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Path/Row Passday 
003/71 May 4th-90 
003/70 Jul 12th-86 
003/70 Aug 8th-90 
004/70 May 30th-91 
004/69 Oct 2nd-90 
004/69 Jun 22nd-90 
005/68 Jul 26th-86 
005/69 Aug 6th-90 
006/67 Aug 13th-90 
006/68 Aug 13th-90 
006/66 May 25th-90 
006/66 Aug 16th-91 
006/65 Jun 13th-91 
006/64 Aug 7th-88 
006/63 Aug 26th-89 
007/65 Jul 19th-90 
007/64 Sep 18th-89 
STS/26 frame 40-055 
Sun Angle 
40 
37 
40 
38 
53 
39 
40 
40 
43 
43 
43 
46 
42 
48 
51 
42 
54 
p.m.(Shuttle Hasselblad color print) 
*Thematic Mapper band 3 Mosaic of Brazilian Amazon (1:2,500,000) - (Figure 1) 
*DMA Navigation Chart ONC N-25 (1:1,000,000) 
*LANDSAT-MSS Planimetric Chart of Peru (1:1,000,000) 
Table 2.Images and Maps. 
TM frames listed above are all system corrected. The accuracy for internal measurement in those frames 
is 1 pixel (30 meters) and the accuracy of absolute positioning falls within 1 kilometer in latitude and 400 
meters in longitude. 
cedure in such cases was: 
-To select summer images with higher sun angles 
or; 
-To outline the river following the linemaps 
available or; 
-To trace the shadow of the slope in the winter 
image. 
The images of Peruvian Amazon are much more 
simple to be selected because the dry season of the 
river comes very close to the dry season of the 
weather (cloud free) and so the main stream is easi- 
ly draftet. However one image of the end of the rainy 
days (May) shows the Ucayali low waters flowing in 
the longer meanders. Cloud free images of the wet 
season would show a longer Ucayli. This is not the 
case for lower Amazon waters in Brazil. 
477 
The mouth of Negro River reaches the flooding 
peak in June wich is the center of the dry season 
(Soares, 1958). Cloud free images of the middle 
Amazon are oftenly from June, July and August wich 
means dry weather and flooding season. The 
Amazon in the flooding season meanders harder 
imbricately with larger margins around islands. In 
these cases we have followed the longer and the larg- 
er stream. To our understanding in some sections of 
the Amazon as in the Japura River domain and 
Matapa Island near the city of Santarem the main 
stream of the wet season may be not the main stream 
of the dry season. 
Availability of cloud free images made just pos- 
sible to analyse a dry Ucayali and a flood Amazon. 
The focal point to our model and the main 
attribute of the Amazon in multispectral data is the 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B7. Vienna 1996