change bathy to landseamask

rita.c

@@ -178,7 +178,7 @@ int main(int argc, char *argv[]){
 
     struct Colort *scolor = NULL;
 
-    get2dfield_binary("bathy.bin",&FLD);
+    get2dfield_binary("landseamask.bin",&FLD);
 
     struct Vis visu       = init_x(width,height);
     struct dsp_field dspf = adjusttowindowsize(&visu, &FLD);