Retrieves a time series from the SATVEG service.
.sits_ts_from_satveg(longitude, latitude, name, prefilter)
The longitude of the chosen location.
The latitude of the chosen location.
Name of the desired coverage in SATVEG (see configuration file).
String ("0" - none, "1" - no data correction, "2" - cloud correction, "3" - no data and cloud correction)
TRUE if no problems are detected.