Landsat digital data base (band 7) digital data base (band 7) output on an 
output on an electrostatic printer. electrostatic printer. 
NMAP (BRIGHTNESS MAP) 
OF THE NORM OF ALL FOUR BANDS 
EIGHT UNIFORM PERCENT CLASSES 
A* v» ' £i'*t 
rÿ" *' 
It starts with this file directly and processes sequentially from there 
The data are then reformatted into the ORSER RD format while replacing 
all pixels that lie outside the defined area with zeros (null pixels). 
The new data set, now in the ORSER RD format, is written onto the out 
put tape and can be processed by any program in the ORSER System that 
processes raw data. An example of a county data set extracted in this 
way and displayed using the ORSER NMAP program is shown in Fig. 3. 
Figure 3. Westmoreland County Subset 
Another program, PIOS, was required to extract the UTM coordinates of 
the counties and forest districts, as supplied on tape from GSFC. This 
program converts these coordinates to line and element numbers corre 
sponding to the data base, and produces input for the SUBDB program. 
6. DEVELOPMENT OF A USER-FRIENDLY FRONT-END 
Because much of the use of the data base involves moving large data 
sets from storage media to the computer and back again, most of the 
process of running jobs requires manipulating the Job Control Language 
(JCL). To reduce such manipulation to a minimum, a user-friendly 
front-end processor was developed to set up jobs. Such a system had 
proven very successful for the users of the ORSER System (Turner et al., 
1982). In the computing environment of PSU, where the main computer is 
a large IBM 370/3081 operating in batch mode, the best way to develop 
such a front-end is to use the EXECUTE facility of the INTERACT editing 
system, which was introduced at the University two years ago. 
INTERACT (formerly known as MENTEXT or WYLBUR) is an interactive system 
for program development, remote job processing, and document 
39