大地测量学基础期末考试A(双语).doc

Final Examination-Foundation of Geodesy_2007(A) 武汉大学 测绘学院2007-2008学年第 1 学期期末考试《大地测量学基础》（双语教学）课程试卷(A)出题者Spiros Pagiatakis审核人 班级测绘工程2005级School of Geodesy and Geomatics, Wuhan University. Final Term Examination of 1st Term, 2007-2008. Course Title: FOUNDATION OF GEODESY. Question paper (A)Notes: The questions should be answered by English. Section I: Definitions (total 24 points, 3 points each).Describe the following terms in one or two sentences. You can use sketches where appropriate, if you wish. 1. CIO2. Earth’s precession 3. Gravitational field of the Earth 4. Horizontal Datum5. GAST 6. TAI 7. Conformal map 8. Deflection of the verticalSection II: Multiple choice questions (total 25 points, 5 points each)Please choose the most correct answer.1. The Earth’s free nutation (polar motion, or polar wobble) is caused bya) external torques applied to the equatorial bulge of the Earthb) the fact that the spin axis of the Earth does not coincide with the axis of the maximum moment of inertiac) the fact that the orbital plane of moon in not coincident with the equatorial planed) all the above2. Coordinated Universal Time (UTC) a) has the same rate as TAIb) UTC is different from UT1 by 3.175sc) is a solar time scaled) is equivalent to GPS time3. Apparent coordinate systems a) have their origin at the centre of mass of the Earthb) are always defined with respect to the starsc) their x-axis is always pointing towards the Greenwich meridiand) all the above4. The reference ellipsoid is also called level ellipsoid becausea) it describes, as close as possible, the Earth’s gravity field.b) its surface is by definition an equipotential surface.c) its mass is equal to that of the real Earthd) it spins with an angular velocity equal to that of the Earth5. In map projections, meridian convergencea) is the angle between two meridians on the mapping planeb) describes the fact that the meridians meet at the same point (north or south pole) c) is th