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https://github.com/tumic0/GPXSee.git
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Added support for Mercator projection (the real one)
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@ -127,7 +127,8 @@ HEADERS += src/config.h \
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src/data/nmeaparser.h \
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src/data/oziparsers.h \
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src/map/rectd.h \
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src/map/geocentric.h
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src/map/geocentric.h \
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src/map/mercator.h
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SOURCES += src/main.cpp \
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src/common/coordinates.cpp \
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src/common/rectc.cpp \
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@ -222,7 +223,8 @@ SOURCES += src/main.cpp \
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src/data/igcparser.cpp \
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src/data/nmeaparser.cpp \
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src/data/oziparsers.cpp \
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src/map/geocentric.cpp
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src/map/geocentric.cpp \
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src/map/mercator.cpp
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RESOURCES += gpxsee.qrc
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TRANSLATIONS = lang/gpxsee_cs.ts \
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lang/gpxsee_sv.ts \
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@ -36,6 +36,8 @@
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#define ProjFalseOriginLatGeoKey 3085
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#define ProjCenterLongGeoKey 3088
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#define ProjCenterLatGeoKey 3089
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#define ProjCenterEastingGeoKey 3090
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#define ProjFalseOriginNorthingGeoKey 3091
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#define ProjScaleAtNatOriginGeoKey 3092
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#define ProjScaleAtCenterGeoKey 3093
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#define ProjAzimuthAngleGeoKey 3094
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@ -253,6 +255,8 @@ bool GeoTIFF::readKeys(TIFFFile &file, Ctx &ctx, QMap<quint16, Value> &kv) const
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case ProjAzimuthAngleGeoKey:
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case ProjRectifiedGridAngleGeoKey:
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case ProjFalseOriginLatGeoKey:
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case ProjCenterEastingGeoKey:
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case ProjFalseOriginNorthingGeoKey:
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if (!readGeoValue(file, ctx.values, entry.ValueOffset,
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value.DOUBLE))
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return false;
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@ -327,7 +331,7 @@ Projection::Method GeoTIFF::method(QMap<quint16, Value> &kv)
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case CT_ObliqueMercator:
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return Projection::Method(9815);
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case CT_Mercator:
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return Projection::Method(1024);
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return Projection::Method(9804);
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case CT_LambertConfConic_2SP:
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return Projection::Method(9802);
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case CT_LambertConfConic_1SP:
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@ -421,10 +425,14 @@ bool GeoTIFF::projectedModel(QMap<quint16, Value> &kv)
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sp2 = NAN;
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if (kv.contains(ProjFalseNorthingGeoKey))
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fn = lu.toMeters(kv.value(ProjFalseNorthingGeoKey).DOUBLE);
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else if (kv.contains(ProjFalseOriginNorthingGeoKey))
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fn = lu.toMeters(kv.value(ProjFalseOriginNorthingGeoKey).DOUBLE);
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else
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fn = NAN;
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if (kv.contains(ProjFalseEastingGeoKey))
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fe = lu.toMeters(kv.value(ProjFalseEastingGeoKey).DOUBLE);
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else if (kv.contains(ProjCenterEastingGeoKey))
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fe = lu.toMeters(kv.value(ProjCenterEastingGeoKey).DOUBLE);
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else
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fe = NAN;
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122
src/map/mercator.cpp
Normal file
122
src/map/mercator.cpp
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@ -0,0 +1,122 @@
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/*
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* Based on libgeotrans with the following Source Code Disclaimer:
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1. The GEOTRANS source code ("the software") is provided free of charge by
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the National Imagery and Mapping Agency (NIMA) of the United States
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Department of Defense. Although NIMA makes no copyright claim under Title 17
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U.S.C., NIMA claims copyrights in the source code under other legal regimes.
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NIMA hereby grants to each user of the software a license to use and
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distribute the software, and develop derivative works.
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2. Warranty Disclaimer: The software was developed to meet only the internal
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requirements of the U.S. National Imagery and Mapping Agency. The software
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is provided "as is," and no warranty, express or implied, including but not
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limited to the implied warranties of merchantability and fitness for
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particular purpose or arising by statute or otherwise in law or from a
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course of dealing or usage in trade, is made by NIMA as to the accuracy and
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functioning of the software.
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3. NIMA and its personnel are not required to provide technical support or
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general assistance with respect to the software.
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4. Neither NIMA nor its personnel will be liable for any claims, losses, or
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damages arising from or connected with the use of the software. The user
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agrees to hold harmless the United States National Imagery and Mapping
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Agency. The user's sole and exclusive remedy is to stop using the software.
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5. NIMA requests that products developed using the software credit the
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source of the software with the following statement, "The product was
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developed using GEOTRANS, a product of the National Imagery and Mapping
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Agency and U.S. Army Engineering Research and Development Center."
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6. For any products developed using the software, NIMA requires a disclaimer
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that use of the software does not indicate endorsement or approval of the
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product by the Secretary of Defense or the National Imagery and Mapping
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Agency. Pursuant to the United States Code, 10 U.S.C. Sec. 2797, the name of
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the National Imagery and Mapping Agency, the initials "NIMA", the seal of
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the National Imagery and Mapping Agency, or any colorable imitation thereof
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shall not be used to imply approval, endorsement, or authorization of a
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product without prior written permission from United States Secretary of
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Defense.
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*/
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#include "ellipsoid.h"
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#include "mercator.h"
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Mercator::Mercator(const Ellipsoid *ellipsoid, double latitudeOrigin,
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double longitudeOrigin, double falseEasting, double falseNorthing)
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{
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double es2;
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double es3;
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double es4;
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double sin_olat;
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_a = ellipsoid->radius();
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_latitudeOrigin = deg2rad(latitudeOrigin);
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_longitudeOrigin = deg2rad(longitudeOrigin);
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if (_longitudeOrigin > M_PI)
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_longitudeOrigin -= 2*M_PI;
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_falseNorthing = falseNorthing;
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_falseEasting = falseEasting;
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_es = 2 * ellipsoid->flattening() - ellipsoid->flattening()
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* ellipsoid->flattening();
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_e = sqrt(_es);
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sin_olat = sin(_latitudeOrigin);
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_scaleFactor = 1.0 / (sqrt(1.e0 - _es * sin_olat * sin_olat)
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/ cos(_latitudeOrigin));
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es2 = _es * _es;
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es3 = es2 * _es;
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es4 = es3 * _es;
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_ab = _es / 2.e0 + 5.e0 * es2 / 24.e0 + es3 / 12.e0 + 13.e0 * es4 / 360.e0;
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_bb = 7.e0 * es2 / 48.e0 + 29.e0 * es3 / 240.e0 + 811.e0 * es4 / 11520.e0;
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_cb = 7.e0 * es3 / 120.e0 + 81.e0 * es4 / 1120.e0;
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_db = 4279.e0 * es4 / 161280.e0;
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}
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PointD Mercator::ll2xy(const Coordinates &c) const
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{
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double lon = deg2rad(c.lon());
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double lat = deg2rad(c.lat());
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double ctanz2;
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double e_x_sinlat;
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double delta_lon;
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double tan_temp;
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double pow_temp;
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if (lon > M_PI)
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lon -= 2*M_PI;
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e_x_sinlat = _e * sin(lat);
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tan_temp = tan(M_PI / 4.e0 + lat / 2.e0);
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pow_temp = pow((1.e0 - e_x_sinlat) / (1.e0 + e_x_sinlat), _e / 2.e0);
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ctanz2 = tan_temp * pow_temp;
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delta_lon = lon - _longitudeOrigin;
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if (delta_lon > M_PI)
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delta_lon -= 2 * M_PI;
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if (delta_lon < -M_PI)
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delta_lon += 2 * M_PI;
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return PointD(_scaleFactor * _a * delta_lon + _falseEasting,
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_scaleFactor * _a * log(ctanz2) + _falseNorthing);
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}
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Coordinates Mercator::xy2ll(const PointD &p) const
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{
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double dx;
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double dy;
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double xphi;
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double lat, lon;
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dy = p.y() - _falseNorthing;
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dx = p.x() - _falseEasting;
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lon = _longitudeOrigin + dx / (_scaleFactor * _a);
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xphi = M_PI / 2.e0 - 2.e0 * atan(1.e0 / exp(dy / (_scaleFactor * _a)));
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lat = xphi + _ab * sin(2.e0 * xphi) + _bb * sin(4.e0 * xphi)
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+ _cb * sin(6.e0 * xphi) + _db * sin(8.e0 * xphi);
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if (lon > M_PI)
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lon -= 2 * M_PI;
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if (lon < -M_PI)
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lon += 2 * M_PI;
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return Coordinates(rad2deg(lon), rad2deg(lat));
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}
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29
src/map/mercator.h
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29
src/map/mercator.h
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@ -0,0 +1,29 @@
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#ifndef MERCATOR_H
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#define MERCATOR_H
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#include "ct.h"
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class Ellipsoid;
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class Mercator : public CT
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{
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public:
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Mercator(const Ellipsoid *ellipsoid, double latitudeOrigin,
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double longitudeOrigin, double falseEasting, double falseNorthing);
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virtual CT *clone() const {return new Mercator(*this);}
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virtual PointD ll2xy(const Coordinates &c) const;
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virtual Coordinates xy2ll(const PointD &p) const;
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private:
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double _a, _es, _e;
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double _latitudeOrigin;
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double _longitudeOrigin;
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double _falseNorthing;
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double _falseEasting;
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double _scaleFactor;
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double _ab, _bb, _cb, _db;
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};
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#endif // MERCATOR_H
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@ -1,4 +1,5 @@
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#include "datum.h"
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#include "mercator.h"
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#include "webmercator.h"
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#include "transversemercator.h"
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#include "lambertconic.h"
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@ -16,11 +17,11 @@ Projection::Method::Method(int id)
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case 1024:
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case 9801:
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case 9802:
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case 9804:
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case 9807:
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case 9815:
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case 9820:
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case 9822:
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case 9841:
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_id = id;
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break;
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default:
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@ -36,7 +37,6 @@ Projection::Projection(const PCS *pcs) : _gcs(pcs->gcs()), _units(pcs->units()),
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switch (pcs->method().id()) {
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case 1024:
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case 9841:
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_ct = new WebMercator();
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break;
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case 9801:
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@ -51,6 +51,11 @@ Projection::Projection(const PCS *pcs) : _gcs(pcs->gcs()), _units(pcs->units()),
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setup.longitudeOrigin(), setup.falseEasting(),
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setup.falseNorthing());
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break;
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case 9804:
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_ct = new Mercator(ellipsoid, setup.latitudeOrigin(),
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setup.longitudeOrigin(), setup.falseEasting(),
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setup.falseNorthing());
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break;
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case 9807:
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_ct = new TransverseMercator(ellipsoid, setup.latitudeOrigin(),
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setup.longitudeOrigin(), setup.scale(), setup.falseEasting(),
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