Topographic mapping in El Salvador is the responsibility of
the Instituto Geográfico Nacional 'Ingeniero Pablo
Guzman' (IGNES), located at Ciudad Delgado. The organization
was founded as the Oficina de Mapa, in 1946.
Modern topographical mapping was carried out in collaboration
with the Inter-American Geodetic Survey (IAGS) from
the early 1950s, following acquisition of a complete
1:40,000-scale air photo cover in 1949 and again in 1954
at scales of 1:30,000 and 1:60,000. The main printed series
is the 1:50,000 scale topographic map in 54 sheets, issued
since 1955. This five-color map is on a Lambert conformal
conical projection, Clarke 1866 ellipsoid, and has a 20 m
contour interval. Sheets each cover an area of 10 minutes of
latitude by 15 minutes of longitude. The first edition was
completed in 1969 and currently all but a few sheets are in
a third edition, based on photography obtained in 1981.
A basic map series at 1:20,000 scale (1:30,000 in mountainous
areas) was also undertaken using the 1954 air
photography, and all 196 sheets were completed in 1969.
These sheets are issued as dye-lines, and have a 10 m contour
interval. Priority is now given to a new basic map of the
country at 1:25,000 scale which is nearing completion in
about 200 sheets, and will supersede the earlier series.
A six-sheet 1:100,000 scale series was published in 1974.
It is on a Lambert conformal conic projection and has a 50 m
Soviet military topographic mapping of El Salvador is available at the following scales: 1:1,000,000 (2 sheets, complete coverage, published 1969-1990);
1:500,000 (3 sheets, complete coverage, published 1985-1988); 1:200,000 (1 sheets, southern coverage, published in 1984) and city (1:10,000 to 1:25,000) topographic
map of San Salvador published in 1980. These products are available in print, digital raster and digital vector GIS formats from East View Geospatial.
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