797 
B8BB + - + + 4//BBB 
BBB/ +—4 //BBB 
++/B+4 4 4-4 
#/* + 
+-4 + / 4/// 
-+—+*m —+—// 
**-_ BB/BBBB// 
44/BBBBBB//B 
4/4-/BBBBBBB 
/ + -* + IB//BBBBBBBB 
* + * //--////BBBB/BBB 
+BBBBBB/44444////BBBBB 
BBBBBBB/4///BB/4BBBBBB 
-B////--///BBB/BBBBBBB 
/4BB////-BBB/BBBBBBBBB 
/BBBBBB////BBBBB/BBBBB 
+B/-/BBB///BBBBBBBBBBB 
/BB//B///+BBBBBBBBSBBB 
/BBBBBB///BBBBBBBBBBBB 
+/bbbb////bbbbbbbbb//b 
—/++/B/+/BBBBBBBBBB// 
+ /B/4 ////8BBBBBBBB 
-/BB + ■‘•4///44B/BB 
+ /B/ 44444/BBBN 
+++ + //4///BBBB 
4-4 4444/4444/4-/ 
Z44//--///4 
- + - 4 4444-4BB/B 
4--444BBB4B 
+ + 4. + 444/4////B4 
— + 4/4 — 4444 — 44//B4 
44//BB 
4-# 
4 4/BB 
4# /B/4 4 
4/ /BB 44- 
44*44/44/ B 
4-/--4//BBB 
+ 4 ///BBB 
4 4/* -4 *4 B B 
BB44/4B 
BBB/-+—♦ 
4— 4BBBBB4 4 
44 + + 
/B/ + BBB 
4* + 4 *44 
/ B/ 
B 4 *4 
4 444/4 
444-4 +//44/H 
4-444-44 -44444/fi 
/4 4 4 4 --/444/« 
4 4fl/ —4// 4/44/B 
4 / B / 4 4-4//BB 
--//4-4 /BBBBB 
// 44 — 4—4 — BBBBB 
4 4BMBBB 
/BBBB 
// + // *—4BBB/ 
CTURP 
cation programs, which produced a seven category land use map 
in color, using a simple and universally available method 
suggested by Smedes, Spencer, and Thomson (1971, p. 2078). 
The method consists of recycling the output paper of a standard 
computer line printer several times, mounting a different color 
ribbon on the printer each time. Utilization of overprinting 
in combination with the various color ribbons available (we 
used red, blue, and green, which are available from IBM Corp. 
for the 1403 printer) provides a large number of potential map 
colors and enabled us to produce a 15 x 20 foot map of the 
study area, at a scale of 1:24,000, with 1.1 acre cells. 
CONCLUSION 
As most of the work for this paper was carried out by a 
graduate student in regional planning without an extensive 
background in quantitative analysis, it would seem that the 
potential for exploitation of the inherent advantages of machine 
processing of ERTS digital tapes is not limited to any particular 
discipline. While intrinsically more difficult to interpret 
than the photographic product, the flexibility of the tape data 
indicates that most users would find the investment in time 
necessary to acquire some skills in their use quite profitable. 
ACKNOWLEDGEMENTS 
The author is most indebted to Dr. H. N. Kritikos, Mr. L. 
Yorinks, and Mr. Mohamad Tavakoli, all of the Moore School of 
Electrical Engineering, University of Pennsylvania, whose initial 
provision of digital tapes and some basic processing routines 
made this work possible. The author has also benefitted greatly 
from discussions with Dr. E. Bruce MacDougall of the Department 
of Landscape Architecture and Regional Planning, University of 
Pennsylvania. 
REFERENCE 
Dhar, H., D. Meagher, R. Mills, R. Pierson, S. Sadler and 
C. Watson. 
1974: Regional Environmental Assessment Procedure. Office 
of Planning and Research, Department of Environmental 
Resources, Harrisburg, Pa. (in press). 
Smedes, H. W., M. M. Spencer and F. J. Thomsen. 
1971: Reprocessing of ERTS Data Channels to Make Computer 
Terrain Maps of a Yellowstone National Park Test Site. 
Proceedings of the Seventh International Symposium on 
Remote Sensing of Environment, Willow Run Labs, 
University of Michigan, Ann Arbor, V. Ill, pp. 2073- 
2094 .