Temporal Coverage: 24 July 2012 - present (Day); 23 July 2012 - present (Night)
The AMSR-U2 Soil Moisture Normalized Polarization Difference layer indicates the amount of soil moisture over land masses in grams per cubic centimeters (g/cm3). This layer was constructed by using the Normalized Polarization Difference (NPD) algorithm using resampled brightness temperature data. The AMSR-E/AMSR2 Unified Level-2B land product provides a long-term data record by combining AMSR-E and AMSR2 data. The imagery resolution is 25 kilometers, and the temporal resolution is daily.
The Advanced Microwave Scanning Radiometer 2 (AMSR2) instrument provides global passive microwave measurements. It is a remote sensing instrument that measures weak microwave emissions from the surface and the atmosphere of the Earth. AMSR2 also provides microwave emission and scattering intensity measurements.
Temporal Coverage: 24 July 2012 - present (Day); 23 July 2012 - present (Night)
The AMSR-U2 Soil Moisture Single Channel Algorithm layer indicates the amount of soil moisture over land masses in grams per cubic centimeters (g/cm3). This layer was constructed by using the Single Channel Algorithm (SCA) using resampled brightness temperature data. The AMSR-E/AMSR2 Unified Level-2B land product provides a long-term data record by combining AMSR-E and AMSR2 data. The imagery resolution is 25 kilometers, and the temporal resolution is daily.
The Advanced Microwave Scanning Radiometer 2 (AMSR2) instrument provides global passive microwave measurements. It is a remote sensing instrument that measures weak microwave emissions from the surface and the atmosphere of the Earth. AMSR2 also provides microwave emission and scattering intensity measurements.
Data Product and References: NSIDC: AMSR-E/AMSR2 Unified L2B Half-Orbit 25 km EASE-Grid Surface Soil Moisture, Version 1; AMSR2 Global Soil Moisture Retrievals using the Normalized Polarization Difference (NPD) algorithm and Single Channel Algorithm (SCA) Algorithm Theoretical Basis Document
Temporal Coverage: 03 July 2012 - present
The Surface Soil Moisture C1-band (Day | Night, Daily) layer is from the AMSR2/GCOM-W1 surface soil moisture (LPRM) L3 1 day 25 km x 25 km ascending | descending V001 is a Level 3 (gridded) data set. Its land surface parameters, surface soil moisture, land surface (skin) temperature, and vegetation water content, are derived from passive microwave remote sensing data from the Advanced Microwave Scanning Radiometer 2 (AMSR2), using the Land Parameter Retrieval Model (LPRM). There are two files per day, one ascending (daytime) and one descending (nighttime), archived as two different products. This document is for the nighttime product. The data set covers the period from May 2012, when the Japan Aerospace Exploration Agency (JAXA) Global Change Observation Mission-1st Water GCOM-W1 satellite was launched, to the present.
The LPRM is based on a forward radiative transfer model to retrieve surface soil moisture and vegetation optical depth. The land surface temperature is derived separately from the AMSR2's Ka-band (36.5 GHz). A unique feature of this method is that it can be applied at any microwave frequency, making it very suitable to exploit all the available passive microwave data from various satellites.
Input data are from the AMSR2 spatial-resolution-matched brightness temperatures (L1SGRTBR) product, nighttime passes, as processed using LPRM (i.e., LPRM/AMSR2/GCOM-W1 Level 2 product, LPRM_AMSR2_SOILM2_V001).
References: doi:10.5067/M5DTR2QUYLS2; doi:10.5067/CGDEOBASZ178
Temporal Coverage: 03 July 2012 - present
The Surface Soil Moisture C1-band (Downscaled, Day | Night, Daily) layer is from the AMSR2/GCOM-W1 surface soil moisture (LPRM) L3 1 day 10 km x 10 km ascending | descending V001 is a Level 3 (gridded) data set. Its land surface parameters, surface soil moisture, land surface (skin) temperature, and vegetation water content, are derived from passive microwave remote sensing data from the Advanced Microwave Scanning Radiometer 2 (AMSR2), using the Land Parameter Retrieval Model (LPRM). There are two files per day, one ascending (daytime) and one descending (nighttime), archived as two different products. This document is for the daytime product. The data set covers the period from May 2012, when the Japan Aerospace Exploration Agency (JAXA) Global Change Observation Mission-1st Water GCOM-W1 satellite was launched, to the present.
The LPRM is based on a forward radiative transfer model to retrieve surface soil moisture and vegetation optical depth. The land surface temperature is derived separately from the AMSR2's Ka-band (36.5 GHz). A unique feature of this method is that it can be applied at any microwave frequency, making it very suitable to exploit all the available passive microwave data from various satellites.
Input data are from the AMSR2 spatial-resolution-matched brightness temperatures (L1SGRTBR) product, daytime passes, as processed using LPRM (i.e., LPRM/AMSR2/GCOM-W1 Downscaled Level 2 product, LPRM_AMSR2_DS_SOILM2_V001).
References: doi:10.5067/B0GHODHJLDA8; doi:10.5067/SITUTTDUKYZE