Hello,
The ENVI 5.0 application does not have the arbitrary transect tool yet, but you do have access to the ENVI Classic application, which does provide this tool. If you're on a Windows operating system, look under the Start menu > Programs > ENVI 5.0 > Tools > ENVI Classic.
Open the image in ENVI Classic, then display the image using the Available Bands List. You should see a three-window display group. Under the display group menu bar, select Tools > Profiles > Arbitrary Profile (Transect).
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