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INTEGRATION OF VARIOUS TYPES OF REMOTE SENSING DATA FOR THE 
MORAVA RIVER CATCHMENT EVALUATION 
Lena Halounová 
MGE DATA, s.r.o, Vrchlického 60, 150 00 Praha 5, Czech Republic 
tel. 0042 2 5721 1942, fax: 0042 2 5721 6313 
E-mail: lhaloun@mgedata.cz 
KEY WORDS: flood, RADARSAT, Thematic Mapper, SPOT 
ABSTRACT. During the flood in 1997, situation in Moravia was studied from the quickest available satellite 
data - from the Canadian satellite RADARSAT Standard Mode with 30 meters resolution. These i images which 
form an archive record of an immediate real state, were processed to evaluate the flood situation. The northern 
part of Moravia was imaged twice. The first image showed the flood peak and the second one the end of flood. 
The southern part of Moravia was imaged three times - the peak of flood, the end of flood and one more image 
shortly before the end of flood. Black and white radar images show easily distinguished water bodies. Radar 
images are useful for interpretation of water, forest, urban areas, agricultural areas as different units, however 
also for smooth surface versus rough surface, or dry surface versus surfaces with higher moisture. 
To study deeply flood impacts in the inundation region optical data were used. Two types of scanner 
data were combined with radar images - Thematic Mapper with 30 meters resolution from the second half of 
August 1997, two SPOT multispectral images from spring 1997 and one SPOT with 20 meters resolution 
multispectral image from August 1997. The situation before flood was on two images - two SPOT XLS, after 
flood on two images - Thematic Mapper and SPOT. 
Satellite data were also applied for up-dating water management maps - for accurate localisation of 
rivers, and detecting accurate shape of water basins. 
Combination of radar and optical data was very fruitful. Radar images presented real flood situation 
already within two days from data order regardless bad atmospheric conditions. Optical data which are unlike 
RADARSAT data archived, were implemented later for creating land use maps as an input into the model of 
erosion susceptibility. None of them were from the flood because of the weather. 
1. INTRODUCTION 
Very intensive rainfall at the beginning of July 
caused extensive flooding in the eastern part of the 
satellite imaged the northern part of Moravia on 
July 10. An additional four images were ordered to 
archive immediate states of the flood. Detection of 
  
  
Czech Republic. On Friday, July 4, 1997, a low 
pressure system which originated in northern Italy 
tracked northeast to the Moravia region of the 
Czech Republic. This system brought extreme 
rainfall as it moved to the southeast of Poland and 
Silesia on the morning of July 6. Over a five day 
period the total rainfall volume for one third of 
Moravia(10 000 km2) was 500 mm. The average 
rainfall for the Czech Republic is 600 mm/yr. This 
volume of rain was the reason for the flood caused 
by 100 to 400 year discharges. On Tuesday July 8 
the first RADARSAT image was ordered and the 
Intemational Archives of Photogrammetry and Remote Sensing. Vol. XXXII, Part 7, Budapest, 1998 
flooded areas on all images was performed. 
Determination of flooded areas on post-flood 
images was studied. 
Satellite radar images as the most 
operational data (available under any atmosphere 
situation) in 1:25 000, 1:50 000 and smaller scales 
can be a valuable data source for generating this 
information. 
  
  
  
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