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Planimeter.cpp
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/**
* \file Planimeter.cpp
* \brief Command line utility for measuring the area of geodesic polygons
*
* Copyright (c) Charles Karney (2010-2023) <karney@alum.mit.edu> and licensed
* under the MIT/X11 License. For more information, see
* https://geographiclib.sourceforge.io/
*
* See the <a href="Planimeter.1.html">man page</a> for usage information.
**********************************************************************/
#include <iostream>
#include <string>
#include <sstream>
#include <fstream>
#include <GeographicLib/PolygonArea.hpp>
#include <GeographicLib/DMS.hpp>
#include <GeographicLib/Utility.hpp>
#include <GeographicLib/GeoCoords.hpp>
#include <GeographicLib/AuxLatitude.hpp>
#include "Planimeter.usage"
int main(int argc, const char* const argv[]) {
try {
using namespace GeographicLib;
typedef Math::real real;
Utility::set_digits();
enum { GEODESIC, AUTHALIC, RHUMB };
real
a = Constants::WGS84_a(),
f = Constants::WGS84_f();
bool reverse = false, sign = true, polyline = false, longfirst = false,
exact = false, geoconvert_compat = false;
int linetype = GEODESIC;
int prec = 6;
std::string istring, ifile, ofile, cdelim;
char lsep = ';';
for (int m = 1; m < argc; ++m) {
std::string arg(argv[m]);
if (arg == "-r")
reverse = !reverse;
else if (arg == "-s")
sign = !sign;
else if (arg == "-l")
polyline = !polyline;
else if (arg == "-e") {
if (m + 2 >= argc) return usage(1, true);
try {
a = Utility::val<real>(std::string(argv[m + 1]));
f = Utility::fract<real>(std::string(argv[m + 2]));
}
catch (const std::exception& e) {
std::cerr << "Error decoding arguments of -e: " << e.what() << "\n";
return 1;
}
m += 2;
} else if (arg == "-w")
longfirst = !longfirst;
else if (arg == "-p") {
if (++m == argc) return usage(1, true);
try {
prec = Utility::val<int>(std::string(argv[m]));
}
catch (const std::exception&) {
std::cerr << "Precision " << argv[m] << " is not a number\n";
return 1;
}
} else if (arg == "-G")
linetype = GEODESIC;
else if (arg == "-Q")
linetype = AUTHALIC;
else if (arg == "-R")
linetype = RHUMB;
else if (arg == "-E")
exact = true;
else if (arg == "--geoconvert-input")
geoconvert_compat = true;
else if (arg == "--input-string") {
if (++m == argc) return usage(1, true);
istring = argv[m];
} else if (arg == "--input-file") {
if (++m == argc) return usage(1, true);
ifile = argv[m];
} else if (arg == "--output-file") {
if (++m == argc) return usage(1, true);
ofile = argv[m];
} else if (arg == "--line-separator") {
if (++m == argc) return usage(1, true);
if (std::string(argv[m]).size() != 1) {
std::cerr << "Line separator must be a single character\n";
return 1;
}
lsep = argv[m][0];
} else if (arg == "--comment-delimiter") {
if (++m == argc) return usage(1, true);
cdelim = argv[m];
} else if (arg == "--version") {
std::cout << argv[0] << ": GeographicLib version "
<< GEOGRAPHICLIB_VERSION_STRING << "\n";
return 0;
} else
return usage(!(arg == "-h" || arg == "--help"), arg != "--help");
}
if (!ifile.empty() && !istring.empty()) {
std::cerr << "Cannot specify --input-string and --input-file together\n";
return 1;
}
if (ifile == "-") ifile.clear();
std::ifstream infile;
std::istringstream instring;
if (!ifile.empty()) {
infile.open(ifile.c_str());
if (!infile.is_open()) {
std::cerr << "Cannot open " << ifile << " for reading\n";
return 1;
}
} else if (!istring.empty()) {
std::string::size_type m = 0;
while (true) {
m = istring.find(lsep, m);
if (m == std::string::npos)
break;
istring[m] = '\n';
}
instring.str(istring);
}
std::istream* input = !ifile.empty() ? &infile :
(!istring.empty() ? &instring : &std::cin);
std::ofstream outfile;
if (ofile == "-") ofile.clear();
if (!ofile.empty()) {
outfile.open(ofile.c_str());
if (!outfile.is_open()) {
std::cerr << "Cannot open " << ofile << " for writing\n";
return 1;
}
}
std::ostream* output = !ofile.empty() ? &outfile : &std::cout;
// Linetype is one of GEODESIC, AUTHALIC, RHUMB
const AuxLatitude ellip(a, f);
if (linetype == AUTHALIC) {
// adjusting a and f to correspond to the authalic sphere
using std::sqrt;
a = sqrt(ellip.AuthalicRadiusSquared(exact));
f = 0;
}
const Geodesic geod(a, linetype != RHUMB ? f : 0,
exact && linetype != RHUMB);
const Rhumb rhumb(a, linetype == RHUMB ? f : 0,
exact && linetype == RHUMB);
PolygonArea poly(geod, polyline);
PolygonAreaRhumb polyr(rhumb, polyline);
GeoCoords p;
// Max precision = 10: 0.1 nm in distance, 10^-15 deg (= 0.11 nm),
// 10^-11 sec (= 0.3 nm).
prec = std::min(10 + Math::extra_digits(), std::max(0, prec));
std::string s, eol("\n");
real perimeter, area;
unsigned num;
std::istringstream str;
std::string slat, slon, junk;
real lat = 0, lon = 0;
while (std::getline(*input, s)) {
if (!cdelim.empty()) {
std::string::size_type m = s.find(cdelim);
if (m != std::string::npos) {
eol = " " + s.substr(m) + "\n";
s = s.substr(0, m);
}
}
bool endpoly = s.empty();
if (!endpoly) {
try {
using std::isnan;
if (geoconvert_compat) {
p.Reset(s, true, longfirst);
lat = p.Latitude(); lon = p.Longitude();
} else {
str.clear(); str.str(s);
if (!(str >> slat >> slon))
throw GeographicErr("incomplete input");
if (str >> junk)
throw GeographicErr("extra input");
DMS::DecodeLatLon(slat, slon, lat, lon, longfirst);
}
if (isnan(lat) || isnan(lon))
endpoly = true;
}
catch (const GeographicErr&) {
endpoly = true;
}
}
if (endpoly) {
num =
linetype == RHUMB ? polyr.Compute(reverse, sign, perimeter, area) :
poly.Compute(reverse, sign, perimeter, area); // geodesic + authalic
if (num > 0) {
*output << num << " " << Utility::str(perimeter, prec);
if (!polyline) {
*output << " " << Utility::str(area, std::max(0, prec - 5));
}
*output << eol;
}
linetype == RHUMB ? polyr.Clear() : poly.Clear();
eol = "\n";
} else {
linetype == RHUMB ? polyr.AddPoint(lat, lon) :
poly.AddPoint
(linetype == AUTHALIC ?
ellip.Convert(AuxLatitude::PHI, AuxLatitude::XI, lat, exact) : lat,
lon);
}
}
num =
linetype == RHUMB ? polyr.Compute(reverse, sign, perimeter, area) :
poly.Compute(reverse, sign, perimeter, area);
if (num > 0) {
*output << num << " " << Utility::str(perimeter, prec);
if (!polyline) {
*output << " " << Utility::str(area, std::max(0, prec - 5));
}
*output << eol;
}
linetype == RHUMB ? polyr.Clear() : poly.Clear();
eol = "\n";
return 0;
}
catch (const std::exception& e) {
std::cerr << "Caught exception: " << e.what() << "\n";
return 1;
}
catch (...) {
std::cerr << "Caught unknown exception\n";
return 1;
}
}
AuxLatitude.hpp
Header for the GeographicLib::AuxLatitude class.
DMS.hpp
Header for GeographicLib::DMS class.
GeoCoords.hpp
Header for GeographicLib::GeoCoords class.
real
GeographicLib::Math::real real
Definition GeodSolve.cpp:28
main
int main(int argc, const char *const argv[])
Definition Planimeter.cpp:24
PolygonArea.hpp
Header for GeographicLib::PolygonAreaT class.
Utility.hpp
Header for GeographicLib::Utility class.
GeographicLib::AuxLatitude
Conversions between auxiliary latitudes.
Definition AuxLatitude.hpp:75
GeographicLib::AuxLatitude::Convert
AuxAngle Convert(int auxin, int auxout, const AuxAngle &zeta, bool exact=false) const
Definition AuxLatitude.cpp:297
GeographicLib::AuxLatitude::AuthalicRadiusSquared
Math::real AuthalicRadiusSquared(bool exact=false) const
Definition AuxLatitude.cpp:352
GeographicLib::GeoCoords
Conversion between geographic coordinates.
Definition GeoCoords.hpp:49
GeographicLib::GeoCoords::Reset
void Reset(const std::string &s, bool centerp=true, bool longfirst=false)
Definition GeoCoords.cpp:19
GeographicLib::GeoCoords::Latitude
Math::real Latitude() const
Definition GeoCoords.hpp:276
GeographicLib::GeoCoords::Longitude
Math::real Longitude() const
Definition GeoCoords.hpp:281
GeographicLib::Geodesic
Geodesic calculations
Definition Geodesic.hpp:175
GeographicLib::GeographicErr
Exception handling for GeographicLib.
Definition Constants.hpp:316
GeographicLib::Math::real
double real
Definition Math.hpp:110
GeographicLib::Rhumb
Solve of the direct and inverse rhumb problems.
Definition Rhumb.hpp:79
GeographicLib
Namespace for GeographicLib.
Definition Accumulator.cpp:12