![]() See the section on Projections for more information about projection methodologies. However, also in this modern digital era, people like to know locations precisely so even a small difference may be significant.Ī projection is a process which uses the latitude and longitude which has already been ‘drawn’ on the surface of the Earth using a datum, to then be ‘drawn’ onto a ‘flat piece of paper’ - called a map. ![]() Also, in the modern digital era, techniques have vastly improved and many modern datum are very similar to each other. Refer to the section on the Earth’s coordinate system.īecause there are different ways to fit the mathematical model to the surface of the Earth, there are many different datums. » from here calculations are made to fit this mathematical model to the surface of the Earth - firstly the Equator, then North and South Poles and then lines of latitude and longitude. » mathematically a ’round’ surface (a modified sphere) is created which represents the surface of the Earth The basic mathematical/geometric principle which is used is that: This confuses many people. In simple terms:Ī datum is a system which allows the location of latitudes and longitudes (and heights) to be identified onto the surface of the Earth - ie onto the surface of a ’round’ object. What is a Datum and how is it Different to a Projection? Once you understand the principles being outlined in these two sections it is recommended that you use the hyperlinks to more complex sites if you wish to better understand the intricacies associated with datums. ![]() In the case of Datums this is particularly true. As Datums is a ‘jargon rich’ discipline it is recommended that you read this Section first.Īs with all the Modules in this package, ICSM is trying to explain often complex situations using very simple language. The content of these two is very similar, but as their titles suggest, they supply different levels of information. ![]()
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