Goal: My goal is to compare remote sensing no2 emission to bottom-up no2 emission for electricity generation.
I have calculated the total yearly emission of no2 for California. The data used for this is Sentinel-5p OFFL NO2 stored in Google Earth Engine. I first take the yearly sum of no2 (tropospheric_NO2_column_number_density) and use gee
reduceRegion function to get a sum of yearly no2 of California.
I want to compare that value with EPA emission data which contain yearly statewide emission data. But the problem is
tropospheric_NO2_column_number_density unit is
mol/m^2 and EPA emission data in
ton or lb.
Question: So how to compare these two value of the different units?
After searching I found this post in sentinel-5p forum which discusses converting
mol/m^2 to ppb. But this doesn't solve my problem.
EDIT: After seeing @xunilk detailed answer, I came to know we can convert
lb/m^2 and my question needs some clarification. If we convert and sum entire year no2 of a state then our final value's unit will be
lb/m^2. For example, California yearly total no2 emission from s5p satellite is
104 lb/m^2. On the other hand, our bottom-up emission data describes that California yearly emission is
30000 ton. So how can we convert this
lb/m^2 value to only
ton ( not ton/m^2 ) and also how to convert
lb (not lb/m^2)? Could we just multiply the entire California area in
m^2 or is there any way to do that in satellite imagery?