National Grid ReferencesMorden's Hampshire 1695 | ||
NGRs | Simple mathematics was used to crudely superimpose the national
grid on Morden's map. The difference between the map projections
used by the NGR system and used Robert Morden has been ignored.
'Centres' of the the old and the Ordnance Survey maps of the county
were superimposed at an average position of twenty or so prominent
towns; the orientations and scales were matched by averaging the
directions and distances of these places from the centres on each
map; it is then possible to draw the NGR from the modern map upon
the image of the old. The calculations were done by a computer
using a program written by MN, OLDMAPS.exe; fuller notes about the
process are provided in the software notes, OLDMAPS.rul. File MORDEN2.pts has readings of positions of recognisable places on the old map, using (x,y) coordinates on the old map. | |
Points file |
@pl Alton @ngr SU717396 @xy (30.11,26.39) @pl Basingstoke @ngr SU634527 @xy (26.43,30.40) @pl Winchester @ngr SU478293 @xy (20.20,19.50) @pl Andover @ngr SU365458 @xy (15.76,25.64) @pl Lymington @ngr SZ322954 @xy (15.31,5.02) @pl Romsey @ngr SU351212 @xy (16.72,15.76) @pl Fareham @ngr SU575061 @xy (25.95,11.42) @pl Stockbridge @ngr SU355351 @xy (15.61,21.05) @pl Petersfield @ngr SU744235 @xy (30.90,19.50) @pl Havant @ngr SU717062 @xy (31.29,11.38) @pl Odiham @ngr SU740509 @xy (30.24,30.59) @pl Christchurch @ngr SZ159925 @xy (9.19,2.07) @pl Kingsclere @ngr SU525586 @xy (21.74,32.25) @pl Whitchurch @ngr SU460478 @xy (19.23,28.37) @pl Fordingbridge @ngr SU150145 @xy (9.21,11.30) @pl Bradley @ngr SU635418 @xy (26.58,27.08) @pl Tangley @ngr SU334524 @xy (13.41,28.28) @pl Grately @ngr SU275420 @xy (10.96,22.72) @pl Buriton @ngr SU740200 @xy (30.67,17.79) @pl Burghclere @ngr SU469610 @xy (19.19,31.94) @w 41.89 @h 36.40 @sc 8.14 @m 10 @sc 7.43 @m 10 The results from OLDMAPS.exe are given in file: MORDEN2.ngr: Output from OLDMAPS.exe, using MORDEN2.pts Map morden2 Data file: morden2.pts Output file: morden2.ngr OLDMAPS Plotting a NGR grid on an old map version 3.5 MN: 12.6.1996 Given points no place ngr (x,y) 1 Alton SU717396 ( 30.11, 26.39) 2 Basingstoke SU634527 ( 26.43, 30.40) 3 Winchester SU478293 ( 20.20, 19.50) 4 Andover SU365458 ( 15.76, 25.64) 5 Lymington SZ322954 ( 15.31, 5.02) 6 Romsey SU351212 ( 16.72, 15.76) 7 Fareham SU575061 ( 25.95, 11.42) 8 Stockbridge SU355351 ( 15.61, 21.05) 9 Petersfield SU744235 ( 30.90, 19.50) 10 Havant SU717062 ( 31.29, 11.38) 11 Odiham SU740509 ( 30.24, 30.59) 12 Christchurch SZ159925 ( 9.19, 2.07) 13 Kingsclere SU525586 ( 21.74, 32.25) 14 Whitchurch SU460478 ( 19.23, 28.37) 15 Fordingbridge SU150145 ( 9.21, 11.30) 16 Bradley SU635418 ( 26.58, 27.08) 17 Tangley SU334524 ( 13.41, 28.28) 18 Grately SU275420 ( 10.96, 22.72) 19 Buriton SU740200 ( 30.67, 17.79) 20 Burghclere SU469610 ( 19.19, 31.94) number of points = 20 Centroids of points (x,y) centroid is ( 20.93, 20.92) NGR centroid is SU487318 numerical ngr 448.73 131.82 Map scale scale = 2.27 scale = 2.33 scale = 2.65 scale = 2.37 scale = 2.59 scale = 2.53 scale = 2.68 scale = 2.44 scale = 2.36 scale = 2.31 scale = 2.12 scale = 2.50 scale = 2.13 scale = 2.44 scale = 2.32 scale = 2.73 scale = 2.62 map scale 1 to 243541 or 1 to 243000 Map heading Map heading NGR north on map is 8.5 degrees W of map north Check points no place ngr map 1 Alton SU717396 SU728416 2 Basingstoke SU634527 SU653526 3 Winchester SU478293 SU464286 4 Andover SU365458 SU379450 5 Lymington SZ322954 SZ294955 6 Romsey SU351212 SU367209 7 Fareham SU575061 SU573071 8 Stockbridge SU355351 SU359340 9 Petersfield SU744235 SU722247 10 Havant SU717062 SU702050 11 Odiham SU740509 SU746517 12 Christchurch SZ159925 SZ136906 13 Kingsclere SU525586 SU547588 14 Whitchurch SU460478 SU473503 15 Fordingbridge SU150145 SU170128 16 Bradley SU635418 SU645446 17 Tangley SU334524 SU332522 18 Grately SU275420 SU253397 19 Buriton SU740200 SU710207 20 Burghclere SU469610 SU485589 Map sheet corners bottom left SY907890 top left SU039766 top right TQ047615 bottom right SZ916738 Grid lines x positions on bottom and top edges, y positions on left and right edges, by which to draw lines on map easting grid lines Eing bottom edge top edge 400 3.85 1.62 410 8.00 2.53 420 12.15 6.68 430 16.30 10.83 440 20.46 14.99 450 24.61 19.14 460 28.76 23.29 470 32.91 27.44 480 37.07 31.59 490 41.22 35.75 500 45.37 39.90 510 49.52 44.05 northing grid lines Ning left edge right edge 80 3.74 2.56 90 0.41 6.71 100 4.56 10.86 110 8.72 15.01 120 12.87 19.16 130 17.02 23.32 140 21.17 27.47 150 25.32 31.62 160 29.48 35.77 170 33.63 39.93 180 37.78 44.08 Scale line scale line length 8.14 cm representing 10 miles scale 1 to 197708 scale line length 7.43 cm representing 10 miles scale 1 to 216601 |
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