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Question regarding Lambert projection

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William.Hatheway

Active member
I found a little disconnect between the online tutorial PowerPoints and the users guide online.

Does Lambert projection true lat values need to be fixed at 30 and 60 degrees or can they vary?
 
William.Hatheway said:
I found a little disconnect between the online tutorial PowerPoints and the users guide online.

Does Lambert projection true lat values need to be fixed at 30 and 60 degrees or can they vary?
Click to expand...
I have been testing different configurations out and i don't see much of a difference but I could use some clarifying
 
William.Hatheway said:
I found a little disconnect between the online tutorial PowerPoints and the users guide online.

Does Lambert projection true lat values need to be fixed at 30 and 60 degrees or can they vary?
Click to expand...
No, truelat for lambert projection can be changed based on your specific domain setting. They don't have to be 30N and 60N.
 
Hi,

I’m setting up a WRF simulation with the Lambert Conformal projection, and I’m trying to determine the correct values for truelat1 and truelat2 in the namelist.input file. Could anyone explain how these values are derived based on the domain's geographic properties (e.g., central latitude and longitude, and the area of interest)?

Thanks in advance for your help!
 
Lambert projection is appropriate for mid-latitude region, for example over 20-60 latitude north and south. There is no strict rule how to specifiy truelat1 and truelat2. One can determine their values based on the domain location and size. Please take a look at the document here, which describes how it works in WRF.
 
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