Grid text files provide a matrix of values covering the whole of the UK, in one file for each day, month or year. Each value represents an estimate for the centre point of a 5 x 5 km grid cell.
These grid cells are identified using the Ordnance Survey National Grid, extended to cover Northern Ireland. The area covered is shown in this map, with climate variable values for all land areas coloured green and -9999 elsewhere.
The data are preceded by six header rows constructed as follows.
The matrix of values follows, arranged to reflect the natural geography of the UK when presented on screen or paper, i.e. the values in each row run from west to east (reading from left to right) and the rows are ordered from north to south (reading from top to bottom), in steps equal to the grid cell size. The data are presented as space-delimited values.
Note: The format of the grid text files is the same as that used by ESRI GIS software (e.g. ArcView) to import/export gridded data as plain text. Users of such software can import the files without modification.
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