SABRE Maps/OSNI One Inch

SABRE Maps Coverage projects
Location Map ( geo)



	Pictures related to SABRE Maps View gallery (46)
Quick Links
Coverage Projects overview Fifth Edition • New Popular Edition • Popular Edition • Scottish Popular • Seventh Series • Landranger • Half Inch • Ministry of Transport • Quarter Inch • Ten Mile & Route Planning • OSNI One Inch • 1:25k First Series
Related Terms
SABRE Maps Co-ordinate Finder • Sheetfinder Online Grid Calibrator Adding maps in depth Map layer names • Georeferencing

This SABRE Maps Coverage Project is to provide online coverage of the Ordnance Survey Northern Ireland One Inch Popular Edition and Third Series maps.

Whilst as the publisher might suggest the two series are primarily based around Northern Ireland, due to its shape any rectangular map series also takes in parts of the Republic of Ireland.

The One Inch scale of OSNI lasted longer than that of OSGB, so there are quite a number of sheets still in copyright as at 2021.

Which projection type are these maps?

See Also: SABRE Maps/Calibrating

The two series use different projections, with the OSNI One Inch Third Series using the Irish Grid.

However, the Popular Edition uses the Bonne (Ireland) projection, but in a similar manner to the Scottish Popular Edition, later sheets have the Irish Grid printed across them. As the Irish Bonne and Irish Grid are not obviously skewed to one another to the naked eye, it is easy to choose the incorrect projection type for the mapping.

How do I find out the date of the map?

See Also: SABRE Maps/OS Copyright

OSNI revision codes, such as 4389 in this example, are not to be trusted for dating purposes

Example of printing date on an OSNI One Inch Popular map, in this case 1958 is the relevant date

If there are multiple printing dates, then the latest one takes precedence, 1971 in this example

For those of us more familiar with OS Great Britain's series of revision codes changing with every printing, OSNI revision codes on the two One Inch series are easy to be caught out by.

The codes themselves are allocations on the short-lived OSGB unique revision codes in use during the late 1940s and early 1950s, where every map revision had a new code printed on it. However, in OSNI usage, the revision code simply indicates the map sheet, and does not change with each update. As an example, all the different revisions of Third Series Sheet 2 carry the single revision code of 4275, located in the margin at the bottom left of the map.

Instead, we need to do the very thing that we need to avoid on OSGB mapping, and look at the date of printing given, which is contained after the phrase Printed at Ordnance Survey Office or Reprinted with amendments, with the latest date given taking precedence.

Progress by every sheet ever printed

Unfortunately there does not appear to be a full published cartobibliography of the various OSNI One Inch series, and so this table will necessarily not include every revision.

Key

Available on SABRE Maps

Online, but needs replacement source

Unconfirmed Revision

Within the pipeline

Pipeline
(Military edition)

Acquired but not scanned

Copy needed

In copyright
(copy available)

In copyright
(copy needed)

No map printed
(or empty cell)

Popular Edition

Sheet	Name	1938	1949	1950	1952	1953	1954	1956	1958
1	North Derry
2	North Antrim	3389/A					3389/A
3	Londonderry and The Sperrins
4	Mid Antrim
5	West Tyrone
6	East Tyrone		3284
7	Belfast					8000/9/53
8	Fermanagh
9	Armagh
10	Mid-Down				3391^[1]			4041
11	Mourne Mountains			3287					4167

Notes

↑ Sheet 10 revision 3391 has an indicated "Printed by" date of 1938, and a MV date of 1937, but is partually of Specification E with the Irish Grid marked by margin ticks only, but no "Provisional Edition" wording, suggesting somewhere between 1948 and 1953. This agrees with the "unique number" print code", which suggests somewhere around 1952 - hence it is shown on the 1952 layer until more detailed information comes to light.