Abstract
Usually CCT (Computer Compatible Tape) is used as the secondary memory medium in the digital image data handling. Even though the computer systems are different from each other, the digital image data can be exchanged among them using CCT in the most cases. However most of micro-computer systems don't support CCT controller. Recently, as the usefullness of micro-computer systems in the image processing has increased, a new data handling method for micro-computer systems has become necessery.
Since this spring RESTEC has started a new distribution of Landsat MSS data by 8-inch floppy disk to the micro-computer users. 8-inch floppy disk is one of the most popular secondary memory medium for micro-computer system. This report describes about an overview of 8-inch floppy disk and how to handle "RESTEC Landsat floppy disk" using micro-computer systems.
The format of RESTEC Landsat floppy disk is as follows.
1. Disk-format
* Physical format
IBM Part 1766872
* Logical format
IBM (256-2D) format
2. Data format
BIL or BSQ
512pixels X 4001ines X 1byte X 4bands
Micro-computer system usually has its own disk logical format according to its own operating system. The authors propose two ways to handle the RESTEC Landsat floppy disk using micro-computer system. One is to use IBM format conversion program supported by the micro-computer makers. Another is to use the secter access command of BASIC and readout the data in a certain secter of the disk. The authors call the later method "Direct sector access method".
