#### catalinaporaicu

##### New member

Hello,

I am trying to figure out the exact projection of my geogrid output. I have attached my namelist.wps file below. However, this information is not sufficient, and I would like to know the exact ellipsoid shape that WRF uses.

Perhaps if I explain what I am trying to do with WRF/WRF-Chem, my question will be more clear. Essentially, I am trying to complete some WRF runs in the exact same projection as some input data, which will later be used in the WRF-Chem anthropogenic emissions preprocessor. I do not wish to manipulate this data, as I would like it to contain as much of the original information as possible, so I am trying to alter the WRF grid so that it is identical to the data projection. The projection of my data is (taken from the shapefile of my data, in QGIS):

+proj=lcc +lat_1=50.85 +lat_2=50.85 +lat_0=50.85 +lon_0=3.67 +x_0=0 +y_0=0 +ellps=intl +towgs84=-106.869,52.2978,-103.724,0.3366,-0.457,1.8422,-1.2747 +units=m +no_defs

As you can see, the ellipse used by my data projection is international, and there is a datum transformation to WGS84.

I was wondering if there is a solution within the WRF or WPS namelists to give more information to the projection? Or perhaps the code can be altered in some way to input my options? Any help is very appreciated!

Thanks in advance.

I am trying to figure out the exact projection of my geogrid output. I have attached my namelist.wps file below. However, this information is not sufficient, and I would like to know the exact ellipsoid shape that WRF uses.

Perhaps if I explain what I am trying to do with WRF/WRF-Chem, my question will be more clear. Essentially, I am trying to complete some WRF runs in the exact same projection as some input data, which will later be used in the WRF-Chem anthropogenic emissions preprocessor. I do not wish to manipulate this data, as I would like it to contain as much of the original information as possible, so I am trying to alter the WRF grid so that it is identical to the data projection. The projection of my data is (taken from the shapefile of my data, in QGIS):

+proj=lcc +lat_1=50.85 +lat_2=50.85 +lat_0=50.85 +lon_0=3.67 +x_0=0 +y_0=0 +ellps=intl +towgs84=-106.869,52.2978,-103.724,0.3366,-0.457,1.8422,-1.2747 +units=m +no_defs

As you can see, the ellipse used by my data projection is international, and there is a datum transformation to WGS84.

I was wondering if there is a solution within the WRF or WPS namelists to give more information to the projection? Or perhaps the code can be altered in some way to input my options? Any help is very appreciated!

Thanks in advance.