Nikos Alexandris:
is there a GRASS-native, of GRASS-friendly, practical tool or tutorial
or implementation of models, as in the TIMESAT [0] software or SPIRITS
[1], to exctract phenological parameters from NDVI (or, preferrably
EVI2) times series?
Thank you, Nikos
[0] http://web.nateko.lu.se/timesat/timesat.asp
[1] http://spirits.jrc.ec.europa.eu/download/software/
Sajid Pareeth:
I was also looking for the same functionalities very recently. Closest
solution i could find is the 'greenbrown' package in R. Atleast we could
make use of the GRASS-R interface to implement the work flow.
Phenology function in this package has a good comprehensive list of
functions as in timestat and spirits.
See fig4 here: http://greenbrown.r-forge.r-project.org/phenology.php
If you find anything else, please do post here.
And above all, it would be really great to have these functionalities in
GRASS ;)
Thank you Sajid.
As I am not an expert in cropping cycles monitoring, I
naively thought there would be more or less some ready to use tools in
the GFOSS domain (TIMESAT requires Matlab, SPIRITS works only under
Windows).
R is good, but there is still the back-and-forth step. There is also a
"french" tool for QGIS:
https://plugins.qgis.org/plugins/VERSAO_VegaMonitor/
At the moment I am looking for an over-simplified way to just
hint/classify surfaces on which multiple cropping cycles per year take
place (related to industrial agricultural surfaces). Something to get
going.
Given TGRASS, if we find a practical algorithm, it shouldn't be too hard
to implement it GRASS-natively.
Nikos
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