boundaries of the city, the various harbour basins and their names were marked. This
small map became in great demand, particularly for the illustration of journals and
periodicals.
As a result of the considerable extension of the port area by the execution of the
Europoort (Europe-gate)plan, by which the whole Isle of Rozenburg and the reclaimed
and raised Maasvlakte (former mouth of the river Rhine) became part of the
Rotterdam port area, the need of a larger map on a topographic base became
apparent. The simple black-and-white outline-map was discarded and a new map was
designed, based on topographic maps. The Scale was reduced to 1 75 000, the size
enlarged to 20 x 55 cm. Because of the increased need for more information on the
map, lt was decided to have it executed in colours; the technical realization was
commissioned to the Cartographic Section of the Municipal Public Works Department.
By using colours it became possible to represent different stages of planning and to
difterentiate turther the infrastructure; besides, the map got a more attractive look.
Nineteenhundred and sixty was the first year in which the Rotterdam-Europoort map
appeared according to this new design; the number of copies printed that year was six
thousand.
Düring the first couple of years the map was printed in 5 colours; red, blue, yellow,
grey and black. By using area Symbols the following forms of land-use could be
distinguished: built-up area, industrial and harbour areas, and the planned extensions
of both; farmland, dunes, woods or parks, and hothouses. About 1968 the colour
green was added as a separate printing colour and by using screens five depth-zones
were distinguished in the North Sea and adjacent waters. A road-classification was
included and even the radar stations along the Nieuwe Waterweg were mapped. The
size of the map was extended to 24 x 67 cm. Early in 1970 the conditions for the
publication of a new edition were Optimum: the size was enlarged again, now to 28 x
82 cm, the scale to 1 70 000 and printing was done with 10 colours! By using all
these extra-colours it became possible to distinguish even between the various
functions of the industrial and urban areas and between the various aspects of the
recreation areas. The third edition of 1971, a copy of which has been added to this
issue of 'Kartografie', reflects the economic circumstances: its appearance has been
slightly simplified. The number of printing colours has been reduced to six, the size to
25 x 70 cm and the scale to 1 80 000. In 1971 the number of copies printed in the
three editions amounted to 100 000.
BRINGING THE MAP UP TO DATE
On the map new development plans are plotted. These plans are greatly subject to
changes, and therefore the number of copies of each edition is limited. This makes it
feasible, whenever a modification arises in the present Situation of the harbours, or in a
development plan, or in the list of applicants for industrial areas, to introduce the new
Situation rapidly on a new edition of the map, without getting stuck with large
quantities of obsolete maps. Compared with the previous edition of the Rotterdam/
Europoort map, the enclosed map shows, for instance, the following changes: the just
finished new entrance to the Maasvlakte-harbours, new isobaths in the sea (their
location was altered by changes in the sea-currents, caused by the execution of
EXECUTION
296 K.N.A.G. Geografisch Tijdschrift VI 11972) Nr. 3
