Re: [R-sig-Geo] Supervised landscape classification according to NDVI time series

2011-06-21 Thread Martin
This is indeed an interesting topic. Robert's method may work if you average the months over serveral years, e.g. an average january over 5-10 years may not be influenced too much by seasonality... But if you find a method which works better i think some would be interested if you post your results

Re: [R-sig-Geo] Supervised landscape classification according to NDVI time series

2011-06-15 Thread Robert Hijmans
> From what I understood, most landscape classification methods available > from GRASS (through R) do not account for the temporaI aspect of > spectrum. So for example, if you have a raster where each band > represents NDVI values at a given date, from March to September for > example, the clas

Re: [R-sig-Geo] Supervised landscape classification according to NDVI time series

2011-06-13 Thread Edzer Pebesma
On 06/13/2011 03:37 PM, Christopher Fusting wrote: > Second, have a look at the CRAN 'spacetime' package for R. Although this > will not solve your query, it may offer a different perspective. Looking at packages is always good advice. There was also some discussion at https://stat.ethz.ch/pip

[R-sig-Geo] Supervised landscape classification according to NDVI time series

2011-06-11 Thread Alexandre Villers
Hey, From what I understood, most landscape classification methods available from GRASS (through R) do not account for the temporaI aspect of spectrum. So for example, if you have a raster where each band represents NDVI values at a given date, from March to September for example, the classif