ardupilot/libraries/AP_Math/location.h

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#pragma once
#include <inttypes.h>
#include <AP_Common/AP_Common.h>
#include <AP_HAL/AP_HAL.h>
#include "vector2.h"
#include "vector3.h"
// scaling factor from 1e-7 degrees to meters at equater
// == 1.0e-7 * DEG_TO_RAD * RADIUS_OF_EARTH
#define LOCATION_SCALING_FACTOR 0.011131884502145034f
// inverse of LOCATION_SCALING_FACTOR
#define LOCATION_SCALING_FACTOR_INV 89.83204953368922f
/*
* LOCATION
*/
// longitude_scale - returns the scaler to compensate for shrinking longitude as you move north or south from the equator
// Note: this does not include the scaling to convert longitude/latitude points to meters or centimeters
float longitude_scale(const struct Location &loc);
// return distance in meters between two locations
float get_distance(const struct Location &loc1, const struct Location &loc2);
// return distance in centimeters between two locations
uint32_t get_distance_cm(const struct Location &loc1, const struct Location &loc2);
// return bearing in centi-degrees between two locations
int32_t get_bearing_cd(const struct Location &loc1, const struct Location &loc2);
// see if location is past a line perpendicular to
// the line between point1 and point2. If point1 is
// our previous waypoint and point2 is our target waypoint
// then this function returns true if we have flown past
// the target waypoint
bool location_passed_point(const struct Location & location,
const struct Location & point1,
const struct Location & point2);
/*
return the proportion we are along the path from point1 to
point2. This will be less than >1 if we have passed point2
*/
float location_path_proportion(const struct Location &location,
const struct Location &point1,
const struct Location &point2);
// extrapolate latitude/longitude given bearing and distance
void location_update(struct Location &loc, float bearing, float distance);
// extrapolate latitude/longitude given distances north and east
void location_offset(struct Location &loc, float ofs_north, float ofs_east);
/*
return the distance in meters in North/East plane as a N/E vector
from loc1 to loc2
*/
Vector2f location_diff(const struct Location &loc1, const struct Location &loc2);
/*
return the distance in meters in North/East/Down plane as a N/E/D vector
from loc1 to loc2
*/
Vector3f location_3d_diff_NED(const struct Location &loc1, const struct Location &loc2);
/*
* check if lat and lng match. Ignore altitude and options
*/
bool locations_are_same(const struct Location &loc1, const struct Location &loc2);
/*
* convert invalid waypoint with useful data. return true if location changed
*/
bool location_sanitize(const struct Location &defaultLoc, struct Location &loc);
/*
print a int32_t lat/long in decimal degrees
*/
void print_latlon(AP_HAL::BetterStream *s, int32_t lat_or_lon);
// Converts from WGS84 geodetic coordinates (lat, lon, height)
// into WGS84 Earth Centered, Earth Fixed (ECEF) coordinates
// (X, Y, Z)
void wgsllh2ecef(const Vector3d &llh, Vector3d &ecef);
// Converts from WGS84 Earth Centered, Earth Fixed (ECEF)
// coordinates (X, Y, Z), into WHS84 geodetic
// coordinates (lat, lon, height)
void wgsecef2llh(const Vector3d &ecef, Vector3d &llh);
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// return true when lat and lng are within range
bool check_lat(float lat);
bool check_lng(float lng);
bool check_lat(int32_t lat);
bool check_lng(int32_t lng);
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bool check_latlng(float lat, float lng);
bool check_latlng(int32_t lat, int32_t lng);
bool check_latlng(Location loc);