In Tableau. This map was created with latitude generated and longitude generated. I tried to create calc fields to define the $4$ regions but got error operation is not permitted. I want the map to display the four regions with color identified on the legend so it sregion can display number of diseases. Because of prior answers I tried IF $[$Latitude$]>=35$ AND $[$Longitude THEN "Southeast"

ELSEIF $[$Latitude$]>=35$ AND $[$Longitude$]>-90$ THEN "Northeast"

ELSEIF $[$Latitude$]<mtext\; id="EditorElement\_806967"></mtext><mn\; id="EditorElement\_806968">3</mn><mn\; id="EditorElement\_806969">5</mn>$ AND $[$Longitude THEN "Southwest"

ELSE "Northwest"

END

But received error undefined filed Latitude and Longitude