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How to get Horizontal Infrared Radiation Intensity or Opaque Sky Cover?

I am trying to create my own EPW file for the first half of 2021.

I have all variables except for Horizontal Infrared Radiation Intensity or Opaque Sky Cover (I need at least one to complete my file).

Is there any method I can use to derive either variable? Or is there a satellite, bureau of meteorology database etc anyone is aware of that I could source this data from?

Thank you for any help you can provide.

How to get Horizontal Infrared Radiation Intensity or Opaque Sky Cover?

I am trying to create my own EPW file for the first half of 2021.

I have all variables except for Horizontal Infrared Radiation Intensity or Opaque Sky Cover (I need at least one to complete my file).

Is there any method I can use to derive either variable? Or is there a satellite, bureau of meteorology database etc anyone is aware of that I could source this data from?

Thank you for any help you can provide.

How to get Horizontal Infrared Radiation Intensity or Opaque Sky Cover?

I am trying to create my own EPW file for the first half of 2021.

I have all variables except for Horizontal Infrared Radiation Intensity or Opaque Sky Cover (I need at least one to complete my file).

Is there any method I can use to derive either variable? Or is there a satellite, bureau of meteorology database etc anyone is aware of that I could source this data from?

Thank you for any help you can provide.