Sorry to reply to myself... I just though this could help other listers...
It seems that r.le.patch provides a way to get a count of cells by
attribute in each sampling unit with the option att=a5. One must
previously define each attribute value as a group (e.g. with r.le.setup)
and things work fine at least with rectangles. I will have some control
trials with circles later on...
Patrick
Patrick Giraudoux wrote:
Dear listers,
I am exploring r.le and r.li, but I am afraid those two sets of
programmes are providing what I need only partly. Before using them
for shape and diversity analysis, I just would like to get the number
of pixels (or the area) by attributes types (eg the attribute is a
class of CORINE landcover or any classified image) in each sampling
unit into a text file. Sampling units would be circles of a given
radius centered over sites (overlayed on the raste to analyse). I can
provide either a vector file with the center points or imported
polygon shapefiles. Surprisingly it seems that this simple statistics
is not provided in r.le (maybe wrong ?). I suppose this may be due to
the fact there is a much more simple way to do it in GRASS, but cannot
find it in Neteler and Mitasova book.
Any hint welcome,
Patrick
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