interpMODIS: interpolate MODIS band data to provide values at a given set...

In Timothy-W-Hilton/VPRMLandSfcModel: R implementation of VPRM with parameter estimation

interpolate MODIS band data to provide values at a given set of dates

Description

interpolate MODIS band data to provide values at a given set of dates using either linear or constant interpolation.

Usage

interpMODIS(mod_date, mod_val, out_date, method)

Arguments

mod_date	chron vector; MODIS Time stamp
mod_val	MODIS values
out_date	chron vector; the dates for the output
method	string, either "linear" or "constant"

Value

list with components "date" and "val", containing timestamps (class chron) and values (class is dependent on the MODIS product) of the interpolated data.

Author(s)

Timothy W. Hilton

Examples

data(Park_Falls)
interpolated_EVI <- interpMODIS(mod_date=PFa_evi[['date']],
                                mod_val=PFa_evi[['evi']],
                                out_date=PFa_tower_obs[['date']],
                                method='linear')
plot(interpolated_EVI[['date']], interpolated_EVI[['val']],
     type='l', lty='dashed', 
     xlab='date', ylab='EVI', main='Park Falls')
with(PFa_evi, points(date, evi, pch='*', cex=2.0, col='red'))
legend( x='topright',
       legend=c('observed', 'interpolated'),
       pch=c('*', NULL),
       col=c('red', 'black'),
       lty=c('blank', 'dashed'),
       pt.cex=c(2.0, 1.0))

Timothy-W-Hilton/VPRMLandSfcModel documentation built on Nov. 17, 2024, 1:56 p.m.