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In connection and in support of studies on performance and reliability a sub- 
group of Working Group II/2 is conducting the "ISPRS Correlation Test”. This 
international test was initiated in 1978. The first phase of the test whose 
goal was the evaluation of the methodology and the establishment of basic 
evaluation criteria was completed in 1982. Four organizations with five 
operating systems participated in the first phase. In 1982 the second phase 
of the test was initiated to consider the various parameters that affect the 
process of correlation of conjugate images and to expand the number of 
participating organizations. Reports on the "ISPRS Correlation Test" have 
been presented at the Hamburg Congress and the Ottawa Symposium (Lindig, 1980; 
Allam and Schliebener, 1982). A report on the present status of the test will 
be submitted at the Rio Congress. 
Working Group II/3 on "Instruments for Analysis of Remotely Sensed Data". 
Chairman: F.C. Billingsley, Jet Propulsion Laboratory, California Institute 
of Technology, U.S.A. 
This is one of the two Working Groups (II/4 is the other) formed in 1981 to 
cover the activities of the working group on "Processing and Analysis of 
Remote Sensor Data" that was active in the period 1976 - 1980. Concurrently, 
with the splitting of the old group, the areas of interest were also divided. 
The emphasis of Working Group II/3 is on instruments for analysis of remotely 
sensed data (including systems, components, devices, configuration of hardware 
and software). Primary consideration of this group was on digital analysis 
because of the growing importance of this analysis method. However optical 
processing was also addressed (Billingsley, 1982). 
Topics related to the activities of Working Group II/3 are 'organized under 
five main themes. 
1l. Systems. This topic encompases the studies of large systems characterized 
by large computers with multiple peripherals and networking capabilities; the 
studies of medium size systems characterized by minicomputers that are 
incorporated in a large number of the stand-alone systems provided by 
industry; the studies of micro systems characterized by lesser cost 
microprocessors of lower capabilities which due to their low cost make the 
special multiprocessor configuration practical; and the studies of optical and 
hybrid opto-electronic systems. 
2. Media Conversion Devices. Analysis of remotely sensed data requires 
various other data types in conjunction with the imagery. This necessitates 
the conversion of data between various media. The tasks under this topic are 
concerned with the studies of input devices such as image scanners and devices 
for map conversion (e.g. raster scanners), and of output devices such as film 
recorders, dot and line printers. 
  
3. Computer Graphics Applied to Image Processing. Since image analysis and 
display places considerable requirements on the graphics systems, computer 
graphics are deemed sufficiently important to be treated separately. This 
topic encompasses studies of display techniques and interactive techniques as 
well as the analysis of human factors influencing the efficiency of interfaces 
between the human and the machine. 
a, Special Devices. The developments in the area of microcomputers and the 
area of very large scale integrated circuits (VSLI) may make the use of 
special devices more commonplace in image processing. The tasks under this 
topic are related to the studies of potentials for special purpose peripherals