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// Example of using the GeographicLib::Geohash class
#include <iostream>
#include <iomanip>
#include <exception>
#include <string>
#include <GeographicLib/Geohash.hpp>
using namespace std;
using namespace GeographicLib;
int main() {
try {
{
// Sample forward calculation
double lat = 57.64911, lon = 10.40744; // Jutland (the wikipedia example)
string geohash;
int maxlen = Geohash::GeohashLength(1.0e-5);
for (int len = 0; len <= maxlen; ++len) {
Geohash::Forward(lat, lon, len, geohash);
cout << len << " " << geohash << "\n";
}
}
{
// Sample reverse calculation
string geohash = "u4pruydqqvj";
double lat, lon, latres, lonres;
cout << fixed;
for (unsigned i = 0; i <= geohash.length(); ++i) {
int len;
Geohash::Reverse(geohash.substr(0, i), lat, lon, len);
latres = Geohash::LatitudeResolution(len);
lonres = Geohash::LongitudeResolution(len);
cout << setprecision(max(0, Geohash::DecimalPrecision(len)))
<< len << " "
<< lat << "+/-" << latres/2 << " "
<< lon << "+/-" << lonres/2 << "\n";
}
}
}
catch (const exception& e) {
cerr << "Caught exception: " << e.what() << "\n";
return 1;
}
}
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