[GRASSLIST:9809] v.surf.idw batch processing

[Luigi Ponti]

Hello,

I am trying to use v.surf.idw instead of v.surf.rst because it seems to 
suite better my 105 unequally spaced weather stations in California in 
terms of interpolated raster: the range of the data is respected and 
there is no issue of tension and smoothing.

I wrote a script to batch-process a series of tables containing 
geo-referenced data that I import via v.in.ascii for subsequent 
interpolation.

Whith v.surf.rst the imported vector with data points is the only input 
and the appropriate attribute column has already been selected while 
importing via v.in.ascii by putting the correct column number=z.

However, whith v.surf.idw, in addition to the input vector, there is 
also a "col" string parameter which selects an attribute table column. 
So far, I have to open the DBF attribute table (where there are not just 
3 columns) and figure out a weird column name such as "dbl_4" that 
matches the column I want to interpolate (that I have already chosen 
when importing with v.in.ascii).

Why v.surf.rst can access the right column without any other 
specification and v.surf.idw cannot? Is there a fix for batch processing?

Thanks,

Luigi