Estimates of the aerodynamic roughness lengths z 0 in arid and semi-arid regions are for the first time provided for the whole globe, using satellite ERS scatterometer observations. A statistical relationship is derived between the ERS scatterometer backscattering coefficients and quality in situ and geomorphological z 0 estimates. It is a practical solution to provide realistic roughness maps with large-scale spatial patterns that are consistent with independent surface characterization. In addition, it …
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