Dear Mahrez,

here are some.

Skill and Global Trend Analysis of Soil Moisture from Reanalyses and

Microwave Remote Sensing

http://journals.ametsoc.org/doi/pdf/10.1175/JHM-D-12-0161.1

Global Trends and Variability in Soil Moisture and Drought Characteristics, 1950–2000, from Observation-Driven Simulations of the Terrestrial Hydrologic Cycle

http://journals.ametsoc.org/doi/full/10.1175/2007JCLI1822.1

Climate Prediction Center global monthly soil moisture data set at 0.5_

resolution for 1948 to present (2000)

http://www.cpc.noaa.gov/products/Soilmst_Monitoring/Papers/2003JD004345.pdf

PSD Gridded Climate Datasets: All (Soil moisture among others)

http://www.esrl.noaa.gov/psd/data/gridded/

Best wishes, Kees 

Thank you C.J. Stigter ·  for your answer

You have many informed me

but I want to access at the data of map :

FIG. 1. Location of the in situ soil moisture stations used in this study (black dots) and ERA-Land mean soil moisture over the whole 1979–2010 period (filtered from snow covered areas).

 of the article : 

Skill and Global Trend Analysis of Soil Moisture from Reanalyses and Microwave Remote Sensing

http://journals.ametsoc.org/doi/pdf/10.1175/JHM-D-12-0161.1

Is that the data are available on the internet ?

Thank you

Dear Mahrez,

for example under the figure you see in the text:

http://www.wcc.nrcs.usda.gov/scan/

where you see a map of the North American stations.

These data are available.

Cheers, Kees