-void gis_view_set_location(GisView *view, gdouble x, gdouble y, gdouble z);
-void gis_view_get_location(GisView *view, gdouble *x, gdouble *y, gdouble *z);
-void gis_view_pan (GisView *view, gdouble x, gdouble y, gdouble z);
+void gis_view_set_location(GisView *view, gdouble lat, gdouble lon, gdouble elev);
+void gis_view_get_location(GisView *view, gdouble *lat, gdouble *lon, gdouble *elev);
+void gis_view_pan (GisView *view, gdouble lat, gdouble lon, gdouble elev);