ISMN quality flags
WE DO NOT ERASE DATA - WE FLAG (see Dorigo et. al 2013 or https://ismn.earth/en/data/flag-overview/).
ISMN quality flags are tags stored in our database with each observation. When the ISMN automated quality control detects a dubious soil moisture (or other variable) observation it is marked as "C01-C03" or "D01-D10", which signify different flagging methods. See below for example content of a data-file downloaded from ISMN.
date |
value |
quality flag |
origflag (Provider) |
| 2017/04/19 00:00 | 0.2420 | D03 | M |
| 2017/04/19 01:00 | 0.2450 | D03 | M |
| 2017/04/19 02:00 | 0.4070 | D03,D10 | M |
| 2017/04/19 03:00 | 0.4070 | D03,D10 | M |
| 2017/04/19 04:00 | 0.4070 | D03,D10 | M |
| 2017/04/19 05:00 | 0.4070 | D03,D10 | M |
| 2017/04/19 06:00 | 0.3040 | G | M |
Example of a data file downloaded through the ISMN.
Observations not detected as dubious are marked "G" (good) in the qflag column. "M" (missing) in the origflag column means there is no flag entry from the provider.
