ardupilot/ArduCopter/terrain.cpp

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#include "Copter.h"
// update terrain data
void Copter::terrain_update()
{
#if AP_TERRAIN_AVAILABLE && AC_TERRAIN
terrain.update();
// tell the rangefinder our height, so it can go into power saving
// mode if available
#if RANGEFINDER_ENABLED == ENABLED
float height;
if (terrain.height_above_terrain(height, true)) {
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rangefinder.set_estimated_terrain_height(height);
}
#endif
#endif
}
// log terrain data - should be called at 1hz
void Copter::terrain_logging()
{
#if AP_TERRAIN_AVAILABLE && AC_TERRAIN
if (should_log(MASK_LOG_GPS)) {
terrain.log_terrain_data();
}
#endif
}
// should we use terrain data for things including the home altitude
bool Copter::terrain_use()
{
#if AP_TERRAIN_AVAILABLE && AC_TERRAIN
return (g.terrain_follow > 0);
#else
return false;
#endif
}