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aeroTRANSCRIPT
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LOGO
Geomatics for Air Navigation
C04: Datum definition. Horizontal and vertical datums. Coordinate transformations.
Eng. Tiberius TOMOIAGĂ, PhDPhone: 0722.91.46.22Email: [email protected]
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Revenge of the Shift
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Ellipsoid
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3D Coordinate System
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What's a Datum? Prior to satellite mapping technology, the
best approximation of the shape of theearth was the geoid, which evolved intoslightly flattened spheroids or ellipsoids.
Geographic coordinate systems use aspheroid to calculate positions on theearth.
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Datum definition Geodetic datums define the size and
shape of the earth and the origin andorientation of the coordinate systems usedto map the earth.
A datum defines the position of thespheroid relative to the center of the earth.
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The origin of the WGS84 ellipsoid is at the Earth’s center of mass, which makes it ideal for a GPS datum
Datum definition
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Datum definition
Datum Origin on Surface of Earth
Ellipsoid Model based on less precise surveys
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Datum definition
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Datum shift
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Common Datum Shift Parameters
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Common Datum Shift Parameters
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Common Datum Shift Parameters
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Common Datum Shift Parameters
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Common Datum Shift Parameters
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Common Datum Shift Parameters
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European vertical datums
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ellipsoid
geoid
N
Vertical datum
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Importance of datums
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Importance of datums
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Coordinate transformation
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Coordinate transformation
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Coordinate transformation
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Coordinate transformation
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Coordinate transformation
Where:- ∆X, ∆Y, ∆ Z – translations (shifts)- rx, ry, rz – rotations- s - scale factor
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Coordinate transformation
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Coordinate transformation
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Coordinate transformation
20 0 0cos cos cos sin sin sini i i i i i iN a X Y Z a fϕ λ ϕ λ ϕ ϕ∆ = ∆ + ∆ + ∆ + ∆ + ∆
Vertical datum transformation: geoidheight differences between differentdatums (e.g. WGS84 and PZ90).
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No Questions?......