KONINKLIJKE ACADEMIE VOOR OVERZEESE WETENSCHAPPEN ...

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Anyone more or less familiar with the road network inside the country knows
that it suffers from lack of maintenance (fig. 1). Therefore, it was decided to use
(small and large) airstrips (fig. 2), spread out regularly over the working area, for
the installation of the thirty-five concrete pillars. The choice of airstrips guarantees
not only a “free horizon” required for GPS observations, but also a better
chance of survival for the pillars. In some places, where electrical power supply
was available, these points can then later be upgraded to permanent GPS-
stations. The pillars have as dimensions 0.5 x 0.5 x 1 m and are identified by a
label (fig. 3).
Fig. I . — State of the road network.
Fig. 2. — Use of a small airstrip.