@mark-mansfield I think it means thousands (of feet) altitude.I think

I am happy to see the new solar power data, but I am confused about what it represents. In looking at your ECMWF-sourced data, for a sunny day in my area, in two locations separated by 10 miles, the difference in forecast solar power noon, about 830 W/m^2 in both places, even though one had 85% cloud cover (mostly low, some medium), and the other had 0% cloud cover.
The information circled-i indicates that the data is similar to what a pyranometer would register, though at a certain point of measurement, perhaps.
I guess I didnt expect that to mean you wouldnt adjust for relative cloud cover between the measurement site and the map coordinate?
My apologies if I am making an error here. Thanks.

@mark-mansfield I think it means thousands (of feet) altitude.I think