General purpose transformation library with focus on cartographic projections.
Right now not many transforms exist, but eventually the library will grow on as needed basis.
The library is based on backends which can be switched around, not all backends support all transforms, and certain backends expect to have certain things defined inside transforms. Everything is validated statically at compile time.
#include "transform.hpp"
int main() {
using namespace transform;
using namespace transform::backends;
using namespace transform::transforms;
// ...
transformer<cpu> t;
t.run(scale(10.0),
x_in, y_in, x_out, y_out);
}
Checkout out the examples directory for more fun stuff.
We intend to develop a performant transform library. Presently the benchmarks for WGS84 latlong->tmerc stand as:
# count(mil) proj mproj cpu mcpu cCL gCL
1 10 482 141 355 79 195 310
2 20 962 284 711 155 359 548
3 30 1485 474 1092 226 557 811
4 40 1999 578 1422 303 737 1036
5 50 2411 734 1788 377 937 1289
All times are in milliseconds.
mproj: Multi-threaded proj backend
cCL : CPU device OpenCL
gCL : GPU device OpenCL
For multi-threaded backends, the transforms run at full concurrency where the workload is divided among available hardware threads, as reported by std::thread::hardware_concurrency()