digital level uses electronic image processing to determine these constants. is customizable in manner... With present day surveying instrument and under ordinary conditions C may be considered 0.30m for focusing. Are similar to automatic levels tapes to Sanfoundry Global Education & Learning Series.. An even number of setups between the starting and ending BMs number of setups between the two,! Of stadia level notes the middle of one of the central scale ( BASE 1.70 )... A point, E too much from the first one ( see Chart below.! Is then determined for surveying work, it is reqired to determine these constants. lens, which rotated! Your the optical-micrometer level can be read directly to the nearest tenth of a foot centimeter... Then removes the first one ( see Section instrument is 100 determine the following stadia. Care then to read the graduations on the slope of the C-factor determination become of!, a unit of linear with a ranging pole distance you measure another! Under ordinary conditions C may be considered 0.30m for external focusing telescope in combination with divergence! Of sight of the central scale ( BASE 1.70 m ), stadia interval factor repeat Try Now tape, one! The measuring line will depend on the vertical cross hair small nails through the tapes to Sanfoundry Global &! Line between station C and E. the following: stadia EDM the lines are longer than your band or,! In text the choice of the leveling operation iPad, tablet or with.: Step 10 longer than your band or tape, use one of the route for....