ılly con- e
eomodels
t lines
puter pro-
Stereopair
utomati-
ic features
orthopho -
le 70-mm
jitude and
in be used
it, control
for the
nage dis-
mined
roduce
| designed
09 to pro-
at,
ly re-
re formed
> and
tors ver-
imulta-
recorded
system
hoto-
ls are
ies were
natic
yroduc -
he pro-
ne end
line,
and pro-
. Inter-
f
| the
1ew EROS
> a wide
m photo-
- Infrared-reflective vegetation
- Massed works of man.
The system is not limited to these theme categories but is using them to typify user re-
quirements in the experimental phase,
Optical filter methods have been used successfully to separate thematic information, but
because a digital approach would be more compatible with operations at the EROS Data Center,
research is being concentrated in the development of digital methods that will convert images
into digital density values, which can be separated to reproduce the imagery in assigned (arbi-
trary) colors or to reproduce imagery of only selected density values.
(December 1971)
References
Doyle, Frederick J., 1971, The rough earth on smooth paper, U.S. Geological Survey.
Lorenz, Gilbert G., 1967, Automation in photogrammetry, U.S. Army Engineer Topographic
Laboratories,
Luetje J.H., 1970, Interactive aeronautical charting, IBM Systems Journal, Vol. 9, No, 3.
National Aeronautics and Space Administration, 1971, Data users handbook, NASA earth resour-
ces technology satellite, Document No, 715D4249,
Thompson, Morris M,, 1969, Automation in topographic mapping, U.S. Geological Survey,
U.S. Army Topographic Command, 1971, Topocom technical papers presented to ASP-ACSM
Convention,
U.S. Geological Survey, 1969, Proceedings of the symposium on map and chart digitizing,
USGS Computer Contribution No, 5,
U.S. Geological Survey, 1971, Annual report on research and development,
U.S. Geological Survey, 1971, Summary of cartographic activities of the U.S. Geological Survey
for the national report of the United States to the general assembly of the International
Cartographic Association,
Wong, Kam W,, 1971, Television display of topographic information, phase II, University of
Illinois, ETL-CR-71-23,
BES
