International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004
perform a sample-test, with annotations taken on the field,
directly on the prints.
1999 DIGITAL CARTOGRAPHY
The construction of a geometrical data-base, updated and
structured in conformity to recent methodologies, appears
indispensable right from the first design anticipations of the
present study. Indeed the mentioned material, even if
extremely interesting for comparative historical studies and
analyses, seems insufficient as a base for a study concerning
such a huge territory, composed of large areas undergoing
profound transformations.
Fig.4. Overlay of Corine LC 1991 and 2001 forest data set.
It proved necessary to build a data structure compatible with
the operations of a GIS environment, suitable both for
interrogations formulated during the production of the
Territorial Plan and for the management of those same areas
in subsequent times (ie. production of the National Park
plan).
The choice of the representation scale, expression
erroneously flexible in the face of digital geometrical data-
bases, was done as the right compromise between the level of
detail required for metrical and photo-interpretative analysis
and the cost deriving from the requirements expressed from
the client public Agencies.
The photo coverage, photo-scale of 1:22.000 on B/W film,
was made in August 1999,
Fig.5. Land Use coverage in province of Bari.
[t was also produced a complete digitalization of the acquired
aerial photos by mean of a photogrammetric scanner, directly
from the B/W negative film, with a resolution of 1270dp!
366
(equal to a pixel dimension of 20 um). Such files can be
utilised for the production of digital orthophotos up to a scale
of 1:5.000, with the ground resolution of about 0.40m.
MAP THEMATIC LAYERS
The adopted methodologies and procedures refer to the
detailed field survey, consisting of paper drawing and GPS
positioning, as well as the indoor digitalisation of
information.
The data elaborations realised and organised have been
mainly those of the forests, geo-pedological and land use
study-groups, and have provided a thematic cartographic
base of remarkable value for the subsequent investigations.
Fig.6. Multi-temporal spatial analysis on forest data set in
overlay on 1997 digital orthophoto. The solid line area refers
to Corine LC 1991, the dashed refers to 1997 orthophoto.
SPATIAL ANALYSIS IN LAND USE AND
AGRICULTURAL TRANSFORMATIONS
The present land-use analyses, traditionally divided in the
study of land-cover and land-use, are strongly influenced by
the requirements of the storage of digital data, and often
show the inability of being temporally and geometrically
correlated, together with the scarce temporal reliability of
such topographical data-bases.
The classification and the preservation of natural resources,
however, requires an information detail which is only
attainable with a resolving power below | metre and the
demand of cartographic bases with such a resolution is
steadily growing among the experts of the sector which are
not satisfied with the interpretations produced by the
photogrammetrist or the “cartographer”.
On the basis of such considerations the construction of the
polygons relating to land-use was the responsibility of two
groups of experts, one concentrated on the use for farming,
the other on the use as pasture. The proposed methodology
consisted of the photo-interpretation on a ortho-
photographical base, validated by a large series of field
investigations.
The results of the two groups show a small percentage of
overlapping of the evaluations, as evidence of the fact that
the refining of survey methods always leads to the variability
of the interpretative estimate. It is indeed not possible to
assert that the real-world phenomena are precisely definable
from a geographical as well as a qualitative point of view; to
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