[GRASS-user] problem on vectorizing a float point raster

[Milton Cezar Ribeiro]

Hi Relpers,

In fact I really need that each pixel be a polygon. I know that the
number of polygons will be very large. But it is part of a research
on my lab, to see how different variables and scales can help to
explain some patterns that occurs on our region of interest.
The example of tempetarute at 30x30 m resolution is just
the highest fine scale we are analyzing.

When I run the raster to vector on arcgis it takes about
5 minutes, for my 2400x2400 image. But I would like
to turn the solution as general as possible because I
need run it at varying scales and for a large set of variables.

Thanks for your time.

cheers

milton

2009/6/11 Nikos Alexandris <nikos.alexandris at felis.uni-freiburg.de>

> (Kind of Off-Topic)
>
> Micha Silver:
> > As a further exercise, I took a small region of 540000 cells with
> > floating point values, and using the "feature=area" option to r.to.vect
> > I created a vector map of polygons.
>
> Hi Micha! I am curious about the 540.000 cells. This is _not_ really
> small, is it?
>
> > It produced over 360000 polygons.
>
> I wonder how long it took? For me a r.to.vect feature=point process with
> ~350.000 cells took more than 24 hours!
>
> Nikos
>
>
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