An AURELHY window of analysis ('auremask' object) specifies the regions relative to the point that define the various variables describing the landscape.
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type 
the type of window, either 
dist 
A vector of distances (in km) to consider in the window for the

angles 
A vector of angles in radians to use to construct a

n 
The number of grid points in latitude and longitude to use for a

keep.origin 
Is the origin where the window is centered considered as one point of the grid, or not (by default, not, as in the original implementation of the AURELHY method) 
x 
An 'auremask' object 
geomat 
A reference grid, as a 'geomat' object against which the window of analysis is tested (print or plot the number of points that are located in each sector of the window) 
y 
Same as 
... 
further arguments passed to the function 
auremask()
creates a new window of analysis. The object has print()
and
plot()
methods.
An 'auremask' object with all information required to mask a 'geotm' object (terrain model) for creating landscape variables required by the AURELHY method.
Philippe Grosjean <phgrosjean@sciviews.org>
polar.coords
, geomat
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