Coverage from a Vector {Plow,Plough,Spray,Search}ing

James Cameron quozl at
Tue Jun 27 01:05:37 EDT 2000

On Mon, May 29, 2000 at 07:50:26PM -0700, Eric G . Miller wrote:
> What about That is, you have a vector line (don't build
> areas!), you convert it to a raster with and then you make the
> raster grow to match the application spread.

Yes, I see.  r.grow is the one to use.

> Hmm, more difficult. I see where the application would be greater on the
> inside of a curve than the outside, and would be dependent on the angle
> of the curve (overlap). Perhaps this is a job for mapcalc? Is the vector
> track over regular units in time, or is it continuous with a speed
> element?  

Over regular units in time, I think.  The GPS gives me an x/y location
every second.  From that it (or I) can calculate the speed.

To make a linear spread, I could r.mapcalc "add" the original map to
the r.grow output.  Then do it again a few times.

James Cameron    mailto:quozl at

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