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REPORT OF THE ISP WORKING GROUP VII-9 
"SPECTRAL SIGNATURES OF OBJECTS" 
Jórn Sievers, Chairman 
Institut für Angewandte Geodäsie 
Richard-Strauss-Allee 11 
D-6000 Frankfurt am Main 70 
Federal Republic of Germany 
1. OBJECTIVE OF THE WORKING GROUP VII-9 
After the Helsinki Congress 'T6, the President of ISP Commission VII, 
Professor Hildebrandt, proposed the foundation of & Working Group 
"Spectral Signatures of Objects". This seemed appropriate and necessary 
since there existed (and exists) & demand for such object signatures to 
support partially automated interpretation processes and since in this 
particular field & certain standardization of measuring methods and mea- 
sures should be reached as early as possible. 
The Working Group should primarily be concerned with the following 
objectives: 
- exchange experiences in spectral measurements and discuss physical, 
methodological and technological problems of the measurement of spectral 
signatures, 
- compare and discuss results, particularly also their consequences 
relevant to remote sensing data, 
- standardize the use of terms, symbols, and reports of the measurement 
conditions in publications (resolution of the 13th ISP-Congress:"to 
ensure the standardization of spectral signatures, it is urged that 
experimentators report all measurement conditions in a comparable manner."), 
- and build up step by step a catalogue of spectral signatures especially 
from measurements in situ and from remote platforms. 
2. PRESENT WORKING PROGRAMME 
Since the first Freiburg Meeting in June 1977 two main topics have in 
particular emerged the discussion of which seems to be most important. 
Firstly the question of a suitable reflection quantity and secondly the 
question of the possible and necessary accuracy in measuring spectral 
signatures.