National Grid References

Norden's Hampshire 1607
NGRs Simple mathematics was used to crudely superimpose the national grid on Norden's map. The difference between the map projections used by the NGR system and used John Norden 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 NORDEN1.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 (24.15,21.11)
@pl Basingstoke @ngr SU634527 @xy (21.38,24.20)
@pl Winchester @ngr SU478293 @xy (16.06,15.49)
@pl Andover @ngr SU365458 @xy (12.55,20.40)
@pl Lymington @ngr SZ322954 @xy (12.28,4.00)
@pl Romsey @ngr SU351212 @xy (13.30,12.60)
@pl Fareham @ngr SU575061 @xy (20.88,8.89)
@pl Stockbridge @ngr SU355351 @xy (12.57,16.84)
@pl Petersfield @ngr SU744235 @xy (24.90,13.58)
@pl Havant @ngr SU717062 @xy (24.90,8.97)
@pl Odiham @ngr SU740509 @xy (23.66,24.41)
@pl Christchurch @ngr SZ159925 @xy (7.11,1.37)
@pl Kingsclere @ngr SU525586 @xy (17.56,25.60)
@pl Overton @ngr SU514500 @xy (16.96,22.95)
@pl Fordingbridge @ngr SU150145 @xy (7.19,8.87)
@pl Titchfield @ngr SU541058 @xy (19.30,8.13)
@pl Hambledon @ngr SU646151 @xy (21.94,12.36)
@pl Grately @ngr SU275420 @xy (8.62,18.29)
@pl Nether Wallop @ngr SU304364 @xy (9.59,16.86)
@pl Buriton @ngr SU740200 @xy (24.80,14.21)
@pl Hawkley @ngr SU746291 @xy (25.19,17.74)
@pl Burghclere @ngr SU469610 @xy (15.30,25.46)

@w 32.10 @h 29.28

@sc 6.61 @m 10
The results from OLDMAPS.exe are given in file: NORDEN1.ngr:
Output from OLDMAPS.exe, using NORDEN1.pts


Map Norden1

  Data file: Norden1.pts
Output file: Norden1.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    (   24.15,   21.11)
  2  Basingstoke              SU634527    (   21.38,   24.20)
  3  Winchester               SU478293    (   16.06,   15.49)
  4  Andover                  SU365458    (   12.55,   20.40)
  5  Lymington                SZ322954    (   12.28,    4.00)
  6  Romsey                   SU351212    (   13.30,   12.60)
  7  Fareham                  SU575061    (   20.88,    8.89)
  8  Stockbridge              SU355351    (   12.57,   16.84)
  9  Petersfield              SU744235    (   24.90,   13.58)
 10  Havant                   SU717062    (   24.90,    8.97)
 11  Odiham                   SU740509    (   23.66,   24.41)
 12  Christchurch             SZ159925    (    7.11,    1.37)
 13  Kingsclere               SU525586    (   17.56,   25.60)
 14  Overton                  SU514500    (   16.96,   22.95)
 15  Fordingbridge            SU150145    (    7.19,    8.87)
 16  Titchfield               SU541058    (   19.30,    8.13)
 17  Hambledon                SU646151    (   21.94,   12.36)
 18  Grately                  SU275420    (    8.62,   18.29)
 19  Nether Wallop            SU304364    (    9.59,   16.86)
 20  Buriton                  SU740200    (   24.80,   14.21)
 21  Hawkley                  SU746291    (   25.19,   17.74)
 22  Burghclere               SU469610    (   15.30,   25.46)
number of points = 22


Centroids of points

(x,y) centroid is  (   17.28,   15.56)
  NGR centroid is  SU503286
    numerical ngr  450.30 128.67


Map scale

scale =     2.72
scale =     2.86
scale =     3.25
scale =     3.01
scale =     3.41
scale =     3.13
scale =     3.31
scale =     3.13
scale =     3.08
scale =     2.98
scale =     2.86
scale =     3.14
scale =     3.01
scale =     3.49
scale =     2.91
scale =     2.74
scale =     3.30
scale =     2.96
scale =     3.22

map scale  1 to   307928
or         1 to   307000


Map heading

Map heading
NGR north on map is 8.2 degrees W of map north


Check points

 no  place                    ngr         map

  1  Alton                    SU717396    SU736425
  2  Basingstoke              SU634527    SU666531
  3  Winchester               SU478293    SU465289
  4  Andover                  SU365458    SU380455
  5  Lymington                SZ322954    SZ299956
  6  Romsey                   SU351212    SU368214
  7  Fareham                  SU575061    SU583067
  8  Stockbridge              SU355351    SU365346
  9  Petersfield              SU744235    SU726192
 10  Havant                   SU717062    SU706052
 11  Odiham                   SU740509    SU736528
 12  Christchurch             SZ159925    SZ130899
 13  Kingsclere               SU525586    SU555591
 14  Overton                  SU514500    SU525513
 15  Fordingbridge            SU150145    SU166127
 16  Titchfield               SU541058    SU531051
 17  Hambledon                SU646151    SU630168
 18  Grately                  SU275420    SU251408
 19  Nether Wallop            SU304364    SU274360
 20  Buriton                  SU740200    SU726212
 21  Hawkley                  SU746291    SU753318
 22  Burghclere               SU469610    SU486597


Map sheet corners

 bottom left SY907888
    top left SU036781
   top right TQ015639
bottom right SZ886747


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          3.03          1.21
 410          6.31           2.07
 420          9.59           5.35
 430         12.87           8.63
 440         16.15          11.92
 450         19.43          15.20
 460         22.71          18.48
 470         26.00          21.76
 480         29.28          25.04
 490         32.56          28.32
 500         35.84          31.60
 510         39.12          34.88

northing grid lines

Ning      left edge      right edge
  80         2.91           1.73
  90          0.37           5.01
 100          3.65           8.30
 110          6.93          11.58
 120         10.21          14.86
 130         13.50          18.14
 140         16.78          21.42
 150         20.06          24.70
 160         23.34          27.98
 170         26.62          31.27
 180         29.90          34.55


Scale line

scale line length     6.61 cm
representing   10 miles
scale 1 to   243471


Norden's Hampshire 1607, index grid
General index
Old Hampshire Mapped
Map HMCMS:FA1996.22