+/**
+ * rad2deg:
+ * @rad: the angle in radians
+ *
+ * Convert radians to degrees
+ *
+ * Returns: the angle in degrees
+ */
+#define rad2deg(rad) (((rad)*180.0)/G_PI)
+
+
+/*************
+ * Datatypes *
+ *************/
+
+/* GisPoint */
+typedef struct _GisPoint GisPoint;
+struct _GisPoint {
+ gdouble lat, lon, elev;
+};
+
+void gis_point_set_lle(GisPoint *point,
+ gdouble lat, gdouble lon, gdouble elev);
+
+/* GisBounds */
+typedef struct _GisBounds GisBounds;
+struct _GisBounds {
+ gdouble n, s, e, w;
+};
+
+void gis_bounds_set_bounds(GisBounds *bounds,
+ gdouble n, gdouble s, gdouble e, gdouble w);
+
+
+/********
+ * Misc *
+ ********/
+/**
+ * FOV_DIST:
+ *
+ * Used by GisOpenGL to set up the drawing window
+ */