McIDAS-X Learning Guide
Version 2020
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There are three ADDE data transfer methods available for sending data from remote servers to your client workstation. The methods are gzip-compressed, compressed, and uncompressed.
The gzip-compressed and compressed methods are most beneficial to users who transfer large data files or those with slow data connections. However, they only reduce the amount of data during the transfer; they do not change the resultant file size or accounting (the byte counts remain the same). For example, the destination file size from an IMGCOPY command is the same no matter which of the three methods you use. If most of the datasets you access are on a local network with fast transfer rates, then using the uncompressed method is probably best because it minimizes overhead.
The data transfer method you use on your client workstation is determined by the setting of its MCCOMPRESS environment variable. Because it's an environment variable, the method you select is the default for the entire McIDAS-X session. The only way to change the default method is to exit your McIDAS-X session, change the setting of MCCOMPRESS, then restart McIDAS-X. To override the default setting on a command-by-command basis, use the MCCOMPRESS global keyword with any ADDE command.
See the McIDAS User's Guide for more information on using compressed data transfers.
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