WRF - Developmental Testbed Center

1. PROJECTION : A character string specifying the projection of the data, which may beeither lambert, polar, mercator, regular_ll, albers_nad83, or polar_wgs84. Nodefault value.2. TYPE : A character string, either categorical or continuous, that determineswhether the data in the data files should be interpreted as a continuous field or as discreteindices. For categorical data represented by a fractional field for each possible category,type should be set to continuous. No default value.3. SIGNED : Either yes or no, indicating whether the values in the data files (which arealways represented as integers) are signed in two's complement form or not. Defaultvalue is no.4. UNITS : A character string, enclosed in quotation marks ("), specifying the units of theinterpolated field; the string will be written to the geogrid output files as a variable timeindependentattribute. No default value.5. DESCRIPTION : A character string, enclosed in quotation marks ("), giving a shortdescription of the interpolated field; the string will be written to the geogrid output filesas a variable time-independent attribute. No default value.6. DX : A real value giving the grid spacing in the x-direction of the data set. Ifprojection is one of lambert, polar, mercator, albers_nad83, or polar_wgs84, dxgives the grid spacing in meters; if projection is regular_ll, dx gives the grid spacingin degrees. No default value.7. DY : A real value giving the grid spacing in the y-direction of the data set. Ifprojection is one of lambert, polar, mercator, albers_nad83, or polar_wgs84, dygives the grid spacing in meters; if projection is regular_ll, dy gives the grid spacingin degrees. No default value.8. KNOWN_X : A real value specifying the i-coordinate of an (i,j) locationcorresponding to a (latitude, longitude) location that is known in the projection. Defaultvalue is 1.9. KNOWN_Y : A real value specifying the j-coordinate of an (i,j) locationcorresponding to a (latitude, longitude) location that is known in the projection. Defaultvalue is 1.10. KNOWN_LAT : A real value specifying the latitude of a (latitude, longitude)location that is known in the projection. No default value.11. KNOWN_LON : A real value specifying the longitude of a (latitude, longitude)location that is known in the projection. No default value.WRF-NMM V3: User’s Guide 3-41