Monday, 7 December 2015

arcgis desktop - Are British National Grid (BNG) 1km grid shapefiles displayed accurately in ArcMap?


I have downloaded the UK Ordinance Survey's 1km grids in shapefile format for ArcMap.



If you need to download them to have a look first you can find them here look for link in the first Answer to the Question Ordnance Survey grids - download or generate?.


They 'supposedly' represent 1km grids however here is where the first problem begins. If I calculate their dimensions and areas in ArcMap their size differ from one another. How is this possible are they not supposed to be regularly spaced every 1km?


The second problem I encounter is - of course as a result of the first problem - that if I try to divide the areas into smaller sections they grid would now shift slightly to one side.


Can you please advise if there is a way to solve this problem and/or if you get the same results?




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