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