I'm trying to get some OSM data to overlay correctly over Lidar data. The OSM data according to their wiki is WGS84. The lidar is [EPSG:27700]. So as you can imagine they don't line up/overlay properly as there is a relative warping effect going off.
If I could just acquire the conversion equation to convert WGS84 to EPSG:27700 I can write a small C++ file to parse the OSM files and convert all the lat and lon values.
Anyone know what the conversion calculation is?
I explored vector reprojection of the Osm data in QGIS, and Reprojecting the OSM wgs84 data to epsg 27700. The match the the Lidar is close enough for what I need. Unfortunately it isn't possible to save the change back to the Osm which contains other data I want to retain alongside. If I've understood some the information on this correctly, QGIS uses Proj4 for the reprojection calculations. Attempting to decipher the C++ code to extract the exact calculation used is proving tricky due to the sparse pseudocode comments within it.