I'm a very beginner at GRASS. I'm using GRASS 7.0 and I tried to install r.vieshed.cva extension. When installed, if I type it in the command line, it appears

"r.viewshed.cva" is not recognized as an internal or external command, operable program or batch file

Could someone help me?

  • How did you install the extension and which operating system do you use?
    – markusN
    Jul 30, 2015 at 10:39

1 Answer 1


I probably have found the error and updated the command in the GRASS GIS Addons repository. Within 24 hours (i.e. tomorrow), the updated module will be online available:

g.extension r.viewshed.cva

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