For 2-m temp or 10-m wind, the height is relative to soil or canopy surface?

Datasets and Usage C3S - Datasets and Usage
1

The “height” in ERA5 definition refers to “above the surface of land or Earth”.
The land surface refers to soil surface or canopy surface?
Does anyone know where to find these information?

Many thanks.

2

Hi,
please have a look at the following link: ERA5: data documentation - Copernicus Knowledge Base - ECMWF Confluence Wiki

Thanks

3

Many thanks. I’m clear now.