National Grid References

Morden'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


Morden's Hampshire 1695, index grid
General index
Old Hampshire Mapped
Map HMCMS:FA1996.33