I have the following issue to solve:
There is a MODIS NDVI time series with 23 images for one year, named ndvi_01
to ndvi_23. Then i have a
raster with integer values from 1-23 representing the start of the growing
season (SOS), and the end (EOS), the values differ for each pixel. What i am
trying
* Martin_Brandt [2015-05-17 12:44:33 -0700]:
> I have the following issue to solve:
> There is a MODIS NDVI time series with 23 images for one year, named ndvi_01
> to ndvi_23. Then i have a
> raster with integer values from 1-23 representing the start of the growing
> season (SOS), and the end (
Hi Martin
According to the data you have, you may wanna register your ndvi maps
as relative time, and then:
# with this you select maps between dates pointed out in your sos and
eos maps and put null everywhere else
t.rast.mapcalc -n input=ndvi output=ndvi_sos_eos base=ndvi_sos_eos
expr="if(start
it works great and is amazingly fast, a comparable operation in R needs 30
minutes while it's done in GRASS in 20 seconds. There seems to be a great
potential of this new tool, thanks Veronica and Nikos!
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