WRF - Developmental Testbed Center

Note: For the WRF-NMM the variables i_parent_start, j_parent_start, s_we, e_we, s_sn,and e_sn are ignored during the WPS processing because the higher resolution staticfiles for each nest level are created for the entire coarse domain. These variables,however, are used when running the WRF-NMM model.Finally, for each nest, the resolution of source data to interpolate from is specified withthe geog_data_res variable.For a complete description of these namelist variables, the user is referred to thedescription of namelist variables.Selecting Between USGS and MODIS-based Land Use ClassificationsBy default, the geogrid program will interpolate land use categories from USGS 24-category data. However, the user may select an alternative set of land use categoriesbased on the MODIS land-cover classification of the International Geosphere-BiosphereProgramme and modified for the Noah land surface model. Although the MODIS-baseddata contain 20 categories of land use, these categories are not a subset of the 24 USGSWRF-NMM V3: User’s Guide 3-15