Rich Shepard wrote:
On Tue, 23 Feb 2010, Markus Metz wrote:
Almost right. ...with surface flow accumulation between 0 and the
threshold value.
Markus,
Now I understand, yet still miss the difference between the
accumulation
map and the visual map.
All flow accumulation values larger than the threshold value are set
to the threshold value.
Got that from the man page.
I forgot, the difference between flow accumulation and visual output is
not only that all flow accumulation values larger than the threshold
value are set to the threshold value, but also that all negative values
are converted to positive values.
Number of cells draining through a given cell. Converted to squared map
units by multiplying with nsres * ewres, of the flow accumulation map of
course, and first setting the computational region to match the flow
accumulation map with g.region -p rast=<my_flow_acc>. -p to check that
everything is all right.
I assume that the above calculation is left for me to do; that the
module does not do the math before displaying the results. Am I
correct in
my assumption?
Yes.
One last point: why no color in the legend? There is color on the
visual
map but not on the accompanying legend. Strange and I don't know how
to fix
this.
Must be a problem of d.rast.leg, no quick help from my side, sorry!
Markus M
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