Some amendments of the Draft Resolutions 
were made after remarks from Mr. Sievers, Dr. G. 
Hildebrandt (F.R.G.), Dr. W. Fischer (U.S.A.), 
Dr. G. Kupfer (F.R.G.), and Mr. Corten. Dr. Fischer 
proposed that the concept image quality should 
also include the dynamic range of the receptor. 
He also suggested that the number of exterior 
orientation elements should be seven, including 
time. 
After having closed the business meeting, 
Dr. Welander had time to introduce Mr. H.-J. 
Bóhnel (F.R.G.), who summarized the Presented 
Paper on the "Radiometric Determination of 
Spectral Signatures for Natural Surfaces" 
(PP 1/04) by Mr. Bóhnel, Dr. Fischer and Mr. G. 
Knoll (Austria) 
Friday, July 23, 1976, from 9.00 to 10.30 
Session 9 of Commission 
Topic: Progress in Remote Sensing 1972 
—1976 
Chairman: Dr. E. P. Welander (Sweden) 
Presented Paper 
Author: Dr. H. G. Jerie (Netherlands) 
Title: Proposal for a Modification of Line 
Scanners and Panoramic Cameras 
for the Acquisition of Stereo Imagery 
PP 1/20. 
Panel Discussion 
Topic: Remote Sensing 
Moderator: Dr. W. Fischer (U.S.A.) 
Panelists: Dr. F. Doyle (U.S.A) 
Dr. S. G. Gamble (Canada) 
Dr. G. Hildebrandt (F.R.G.) 
Dr. H. G. Jerie (Netherlands) 
Dr. L. Sayn-Wittgenstein (Canada) 
Dr. H. Schmid (Switzerland) 
Dr. E. P. Welander (Sweden) 
Dr. Doyle raised the question of what would be 
more appropriate to have in a remote sensing 
system — a film return system or digital MSS 
data. Digital data have so far too low a resolution 
for photogrammetric and cartographic appli- 
cations. 
Dr. Gamble pointed out that Landsat data had 
been used for map revision at small map scales. 
But the major efforts in map revision will be 
at larger scales, such as 1:20000 — 1:50 000, 
for which purpose a system with higher reso- 
lution will be needed. 
Dr. Hildebrandt pointed out that a number of 
thematic maps such as land-use, forestry, and 
agricultural maps must be considered, in addition 
to topographic maps. 
Dr. Jerie said that a distinction has to be made 
between one-time-surveying missions and 
90 
monitoring systems. Aerial systems should be 
used for the first type of missions and space 
imagery for monitoring systems. He also asked 
if fields of co-operation could be defined between 
remote sensing specialists and photogrammet- 
rists. 
Mr. S.-G. Méller (Sweden) proposed that a special 
Commission within the I.S.P. should be organized 
to deal with what landscape information we 
need and how to classify it. 
Dr. A. Fontanel (France) thought that film 
return systems would bring about tedious digiti- 
zing for having the information processed by 
a computer. 
Dr. Doyle felt that it was not necessary to 
digitize film information; analogue procedures 
could be used preferably, but the digital way is 
one of the best ways to handle data which are 
in digital form. 
Dr. Gamble noticed that the best computer in 
many tasks in the human brain. 
Upon a question from Mr. Móller, Dr. Hildebrandt 
and Dr. Doyle stated that users' requirements 
on remote sensing are considered to a reason- 
able extent. 
Upon a question from Dr. Jerie, Mr. R. Ondrejka 
said that remotely sensed thematic data have 
acquisition requirements common with photo- 
grammetric requirements and told an example 
of oil and mineral exploration. If the proposed 
geological missions had a five per cent inpact 
on U.S. petroleum and gas exploration it would 
be valued over $ 5 billion over the next 15 years. 
Mr. Difas (G.D.R.) asked Dr. Hildebrandt in what 
area of the spectre the spectral resolution should 
be improved. Dr. Hildebrandt answered that he 
had meant the Landsat and referred to his pre- 
sented paper in Commission VII. 
Dr. R. Heller (U.S.A.) told about experiments 
using aircraft scanners and suggested that future 
satellite MSS-systems have narrower wavebands. 
Dr. H. Rib (U.S.A. said that his experience 
indicated that Satellite data are suitable for 
detailed investigation only in a few applications. 
Dr. Doyle pointed out experiences from Skylab 
13-channel scanner and spectral resolution. In 
future the channel number should be limited to 
reasonable and feasible amount. 
Dr. Schmid remarked that a wide use of remote 
sensing data could create metric requirements 
(xyzt). He was also of the opinion that remote 
sensing naturally belongs to the scope of the 
1.S.P. 
Upon a question from Mr. Méller, Dr. Doyle said 
that the use of the color IR-film used in Skylab 
should be possible also in high-altitude air- 
crafts, but is not yet available. 
Dr. Sayn-Wittgenstein pointed out that the utility 
of remote sensing data depends now more on 
interpretation methods (soft-ware) than on hard- 
ware. 
Dr. Fischer concluded the panel discussion. 
A film by the U.S.G.S., "EROS-Response to a 
Changing World”, was shown.