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i. Image Scanning and Digital Conversion 
i. Map Conversions - Line Following, Raster Scanning 
iii. Geographie Coordinate Reference Point Locations 
B. Output Devices 
Output hard copy will take several forms, each with its own uses, 
advantages, and disadvanteges. Interest will be in the capability, 
functions, and potential uses of the various types of devices. 
i. Film Recorders 
ii. Paper Hard Copy Printers and Plotters 
4, Displays and Computer Graphics 
A large amount of analysis of remotely sensed data is interactive image 
analysis using image monitor displays, with or without overlays of digitsl 
data planes. 
A. Display Techniques 
The large size of the desired display images (1024 x 1024 or larger) and 
the concurrent need for several simultaneous image and data planes place a 
large burden on memory and interface data rate requirements. A particular 
requirement for interactive analysis is that there be no interruption 
during updates. 
i. Display Media (CRT, eto.) 
ii. Refresh Techniques and Memory Management. 
iii. Data Plane Overlay Techniques 
B. Interactive Techniques 
Interactive analysis typically requires the identification of particular 
image points, lines, and areas, and often the overlay of various data 
planes such as masks, maps, and annotation. 
i. Light Pen Techniques 
ii. Cursor Techniques 
c. Human Factors and Man-Machine Interface 
Continued attention must be paid to the efficiency of the analyst when 
interfacing with the computer. Additional factors beyond those normally 
considered for alphameric or computer graphics display may be important 
when dealing with image analysis and display. 
i. Types of Program Control - Menus, Commands, etc. 
ii. Types and Sizes of Displays 
iii. Division of Labor between Man and Machine