ao-tools/lib: Add atmosphere model

Converts between pressure and altitude

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/ao-tools/lib/ao-atmosphere.h b/ao-tools/lib/ao-atmosphere.h
new file mode 100644
index 00000000..0a24cb02
--- /dev/null
+++ b/ao-tools/lib/ao-atmosphere.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright © 2019 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#ifndef _AO_ATMOSPHERE_H_
+#define _AO_ATMOSPHERE_H_
+
+double
+ao_altitude_to_pressure(double altitude);
+
+double
+ao_pressure_to_altitude(double pressure);
+
+#endif /* _AO_ATMOSPHERE_H_ */