[GRASS-dev] spline interpolation over time series

Margherita Di Leo dileomargherita at gmail.com
Sun Jun 16 13:20:07 PDT 2013


On Sun, Jun 16, 2013 at 9:19 PM, Markus Metz
<markus.metz.giswork at gmail.com>wrote:

> On Sun, Jun 16, 2013 at 8:50 PM, Sören Gebbert
> <soerengebbert at googlemail.com> wrote:
> > Hi,
> > 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()"
> etc, then
> r.hants
> in=tseries.1,tseries.2,tseries.3,tseries.4,tseries.5,tseries.6,tseries.7,tseries.8,tseries.9
> with the appropriate filtering options.
> Thank you for all your inputs. Actually what I should do is not a proper
interpolation but a regression, and analysis of quantiles. I'll study the
modules you suggested to see either if I can add such a feature or I would
need to write something from scratch.


Best regards,

Margherita DI LEO
Postdoctoral Researcher

European Commission - DG JRC
Institute for Environment and Sustainability (IES)
Via Fermi, 2749
I-21027 Ispra (VA) - Italy - TP 261

Tel. +39 0332 78 3600
margherita.di-leo at jrc.ec.europa.eu

Disclaimer: The views expressed are purely those of the writer and may not
in any circumstance be regarded as stating an official position of the
European Commission.
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