Hi all,
I would like to transform local cartesian coordinates into longitude and
latitude. According to all the documentation I could find, I tried doing
this (in C++, specifying a center for the orthographic projection at 56 N
15 E):
projPJ cSourceProjection = pj_init_plus("+proj=ortho +ellps=WGS84
+datum=WGS84 +lat_0=56 +lon_0=15 +no_defs");
projPJ cTargetProjection = pj_init_plus("+proj=longlat +ellps=WGS84
+datum=WGS84 +no_defs");
projXY pt;
// 1
pt.u = 0; pt.v = 0;
pj_transform( cSourceProjection, cTargetProjection, 1, 0, &pt.u, &pt.v, 0
);
printf ("Result 1: %2.6f %2.6f", pt.u, pt.v);
// 2
pt.u = 0; pt.v = 111120;
pj_transform( cSourceProjection, cTargetProjection, 1, 0, &pt.u, &pt.v, 0
);
printf ("Result 2: %2.6f %2.6f", pt.u, pt.v);
--> Delivers :
Result 1: 0.26180 0.97738
Result 2: 0.29295 0.97716
However, I would like to get something like
"Result 1: 56.0.. 15.0.." (i.e. the projection center itself, no matter
what scaling there might be) and
"Result 2: 57.0.. 15.." (if pt is interpreted in meters)
- at least anything that resembles reasonable longitude and latitude
values, but I don't...
Could you maybe give me a hint what is going wrong here?
Thank you in advance for any help!
Regards
Niels
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