Hi
I want to know what is the unit of Soil_wetness_tx
in SNAP its shown as a ‘m’. but I don’t know its meaning.
Those tie-point grids are included by ESA in the Sentinel-3 SLSTR LST products.
The data is obtained from ECMWF.
I can’t really say what meter means in this context.
I just guess that a value of 0.35m means that down to this depth there is a certain level of moisture.
Here some links I found
- https://sentinel.esa.int/documents/247904/1872792/Sentinel-3-SLSTR-Product-Data-Format-Specification-Level-1
- https://confluence.ecmwf.int/display/COPSRV/Soil+wetness+index+calculation
But non explains the value explicitly.
Hi and thanks Mr @marpet. I found these sites. but I really confused, in properties of soil_wetness_tx band, it is told that this band means “Volumetric Soil Water Layer 1”
I found it in ECMWF:
But two contradictions were found:
- Unit of it: m3 m-3
- short name of it: swvl1
I don’t think it means the depth, because they described that: Soil wetness (level 1) “moisture_content_of_soil_layer”
but I found it: https://apps.ecmwf.int/codes/grib/param-db?id=140
Do you think this unit is correct? Meters is equivalent to water?
I really don’t know. But I pass your question to someone at ESA.
Maybe someone from the Sentinel-3 team can help.
I just found this page.
http://www.fao.org/3/r4082e/r4082e03.htm#2.3%20soil%20moisture%20conditions
Probably this gives more insights.