We must use the correct "Geographic Transformation" to convert between some datums. An Approximation To measure and specify coordinates on a 3D surface, one first must define the geometry of the surface itself. Test Your Knowledge. OLM Archives Thus, new datums are constantly evolving. Nevertheless, all these datums are mathematically documented so that transforming from one datum to another can be calculated.
These calculations are normally embedded in GIS software and such calculations can be performed with a few strokes or clicks on the mouse.
Now that the measurement of the land surface has been accomplished, another problem needs to be addressed. Remember that a map is a transformation from the real, not perfectly round, three-dimensional world onto a twodimensional flat piece of paper or digital display surface.
This transformation cannot occur without geometric error. This is where the understanding of map projections is important. Depending on the method used to cast latitude and longitude onto a flat surface, every resulting projection cannot accurately maintain both size and shape properties of the landmasses simultaneously. One or the other or both properties must be sacrificed. Rather, he sailed to try to find a quicker route to the Indes going West instead of East, knowing that a round earth means you can go either way.
The myth that people once believed the earth was flat was created by authors such as Draper and Dickson in order to exaggerate the conflict between religion and science. Topics: flat earth , flat earth myth , geology , oblate spheroid , round earth. It is an oblate spheroid. Is the Earth round? The Earth is an irregularly shaped ellipsoid.
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