How do we describe a location on Earth? Geodetic reference system
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1 How do we describe a location on Earth? Geodetic reference system
2 How do we define the shape of the earth? Definition of the sphere: A three-dimensional surface, all points of which are equidistant from a fixed point.
3 The Earth as a sphere... Rotational axis Poles = ends of the earth's rotational axis Equator = an imaginary line on the Earth's surface equidistant from the north pole and south pole North pole South pole Ecuator
4 Spherical coordinate system 135 W 150 W E 120 W 150 E 105 W 135 E Coordinates in latitute and longitude 90 W 120 E 75 W 105 E 60 W 90 E 45 W 75 E 30 W 60 E 15 W 0 15 E 30 E 45 E
5 Points of known positions = stompunkter Coordinates in lat/lon Elevation (above the ellipsoid)
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10 Parallels = Imaginary lines running around the earth parallel to the Equator. The equator corresponds the great circle perpendicular to the Earth's axis, determining the division of the Earth in two hemispheres: North and South 5 major parallels: Arctic cirle Tropic of Cancer The Equator, the 0 parallel Tropic of Caprion Antarctic Circle
11 Latitudes The latitude of a point on the Earth's surface is the angle between the plane of the equator and the straight line segment that joins the point to the center of the globe N 0-90 S Note 1: In computers, North is positive, South is negetive: lat: 15 S = -15 Note 2: Always use N/S in written form: lat/ 15 S, not -15
12 Latitudes gives the position in N-S direction 2 What is the approximate latitude of point 1? 1 How about point 2?
13 Meridians = half of great cicrles that all come together at the North pole and South pole Prime meridian = 0 degrees, passes through Greenwich Ranges: degrees W degrees E
14 Longitudes = The angle between the plane of the prime meridian and that of the meridian through a point. East-west direction Longitudes 1 = 15 W 2 = 15 E 3 = 135 W 4 = 90 W Note! In computers, West has negative values and East has positive values: Lon: 15 W = -15 Note 2: Always use W/E in written form: Lon/ 15 W, not -15
15 Longitudes the position in E-W direction 2 What is the approximate longitude of point 1? 1 How about point 2?
16 Tachymeter/Tacheometer for distance and topography = Instrument for fast measurements of distances and heights
17 Measurement method: Traverse Traverse = to estimate the coordinate pair of a point when you know: * angle * distance to a point with known coordinates. Example: A (x, y) = , Distance AP = 2352 meters α = 45 Xp = (2352 * sin 45) = Yp = (2352 * cos 45) =
18 Measurement method: Traverse Traverse = to estimate the coordinate pair of a point when you know: * angle * distance to a point with known coordinates. Example: A (x, y) = , Distance AP = 2352 meters α = 45 Xp = (2352 * sin 45) = Yp = (2352 * cos 45) =
19 Plain coordinate systems Unit = meters Swedish national reference system = SWEREF99 X = m, Y = m So where is 0 meters then?
20 What do the values mean? = m = m So where is 0 meters then? What do the values mean?
21 What do the values mean? = m = m 0 m (x) = meridian in the Atlantic = m (y) = the equator
22 Ground meas. - Heights Differential leveling Point A = known height. Point B = unknown. Leveling instrument is placed between A and B. 1. Back sight measurement (BS) off of a leveling rod on A. HI (BS + height at A) 3. Rod is turned to point B. 4. Telescope rotated to measure fore sight height (FS). 5. Height at B = HI - FS. Image from: Wolf & Brinker, 1994
23 Levelling work on long distances
24 Quiz
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26 Solution to question 2
27 Determine position from satellites Navigation Satellite System GPS = Global Positioning System (USA) Start: 1973/1978 (American defense dep.+ air force), Officially: Selective availability (SA) until: m error Name: Navigation Signal Timing and Ranging GPS (NAVSTAR) More at:
28 GPS 3 main segments: Space Segment = constellation of satellites Control Segment = ground receivers User segment = the receivers
29 HOW DOES IT WORK? Trilateration: the angles of a triangle can be determined if the lengths of all sides are known. GPS extends this principle in 3 dimensions. GPS receivers calculate distance as a function of time from satellite to receiver. Distance = velocity * time
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