Articles | Volume 24, issue 4
Hydrol. Earth Syst. Sci., 24, 1957–1973, 2020
Hydrol. Earth Syst. Sci., 24, 1957–1973, 2020

Research article 17 Apr 2020

Research article | 17 Apr 2020

Required sampling density of ground-based soil moisture and brightness temperature observations for calibration and validation of L-band satellite observations based on a virtual reality

Shaoning Lv et al.

Data sets

Virtual catchment simulation based on the Neckar region version 1 B. Schalge, G. Baroni, B. Haese, D. Erdal, G. Geppert, P. Saavedra, V. Haefliger, H. Vereecken, S. Attinger, H. Kunstmann, O. A. Cirpka, F. Ament, S. Kollet, I. Neuweiler, H.-J. Hendricks Franssen, and C. Simmer

Short summary
Passive remote sensing of soil moisture has good potential to improve weather forecasting via data assimilation in theory. We use the virtual reality data set (VR01) to infer the impact of sampling density on soil moisture ground cal/val activity. It shows how the sampling error is growing with an increasing sampling distance for a SMOS–SMAP scale footprint in about 40 km, 9 km, and 3 km. The conclusion will help in understanding the passive remote sensing soil moisture products.