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Title
Modern trends of education in photogrammetry & remote sensing

57
that this gathering of data represents probably about 90% of the
effort and cost of a land information system. This shows the
result of letting computer experts and geographers get the upper
hand in this field. Unfortunately they do not understand the
basic requirements of surveying and mapping. They are assuming
that the "data" is somehow available. They are also not aware
of the fundamental principle ruling surveying and mapping
operations which states that "smaller scale" products can be
derived from the " larcrer scale“ data but not vice versa.
Therefore, since one can not avoid relatively precise and
detailed measuring operations in the field or by using
photogrammetry, the proper and only economic solution in the age
of computers is to carry out tnese measurements correctly, and
then derive smaller seale and generalized products from them by
the use of computers. Ev doing so, the precise up-to-date
terrain data would be available whenever required. Delays,
duplications and blunders would be eliminated and the savings
'would be enormous. Moreover, a needed base would be created for
the acquisition and efficient use of other data such a.s that
provided by remote sensing techniques.
To keep the various surveying and mapping techniques in a
natural operational structure, it is not sufficient to rename
societies and their journals. One must formulate new operational
principles and rational specifications including alternative
measures that permit the use of photogrammetry. After all, it
is the only technique capable of solving without delay the
pressing problems in the field under discussion. The guiding
factors must be the actual requirements of society at larcre and
not the vanity or commercial interests of various groups.
Photogrammetry, because of its wide range of applications and
singular efficiency, forms an obvious base for such a
comprehensive and integrated land information system. Such a
system is urgently needed in all countries, but in particular in
developing countries. They do not have the time or resources to
enjoy the "luxury" of obsolete schemes.
In order to achieve this goal some organized effort on our
side is required. First of all, we should ask ourselves the
basic question: Are we satisfied with the present state of
surveying and mapping in the world, and do we really think we
have carried out cur responsibility in this field? If the answer
in "No", we should then ask ourselves, "How did this happen?".
We know mat pcwerrul and economic facilities are provided by
photogrammetry; why the lack of progress?
Secondly, if we. are concerned enough not to be satisfied
with the present situation, we should remind national and
international institutions that as far back as 1972 the UN
Secretary General appointed an Ad Hoc Group of Experts * that
subsequently issued a report entitled ,, Medium-Scaie”and Large-
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