# CONTROL POINT SURVEYING AND TOPOGRAPHIC MAPPING

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1 CONTROL POINT SURVEYING AND TOPOGRAPHIC MAPPING Shoichi Oki Land Bureau, National Land Agency, Japan Keywords: control point, survey, topography, mapping, geodesy Contents 1. Introduction 2. Geometric Background 2.1. Ellipsoid 2.2. Transformation between Geodetic Systems 2.3. Geoid 2.4. Datum Reconstruction with Space Geodesy 2.5. Surveying Instruments for Horizontal Survey Transit EDM Total Station 2.6. Survey Instruments for Vertical Survey 3. Horizontal Control 3.1. Datum Origin 3.2. Geodetic Network 3.3. Control Point surveying Triangulation Trilateration Traversing GPS in Trilateration and Traversing 4. Vertical Control 4.1. Vertical Datum 4.2. Leveling 5. Topographic Mapping 5.1. Photogrammetry 5.2 Ground Method Glossary Bibliography Biographical Sketch Summary Surveying is based on geodesy. With precise survey instrument, the Earth must be treated as an ellipsoid instead of a sphere. The ellipsoid that is chosen for geodetic survey is called reference ellipsoid. The shape of the Earth, so called geoid, is expressed as an equipotential surface of gravity. Usually, position on the ground is measured in longitude, latitude on the reference ellipsoid and height on the geoid. For convenience to measure the three dimensional values, a lot of monuments whose longitude, latitude or height is known are settled as reference point all over the countries. Control point surveying is a surveying to establish the reference point network, and is also to

3 field. Satellite imaging and GPS measuring are rapidly introduced in topographic mapping. 2. Geometric Background The first step of the geodetic control work is usually to choose a reference ellipsoid because the first approximation to the Earth s surface is an ellipsoid. Precise measurements with geodetic instruments can detect small deviations of the Earth s shape from sphere and ellipsoid as Earth s reference, while it seems perfect sphere from thge photo taken from the moon. The undulations such as mountains and hills are measured from the reference ellipsoid Ellipsoid An ellipsoid is a solid shape which is produced by rotating an ellipse around its minor axis. An ellipse is defined as a curved line which has two points geometrically termed as foci and in which the sum of distances from the two focal points to any point on the ellipse is constant as illustrated in Figure.1. If the coordinates of the foci are is 2a, and the point on the ellipse is Figure.1 An ellipse F 1(- X,0) and Px (, y) F 2(- X,0), and the sum of the distances, the ellipse is described by the equation: 2 2 1/ /2 (( x + X) + y ) + (( x - X) + y ) = 2a It is rearranged as: x / a + y / b = 1

4 where a and b respectively are termed semi-major axis and semi-minor axis of the 2 2 1/2 b= ( a - X ) ellipse where. To express the character of an ellipse, flattening f as ( a- b)/ a and eccentricity e as e = ( a - b )/ a are used in geometric geodesy. The geodetic latitude ϕ at a random point P on the ellipse is defined as an angle to be formed between a normal at the point P and the major axis. By differentiating Eq.(1), 2 2 dy / dx = -( b / a ) ( x / y) According to the definition of the geodetic latitude, dy / dx = tan( ϕ + 90) Hence, 2 2 b xsin ϕ = a ycosϕ By substituting this into the formula of an ellipse, 2 1/2 x = acos ϕ/(1- e sin 2 ϕ) y = a(1- e ) sin ϕ 2 An ellipsoid is a figure to be produced by rotating an ellipse. The expression of an ellipsoid using rectangular coordinates is: x / a + y / a + z/ b = 1 The definition of the geodetic latitude of point P in the surface of an ellipsoid is represented by angle between the normal line of the ellipse at point P and the equatorial plane. The definition of the geodetic longitude is represented by angle from the zero meridian to a meridian passing point P, as measured counterclockwise.

5 Figure.2 Ellipsoid 2.2. Transformation between Geodetic Systems Usually geodetic systems of all countries are not same. To compare coordinates between different geodetic systems, relationship between the coordinate systems must be known. Relationship between two geodetic systems is expressed by using components of revolution, ( ε x, εy, εz ) and origin shifting components ( ΔX, ΔY, ΔZ) and taking difference of scale factors (S). The relationship among the rectangular coordinates is respected as: System1 x System 2 x x y Δ = (1 + S) R3εzR2εyR1εx y +ΔY z Δz z where ( R1, R2, R3) represent matrices of revolution for axes x, y, and z :

6 - - - Bibliography Figure 3. Transformation from Geodetic System 1 to Geodetic System 2 TO ACCESS ALL THE 15 PAGES OF THIS CHAPTER, Visit: Heiskanen W. A. & Moritz H.(1967) Physical Geodesy, W. H. Freeman and Company [A textbook of height and geoid] Leick A. (1995): GPS, Satellite Surveying, 2nd edition, John Wiley & Sons, Inc. (ISBN ) [This book presents elements and computations of Global Positioning System and geodetic analysis on the ellipsoid.] Mikhail E. M.(1976): Observations and least squares, IEP Dun-Donnelley, Harper & Row [ This book presents theory of the least square method for observation data analysis] Schwarz C. R.(ed.) (1989): North American Datum of 1983, NOAA Professional Paper NOS 2 [This book presents detailed report how to reconstruct the North American Datum with space geodetic technologies] Takahashi F., Kondo T., Tkahashi Y, and Koyama Y.(2000): Very Long Baseline Interferometer, IOS Press (ISBN ) [This book presents basic concepts, data analysis, and geodetic applications of VLBI.] Torge W.(1991): Geodesy, 2nd ed., de Gruyter [A textbook of height and geoid]

7 Vanicek P. and Christou N. T.(1994): Geoid and its geophysical Interpretations, CRC Press [A textbook of height and geoid] Vanicek P. and Krakiswsky E.(1986): Geodesy : the concept, Elsevier [A textbook of height and geoid] Biographical Sketch Shoichi Oki holds a B.Sc in Science from Tohoku University and an M.Sc in Science from Tohoku University. His master s research was analysis of plasma waves in space by Very Long Baseline Interferometry(VLBI) survey and computer simulation. He was hired after graduation from the university by Geographical Survey Institute (GSI). He conducted geodetic survey, topographic mapping and digital mapping. During 1991 to 1993 he was transferred temporarily to the National Land Agency as a chief of National Land Information Office. During 1996 to 1997 he stayed in Germany as a guest scientist of Technical University Munich to research digital photogrammetry. During 1997 to 1998 he worked to establish International VLBI Service as the VLBI group leader of GSI. He participated in basic survey planning and system reforming of survey as a member of strategic planning team of GSI. In he was prompted to the Deputy Director for cadastral survey of the National Land Agency.

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