Some images, mainly the corresponding to 1994,
exhibit various types of defects. The most frequent ones are
the streeping and the horizontal lines of the same colour,
produced for lost pixels (not adquisited for the TM sensor).
After proving diferents filtering alternatives we got acceptable
corrections using the Fast Fourier Transformation technics
offered by ERDAS. After this process the streeping
desapears but we could observe some little anomalies like
localized obscure shadows. These defects and the pixels lost
lines, were corrected through raster edition with the Aldus
Photostyler software.
During chart edition, some cases were presented,
which required a special treatment. When a chart because of
its location covers parts of various adjacents images we had
to realize a “mosaic” This operation consist mainly in a two
or more neigbhour images overlapping. The steps we made
for this purpose were:
1Identification of the required image parts. It is important to
express that with the software release we used (ERDAS 8.2)
these images have to be rectificated in the same projection
system and has to have the same pixel size.
2,- In the dialog box of the mosaicking command we have
diferentes overlapping options. The more apropiated
selection depends of the image features, for example the
capture dates that influence in its coloration. The solution we
used was the command Contrast Match which permit to work
with variable contrasts to unificate the coloration.
While the charts are being generated we produced the print
out of five originals of each. This operation was issued with
Hewlett Packard Design Jet 650C Plotter, with 36 Mbytes of
FRAM. The paper used was the HP High-Gloss Photo Paper
№ C3881A. The resultant charts are stored in CD-ROM.
CONCLUSION
The obtained results are very important because in our
province of Santiago del Estero there was not actualized and
complete graphic information. The 1:100.000 scale charts
obtained, constitute a basis from which it is possible to
advance in a large-scale cartographic project of greater
resolution like the 1:50.000 scale, for example by the
adquisition of SPOT images, due to the fact that we count
now with trained people.
Also having digital cartographic information it is possible to
undertake the creation of a Geographical Information
Systems for the more diverse uses.
Daniel PEREZ CALDO, Aldo Jorge GOMEZ,
Carlos GUTIERREZ y Juan Carlos LUNA.
BIBLIOGRAPHICS REFERENCES
• Arbiol, R., Romeu, J. Y Viñas, O.
1986 MAPA FALSO COLOR DE
CATALUNYA 1:100.000 A PARTIR DE
DATOS TM. Reunión Científica del GTT.
Barcelona - España
• Chuvieco, E, 1995. FUNDAMENTOS DE LA
TELEDETECCIÓN ESPACIAL. 2 da Edición
Buenos Aires, República Argentina.
• Manuales de ERDAS IMAGINE Versión 8.2
3 ra Edición. 1995.
• D'alvia, Antonio. 1989. LA PROYECCION
GAUSS-KRÜGERojas 13f Río Hondo, 13g
Santiago del Estero, 14g El Alto, 14h Villa
San Martín y 15g Frías. Servicio geológico
Nacional, subsecretaría de Minería. Buenos
Aires, República Argentina. 53 - 54.
• Gemael, Camil 1981. REFERENCIAIS
CARTESIANOS UTILIZADOS EM
GEODÉSIA. Apuntes del Curso de Pós-
Graduacáo em Ciéncias Geodésicas.
Universidade Federa do Paraná. Curitiba,
Brasil.
• Romeu, J., Pineda, L. y Arbiol, R. 1995.
IMPLEMENTACIÓN DE UN PROJECTO
CARTOGRÁFICO CON IMAGENES DE LOS
SATELITES SPOT Y LANDSAT SOBRE
1.000.000 DE KM 2 EN LA REPUBLICA
ARGENTINA A ESCALAS 1:50.000,
1:100.000 Y 1:250.000
• Burick, Victor. 1973. Cuatro temas de
Cartografía Matemática, U.N.T. Fac. de C.E.y
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• Blachut Teodor J.; Chrzanowski Adam y
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RECOGNITIONS
The authors acknowledge the useful contribution offered in
the campaign jobs by the students of Land Surveying degree:
