[GRASS-dev] spline interpolation over time series
markus.metz.giswork at gmail.com
Sun Jun 16 12:19:41 PDT 2013
On Sun, Jun 16, 2013 at 8:50 PM, Sören Gebbert
<soerengebbert at googlemail.com> wrote:
> Nikos is absolutely right, the ideal candidate for spline interpolation in
> time for raster maps is r.series.interp. There is no other module that
> performs temporal interpolation.
r.hants does temporal interpolation, to a degree. Assuming you have
e.g the raster maps tseries.1, tseries.3, tseries.5, tseries.7,
tseries.9, you could create dummy tseries maps tseries.2, tseries.4,
tseries.6, tseries.7 with
r.mapcalc "tseries.2 = null()"
with the appropriate filtering options.
> Best regards
> 2013/6/16 Nikos Alexandris <nik at nikosalexandris.net>
>> Margherita Di Leo wrote:
>> > Hi all!
>> > I need to analyse several MODIS in time, and calculate the temporal
>> > spline
>> > interpolation (for each pixel), then pick the values (date and value) on
>> > the spline function corresponding to percentiles 25, 50, 75, maximum,
>> > minimum and average.
>> > I know that with r.series I can get max, min and average, but I can't
>> > currently apply a spline interpolation. I'd like to know if in the
>> > temporal
>> > modules there's something to do that or I should hack the r.series in
>> > order
>> > to add the spline interpolation.
>> Maybe r.series.interp is a good/the proper candidate to receive such an
>> > I found this
>> > http://docs.scipy.org/doc/scipy/reference/tutorial/interpolate.html#spline-i
>> > nterpolation that
>> > I can probably use for the scope.
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