convert lat/lon into meters

I have a database of latitude, longitude and radius in the following form:

48180759,11518950,19.0

Both latitude and longitude are expressed in degrees but then multiplied by 1e6 (or 1000000). Radius, on the other hand, are expressed in meters. What I am trying to do is convert lat/lon into meters so that I can use geometric functions more accurately, especially the one that looks for intersects (overlaps between points). Any ideas?