Lecture 5- 2.5.docx - Basic Geodesy Geography o The first person to use the word \u201cgeography\u201d was Eratosthenes(276-194 BC Geography goes back 2,200

Lecture 5- 2.5.docx - Basic Geodesy Geography o The first...

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Basic Geodesy Geography o The first person to use the word “geography” was Eratosthenes (276-194 BC) Geography goes back 2,200+ years! Eratosthenes was a Greek mathematician, geographer, poet, and astronomer Geography matters to GIS o Geography with its location and its associated geometry is the BASIS OF GIS and has a very long history o Geographers study and model space and make major contributions to geospatial science Geodesy o The science of the size and shape of the Earth. Questions on the size and shape of our mother earth go way back and three dominant Earth models have evolved: Flat Spherical Ellipsoidal o Circumference of the Earth is about 25,000 miles Flat Earth o Today, a “Flat Earth Society” does not strike anyone as being a serious group, but at the time when people could observe only very local phenomena, it was perfectly reasonable. o From the ground it is virtually impossible to observe a curve in the Earth Spherical Earth o Aristotle (4 th century BC – 330 BC) hypothesized a spherical Earth. He made three good arguments: Ships appear to sink at the “edge” not plummet, and they do return Stars hold different positions in the night sky in different places. Polaris (North

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