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Plane: use terrain extrapolation 

use best effort extrapolation if we run out of terrain data
This commit is contained in:
Andrew Tridgell 2014-08-06 11:44:06 +10:00
parent 147a7b8b69
commit 781c5bc5dd
1 changed files with 7 additions and 8 deletions
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15
ArduPlane/altitude.pde
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@ -137,7 +137,7 @@ static void set_target_altitude_current(void)
#if AP_TERRAIN_AVAILABLE
// also record the terrain altitude if possible
float terrain_altitude;
if (g.terrain_follow && terrain.height_above_terrain(current_loc, terrain_altitude)) {
if (g.terrain_follow && terrain.height_above_terrain(terrain_altitude, true)) {
target_altitude.terrain_following = true;
target_altitude.terrain_alt_cm = terrain_altitude*100;
} else {
@ -176,7 +176,7 @@ static void set_target_altitude_location(const Location &loc)
terrain altitude
*/
float height;
if (loc.flags.terrain_alt && terrain.height_above_terrain(current_loc, height)) {
if (loc.flags.terrain_alt && terrain.height_above_terrain(height, true)) {
target_altitude.terrain_following = true;
target_altitude.terrain_alt_cm = loc.alt;
if (!loc.flags.relative_alt) {
@ -198,9 +198,8 @@ static int32_t relative_target_altitude_cm(void)
#if AP_TERRAIN_AVAILABLE
float relative_home_height;
if (target_altitude.terrain_following &&
terrain.height_relative_home_equivalent(current_loc,
target_altitude.terrain_alt_cm*0.01f,
relative_home_height)) {
terrain.height_relative_home_equivalent(target_altitude.terrain_alt_cm*0.01f,
relative_home_height, true)) {
// we are following terrain, and have terrain data for the
// current location. Use it.
return relative_home_height*100;
@ -262,7 +261,7 @@ static int32_t calc_altitude_error_cm(void)
#if AP_TERRAIN_AVAILABLE
float terrain_height;
if (target_altitude.terrain_following &&
terrain.height_above_terrain(current_loc, terrain_height)) {
terrain.height_above_terrain(terrain_height, true)) {
return target_altitude.terrain_alt_cm - (terrain_height*100);
}
#endif
@ -320,7 +319,7 @@ static void set_offset_altitude_location(const Location &loc)
float height;
if (loc.flags.terrain_alt &&
target_altitude.terrain_following &&
terrain.height_above_terrain(current_loc, height)) {
terrain.height_above_terrain(height, true)) {
target_altitude.offset_cm = target_altitude.terrain_alt_cm - (height * 100);
}
#endif
@ -357,7 +356,7 @@ static bool above_location_current(const Location &loc)
#if AP_TERRAIN_AVAILABLE
float terrain_alt;
if (loc.flags.terrain_alt &&
terrain.height_above_terrain(current_loc, terrain_alt)) {
terrain.height_above_terrain(terrain_alt, true)) {
float loc_alt = loc.alt*0.01f;
if (!loc.flags.relative_alt) {
loc_alt -= home.alt*0.01f;