Trying to use the v.buffer function to create a 500-foot buffer (map units are in metres, which is why I put 152.4 meters as the buffer distance) around the boundary of a property parcel (not the centroid). I'm unsure what to populate the "'Category values' and 'WHERE conditions of SQL statement without 'where' keyboard'. All I want to do is create a 500-foot buffer around the parcel boundary, so I am finding a lot of these fields don't apply to me. When I try to run what I have entered, I get the error that there are not enough arguments.
Yes, the WHERE conditions should not apply to your case, but unfortunately we cannot escape from this keyword - it is mandatory as far as I know.
I usually set a dummy (meaningless) condition, such as "ID" > 0 or "ELEVATION" < 1000000 so that the conditions always return TRUE.
[Example] - Natural Earth dataset
Ir has a
"scalerank" field which is always
1, so I can set
"scalerank" > 0 into the
Then v.buffer runs smoothly and returns output like below:
Many GRASS vector commands demand this WHERE clause - but I honestly do not know why.