Examples
An ITM coordinate is generally given as a pair of two six-digit numbers (excluding any digits behind a decimal point which may be used in very precise surveying). The first number is always the easting and the second is the northing. The easting and northing are in meters from the false origin.
The ITM coordinate for the Spire of Dublin on O'Connell Street is:
- 715830, 734697
The first figure is the easting and means that the location is 715,830 metres east from the false origin (along the X axis). The second figure is the northing and puts the location 734,697 metres north of the false origin (along the Y axis)
The equivalent Irish Grid coordinate for the same location is:
- 315904, 234671
The Spire of Dublin example provides a fix for a location that is accurate to 1 metre. With ITM it is possible to give a more accurate coordinate for a given location by using a decimal point after the initial six figure easting and northing.
The ITM coordinate for the passive GPS station at the OSI office is:
- E 709885.081m, N 736167.699m
This ITM coordinate has three digits behind the decimal point which gives a fix for a location with millimetre accuracy. Also notice how the easting in this example is indicated with an “E” and likewise an “N” for the northing. The fact that the coordinate is in meters is indicated by the lowercase m.
With ITM there is no provision for using myriad letters and truncated coordinates as there is with the Irish Grid. Every coordinate must be given with at least a six digit easting and northing from the false origin.
Read more about this topic: Irish Transverse Mercator
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