356 
The quoted parameters (in fig.l) relate to the employed TIR- 
scanner. With a comparatively high radiometric resolution and a 
poor geometric one the scanner is well suited for basic investi 
gations and method development, especially of relatively homoge 
nous surfaces. 
The prime EFAS objectives concentrate on environment research and 
monitoring. In this field we cooperate with the following insti 
tutions : 
- Institute for Environment Research (IFU, Berlin) 
- Institute for Geography and Geoecology (IGG, Leipzig) 
- Central Institute for Physics of the Earth (ZIPE, Potsdam) 
- Research Centre for Soil Fertility (FZB, Müncheberg). 
The data interface between IKF and the cooperating research 
centres is illustrated in fig.2. 
3. TIR-Scanner 
The TIR-scanner was developed and produced by the Physical Tech 
nical Cryogenic Institute (FTINT) in Charkow (USSR). 
The detector of the scanner is cooled by liquid Nitrogen. Its 
working temperature is about 70K. The detector is irradiated 
over a mirrored modulator, either over the modulator mirror from 
the reference black body or the ground radiation, mirrored from a 
rotating prism for scanning the earth surface. The detector 
output difference from the black body to ground radiation is the 
absolut input signal for the analogue digital converter with 12 
bit resolution (fig.3). The radiometric resolution is about 
0.IK .To get the real temperature of the earth surface it is 
necessary to eleminate radiation disturbances. 
The area of one ground pixel is 4.6*4.6m2, if the aircraft is 
flying in a height of 500m with a speed of 200km/h (fig.4). That 
means a track width of 600m over the 128 ground pixels. 
The FOV is lrad and the IFOV is after a rebuilding llmrad. 
(before it was 20mrad). 
4. Airborne Acquisition and Recording Complex on Modular Computer 
System (8 Bit) 
The last flight campaigns were done with an airborne recording 
complex, which consists of an 8 bit modular computer system with 
magnetic tape recorder und colour-TV. 
The computer is based on the usual OEM-system with the processor 
Z80. This system was able to record data from the TIR-scanner. 
The maximal data transmission rate of 148 kByte/s was determined 
by the connected magnetic tape recorder MBS 161. The brutto 
storage-capacity per tape was 22 MByte. 
The data rate of the TIR-scanner connected with the recording 
complex was 3 kByte/s. The realtime visualisation of data was