src/Geo/AltitudeReference.hpp

   1 /* Copyright_License {
   2
   3   XCSoar Glide Computer - http://www.xcsoar.org/
   4   Copyright (C) 2000-2013 The XCSoar Project
   5   A detailed list of copyright holders can be found in the file "AUTHORS".
   6
   7   This program is free software; you can redistribute it and/or
   8   modify it under the terms of the GNU General Public License
   9   as published by the Free Software Foundation; either version 2
  10   of the License, or (at your option) any later version.
  11
  12   This program is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License for more details.
  16
  17   You should have received a copy of the GNU General Public License
  18   along with this program; if not, write to the Free Software
  19   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20 }
  21 */
  22
  23 #ifndef XCSOAR_ALTITUDE_REFERENCE_HPP
  24 #define XCSOAR_ALTITUDE_REFERENCE_HPP
  25
  26 #include <stdint.h>
  27
  28 /**
  29  * This enum specifies the reference for altitude specifications.
  30  */
  31 enum class AltitudeReference : int8_t {
  32   /**
  33    * No reference set, the altitude value is invalid.
  34    */
  35   NONE = -1,
  36
  37   /**
  38    * Altitude is measured above ground level (AGL).
  39    *
  40    * Note: the integer value is important because it is stored in the
  41    * profile.
  42    */
  43   AGL = 0,
  44
  45   /**
  46    * Altitude is measured above mean sea level (MSL).
  47    *
  48    * Note: the integer value is important because it is stored in the
  49    * profile.
  50    */
  51   MSL = 1,
  52
  53   /**
  54    * Altitude is measured above the standard pressure (1013.25 hPa).
  55    * This is used for flight levels (FL).
  56    */
  57   STD,
  58 };
  59
  60 #endif