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# Example of the WTSS package
#
# Retrieve an MOD13Q1 NDVI time series for a location in Brazilian Amazonia
#
# Apply the Changepoint package to dectect breaks
#
# installing and loading packages
library(changepoint)
library(wtss)
# create a connection using a serverUrl
server <- wtss::WTSS("http://www.esensing.dpi.inpe.br/wtss/")
# get the list of coverages provided by the service
coverages <- wtss::list_coverages(server)
# get the description of the MOD13Q1 coverage
cv <- describe_coverage(server, "MOD13Q1")
# Get a time seriesfor the "ndvi" attribute
ndvi <- wtss::time_series(server, "MOD13Q1", attributes=c("ndvi"),
latitude=-10.408, longitude=-53.495,
start="2000-02-18", end="2016-01-01")
# transform time series to the TS format
ndvi_ts <- wtss::wtss_to_ts(ndvi)
# break point detection analysis
cpt_meanvar = changepoint::cpt.meanvar(ndvi_ts)
# break point in a line plot
plot(cpt_meanvar)
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