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Tuominen, H. V.

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https://ntrs.nasa.gov/search.jsp?R=19760006460 2020-03-22T17:24:25+00:00Z
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Investigation of LANDSAT Imagery on Correlations
between Ore Deposits and Major Shield Structures
In Finland (X
Investigation number: 28600
s
RECEIVED
NASA STI FACT
ACQ• BR.
1 DECO219 5
i	 1 s	 ^	 •,
Principal Investigator: Heikki V. Tuominen
Department of Geology and Minerplogy,
University of Helsinki,
SF-00170 Helsinki 17
Finland	 i
Quarterly Progress Report I
X Secondary discipline: Ice Investigation in the Gulf of Bothnia
(176-OCC61) AVESTIG)TION CF LANCSAT
	
N76-13548
IMAGEFY CN CCRRELATICDS BETWEEN 061 I;EPCSITS
ANE MAJOR SHIELC STFUCTURES Ih FINLAbr
Quarterly Progress FeEort (Helsinki Ur.iv.) 	 Unclas
10 p HC $3.50	 CSCI 08G 63/43 00061
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I Introduction
In the Baltic Shield several types of important ore deposits, and
indications of ore, are distributed in line with major fracture zones.
Owing to glacial drift cover, shallow topography and great width of the
zones (up to 50 km) these zones are not easily detected in the field
by ground or airborne methods. The purpose of the investigation is to
estimate the expected advantages of LANDSAT-2 imagery in expioring these
structures. The test area (fig. 2) for the study represents the central
parts of the Shield.
In March 1975 an ice investigation;: in the Gulf of Bothnia was included
as a secondary discipline in the program. For this reason the LANDSAT-2
coverage was extended west across the Gulf of Bothnia. The ice study
is a joint program between Sweden and Finland. A preliminary report of
this study, made by professor Erkki Palosuo, is added as a suplement to
the geological report.
The LANDSAT-2 imagery so far received for both disciplines is shown in
Table 1, and its coverage in Fig. 1, 2 and 3. Formats of the images are
60 mm negatives and positives and 9, 5 inch positives. 9, 5 inch negatives
would have been useful. A four tape set of the image 1039 - 09315 has
also been .received. Coverage of the NE-part of the test site (fig. 4)is
not complete.
II . ec iniques
B&W paper prints have been made of the 60 mm positives by the Finnish
National Board of Survey, Photogrammetric division. Compilation of the
images to mosaics is going on.
Optical transformation of the LANDSAT-2 data to so kalled Wiener-spectrum
form was made by using laser light and a special lens system— Ii! the Wiener-
spectrum spatial information of images is arranged according to direction
and frequency. By passing the Wiener-spectrum through an optical filter
direction and frequency information of the original image can be enhanced.
The instrument used is the IFP optical filter FO-100.
Processing of various background data is going on. Optical filtering of bog
and water maps and topographic maps has been made. Digital processing is
used to prepare enhancement maps from the Bouguer -anomalies of Finland.
The aeromagnetic map of Finland is being digitalized.
III Accomplishments
The quality of the received images is fairly good and indications of geolo-
gical s::uctures and -units can be observed. The evaluation of structural
units and fracture traces has been initiated. However, cloudcover (see
table 1,. evaluated cloudcover in parenthesis) and inhomogenous humidity
of snow (especially in band 7) hamper the interpretation.
Eskers and end moraines are clearly visible. An interesting detail (seen in
scene 2137-08482) is an esker in Lake Saimaa . Furthermore, dune-forma-
tions near Lake OulujXrvi (scene 2084-08532) were detected due to their
feather-like forms.
Certain features, such as differences in the amount of conifers are best seen
in the winter images.
Soil and vegetation naturally reflect bedrock features. Schistbelts in Southern
Finland are discerned because of their textural patterns. Circular granitic
domes, dolerite dykes and gabbro massifs are also observable.
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Investigation of Landsat imagery on correlations between ore deposits and major shield structures in Finland

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