Full text: International cooperation and technology transfer

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 
T.- Inst. de Geodesia y Topografía. 
• Blachut Teodor J.; Chrzanowski Adam y 
Sacstamoinen Jouko H.; 1979, Cartografía y 
Levantamientos Urbanos. 
RECOGNITIONS 
The authors acknowledge the useful contribution offered in 
the campaign jobs by the students of Land Surveying degree:
	        
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