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Cassinis, R.

Tonelli, A. M.

English

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E75- 10.1.3.2
CONSICLIO NAZIONALE DELLE RICERCHE c2 /2
LABORATORIO PER LA GEOFISICA DELLA LITOSFERA
20131 MILANO .... e.e...... ..! ..974
Postw: GEOLAB. Via Mario Bianco. 9
Telelono (02) 2840227 - 2899905
SKYLAB FIFTH PROGRESS REPORT''-. .
Fractures and lineaments of
Sicily island . 519
Preliminary results on analoa
optical techniaues
"Made available under NASA sponsorship
in the intorest of early and wide dis-
semination of Earth Resources Survey
Program information and without liability
for any use made thereo'
Principal Investigator : R. Cassinis
Written by : A.M.Tonelli -Co-Investicator
/(E75-10132) FRACT U R E S AND LINEAMENTS OF 
N75-16951
SICILY- ISLAND: PRELIMINARY RESULTS ON
ANALOG OPTICAL TECHNIQUES Progress Report
(Consiglio Nazionale delle Ricerche, Mila ) Unclas7 P HC $3.25_ _ CSCL 08E G3/43 0132
https://ntrs.nasa.gov/search.jsp?R=19750008879 2020-03-22T22:55:48+00:00Z
C. N. R.
LAB. PER LA GEOFISICA DELLA LITOSFERA Foglo N
In the framework of the studies carried out with
the aid of the Skylab images an additional topic of
investigation is the geological structure of Sicily
outside the volcanic area.
On the occasion of the ESRO meeting held at Frascati
(Jan.28, 1974) the first results by ERTS-1 imagery
were presented (ref.: 1 ).
At the present time this interpretation is performed
by means of both ERTS-1 and Skylab imageries and by
aerial photographs of some strips in the Central
part of the Island.
While with the ERTS images, and in particular
with bands 5 and 7, probably due to the season, the
largest lineaments seem to be very well detectable,
with the Skylab photographs some difficulties arose
because of the season and the smoother responsivity
of the.simple bands.
The lineaments are drawn easy enough only if
interpreted with the key of the false colour and/or
the multispectral composition analysis. This fact
happens probably because of many different causes
describing the same structural phenomenon: fractures,
moisture content and vegetation behaviour seem to
be joint factors indicating the continuity of the
faults.
After having drawn a first thematic map "by
pencil and eye" on the false colour images, an accurate
study was carried on the stereo pairs of B & W aerial
photographies covering part of the area interested
by a unknown fault system crossing the island in N-S
direction.
Then the interest was pointed on a number of
small fractures distribued over the whole Sicily.
An attempt was made, using the ERTS-1 band 7, as
well as the infrared band of SL-3 multispectral camera
.- /...
c. N. R. gio N
LAB. PER LA GEOFISICA DELLA LITOSFERA Foglio N
to recognize the averaged trend of the system of
faults in the central part of Sicily (FRTS-1 -
NASA Final Report - Contribution of Snace Platforms
to a ground and airborne remote-sensina proaramme
over active italian volcanoes. Nasa Contract FO-
0 13 ) by usinr the derivative function applied in
absolute value and nlotted versus the image scanning
direction. The result indicated as main trend of
the central nart of the island the TF-PW direction.
But the influencp of the scanning lines was large
in comparison with the maximum possible resolution.
With the Skylab images a new analog method have been
applied.
We tried to employ the maximum resolution avai-
lable in order to better discriminate the targets
which lead to the whole lineament through their
distant correlation.
We applied, for each band, the negative support
on the corresponding positive, giving at the same
time a small and costant shift in two orthogonal
directions.
The resulting density is given by:
d a(x,y) - d a(x +4x, y +y) =
loa a(x,?) dmax -  log a(x +,x,y + y)=
loog) + dmax
a(x +6x,y +Ay)
where:
a (x,v) = intensity of band a in x,y
a (x +dx,y +Ay ) = intensity of band a in
x + Ax,y + Ay
= contrast of the rhotoaranhic
material
da x  ORIGIALpGBg =  maximum density of the
Omax OR UIG L i . photographic material.
C. N. R. 3
LAB. PER LA GEOFISICA DELLA LITOSFERA Fogli ................
The ratio stresses out the presence of a
discontinuity existing between the points (x,y) and
( x +4 x,y +A y ) i.e. the "derivative" function of
a (x,y) in both x and y directions.
This kind of enhancement applied to different bands
leads to a better understanding of the correlation
factors.
In this way discontinuities were discovered,
the longest ones mainly in NE - SW direction, the
shorterst along a coniugate axis.
The displacement used was just a little greater
than the resolution of the photographs microcontrast
of the employed duplicating film.
OF pOOR Q1U3 M
C. N. R.
LAB. PER LA GEOFISICA DELLA LITOSFERA Foglio N ............
REFERENCES
R.CASSINIS., G.M.LECHI., A.M.TONFLLI: 1974:
" Contribution of Space Platforms to the around
and airborne remote sensing programme over the
Italian active volcanoes ".
Proceedings of: Symposium on European Resources
Satellite Experiments - Frascati (Italy) - February 1974
R.CASSTNIS., G.M.LECHI., C.M.MARTNO., A.M.TONELLI: 1974:
" Results of a Remote Sensinc Programme over Italian
Volcanoes and their Environment ".
Proceedings of:'First General Conference' of Remote
Sensing Society - University of Aston - Birmingham
Sept.17-19, 1974.
G.M.LECHI., C.M.MARTNO., A.M.TONELLT: 1974:
" Analog techniques of data enhancement applied in the
study of geologic and geothermal features of Test-
Sites in the Italian recion (Central Alps and volca-
nic areas) illustrated by the images from ERTS-P and
other remote sensing platforms.
In press on proceedings of: S yposium of International
Society of Photogrammetrv - Commission VII - Panff,
Alberta (Canada) - 7-11 October, 1974.
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Fractures and lineaments of Sicily Island: Preliminary results on analog optical techniques

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