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Centroid calculation for alert distance

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This commit is contained in:
Dan Paulat 2022-10-15 09:43:47 -05:00
parent a3d007d8c4
commit 5784abc117
3 changed files with 91 additions and 19 deletions
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39
wxdata/source/scwx/common/geographic.cpp
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@ -2,6 +2,7 @@
#include <scwx/common/characters.hpp>
#include <format>
#include <numbers>
namespace scwx
{
@ -12,6 +13,44 @@ static std::string GetDegreeString(double degrees,
DegreeStringType type,
const std::string& suffix);
Coordinate GetCentroid(const std::vector<Coordinate>& coordinates)
{
double x = 0.0;
double y = 0.0;
double z = 0.0;
for (const Coordinate& c : coordinates)
{
// Convert latitude and longitude to radians
double latitudeRadians = c.latitude_ * std::numbers::pi / 180.0;
double longitudeRadians = c.longitude_ * std::numbers::pi / 180.0;
// Convert latitude and longitude to Cartesian coordinates
double x1 = std::cos(latitudeRadians) * std::cos(longitudeRadians);
double y1 = std::cos(latitudeRadians) * std::sin(longitudeRadians);
double z1 = std::sin(latitudeRadians);
// Combine with accumulators
x += x1;
y += y1;
z += z1;
}
// Compute averages
x /= coordinates.size();
y /= coordinates.size();
z /= coordinates.size();
// Convert Cartesian coordinates back to latitude and longitude
double hyp = std::sqrt(x * x + y * y);
double latitudeRadians = std::atan2(z, hyp);
double longitudeRadians = std::atan2(y, x);
// Return latitude and longitude in degrees
return {latitudeRadians * 180.0 / std::numbers::pi,
longitudeRadians * 180.0 / std::numbers::pi};
}
std::string GetLatitudeString(double latitude, DegreeStringType type)
{
std::string suffix {};