Tag Archive: geodesy

May 31 2011

Rescue Your Floating Data


We’ve previously discussed some of the basics of geodesy, ellipsoids and the geoid,  as well as datums and projections. Now, it’s time to pull it all together into what a coordinate system is. Knowing about coordinate systems matters because this is what you interact with inside of a GIS or even CADD currently. Your project …

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May 17 2011

Where am I?


“It is clear that the earth does not move, and that it does not lie elsewhere than at the center.”                 – Aristotle (one of first to estimate size of the earth, On the Heavens, p54) We’ve talked a little about geodesy and reference ellipsoids but what is a datum? It’s pretty simple, actually. A datum …

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May 12 2011

This isn’t a Bowling Ball

Planet Earth Bowling Ball

even the most mathematically sophisticated geoid can only approximate the real shape of the earth.                          – Witold Fraczek The earth is hardly a nice sphere like a bowling ball or even a nice simple spheroid. All of our models of the earth are …

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May 11 2011

Geospatial Revolution

The Geospatial Revolution Project at Penn State University just completed an excellent 4 episode series on the world of digital mapping and how it is changing the way we think. It is well done, includes interviews some of the top people in the geospatial industry, and does a great job demonstrating the growing influence and …

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