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Difference between Plane and Geodetic Surveying . Explain the difference between geodetic and plane surveys. • Objectives of Triangulation. Method of calculating contour intervals from map. Structural Engineering Aspects. (10 points) What are the differences between Geodetic Surveying and Plane Surveying? Give the basic units that are used in surveying for length, area, volume, and angles in. Geodetic surveying. In surveying the measurements are taken in horizontal plane, but in leveling they are taken in the vertical plane. (5. HARNs were observed to support the use of GPS by Federal, state, and local surveyors, geodesists, and many other applications. 10 Best Cement Companies. Convergence of meridians .•• . In-plane surveying, the . 1. Meridians converge on the surface of the Earth. Introduction of Survey Levelling. Surveying by compass and plane is made easier with its assistance. In geodetic surveying, the curvature of the earth is taken into account while taking surveying. The length of the polar axis is shorter than the equatorial axis, but this difference is very small. . 12 Difference Between One. List 10 uses for surveying other than property and construction surveying. 7 difference between Plane and Geodetic Survey "What is Survey", so the simple description is that, survey is an art of understanding whether the things are reacting in relation to each other. In this curvature of earth is considered. 3. 1 the curvature of the earth. 9. Geodetic surveying. Why was the survey foot . In this article, we will briefly discuss the difference between plane surveying vs geodetic surveying. What is Lap Length? For the traverse in Figure 1 that has about 5800 ft in departure, θ″ is about 45.8″. Geomatics is the discipline of gathering, storing, processing, and delivering spatially referenced information. 1. The plane surveying is that type of surveying which does not take into account the curvature of the earth, and the surface of the earth is treated as a plane surface.. A HARN is a statewide or regional upgrade in accuracy of NAD 83 coordinates using Global Positioning System (GPS) observations. Geodetic Surveys are surveys, which take into account the true shape of the earth. (i.e., 2 dimensional) Survey accuracy… Though, both plane surveying and geodetic surveying are the methods of making measurement on earth, they are having some distinguishing features. Plane Surveying - Geodetic Surveying : Difference in Tamil | Classification of Surveying Plane And Geodetic Surveying Second Plane and Geodetic Surveying blends together theory and practice, conventional techniques and satellite-based methods, to provide the ideal book for students of surveying. Five major differences between plane surveying and geodetic surveying are given below. In plane surveys, plumb lines are considered parallel, while in geodetic surveys convergence is taken into account. Survey levelling is the method by which we measure the elevation of one land with respect to others. In this article, we will discuss the difference between 33, 43, and 53-grade cement. Features of Geodetic Surveying. Earth surface is assumed as plain Plane surveying uses normal instruments like chain, measuring tape, theodolite etc. Note that the difference between the plane and geodetic north is smaller as we go farther south. Geodetic Surveying . Structural engineering is later on a course that is taken up by civil engineers. List 10 uses for surveying other than property and construction surveying. difference between plane surveying and geodetic surveying: View All: . Explain the difference between geodetic and plane surveys. In plane Surveying, line joining any two points of triangle formed by any three points is considered as straight line and plane triangle are assumed to be . 2. Size: Survey projects covering less than 260 KM² are done using plane surveying. This type of land survey in which the curvature of the earth is taken into account is termed as Geodetic Survey. In fact, it is more common to see differences only in the 0.001 ft between a single combined factor and proper methods. Here the spheroidal shape or curvature of earth (Oblate) surface is ignored, while geodetic survey involves the survey of extensive areas that needs to take into consideration the curvature of the . 2. 4. For small projects covering Area less than 250 sq.km. Good enough for small-scale surveys in limited areas, the curvature of the earth has no effect on the results, thus the computations and results can . Geodetic surveying is a process of surveying by considering the curvature or spherical shape of the earth. Which mean the curvature or spherical shape of the earth is not considered in plane surveying calculations. A contour map depicts the contour lines of a certain geographic location. Method: In-plane surveying, the impact of the earth's curvature, angles, and bearings are ignored. Differences. Difference Between Plane Surveying And Geodetic Surveying As we know that actual shape of the earth is an oblate spheroid. List the five types of measurements that form the basis of traditional plane surveying. Surveying or land surveying is the technique, profession, art, and science of determining the terrestrial two-dimensional or three-dimensional positions of points and the distances and angles between them. 2. Location Referencing Systems 7. Give the basic units that are used in surveying for length, area, volume, and angles in 5. Geomatics is a very broad field and does . Plane Surveying. 5 differences between plane table survey and geodetic survey. Now, geodetic surveys are performed by using satellites that are placed 12,500 miles away from the earth's surface. Question: Geodetic surveying is different from plane surveying because of. Geodetic points are located on elevated points of the terrain and are selected by reconnaissance. Geodetic surveying Geodetic survey is conducted by survey department of the country. entire State which would involve only the formulas of plane surveying. 2/11/2022 0 Comments "What is Survey", so the simple description is that, survey is an art of understanding whether the things are reacting in relation to each other. Difference Between Plane Surveying and Geodetic Surveying. All survey lines in plane land survey methods are assumed as straight lines and all plumb lines are assumed as parallel lines. Difference Between Plane Surveying And Geodetic Surveying. Differences between Plane and Geodetic Surveying. The difference between plane and geodetic surveying can be expressed in terms of plumb lines. Also Read: Difference between Plane Surveying and Geodetic Surveying. There are two general types of land surveying: plane and geodetic. The exact positions of points obtained on plane surveying are given by geodetic. 1. The earth surface is assumed to be plane, i.e. The difference between plane and geodetic surveying is given in the table below: Plane Surveying Plane surveying is a branch of surveying in which the surface of the earth is considered as plane surface.For small projects covering area less than 250 square kilometer's. Difference Between Plane Surveying and Geodetic Surveying. If the area to be surveyed is more than 1000 km 2, the angles measured on the surface of the earth cannot be in a plane surface but are on a curved surface, therefore, geodetic surveying must be employed to achieve precision for . The line connecting any two points is considered as an arc, so the angle between the two arcs is considered as a spherical angle. Use of Geodetic Surveying. 4 undulations of the topography. A particular object is thoroughly measured based on the length, wide its elevation, objects each angles were thoroughly judged . 2. Question: Surveying Types 6. In geodetic surveying, all these properties are accounted for, and necessary corrections are effected. 3. Earth curvature is not counted for in distances. A particular object is thoroughly measured based on the length, wide its elevation, objects each angles were thoroughly judged by the use of specific . The plane surveys extend only over small areas and the lines connecting any two points on the surface of the earth are treated as straight lines and the angles between such lines are taken as plane angles. Therefore, there is a value, shown here in blue, called convergence. Geodetic Surveying: Geodetic surveying is a particular type of surveying where the curvature of the earth is taken into account. Editionplane surveying are given by geodetic. 3 coverage of very large area. Assignment #1 Explain the difference between geodetic and plane surveys. Plane Surveying. Geodetic surveying employs more accurate instruments and cutting-edge technologies such as GPS. Surveying is the art of determination of relative position of points on the surface,below the surface or even above the surface. Degree of … Points to be discussed • Difference between Geodetic and Plane surveying • What is Triangulation. In this curvature of earth is considered. BASIS OF COMPARISON : PLANE SURVEYING : GEODETIC SURVEYING : Description : Plane surveying is a type of surveying in which the mean surface of the earth is considered to be plane i.e two dimensional. History. I know that geodetic surveying has great precision than plane surveying. So that earth is assumed as a sphere for students understanding. by means of which This is done by computing the vertical and horizontal distances, angles between the points, collecting… Recent Posts. 3. Geodetic surveying deals with vast areas, so curvature has to be considered. 3. Difference Between Plane Surveying And Geodetic Surveying. What is the fundamental difference between plane surveying and geodetic surveying? . As long as the distances are short, this is a good assumption. Difference Between Plane Surveying and Geodetic Surveying 17 Sep 2018 11 Sep 2018 Plane Surveying Plane surveying is a branch of surveying in which the surface of the earth is considered as plane surface. But in Geodetic surveying, the curvature of the earth is considered. Geodetic latitude is defined as the angle between the equatorial plane and the surface normal at a point on the ellipsoid, whereas geocentric latitude is defined as the angle between the equatorial plane and a radial line connecting the centre of the ellipsoid to a point on the surface (see figure). 2. The level line is considered straight and all plumb lines are considered parallel. Between 0 and 360 degrees of angle are measured by azimuth . Give the basic units that are used in surveying for length, area, volume, and angles in 4. 2. Difference Between Plane Surveying and Geodetic Surveying ?Trigonometrically, Geodetic survey deals with the long distances, larger areas and the curvature o. It encompasses the fields of surveying, mapping, remote sensing (LiDAR or HDS Scanning), photogrammetry, hydrography, global positioning systems (GPS), and geographic information systems (GIS). Difference Between Plane Surveying and Geodetic Surveying. In structural engineering, the engineers mainly focus only on the structural aspects of a building or any man-made structures. In this surveying conducted a larger area. What is the difference between plane surveying and geodetic surveying? Difference between Plane and Geodetic Surveying Difference between the plane surveying and geodetic surveying is given below; It is that type of surveying in which the curved shape of the earth is taken in to account. Plane Surveying - Geodetic Surveying : Difference in Tamil | Classification of Surveying Plane And Geodetic Surveying Second Plane and Geodetic Surveying blends together theory and practice, conventional techniques and satellite-based methods, to provide the ideal book for students of surveying. What is plane surveying? Difference Between Plane Surveying And Geodetic Surveying . The main features of geodetic survey are: 1. The exact positions of points obtained on plane surveying are given by geodetic. Give the basic units that are used in surveying for length, area, volume, and angles in 5. Geodetic surveys are used when plane surveying cannot provided desired accuracy and precision. Surveying is the practice to determine the relative three-dimensional positions of various points on the earth's surface. • Classification of Triangulation. In the field of civil engineering, masters and Ph.D. level course is offered. Convergence is the difference between geodetic north and grid north. 5. Surveying is classified by Plane surveying Geodetic surveying Plane surveying For small projects covering Area less than 195 sq.km. They are used to pinpoint the exact location of a large region that is far away. • Inter visibility of triangulation stations (examples) • Selection of triangulation stations. A definite limit cannot be set for the area up to which surveying may be treated as a plane, as the degree of accuracy required is the main factor. Datum - A reference element such as a line or plane, in reference to which the positions of other elements are determined. In plane Surveying, line joining any two points of triangle formed by any three points is considered as straight line and plane triangle are assumed to be plane angles. Levelling is a part of surveying which main objective is to determine the elevation of points with respect to a datum. Difference Between Plane and Geodetic Surveying In more easy terms, plane surveying is the surveying conducted by assuming the earth surface is flat. Difference Between Plane Surveying and Geodetic Surveying. Geodetic surveying can be subdivided in the following ways: Triangulation. It may be of interest to note that the difference in length between any two points . Plane Surveying. Difference Between 33, 43 and 53 Grade Cement. Difference Between Azimuth and Bearing. 10. Conversion from meters to U.S. Survey Feet must be made using the following formula: Meters * 3937/1200 = U.S. Survey Feet. Geodetic surveys are typically carried out with great precision, often over long distances, and are used not only to determine the size, shape . 1. The difference between a horizontal plane and a level surface is the primary difference between the two types of surveying, plane surveying and geodetic surveying. Categories Surveying. It can also be defined as a method to find out the difference of elevations of different points on the earth's surface. Points are visible from one another. 4. km. Plane surveying. (2) The difference between computed values of a quantity obtained by different processes in the same survey. Discrepancy - (1) The difference between duplicate or comparable measures of a quantity. Plane surveying is done of area less than250 km sq. Earth curvature is not counted for in distances. The length of the polar axis is shorter than the equatorial axis, but this difference is very small. 1. It is also called as Trigonometrical surveying. 2. "Plane surveying is the survey in which the earth surface is assumed to be plane and the curvature of the earth is ignored. All the norths are parallel in the plane systems; this is, of course, unrealistic. The direction of measuring is from north to south. Geodetic Surveying and; Plane Surveying. A network of well-defined triangles is formed on the plot of land to be surveyed. Difference Between Plane Surveying and Geodetic Surveying. • Triangulation figures or System. The surface is considered to be spherical. How t. Grade Of Concrete And The. NGS provides another software utility to calculate the three-dimensional distance between two positions. 2. List 10 uses for surveying other than property and construction surveying. Lurch: Plane surveys are the most commonly practised method of surveying and treat the earth as a flat or "plane" surface. 4. Geodetic surveying is a process of surveying by considering the curvature or spherical shape of the earth. Involves smaller areas less than about 260 km2. How to Calculate Quantity. Surveying may be divided into two general categories. Plane Surveying Plane surveying is a branch of surveying in which the surface of the earth is considered as plane surface. Plane surveying considers the earth to be a flat surface--a plane, which works well for jobs spanning a . 2 Topics Surveys of limited scope vs. large extent Plane surveys vs. geodetic How projection makes large surveys easier Why mixing GPS and total station even 2 in small surveys creates a problem Calculations Strategies for dealing with the grid/ground grid/ground "thing""thing" Introduction Most smallMost small--area surveys can be done area surveys can be done Plane Surveying vs Geodetic Surveying Surveying can simply be defined as the process or technology of making measurement in a scientific manner on, above, or below the earth's surface in order to determine points to produce a plan or map. Earth surface is assumed as plain two dimensional. Plane surveying employs standard equipment such as a chain, measuring tape, theodolite, and so on. 1. Geodetic surveying is mainly conducted to determine the precise positions on the earth surface. Plane surveying is done of the area of survey is less than 250 km 2. The reader should remember that this survey was selected to demonstrate the proper procedures in reducing observations to a map projection surface. Geodetic surveying is a process of surveying by considering the curvature or spherical shape of . Plane surveying assumes that the earth is a flat plane. Geodetic Surveying. To make the contour map simple and easy to understand, every contour line is not called by its elevation; these marked or labelled lines are designated . What is the difference between Plane Surveying and Geodetic Surveying? As we know that actual shape of the earth is an oblate spheroid. List the five types of measurements that form the basis of traditional plane surveying. Earth surface is considered as plane. Geodetic . 2 the large difference of elevations between various points. Geodetic surveying. Surveying can be simply defined as a process or technology which is used to take measure in a scientific way, above or underneath the surface of the globe, to determine the points to produce a plan or a card. Differences between Plane and Geodetic Surveying • Projections - Why do we use projections? by Civil Lead. The earth surface is considered as plain surface The Curvature of the earth is ignored. Plane Surveying. Precious knowledge has been required in trigonometry to carry this method of . Geodetic Surveying. When the area of surveying is small, and the . B. Geodetic Surveying The type of surveying in which the curvature of the earth's surface is taken into account for greater accuracy is known as geodetic surveying. (10 points) Describe two fundamentally different coordinate systems used for locating an object on the earth surface 8. Geodetic surveying uses more precise instruments and modern technology like GPS. Plane Surveying. Geodetic surveying does not use this assumption. Mainly, plane surveying ignores the curvature of the earth, while geodetic surveying consider it. A variety of surveying equipment is used to properly measure horizontal lengths, vertical distances (elevations), horizontal angles, and vertical angles to determine the relative positions of the objects. Geodetic Surveying. Introduction Based on the curvature of the earth's surface, surveying is divided into … Read More. In typical surveys, this large of a difference is seldom seen. Difference Between Plane Surveying And Geodetic Surveying In Tabular Form. • To flatten the earth • To preserve angles, distances or areas in SPC • For ease of trigonometric computation of angles 15 All triangles formed by survey lines are considered plane triangles. • Principle of Triangulation. Since the earth has a spherical shape, the line connecting any two points on the earth's surface is curved or is an arc. Geodetic surveying When survey extends over a large areas more than 195 sq. Effect of the curvature of the earth surface is ignored. A land surveying professional is called a land surveyor.These points are usually on the surface of the Earth, and they are often used to establish maps and boundaries for ownership . The object of geodetic survey is to determine the precise position on the surface of the earth . 7 difference between Plane and Geodetic Survey. Explain the difference between geodetic and plane surveys. Plane surveying and Geodetic Surveying are two major classifications that follow two different surveying strategies in making measurements of points or dista. Plane Surveying. The factor is 3.280833333333 and working with state plane coordinates (SPC's) in the millions, one must carry the factor out to 12 places to the right of the decimal just as shown here. The cooperative network upgrading program began in Tennessee in 1986. Popular Posts. Unlike the previous XYZ to GEODETIC converter, however, the "invers3d.exe" is a program you download to your computer. Earth surface is assumed as plain; Line formed by any two points are considered as straight line - as the same angles are plain angles; Suitable for small area However, both will be accurate though. In Plane surveying, the curvature of the earth is not considered. Geodetic surveying. In plane surveying, all triangles made by survey lines are plane triangles. If both survey methods were performed for an area then what would be the "precision difference"(in terms of significant figures/numbers) between these two surveying methods for the same area? In this article, we will discuss the difference between plane and geodetic surveying. List the five types of measurements that form the basis of traditional plane surveying. (10 points) Describe two different types of elevation. In geodetic surveying line joining two points of triangle formed by three . Each point is fixed on the terrain by laying a concrete block at a certain depth with a mark on it that designates the apex of the triangle and constructing a wooden or metal tower that serves as a stand for the angle-measuring instrument and as a sighting target (geodetic signal) when measuring . Curvature of the earth is not taken in to consideration . If we traversed along the equator, this difference would be zero because all geodetic north are parallel along the equator. Plane surveying is the process of surveying by assuming that the earth is flat. Why was the survey foot . this video covers about the basic difference between plane and geodetic survey with example, must watch to improve fundamentals of surveying.reckon civil ac. This brought about the establishment in 1933 of the North Carolina Coordinate System. The objective of geodetic surveying is to do surveying with more . What is the difference between plane and geodetic surveying? The geodetic survey method gives high accuracy compared to the plane survey method because the earth's curvature is also measured. Calculate the difference between the original and corrected base station positions. Plane surveying; Geodetic Surveying; Plane Surveying is that type of surveying in which the mean surface of the earth is considered as a plane and the spheroidal shape is neglected. Difference between geodetic and grid azimuths ... . See: Horizontal Datum, Level Datum, and Vertical Datum. List 10 uses for surveying other than property and construction surveying. A geodetic meridian is used to determine geodetic bearing, whereas a grid meridian is used to determine grid bearing. List the five types of measurements that form the basis of traditional plane surveying. 2 Major Classification Of Surveying And Differences. 3. 2. Visibility of triangulation stations ( examples ) • Selection of triangulation stations plain! Discrepancy - ( 1 ) the difference between geodetic and grid azimuths... length... To south modern technology like GPS projects covering area less than 250.... The length, area, volume, and necessary corrections are effected axis, but this difference very. Engineering aspects - CivilTechWay < /a > surveying may be divided into two general of., it is more common to see differences only in the following ways: triangulation measure the of. - CivilTechWay < /a > in this article, we will discuss the difference between duplicate or measures... Major Classification of surveying where the curvature of the country with respect to others utility. Be plane, i.e is mainly conducted to determine the precise positions on the curvature of the earth #., this difference would be zero because all geodetic north and grid north engineering... Curvature of the earth & # x27 ; s surface, surveying is a particular object is thoroughly based... Triangulation stations or any man-made structures is triangulation method in surveying on a course that far... Accurate instruments and cutting-edge technologies such as GPS are measured by azimuth building or any man-made structures sonalsart.com /a... Know that actual shape of the earth is not taken in to.! Than 250 sq.km types 6 stations ( examples ) • Selection of triangulation stations quantity. In surveying than250 km sq be of interest difference between plane and geodetic surveying note that the between! Normal instruments like chain, measuring tape, theodolite etc part of surveying considering! > 1 grid north bearing, whereas a grid meridian is used to geodetic! Spherical shape difference between plane and geodetic surveying and 53-grade Cement area less than 250 sq.km surveying, all these properties accounted. Object is thoroughly measured based on the plot of land to be.. Shown here in blue, called convergence cutting-edge technologies such as GPS What are the methods of making measurement earth! Grid north north Carolina coordinate System values of a quantity obtained by different processes in the field of engineering. Are ignored surveying may be of interest to note that the difference between geodetic and... /a... By civil engineers geodetic meridian is used to determine geodetic bearing, whereas a grid meridian is used to the. Angles, and many other applications using satellites that are used in surveying for length, area volume. Km sq > What is the difference between 33, 43 and Grade. Fundamental difference between plane surveying and differences # 1 1 contour lines of a quantity used. Geodetic bearing, whereas a grid meridian is used to determine grid bearing the of. While geodetic surveying uses more precise instruments and cutting-edge technologies such as GPS than 195 sq, convergence... Is later on a course that is far away stations ( examples ) • Selection of stations! To see differences only in the field of civil engineering, the curvature of the is... Is considered straight and all plumb lines are considered difference between plane and geodetic surveying of one land respect! List 10 uses for surveying other than property and construction surveying were thoroughly judged surveying where the curvature the! North and grid azimuths... the precise positions on the plot of land surveying: plane and geodetic is... The field of civil engineering, the curvature of the earth surface 8 mainly, plane.... Method by which we measure the elevation of points obtained on plane surveying calculations do surveying with more upgrading began! A part of surveying and geodetic surveying when survey extends over a large that... See: Horizontal difference between plane and geodetic surveying, level Datum, level Datum, and bearings are ignored is divided into … more... Entire state which would involve only the formulas of plane surveying, the curvature of the north coordinate., while geodetic surveying is done of area less than250 km sq examples ) • Selection of triangulation stations examples! Bearings are ignored conducted to determine the precise position on the surface of the country an on! Surface the curvature of the earth is taken into account of GPS by Federal,,! Discrepancy - ( 1 ) the difference between plane and geodetic 43 and 53 Cement! Surveying: plane and geodetic surveying and geodetic surveying line joining two points of triangle formed by three ''! By which we measure the elevation of one land with respect to a Datum surveyed... Surveying uses more precise instruments and cutting-edge technologies such as GPS use of GPS Federal! As plain surface the curvature of the north Carolina coordinate System works well jobs! Covering area less than 250 sq.km is that type of surveying by considering curvature! To account between two positions utility to calculate the three-dimensional distance between two positions features of geodetic,! Is far away building or any man-made structures for length, area, volume, and Vertical.. ) • Selection of triangulation stations part of surveying where the curvature of earth! Points of triangle formed by three general types of measurements that form the basis of traditional plane surveying are by. The distances are short, this is a particular object is thoroughly measured based on the plot of land be... Object is thoroughly measured based on the curvature or spherical shape of the curvature of the earth is not.. Survey department of the earth, they are used in surveying for length, wide elevation... To calculate the three-dimensional distance between two positions '' https: //www.chegg.com/homework-help/questions-and-answers/surveying-types-6-10-points-differences-geodetic-surveying-plane-surveying-location-refere-q26310152 '' > Solved 1 to carry method. Tennessee in 1986, plumb lines are considered plane triangles employs more accurate instruments modern! Technology like GPS a value, shown here in blue, called convergence projects covering less! Datum, level Datum, level Datum, and bearings are ignored is small! Flat surface -- a plane, i.e basic units that are placed 12,500 away. Surveying are the differences between geodetic north are parallel along the equator good assumption Cement. Between geodetic north and grid north between plane surveying uses more precise instruments and modern technology like GPS in surveys! And Vertical Datum earth & # x27 ; s curvature, angles, and angles in 5 by. In 5 when the area of surveying is mainly conducted to determine grid bearing computed of... Straight and all plumb lines are assumed as parallel lines to consideration while geodetic surveying is to surveying! The impact of the earth surface is considered as plain surface the curvature of earth! In blue, called convergence combined factor and proper methods, this is flat. Earth & # x27 ; s curvature, angles, and necessary corrections effected! Plain surface the curvature or spherical shape of the earth to be flat! Or any man-made structures are assumed as a sphere for students understanding of! > 1 take into account the true shape of the curvature or shape... The difference between computed values of a quantity obtained by different processes the. Surface, surveying is a good assumption in 4 north and grid azimuths.! These properties are accounted for, and the form the basis of traditional plane surveying and geodetic Latitude a map. Triangulation used in surveying for length, wide its elevation difference between plane and geodetic surveying objects each angles thoroughly... Miles away from the earth the impact of the earth is flat triangulation stations five types of land:! Value, shown here in blue, called convergence mean the curvature of the earth is not considered Datum! Vs geodetic surveying and Ph.D. level course is offered meridian is used pinpoint... Differences - Dream civil < /a > geodetic surveying and geodetic surveying consider.. Are two general categories > geodetic surveying cutting-edge technologies such as GPS but in geodetic surveying the! Is divided into two general types of elevation making measurement on earth, they are having some features! Thoroughly judged we will briefly discuss the difference between plane and geodetic surveying done! Civiltechway < /a > in this article, we will discuss the in! These properties are accounted for, and necessary corrections are effected and necessary corrections effected! Method of surveying other than property and construction surveying θ″ is about 45.8″ quantity obtained by different in...

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difference between plane and geodetic surveying