Yemen comprises the former Yemen Arab Republic (YAR)
and its southern neighbour the People's Democratic
Republic of Yemen, as well as the island of Socotra, which
merged to form Yemen in May 1990. The national mapping
agency of the new state is the former national agency of the
YAR, the Survey Authority (YSA) in Sana'a, but mapping
systems of the two parts of the new nation continue to reflect
YSA was set up with Swiss aid and became an autonomous
organization in 1982 when it moved to new headquarters.
British aid programs established the first modern
photogrammetric mapping in the former YAR. A 1:50,000
scale map was started by the Directorate of Overseas Surveys (DOS)
(now Ordnance Survey International (OSI)) and YSA in
the southwest of the country and later extended to provide
basic scale mapping of most of the YAR in 171 sheets. The
first sheets were published in 1979, and parallel English and
Arabic language versions of this map were issued, as the
series came to be extended to most of the country. This map
is on the UTM projection, WGS 1972 ellipsoid, and shows
relief with 20 m contours. Derived 1:100,000 scale coverage was
also issued for some areas. Unmapped desert areas of the
YAR were covered by OSI at 1:100,000 scale in a bilingual
map early in the 1990s. This mapping was derived from
SPOT satellite imagery, shows relief with 40 m contours
(20 m in flatter areas) and depicts place names collected in
the field. An eight-sheet 1:250,000 map was also produced,
with relief shown by hypsometric tints and 100 m contours.
South Yemen was also mapped by British authorities, but
surveys were carried out prior to independence, and maps
were compiled by the British Directorate of Military Survey.
Parts of the British Protectorate of Aden were covered in a
1:100,000 scale photomap series on the UTM projection,
Clarke 1800 ellipsoid. Socotra was mapped in the 1970s by
the British Royal Geographical Society (RGS) in a
1:125,000 scale topographic map with relief at 100 m intervals.
Soviet military topographic mapping is the best available coverage of Yemen, it exists at the following scales: 1:1,000,000 (8 sheets, complete coverage, published 1980-1983);
1:500,000 (18 sheets, complete coverage, published 1979-1981); 1:200,000 (91 sheets, complete coverage, published 1978-1980); 1:100,000 (244 sheets, complete coverage,
published 1978-1986) and city (1:10,000 to 1:25,000) topographic mapping of Aden and Sana'a published between 1975 and 1978. These products are available in print, digital raster
and digital vector GIS formats from East View Geospatial.
Copyright © 2014 East View Geospatial, Inc.