Gaps between tiles of OS Terrain 50 and Terrain 5 DTM data


Why are there small gaps between some of the adjacent tiles of OS Terrain 50 and OS Terrain 5 DTM data? The edges of the tiles should all match up perfectly.


1 answer

In the latest version of Terrain 50 DTM (July 2016) Ordnance Survey have advised that there are 58 tiles that have coordinate errors in their headers which cause the affected tiles to be offset by a few metres when viewing them in GIS. Ordnance Survey are working on a fix to the problem and are hopeful it will be resolved in time for the next release of Terrain 50 DTM (due in July). Further information can be found on the following Ordnance Survey web page:
A similar problem exists for some tiles in OS Terrain 5 DTM, although as yet it’s not clear how many tiles are affected. Ordnance Survey are aware and are working on a fix for the affected tiles. The issue affects the last two releases of OS Terrain 5 (October 2016 and January 2017).
We will update this Q&A when we have further information from Ordnance Survey. In the mean time if you discover gaps between adjacent tiles of either OS Terrain 50 DTM or OS Terrain 5 DTM we recommend you download a previous version of the data.
Please contact if you have any further questions.


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