The grid-squares used for Census purposes uses this grid reference to refer to the area enclosed by a square projected from that grid reference by the distance that the resolution of the grid reference dictates. The grid reference of the City Hall is thus J 33 74 to a 1km resolution and J 338 740 to a 100m resolution. The distance from the southwest corner of square J is 33 831 metres east and 74 015 metres north. The numbers can vary in numbers of digits depending upon the resolution of the grid reference.įor example: Belfast City Hall has an easting 333831 and northing 374015 which means it is 333831 metres east and 374015 metres north of the bottom southwest corner. The remaining numbers represent a point within that 100 kilometre square by giving the distance east and north from the bottom southwest corner of the square. The letter designates one of the twenty 100 kilometre squares that cover Ireland, as shown by the map above. Grid Square references are made up of a combination of the easting and northing and consist of a letter and an even number of digits. The area of Ireland is divided into 20 squares, measuring 100km by 100km, each identified by a single letter. Grid Squares are zero referenced at the far southwest of Ireland and both the easting and northing are calibrated in metres. The first, called the easting, is an east to west line that runs parallel to the central meridian while the second, called the northing, runs at right angles to it. Grid Squares are made up of a system of squares defined by two lines at right angles to each other. Geoareaha: Area in hectares of grid square.HH01: Household count for grid square (2001 Census).Pers01: Population count for grid square (2001 Census).Northing: Geographic coordinate for northing.Easting: Geographic coordinate for easting.The attribute table of the combined grid square product contains the following variables:
More information on how the Combined Grid Square product was created is available below. Population and household counts are provided at a 100 metre grid resolution for settlements with a population of greater than 1000 using Settlement Development Limits (SDLs) as defined by the Planning Service. The Combined Grid Square product provides basic 2001 Census statistics for population and household counts for a combination of 1km and 100 metre grid squares in Northern Ireland.
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