33:
442:
588:
This ITM co-ordinate 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 co-ordinate is in metres is indicated by the lowercase
506:
ITM and the older more established Irish Grid will (initially at least) be used in parallel. As a result ITM coordinates had to be obviously different so users would not confuse the two. This was done by shifting the ITM false origin further into the
Atlantic and thereby creating substantially
434:
510:
While OSi and OSNI intend to supply map information in the older Irish Grid format into the future, the Irish
Institution of Surveyors has recommended that ITM be adopted as soon as possible as the preferred official co-ordinate system for Ireland.
495:
co-ordinate system partly fulfilled the requirement for direct GPS compatibility it had some drawbacks, including varying levels of distortion across the island due to the central meridian being at the west coast of
Ireland.
577:
for a location that is accurate to 1 metre. With ITM it is possible to give a more accurate co-ordinate for a given location by using a decimal point after the initial six figure easting and northing.
392:
214:
382:
350:
499:
The new system needed to satisfy various criteria: GPS compatibility, map distortion for the whole island of
Ireland had to be minimal, it was to be
360:
937:
340:
911:
Detailed converter: ITM, UTM, Irish Grid, War Office Irish Grid, Bonne
Projection, Decimal/Deg. Min. Sec. Lat. Long. with multiple datums.
917:
465:
952:
836:
831:
807:
121:
825:
420:
947:
877:
206:
942:
492:
445:
An illustration of ITM coordinates over a map of
Ireland. Eastings are on the top/bottom. Northings are on the right/left.
222:
457:
597:
481:
554:
The first figure is the easting and means that the location is 715,830 metres east from the false origin (along the
819:
813:
185:
795:
558:). The second figure is the northing and puts the location 734,697 metres north of the false origin (along the
437:
ITM coordinates on an OSi map from 2006. In this example the easting and the northing are separated by a comma.
152:
99:
461:
250:
270:
32:
488:). The more precise the GPS measurements were, the more the translation process introduced inaccuracies.
600:. Every co-ordinate must be given with at least a six-digit easting and northing from the false origin.
593:
519:
An ITM co-ordinate is generally given as a pair of two six-digit numbers (excluding any digits behind a
413:
330:
80:
503:
and backward compatible with existing mapping. A customised
Transverse Mercator projection was chosen.
889:
532:
320:
290:
230:
180:
106:
957:
638:
543:
469:
142:
90:
962:
892:
Allows conversion between Irish Grid, ITM, UTM & ETRF89. (If registration is required enter:
62:
914:
485:
162:
147:
967:
406:
157:
921:
574:
539:
736:
500:
433:
370:
137:
111:
931:
520:
95:
908:
441:
895:
842:
679:
472:
projection it uses and the fact that it is optimised for the island of
Ireland.
52:
744:
523:
which may be used in very precise surveying). The first number is always the
131:
57:
528:
310:
127:
116:
524:
190:
47:
24:
580:
The ITM co-ordinate for the passive GPS station at the OSi office is:
785:
559:
555:
300:
260:
198:
790:
646:
440:
432:
85:
872:
759:
565:
The equivalent Irish Grid co-ordinate for the same location is:
387:
280:
924:
Click on the ITM button to toggle between Irish Grid and ITM.
867:
531:. The easting and northing are in metres from the false
808:
Ireland’s
Surveying Infrastructure for the 21st Century
596:
letters and truncated coordinates as there is with the
507:
different co-ordinate numbers for any given location.
862:
484:
required GPS measurements to be "translated" (using
460:for Ireland. It was implemented jointly by the
468:(OSNI) in 2001. The name is derived from the
414:
8:
915:Ordnance Survey (UK) Coordinate Converter.
421:
407:
388:Spatial Reference System Identifier (SRID)
383:International Terrestrial Reference System
20:
592:With ITM there is no provision for using
607:
16:Geographic coordinate system for Ireland
573:The Spire of Dublin example provides a
23:
604:Comparison of ITM, Irish Grid and UTM
7:
839:(If registration is required enter:
246:
837:OSi Passive GPS station coordinates
814:A New Coordinate System for Ireland
466:Ordnance Survey of Northern Ireland
393:Universal Transverse Mercator (UTM)
355:European Terrestrial Ref. Sys. 1989
265:Ordnance Survey Great Britain 1936
231:Discrete Global Grid and Geocoding
122:Horizontal position representation
14:
181:Global Nav. Sat. Systems (GNSSs)
31:
826:Coordinate Positioning Strategy
820:New Map Projections for Ireland
810:by William Patrick Prendergast.
345:N. American Vertical Datum 1988
873:Irish Institution of Surveyors
726:200,000m West; 250,000m South
723:600,000m West; 750,000m South
375:Internet link to a point 2010
305:Geodetic Reference System 1980
223:Quasi-Zenith Sat. Sys. (QZSS)
1:
938:Geographic coordinate systems
365:Chinese obfuscated datum 2002
584:E 709885.081m, N 736167.699m
538:The ITM co-ordinate for the
458:geographic coordinate system
315:Geographic point coord. 1983
486:co-ordinate transformations
482:Irish grid reference system
275:Systema Koordinat 1942 goda
984:
899:for the email address and
846:for the email address and
335:World Geodetic System 1984
953:Maps from Ordnance Survey
450:Irish Transverse Mercator
325:North American Datum 1983
295:South American Datum 1969
890:OSi Coordinate Converter
796:Spatial reference system
729:500,000m West; 0m South
186:Global Pos. System (GPS)
153:Spatial reference system
708:53° 30' North; 8° West
705:53° 30' North; 8° West
462:Ordnance Survey Ireland
948:Land surveying systems
711:0° 00' North; 9° West
527:and the second is the
446:
438:
878:OSi: Migrating to ITM
444:
436:
81:Geographical distance
943:Geography of Ireland
920:20 July 2011 at the
909:www.fieldenmaps.info
682:on Central Meridian:
255:Sea Level Datum 1929
107:Geodetic coordinates
639:Reference ellipsoid
491:While the existing
470:Transverse Mercator
285:European Datum 1950
243:Standards (history)
143:Reference ellipsoid
91:Figure of the Earth
905:for the password.)
852:for the password.)
447:
439:
163:Vertical positions
884:Online converters
777:
776:
661:Central Meridian:
431:
430:
379:
378:
158:Spatial relations
148:Satellite geodesy
103:
975:
608:
544:O'Connell Street
423:
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21:
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922:Wayback Machine
859:
832:Map Projections
804:
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540:Spire of Dublin
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857:External links
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737:Vertical Datum
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651:Airy Modified
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569:315904, 234671
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550:715830, 734697
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464:(OSi) and the
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138:Map projection
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112:Geodetic datum
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718:False Origin:
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521:decimal point
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199:BeiDou (BDS)
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100:circumference
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700:True Origin:
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175:Technologies
130: /
42:Fundamentals
18:
749:Malin Head
53:Geodynamics
958:Navigation
932:Categories
802:References
745:Malin Head
693:0.999 600
690:1.000 035
687:0.999 820
622:Irish Grid
598:Irish Grid
480:The older
963:Surveying
501:conformal
456:) is the
132:Longitude
58:Geomatics
918:Archived
902:password
849:password
780:See also
672:9° West
669:8° West
666:8° West
529:northing
515:Examples
311:ISO 6709
209:(Europe)
207:Galileo
193:(Russia)
191:GLONASS
128:Latitude
117:Geodesic
75:Concepts
968:Geodesy
525:easting
476:History
371:Geo URI
341:NAVD 88
251:NGVD 29
225:(Japan)
217:(India)
201:(China)
63:History
48:Geodesy
25:Geodesy
786:ETRS89
773:32629
770:29902
654:GRS80
629:UTM 29
594:myriad
560:Y axis
556:X axis
533:origin
361:GCJ-02
351:ETRS89
331:WGS 84
321:NAD 83
301:GRS 80
261:OSGB36
215:NAVIC
96:radius
791:GRS80
767:2157
762:Code:
680:Scale
647:GRS80
291:SAD69
271:SK-42
86:Geoid
868:OSNI
828:-OSi
822:-OSi
816:-OSi
760:EPSG
546:is:
281:ED50
98:and
863:OSi
615:ITM
589:m.
575:fix
542:on
493:UTM
454:ITM
934::
752:?
562:)
535:.
739::
641::
452:(
422:e
415:t
408:v
102:)
94:(
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