Problem with r.cost?
malcolm at cast.uark.edu
Mon Nov 1 16:15:18 EST 1993
Rick Thompson's original question:
> > Hello Grassers,
> > Does anyone know why r.cost is behaving so much differently in 4.1 than
> > in 4.0. The manual entry in 4.0 makes sense, but after using 4.1 r.cost,
> Several reasons:
> 1. 4.0 r.cost figures the cumulative_cost for a to_cell by simply adding
> its cost to the from_cell's; while 4.1 r.cost does it
> by adding the average_cost of the 'from' and 'to' cells to the
> from_cell's cumulative_cost.
> 2. *Absolute* cell resolutions are taken into accout by 4.0 r.cost
> ('normalized' to 100m), not by 4.1 r.cost.
> 3. 4.1 r.cost takes more 'neighboring' cells into accout as your
> request, while 4.0 r.cost doesn't. And ...
> Jianping Xu
> jianp at ocean.rutgers.edu
This is very handy to know; why doesn't the manual make any mention of these
P.S. By the way, Jianping, how did *you* find out about this?
Malcolm D. Williamson - Research Assistant E-mail: malcolm at cast.uark.edu
Center for Advanced Spatial Technologies Telephone: (501) 575-6159
Ozark Rm. 12 Fax: (501) 575-3846
University of Arkansas
Fayetteville, AR 72701
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