[GRASS5] data format for s.vol.rst?

[Panoot Suwanwiwattana]

hi all,
I want to use s.vol.rst but i don't understand its module data format, my
idea should be (x|y|z @catagory %interpolation_value)  but when i import
site data from postgres, it will be like (x|y @catagory) so

1.  What is needed data format for s.vol.rst? like my idea?
2.  I have to write some script to export data from postgres then import to
GRASS like ascii file?
3.  How can i specify which column is for interpolate in s.vol.rst?
4.  the option field value in s.vol.rst is refer to what column eg. field =
2 (what does it mean)?

Thanks.

Mr.Panoot  Suwanwiwattana
        Research Assistance
Geotechnical Engineering R&D Center.
Kasetsart University, Thailand.
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