364 
1. Importation of images: Due to the fact that the 
images were provided in CDROM, the first action was 
to download them to the computer hard disk, converting 
them to the software used format. 
2. Preliminary hardcopies: in small scale to choose 
and identify the grown control points (G.C.P.) that will 
be used for the image georeferentiation and 
rectification. 
3. Control Points Selection: almost 18 points were 
selected per image, having in mind that the points 
would be as close to the borders as possible and the 
same point fall in the neighbour images too. The other 
factor to have in mind is the proximity of the points to 
any point of the Provincial Basic Net, meassured 
recently. 
4. Recognition and Survey campaigns: consist of the 
vinculation with GPS(Global Positioning System) 
between the selected points and the Provincial Basic 
Net points. Also, in this field outgoings pattern 
recognition and identification were made, which are 
viewed in the images to add them in the charts as 
orientative information referent to the diferents land 
uses. 
5. Field data processing: include all the cabinet works 
needed to obtain the GCP coordinates. 
6. Image Rectification and Georeferentiation: This 
stage involve the process from the point marking in the 
images to the end when the image is appropriately 
rectificated. 
(M.G.I.), 30’ of width and 20’ heigh in our case to obtain 
1:100.000 scale charts. 
8. Charts edition: Consist of surrounding the cut piece 
into the sheet, overlaying the corresponding quadrille 
mark whith the plane coordinates, adding all the 
marginal information, etc. 
9. Images mosaicking: This process consist of 
overlapping, verification and eventually the colour 
adjustment of neighbour images, when they fall into the 
same chart frame. 
10. Plotting: Finally the edited charts printout operation 
is issued. 
METHODS AND MATERIALS 
In this work we used a total of 11 (eleven) images Land 
Sat TM, 7(seven) of which were provided to the 
province by the National Hidrics Resource Segretarie. 
This year the province acquired other 6(six) images, 
4(four) of them cover mainly neighbour provinces areas 
(Chaco, Santa Fe and Cordoba), with small pieces of 
the east and south of our province; the other 2(two) of 
them were used in replacement of 230-78 and 230-79 
images of 1994, in which we detected important 
defects. 
We can see the information of the images used in the 
following table: 
7. Image cuting: The rectificated images are cut 
through following meridians and parallels lines, whose 
size is established by the Military Geographic Institute 
ORBIT 
DATE 
ROWS 
COLUMNS 
BANDS 
230-78 
27-04-97 
5760 
6920 
2,3 y 4 
230-79 
27-04-97 
5760 
6920 
2,3 y 4 
230-80 
24-07-94 
5920 
6475 
2,3 y 4 
229-78 
17-07-94 
5920 
6484 
2,3 y 4 
229-79 
18-08-94 
5920 
6480 
2,3 y 4 
229-80 
18-08-94 
5920 
6475 
2,3 y 4 
229-81 
04-04-97 
5760 
6920 
2,3 y 4 
228-78 
28-03-97 
5760 
6920 
2,3 y 4 
228-79 
28-03-97 
5760 
6920 
2,3 y 4 
228-80 
11-08-94 
5920 
6475 
2,3 y 4 
228-81 
13-04-97 
5760 
6920 
2,3 y 4 
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