institutions and organisation in our country
makes the adequate use of this recordings even
more difficult:
- The lack of standardisation, and the
incompatibity between existing hard & soft
systems of remote sensing (some of them quite
sophisticated and performant) hinder the
working in multi & interdisciplinary system-so
needed in this domain cannot be achieved:
- So, our reentrance in Europe and in the
World takes real sacrifices from us; but we like
to express our wish and intentions not to lose
touch with the advanced and top technologies.
2. OUR INTEREST AND SPECIFIC
OBJECTIVES
Basic and guiding ideas for treating and solving
complex problems by remote sensing refere to:
(a) establishing the specific strict necessary
needs of users at territorial, regional and local
level, by priorities, hierarchly, by importance
and urgence reasons;
(b) the focusing of interest and efforts on the
terrestrial segment of the chain of remote
sensing processing and generally of the
available systems we have, as well as to reduce
to a minimum point (strictly necessary) of the
number of satellite recordings for the purposed
thematic;
(c) hierarchly use of the ways of data
processing methods and analysis, analogical,
hybrid and digital strictly necessary, with
effective integration of endo and exogene
parameters offering the approach of the
problem their relative or/and absolute
compatibilisation (reference system, calibration
— registration - synergism, etc.);
(d) the technology transfer ways serie directly
to the users is closely and continuously
watched, as step by step this verified and tested
technology can be properly launched;
(e) usually, we achieve the ground sampling
with panchromatic and sometime with colour
IR aerophotogramms due to the very difficult
field condition.
The start of our research begin with the
agreement with NASA (G-27940/1972,
Oprescu a) for natural resources investigation
and monitoring of them, in the lower Basin of
Danube and Danube Delta.
We must mention that, there are many studies in
different zones not specific for remote sensing
which are very usefull for sampling and to
determine the accuracy of the results.
About the test site:
- The Danube Delta is one of Europe’s most
extensive wetlands in a natural state, it forms a
unique series of interrelated ecosystems, with
its large reed beds, maze of with their mosaic of
forests and semi-arid grasslands; the Delta
ecosystems cover about 564.000 ha; of this
442.000 ha lie within Romania;
- The Danube Delta and the coastal zone of
the Black Sea represents areas of high scientific
interest; the Danube Delta represents the
world’s larges surface compactly coveres with
rush (reed); this interest grew becouse the
Danube Delta was declared in 1990 a natural
reservation of the Biosphere.
3. THE METHODOLOGY FOR CONCEI-
VING THIS PROJECT AND IMPLEMEN-
TATION OF THE PROPOSED THEME.
3.1.The Data-base with index recordings.
Now we have a lot of different remote sensing
missions with RADAR or multispectral on-
board sensors. For each of them we know, more
or less, the covering mode. But, for one future
moment, we couldn’t say if it is possible to
obtain a remote sensing recording.
For this reason, we need a Data-base with future
recordings, including all active remote sensing
missions from which we could ask, for a certain
moment, an aero or a satellite remote sensing
recording.
For building a such Data-base we need to
compute the accurate intermediary orbites for
the remote sensing satellite and to establish on
this base, the covering in time, of interested
zones.
In the same time, because the initial orbital
elements are changed, one must obtain the
actual values of them (the Iszac’s elements -
Vinti 1961), by processing astronomical
satellite observations made upon a
determinated number of satellite revolutions.
After computing these satellite orbites, taking
into acount:
= the central point of the remote sensing
image;
= the covered area of the image;
= the time between two succesive recordings;
= the interested zones
we will obtain the remote sensing images that
are possible to record, and if some program ask
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