Soil moisture datasets at various scales are
needed for sustainable land use and water management. The aim of
this study was to compare soil moisture ocean salinity satellite and
in situ soil moisture data for the Podlasie and Polesie regions in
Eastern Poland. Both regions have similar climatic and topo-
graphic conditions but are different in land use, vegetation, and soil
cover. The test sites were located on agricultural fields on sandy
soils and natural vegetation on marshy soils that prevail in the
Podlasie and Polesie regions, respectively. The soil moisture ocean
salinity soil moisture data were obtained from radiometric
measurements (1.4 GHz) and the ground soil moisture from
sensors at a depth of 5 cm during the years 2010-2011. In general,
temporal patterns of soil moisture from both satellite and ground
measurements followed the rainfall trend. The regression coeffi-
cients, Bland-Altman analysis, concordance correlation coefficient,
and total deviation index showed that the agreement between
ground and soil moisture ocean salinity derived soil moisture data
is better for the Podlasie than the Polesie region. The lower agre-
ement in Polesie was attributed mostly to the presence of the
widespread natural vegetation on the wetter marsh soil along with
minor contribution of agriculturally used drier coarse-textured soils.
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