The Channel Islands are a self-governing territory under the
British Crown. The British Ordnance Survey (OS) has
made a large contribution to the mapping of the islands,
but they are nearer to France than mainland Britain, are not
covered by the National Grid and have their own mapping
agencies. Several commercial survey companies have also
been involved in official mapping, resulting in a varied range
of topographic and tourist maps, with specifications differing
from island to island.
The smaller scale mapping of Jersey has evolved from a two
inches to the mile (1:31,680) map first published by the
Ordnance Survey office at Southampton in 1914, and based
upon survey by the Royal Engineers the previous year. This
map was used as a base for revision by BKS Surveys Ltd
(BKS) in 1960, when it acquired the title Official map of
Jersey. BKS also produced a larger format map at 1:15,840
scale in the same year. Subsequently, other private mapping
companies have provided official and unofficial tourist maps
of the island. Hunting Surveys remapped the island to
produce a new official map at 1:25,000 and a simpler
1:50,000 road map, with a street map of St. Helier on the
reverse. This appears as a military edition in the (M824 Series)
dated 1969, and was last revised in its civilian version in
1975. It has 25 ft contours and layer coloured relief, and is
on the UTM projection with UTM grid. The compilation
was from 1:2,500 scale surveys and 1965 air photography.
OS were commissioned by the States of Jersey in 1980 to
update the island's mapping. The basic map is at 1:1,000
scale, with 209 sheets needed to cover the island. There is
also a series at 1:2,500 (45 sheets) and 1:5,000 (14 sheets).
The latter is contoured at 10 m intervals. All these maps
are in monochrome and are available as diazo paper prints
or as transparencies. Following a study of digital map
requirements, all the 1:2,500 scale mapping was digitized
by Ordnance Survey to the Land-Line.93 Plus specification,
and in 1994 the States of Jersey purchased a Laser-Scan
Horizon map management system for using the digital data
in a GIS environment. The current single-sheet map,
published in 1982, and reprinted with minor revisions in
1988, was compiled from air photography flown in 1979
and 1980 and has a contour interval of 20 ft.
Guernsey has a similar history of OS mapping. The island was
surveyed in 1898-99 at 1:2,500 scale (in 26 sheets) and at six
inches to the mile, and this survey formed the basis for many
subsequent maps. For example, OS updated the mapping in
1938, and a further update was made in 1962-3 by BKS
Surveys, together with enlargement of 1:2,500 sheets to
1:1,250 for St. Peter Port. Contours at 10 ft intervals were
added at this time. Further revisions by BKS took place in
1979, while OS updated the St. Peter Port sheets in 1988.
There is also a number of 1:500 scale plans produced by specialist
companies using aerial photogrammetry. The Department
of Engineering of the States Board of Administration
plan to follow Jersey in digitizing the large scale map archive.
Development plans have been produced by the States of
Guernsey Island Development Committee. Seven of these
cover the island and show planning zones on a 1:5,000 scale OS
base. A Guernsey leisure map at three inches to one mile was
published in 1974 by BKS Surveys, derived from the earlier
OS map at the same scale. It was in four colors with 25 ft
contours, was on the Transverse Mercator projection with
UTM grid and included an inset street map of St. Peter Port.
The most recent general map of this island is in the military
(M824 Series) and at the scale of 1:25,000. It was revised in
1985 and published in 1986 on a Transverse Mercator projection
with UTM grid and has 10 m contours.
The smaller islands of the Channel Islands are all available
as military edition maps published by Military Survey as
part of the (M824 Series). Their scales and sheet dimensions
vary, reflecting the differing sizes of the islands. Alderney is
covered by a six inches to the mile (1:10,560) military map
published in 1966. It is printed in three colors with 10 ft
contour interval. The projection is Universal Transverse
Mercator, as is the grid. This map was prepared and drawn
by OS from 1:2,500 and 1:1,250 surveys made a decade
earlier. OS revised the large scale mapping of Guernsey in
1987, and the whole island is available in 14 sheets at
1:2,500, while the town of St. Anne is covered by 1:1,250
scale mapping. A new colorful tourist map at 1:10,560 was
published by OS for the States of Alderney in 1988. This
is an enhanced and updated version of the military map,
with the sea colored blue and the land area a pale green.
The military map of Sark is also at six inches to the mile
(1:10,560), and was published in 1965, having been
compiled from air photography flown the previous year, and
revised in 1992. This is a six-color map with UTM grid
and latitude and longitude given at the corners of the sheet.
The contour interval varies, being at 50 ft below 200 ft,
20 ft between 200 ft and 300 ft, and 10 ft thereafter. Herm
and Jethou appear together on a single 1:10,000 sheet in
the (M824) map series. This sheet was compiled from 1962
air photography and was published in 1969. Printing is in
four colors, projection is UTM, with UTM grid, and there
is a 5 m contour interval.
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