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Changing land use classification system

This post was from a previous version of the WRF&MPAS-A Support Forum. New replies have been disabled and if you have follow up questions related to this post, then please start a new thread from the forum home page.


I'have been working with wrf v4. I found that by default my geogrid files have the Noah-modified 21-category IGBP-MODIS landuse classification system to determine the types of soil and so on.
Nevertheless, I have to work with 27-class USGS or 20-class MODIS. I'm not familiar with this systems or their differences, but from the tables I found online, they do have different assignations. How is this selected? In the technical description of wrf I found they changed some variables in the namelist.wps but I don't really understand what they do.
This is more or less the same question as in these three other posts:

Please do not create multiple posts about this same issue, as it can potentially lead to duplicated efforts by different people in trying to answer your questions.
Hi Jana,
Regarding how these different landuse classifications are selected, please see Chapter 3 of the WRF User's Guide. As for the difference between the datasets, you likely will need to refer to the groups that support/manage the data for detailed information. We have some information available in this FAQ, but you may have to do a bit of searching for additional information, as that is not something that's available to us. I apologize for the inconvenience.