Added apt.dat to groundnet / twr/ threshold / ils.xml files converter, made STG object elevation recalculator accept whole directory structures as input

utils/geo.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+#-*- coding:utf-8 -*-
+
+import math
+
+from fgtools.utils import wrap_period
+
+EARTH_RADIUS = 6378138.12
+
+def great_circle_distance_m(lon1, lat1, lon2, lat2):
+	lon1, lat1, lon2, lat2 = map(math.radians, (lon1, lat1, lon2, lat2))
+	return abs(EARTH_RADIUS * math.acos(math.sin(lat1) * math.sin(lat2) + math.cos(lat1) * math.cos(lat2) * math.cos(lon1 - lon2)))
+
+def great_circle_distance_km(lon1, lat1, lon2, lat2):
+	return great_circle_distance_m(lon1, lat1, lon2, lat2) / 1000
+
+def get_bearing_deg(lon1, lat1, lon2, lat2):
+	dlon = (lon2 - lon1)
+	x = math.cos(math.radians(lat2)) * math.sin(math.radians(dlon))
+	y = math.cos(math.radians(lat1)) * math.sin(math.radians(lat2)) - math.sin(math.radians(lat1)) * math.cos(math.radians(lat2)) * math.cos(math.radians(dlon))
+	brg = math.atan2(x, y)
+	brg = math.degrees(brg)
+
+	return wrap_period(brg, 0, 360)
+
+def apply_heading_distance(lon, lat, heading, distance):
+	lon = math.radians(lon)
+	lat = math.radians(lat)
+	heading = math.radians(heading)
+	distance /= EARTH_RADIUS
+
+	if distance < 0:
+		distance = abs(distance)
+		heading -= math.pi
+
+	lat = math.asin(math.sin(lat) * math.cos(distance) + math.cos(lat) * math.sin(distance) * math.cos(heading))
+
+	if math.cos(lat) > 1e-15:
+		lon = math.pi - (math.pi - lon - math.asin(math.sin(heading) * math.sin(distance) / math.cos(lat)) % (2 * math.pi))
+	
+	return wrap_period(math.degrees(lon), -180, 180), wrap_period(math.degrees(lat), -90, 90)
+