ossim_int32 ossimUtmProjection::computeZone(const ossimGpt& ground)
{
ossim_int32 result = 0;
double longitude = ground.lonr();
double lat_Degrees = (ossim_int32)( (ground.latd()) + 0.00000005);
double long_Degrees = (ossim_int32)( (ground.lond()) + 0.00000005);
if (longitude < M_PI)
result = (ossim_int32)( (31 + ((180 * longitude) / (6 * M_PI)) ) + 0.00000005);
else
result = (ossim_int32)( (((180 * longitude) / (6 * M_PI)) - 29) + 0.00000005);
if (result > 60)
result = 1;
/* UTM special cases */
if ((lat_Degrees > 55) && (lat_Degrees < 64) && (long_Degrees > -1)
&& (long_Degrees < 3))
result = 31;
if ((lat_Degrees > 55) && (lat_Degrees < 64) && (long_Degrees > 2)
&& (long_Degrees < 12))
result = 32;
if ((lat_Degrees > 71) && (long_Degrees > -1) && (long_Degrees < 9))
result = 31;
if ((lat_Degrees > 71) && (long_Degrees > 8) && (long_Degrees < 21))
result = 33;
if ((lat_Degrees > 71) && (long_Degrees > 20) && (long_Degrees < 33))
result = 35;
if ((lat_Degrees > 71) && (long_Degrees > 32) && (long_Degrees < 42))
result = 37;
return result;
}
ossimGpt ossimThreeParamDatum::shiftToWgs84(const ossimGpt &aPt)const
{
if(ossim::almostEqual(param1(), 0.0)&&
ossim::almostEqual(param2(), 0.0)&&
ossim::almostEqual(param3(), 0.0))
{
return ossimGpt(aPt.latd(),
aPt.lond(),
aPt.latd(),
ossimGpt().datum());
}
ossimEcefPoint p1 = aPt;
ossimEcefPoint p2;
if(withinMolodenskyRange(aPt.latd()))
{
ossimWgs84Datum wgs84;
double latin, lonin, hgtin;
double latout, lonout, hgtout;
double da = wgs84.ellipsoid()->getA() - ellipsoid()->getA();
double df = wgs84.ellipsoid()->getFlattening() - ellipsoid()->getFlattening();
latin = aPt.latr();
lonin = aPt.lonr();
hgtin = aPt.height();
if(aPt.isHgtNan())
{
hgtin = 0.0;
}
molodenskyShift(ellipsoid()->getA(), da, ellipsoid()->getFlattening(), df, param1(), param2(), param3(),
latin, lonin, hgtin,
latout, lonout, hgtout);
ossimGpt g;
g.latr(latout);
g.lonr(lonout);
g.height(hgtout);
g.datum(this);
return g;
}
else
{
p2 = ossimEcefPoint(p1.x() + theParam1,
p1.y() + theParam2,
p1.z() + theParam3);
}
return ossimGpt(p2); // defaults to WGS84
}
