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Drainages 4, 5, and 6, located at the western side, drain the salt 
materials toward the west. 
The distribution patterns of salt plug materials show a similarity 
to the spatial pattern of the Firouzabad river tributaries (Fig 4). 
The most important part of Firouzabad River that was polluted 
directly by the salt plug is situated at the northern part of the 
Jahani. This contact was clearly detected by the image 
processing (Fig 4). 
Comparison of using different input to MLP approach showed 
that MNF input provides more accurate result than the IARR 
and PC A inputs. Results also demonstrated the viability of 
VNIR+SWIR dataset of ASTER in combination to the MLP 
approach for mapping the salt plugs and identifying their 
environmental impacts. 
7. ACKNOWLDGEMENT 
Figure 4. MLP mapping result, GIS layer of Firouzabad River 
and its tributaries are overlaid the image. Yellow boxes indicate 
the locations of polluted areas surroundings the Konarsiah, 
Jahani and kohe Gach. The labels’T, 2, 3, 4, 5, 6, and 7 
illustrate the main polluted drainages. 
The authors would like to thank the Research Vice Chancellor 
of Shiraz University, Iran. The ASTER data were provided by 
the land Processes Distributed Active Center (LP DAAC), 
located at the U.S. Geological Survey (USGS) Earth Resources 
Observation and Science (EROS) Center. 
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Kohe Gach is a small salt plug and is located at the western part 
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materials toward the east (Fig 4). 6 
6. CONCLUSION 
Results of MLP neural network at the south Firouzabad plain, 
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