Description Usage Arguments Details Value Author(s) References See Also
Compute a stepwise regression of vegetation index over aridity index and year order-number. As many points as available hydrological years are made from annual means of these variables, which are first computed from their respective time-series. The results are then saved to corresponding raster files. A batch operation is parameterised from the r2dRue current memory settings (see read2dRfile and showInfo). Rudimentary bars show the computation in progress.
1 | monitoring(o)
|
o |
A r2dRue Object |
The following r2dRue functions are involved in this computation. Local parameters are left with their respective default values, except those specified in the parameters file as displayed by showInfo:
The following raster files are created resulting from the monitoring operation. They belong to the SpatialGridDataFrame class
index |
individual label for each grid cell |
effect_time |
rate of change in std.dev. of vegetation index per one std.dev. of time; zero if non significant |
effect_arid |
rate of change in std.dev. of vegetation index per one std.dev. of aridity; zero if non significant |
veg_response |
significant response of vegetation index to time (1), aridity (2), both (3) or none (4) |
ta_single |
single correlation coefficient of time and aridity; zero if non significant |
tv_single |
single correlation coefficient of time and vegetation index; zero if non significant |
av_single |
single correlation coefficient of aridity and vegetation index; zero if non significant |
viMe yyyy |
mean annual vegetation index corresponding to year yyyy |
aiMeyyyy |
mean annual aridity index corresponding to year yyyy |
timeyyyy |
dummy raster containing year yyyy in each grid cell |
Gabriel del Barrio, Marieta SanJuan & Alberto Ruiz
del Barrio, G., Puigdefabregas, J. Sanjuan, M.E., Stellmes, M. & Ruiz, A. (2010). Assessment and monitoring of land condition in the Iberian Peninsula, 1989-2000. Remote Sensing of Environment, 114: 1817-1832 http://dx.doi.org/10.1016/j.rse.2010.03.009
Sokal, R. R., & Rohlf, F. J. (1995). Biometry. New York: W.H. Freeman and Co.
regStepRaster
, editr2dRfile
, readr2dRfile
, showInfo
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