British National Grid
Some time ago I published an OSM format file for the British
National Grid, as printed on Ordnance Survey maps.
I have now updated this. There are two main changes:
1. The Way and Node IDs are now well out of the range of Open
Street Map IDs, so the file can be processed simultaneously with
other source files;
2. By omitting roughly 50% of internal nodes, and some
formatting changes, the (uncompressed) file size is reduced from
about 73MB to about 20MB for the same coverage. This has negligible
effect on the final output, since the grid lines are very close to
straight lines over a few kilometres.
This file may be downloaded from http://www.rogercalvert.me.uk/OSM/GBGrid.
Latitude and Longitude
In a similar manner, I have generated a file of lines of Latitude
and Longitude. But since these are world wide, rather than limited
to Great Britain, I have put a generator on line at http://www.rogercalvert.me.uk/OSM/LatLong.
A file will be generated in real time and downloaded for any
(sensible) range of coordinates. For performance reasons, I have
limited the download size to 10MB (which is enough to cover mainland
Great Britain), but several downloads may be used to cover a larger
region.
Please let me know of any problems you encounter in accessing or
using these.
Roger
--
Roger Calvert