International Archives of Photogrammetry and Remote Sensing. Vol. XXXII Part 7C2, UNISPACE III, Vienna. 1999 
166 
UNISPACE III- ISPRS/NASA Seminar on 
I5PR5 
“Environment and Remote Sensing for Sustainable Development” 
9:00 am -12:00 pm, 23 July 1999, VIC Room A 
Vienna, Austria 
The Principle of imaging over the defined area is represented 
on Figure 3 
During the flight the electronic and computer equipment 
incorporated into the system performed excellently. The hard 
disk of the recording computer showed a stable operation 
capacity' when the atmospheric pressure became lower. The 
buffers used to smoothen the vibration caused by the 
propellers were suitable The communication and the cable 
connecting to the recording computer showed a stable 
performance and a sufficient transfer rate for this particular 
task. 
4.3. Data processing and analysis 
The first tests made with the panchromatic CCD camera 
provided very good results (fig.7). The images acquired show 
a high degree of detail and good contrasts. Over 50% 
overlapping of adjacent scenes was achieved w'hich is 
completely sufficient condition to extract the relief and to 
obtain stereo pair images over the whole study area. These 
tests defined the main trends and problems, which have to be 
solved during the next stages of the project. In the first place 
special attention should be devoted to the increase of the 
quality of the image. It is necessary' to use certain 
transformations in order to avoid tire Moare patterns and to 
minimise some image defects. Also the possibility is 
envisaged to enlarge the imaging area using a 4096 x 4096 
pixel CCD matrix instead the tested one of 1100 x 488 pixels. 
The other main trend that will be developed during the 
following stages of the project is the accurate adjustment of 
the imageiy to the geographical coordinate systems. The aim 
is tlie scenes to be geographic referenced with maximum 
precision during their capturing so that during the following 
stages of processing and analysis to minimise the labour 
consuming procedure for their geo-coding. 
Regardless to the limits defined by the panchromatic type of 
the camera the images obtained with the high resolution 
provide representative information for the identification of 
individual objects such as different rock types, soils and 
vegetation, morphological specifics of the relief, structural 
tectonic characteristics of rocks, faults, folds and bedding. 
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