Early SMAP soil moisture product validation over Australia using cosmic-ray probes

A. Monerris, D. McJannet, C. Rüdiger, J.P. Walker, S. Chan, A. Colliander, N. N. Das, S. Kim

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review


NASA's Soil Moisture Active Passive (SMAP) mission was launched in January 2015 carrying two instruments on-board: an L-band radar and an L-band radiometer. This satellite will soon provide global measurements of surface soil moisture as well as of freeze/thaw state at three different spatial resolutions: 36 km (radiometer only product, higher soil moisture accuracy but coarser resolution), 3 km (radar only product, less accurate soil moisture but higher resolution), and 9 km (combined radar-radiometer product). In this study, the early SMAP soil moisture products at those different spatial resolutions are validated against area-averaged soil moisture measurements from cosmic ray probes (CRP) from the Australian CRP network (known as CosmOz, cosmoz.csiro.au). The main focus area will be a semi-arid grassland in the region of Yanco (New South Wales, Australia) which is one of the core SMAP validation sites worldwide, and is supported by in-situ point observations from several OzNet soil moisture monitoring stations (www.oznet.org.au) as well as one CRP system. With this set-up, the spatial relationship of the soil moisture as observed by the CRP with the surrounding environment can be captured and provides an insight into the spatial representativeness of the CRP measurements themselves. The comparison is extended to different CosmOz systems across Australia to assess the performance of early SMAP soil moisture products under varying land cover, soil type and climate conditions.

Original languageEnglish
Title of host publication 36th Hydrology and Water Resources Symposium
Subtitle of host publicationThe Art and Science of Water
Place of PublicationNorth Melbourne VIC Australia
PublisherEngineers Australia
Number of pages6
ISBN (Print)9781922107497
Publication statusPublished - 2015
EventHydrology and Water Resources Symposium 2015 - Grand Chancellor, Hobart, Australia
Duration: 7 Dec 201510 Dec 2015
Conference number: 36th


ConferenceHydrology and Water Resources Symposium 2015
Abbreviated titleHWRS 2015
Other36th Hydrology and Water Resources Symposium (HWRS 2015)
Internet address

Cite this